On April 8thand 9th, 1999, an outbreak of severe thunderstorms and tornadoes occured across the Lower Missouri, Mid Mississippi and Lower Ohio Valleys. The outbreak itself was well forecast, with a HIGH risk of severe thunderstorms placed over parts of the Lower Missouri and Mid Mississippi Valleys during the afternoon and evening of April 8th. Within the area of Iowa, northern Missouri and west-central Illinois, several supercell thunderstorms developed, with a few long track tornadoes. Other weaker tornadoes developed undeneath the mid/upper level low over eastern Nebraska. During the entire event, there was 54 tornadoes, around 65 reports of severe thunderstorm hail and around 110 reports of severe thunderstorm wind gusts.
There was three F4 rated tornadoes (two long track tornadoes in southwest and central Iowa with another just northeast of Cincinnati, OH), five F3, eight F2, twenty-four F1 and thirteen F0 tornadoes. All severe reports here exclude a minor hail event over central California and severe weather produced by a supercell along the Georgia/South Carolina border.
There was 6 fatalities and 115 injuries related to the outbreak, with 4 tornado related fatalities in the Cincinnati, Ohio area.
The most notable and studied part of this outbreak takes place over the Lower Ohio Valley. Severe supercells that moved across Missouri and Illinois on the evening of April 8th consolidated into a broken squalline of thunderstorms. These storms would progress eastward through Indiana and Kentucky overnight with occasional wind, hail and tornado reports. Many tornado watches were issued over the Lower Missouri and Mid Mississippi Valley earlier in the evening (with a few PDS tornado watches). Tornado watch number 140 was issued for a large part of Indiana and northwest Kentucky, with Tornado watch number 141 following just before 3 AM EDT April 9th, that covered much of west and central Ohio, north Kentucky and a small part of western West Virginia. The broken squalline of thunderstorms over Indiana began to break down into individual cells over central and southern Indiana by around 3 AM EDT on April 9th. Once cell is particular over south-central Indiana would produce several tornadoes across southeast Indiana and southwest Ohio between 4 and 5:30 AM. Another cell would produce a few tornadoes across west-central Ohio.
The first tornado in southeast Indiana occured at 4:05 AM EDT and stretched from 6 miles southwest of Rexville to Olean (4:22 AM EDT, Ripley County). This tornado moved into Jefferson Proving Grounds from Jennings County. Trees were knocked town, garages destroyed, a barn blown over, a truck thrown 30 yard and a mobile home destroyed. This tornado was rated F3 with $700,000 of damage. There was no fatalities or injuries.
A second tornado, rated F0, moved from 2 miles West of Aurora (4:44 AM EDT) to 1 mile west of Aurora, Indiana (4:47 AM EDT Dearborn County), A small barn was totally destroyed, a 40 foot silo was damaged and several trees were downed. Several homes were heavily damaged in rural Dillsboro. $250,000 of damage resulted, with no fatalities or injuries.
A third tornado, rated F1, moved from 1 mile West of Addyston (4:55 AM EDT) to Addyston, Ohio (5:00 AM EDT, Hamilton County). After touching down on the north shore of the Ohio River, this tornado destroyed a house, pulled metal roofing from a garage, and downed several trees. There was $200,000 of damage.
A forth tornado, rated F4, moved from Blue Ash (5:12 AM EDT, Hamilton County, Ohio) to 1 mile southwest of Maineville(5:25 AM EDT, Warren County, Ohio). The tornado began with F2 intensity in the Blue Ash area. The tornado moved through Montgomery, Symmes Township, and Loveland before entering Warren County. From here, it moved through southeast Deerfield Township and across the Little Miami River. The intensity was F2 to F3 along many points of its track, intensifying to a low F4 while in Montgomery. The width ranged from 100 yeards to 1/4 mile. Four fatalities occurred, with twi in a home and another two in vehicles. About 91 homes and apartments were destroyed along with 37 businesses. Additionally, 197 homes and apartments suffered major damage with 477 others also incurring damage. Twenty six businesses had major damage with 18 others alos incurring damage. In Warren County, the tornado damaged several houses, hundreds of mature trees along with garages and barns. There was a total of $85 million of damage resulting from this tornado.
The fifth and final tornado rated F2, moved from 3 miles northeast of Maineville (5:33 AM EDT) to 3 miles southwest of Morrow, Ohio (5:40 AM EDT, Warren County). This tornado touched down in eastern Hamilton Township causing heavy damage to a farmestead. The roof of the house and an extension to a barn were destroyed. Further down the path, a house was skewed from its foundation. There was $2.5 million of damage resulting from this tornado.
It should be noted that the intensity of the thunderstorms over southeast Indiana and southwest Ohio were somewhat unanticipated early on April 9th. A great deal of study was made of this event, and findings can be found at this link: http://205.156.54.206/er/iln/sls4999gt.html
I personally still remember this event very well. I had been looking over the 72 hour Aviation model output on April 6th and even then thought that severe weather was quite possible across the Mid MS Valley. The area and threats weren't defined til later on the 7th and early on the 8th. There was some doubt early in the day as to how far south thunderstorms would develop along a dryline (storms did in fact form southward to the Arklatex region). This storm had plenty of low level moisture to work with, along with very strong low level shear. The storms closest to the upper low moved north-northeast over northern Missouri and Iowa, while storms farther east moved east-northeast. The storm that produced the Cincinnati tornadoes actually developed in southeast Missouri, tracked east-northeast with little to no severe weather til it entered southeast Indiana. Evening soundings from Lincoln, IL and Wilmington, OH pointed out the potential for severe weather in the Cincinnati area later that night, but with the storms arriving late (after 3 AM), I wasn't expecting a great tornado threat. Typically, you see decreasing low level instability (something you need for upward moving air parcels and storms) that late at night. I recall tracking the Indiana and Illinois storms all night. One cell over south-central Indiana took my attention around 3 AM as it showed some storm-scale rotation on the Indianapolis WSR-88D radar. A tornado warning was soon issued for Jennings County as the rotation strengthened, then producing the tornado in Ripley County. The base reflectivity signatures that the Indianpolis and Wilmington radars displayed didn't show the usual signatures for tornadic activity. It wasn't til the storm entered Hamilton County and began to "spin-up" that supercell characteristics began to show. By this time I was ready to head for the basement with the low level circulation only passing a few miles to the south. I never heard any reports of tornadoes, except what was in the tornado warnings. I did watch some pictures of damage in northeast Hamilton County on the early morning news before going to bed (6:30 AM).
Tornadoes of April 8-9, 1999
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Tornadoes of April 8-9, 1999
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Here's some important bulletins from this event: (I forgot to mention that much of the Lower Ohio Valley was under a MODERATE risk of severe thunderstorms)
ZCZC MKCSWODY1 000
ACUS1 KMKC 090056
MKC AC 090056
CONVECTIVE OUTLOOK...REF AFOS NMCGPH94O.
VALID 090100Z - 091200Z
REF WW NUMBER 0135...VALID TIL 0200Z
REF WW NUMBER 0136...VALID TIL 0200Z
REF WW NUMBER 0137...VALID TIL 0300Z
REF WW NUMBER 0138...VALID TIL 0600Z
THERE IS A HIGH RISK OF SVR TSTMS UNTIL AROUND 06Z OVER EXTREME
SOUTHEAST IOWA...CENTRAL ILLINOIS...AND EAST CENTRAL MISSOURI TO
THE RIGHT OF A LINE FROM 10 NNW VIH 15 E JEF 45 SSW UIN 25 NNW UIN
25 WNW BRL 25 SSW CID 25 E CID 20 ENE MLI 45 ENE BMI DNV 15 NW HUF
40 SSE MTO 25 ESE BLV 20 E VIH 10 NNW VIH.
SURROUNDING THE HIGH RISK...THERE IS A MDT RISK OF SVR TSTMS
OVERNIGHT FOR MUCH OF THE REMAINDER OF ILLINIOS...A LARGE PART OF
INDIANA...SOUTHWEST OHIO...NORTH CENTRAL KENTUCKY...AND A PART OF
SOUTHEAST MISSOURI. THE MDT RISK IS TO THE RIGHT OF A LINE FROM
30 SSE TBN 10 WNW TBN 20 ENE JEF 20 NNW UIN 35 S CID CID
30 WSW DBQ 25 SSE RFD 50 WSW SBN 25 S FWA 15 S DAY 25 SSE LUK
30 W LEX 45 E OWB 35 WSW EVV 10 SSW MDH 50 N P02 30 SSE TBN.
SURROUNDING THE HIGH AND MDT RISKS...THERE IS A SLGT RISK OF SVR
TSTMS TO THE RIGHT OF A LINE FROM 65 N GLH 30 E TXK 35 NW TYR 15
SSE DAL 10 WSW DAL 20 WNW PRX 20 WSW FSM 25 ENE FYV 15 WNW TBN 35
SW UIN 20 NNW UIN 40 S CID 20 NNE OTM 30 SW DSM 35 ESE LNK 15 NNW
BIE 30 WSW OLU OFK 10 E SUX 25 WSW MCW 35 SSE LSE 20 E MKE 15 SW
JXN 35 NW MFD 25 W ZZV 20 E 5I3 10 E TYS 35 ENE CHA 35 W RMG 35 ENE
TUP 65 N GLH.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 SSE SAV 25 W AGS
40 NNE ATL 30 W RMG 65 NNE GLH 20 ESE TXK 30 NNW TYR 15 SSE DAL
10 WSW DAL 20 WNW PRX 15 SSE FYV 10 NW TBN 40 SSW UIN 25 NNW UIN
25 ESE OTM 25 W 3OI 15 SW BIE GRI 45 E BUB 10 E YKN 20 ENE FRM VOK
45 NW MKG 20 W FNT MTC ...CONT... 35 ENE CLE 20 W MGW 10 NE ROA
10 WNW SOP MYR.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 45 NW UKI RBL
75 NE SVE 60 NW OWY 30 S SUN 15 SSW PIH 30 WNW EVW 20 S SLC
30 WNW MLF 45 WNW P38 55 WSW DRA 25 ENE BFL 40 ESE PRB 30 WSW PRB.
...SEVERE THUNDERSTORM FORECAST DISCUSSION...
...MIDDLE MISSISSIPPI AND LOWER OHIO RIVER VALLEYS...
ONGOING TORNADO OUTBREAK SHOULD CONTINUE THROUGH THE LATE EVENING
HOURS AS STRONG MID/UPPER JET STREAK SURGES ACROSS THE WARM SECTOR.
SURFACE DEWPOINTS IN THE MIDDLE 60S F EXTEND ACROSS CENTRAL
ILLINOIS...SOUTHERN INDIANA...AND SOUTHWEST OHIO SOUTH OF THE WARM
FRONT. 00Z ILX SOUNDING HAD IMPRESSIVE CURVED HODOGRAPH WITH 0-3
KM STORM RELATIVE HELICITY IN EXCESS OF 500 M2/S2 AND BRN SHEAR OF
132 M2/S2. IN ADDITION...ILN SOUNDING INDICATED THAT STEEP MID
LEVEL LAPSE RATES AROUND 7.5 C/KM ARE IN PLACE WELL DOWNSTREAM OF
CURRENT ACTIVITY.
TORNADO THREAT SHOULD GRADUALLY DIMINISH LATER THIS EVENING AS
BOUNDARY LAYER LAPSE RATES WEAKEN DUE TO LOSS OF INSOLATION.
HOWEVER...POTENTIAL FOR SEVERE SQUALL LINE RACING EAST WITH
WIDESPREAD WIND DAMAGE APPEARS RATHER HIGH GIVEN STRENGTH OF MID
LEVEL FLOW WITH 500 MB SPEED OF 80 KNOTS OBSERVED AT SGF.
...NORTHEAST TEXAS TO TENNESSEE...
CAPPING INVERSION IS RATHER STRONG PER 00Z SOUNDINGS AT LZK AND
SHV...WITH OBSERVED CONVECTIVE INHIBITIONS OF -90 TO -190 J/KG.
HOWEVER...SUFFICIENT LOW LEVEL CONVERGENCE ALONG ADVANCING COLD
FRONT/DRYLINE HAS INITIATED ISOLATED THUNDERSTORMS IN THE DALLAS
AREA. IN ADDITION...SQUALL LINE ON TAIL OF OUTBREAK EXTENDS INTO
NORTHWEST ARKANSAS. 18Z ETA INDICATED A 300 MB VORTICITY MAXIMUM
MOVING ACROSS OKLAHOMA AND INTO ARKANSAS DURING THE EVENING...WITH
A RATHER STRONG COUPLET OF POSITIVE/NEGATIVE LOW LEVEL THETA-E
ADVECTION SHOWN WITH ADVANCING FRONT.
THUS...SUFFICIENT UVVS ARE ANTICIPATED TO CONTINUE BREAKING CAPPING
INVERSION AS FRONT ADVANCES TOWARD MISSISSIPPI RIVER AND EVENTUALLY
TENNESSEE DURING THE NIGHT.
...EASTERN NEBRASKA INTO IOWA...
WELL DEFINED SPIRAL OF SHOWERS/THUNDERSTORMS BENEATH THE UPPER LOW
SHOULD GRADUALLY WEAKEN DURING THE EVENING WITH LOSS OF DIURNAL
HEATING. HOWEVER...ISOLATED MARGINALLY SEVERE THUNDERSTORMS WITH
HAIL WILL REMAIN POSSIBLE UNTIL ABOUT 04Z AS THE VORTICITY MAXIMUM
ROTATES ACROSS IOWA.
..CRAVEN.. 04/09/99
NNNN
ZCZC MKCSEL1 ALL 091200;372,0850 404,0844 404,0815 372,0821;
WWUS9 KMKC 090648
MKC WW 090648
OHZ000-KYZ000-WVZ000-091200-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 141
STORM PREDICTION CENTER NORMAN OK
248 AM EDT FRI APR 9 1999
THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN AND SOUTHERN OHIO
NORTHERN AND EASTERN KENTUCKY
FAR WESTERN WEST VIRGINIA
EFFECTIVE THIS FRIDAY MORNING FROM 300 AM UNTIL 800 AM EDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO
60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES WEST SOUTHWEST OF JACKSON KENTUCKY TO 55
MILES NORTH NORTHWEST OF COLUMBUS OHIO.
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION... CONTINUE...WW 140...
DISCUSSION...STRONG VERTICAL SHEAR /50 KT SW FLOW AT 850 MB VEERING
TO 70 KT WSW FLOW AT 500 MB/...AND PERSISTENT PRESSURE FALL AXIS
ALONG AND S OF E/W ORIENTED STATIONARY FRONT OVER CENTRAL OH
SUGGEST CONTINUED THREAT FOR ISOLATED TORNADOES DESPITE UNFAVORABLE
TIME OF DAY AS IND CONVECTION CONTINUES EWD. OTHER STORMS MAY FORM
INVOF SHALLOW N/S WARM FRONT NOW EXTENDING FROM NEAR DAY TO NEAR
JKL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 480.
MEAN STORM MOTION VECTOR 27050.
...CORFIDI
;372,0850 404,0844 404,0815 372,0821;
NNNN
ZCZC MKCWWAMKC ALL 091200;372,0850 404,0844 404,0815 372,0821;
WWUS8 KMKC 090852
MKC WW-A 090852
OHZ000-KYZ000-091100-
STATUS REPORT ON WW NUMBER 141
CONTINUE WW.
SCATTERED STRONG TO SEVERE THUNDERSTORMS WITH A FEW SUPERCELLS
CONTINUE MOVING ENEWD INTO OH AND KY FROM IND. A TORNADO WAS
REPORTED WITH THE STORM THAT MOVED THROUGH RIPLEY AND DEAR BORN
COUNTIES IN SERN IND SHORTLY AFTER 08Z. OTHER REPORTS OF DAMAGING
WIND IN SERN IND HAVE BEEN RECEIVED. AREA OF STRONGEST PRESSURE
FALLS CURRENTLY EXTENDS ACROSS OH AND ERN KY. THREAT FOR ISOLATED
TORNADOES AND DAMAGING WIND WILL CONTINUE AS THIS ACTIVITY
CONTINUES DEVELOPING ENEWD AROUND 45 KT TOWARD AXIS OF MARGINAL
SURFACE BASED CAPE THAT EXTENDS FROM SRN OH THROUGH NRN KY.
..DIAL.. 04/09/99
NNNN
999
WWUS34 KILN 090855
SVSILN
INZ074-090940-
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OHIO
453 AM EDT FRI APR 9 1999
SPOTTER REPORTS IN DEARBORN COUNTY INDICATE TORNADO DAMAGE IN THE AURORA AREA. LARGE TREES AND A BARN HAS BEEN REPORTED BLOWN DOWN. THE PARENT THUNDERSTORM IS MOVING TOWARDS HAMILTON AND BOONE COUNTIES.
THIS IS A DANGEROUS SITUATION. GO STRAIGHT TO YOUR BASEMENT IF A WARNING IS ISSUED.
.END/FRANKS
999
WFUS01 KILN 090853
TORILN
OHC061-090955-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
452 AM EDT FRI APR 9 1999
THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A
* TORNADO WARNING FOR...
HAMILTON COUNTY IN SOUTHWESTERN OHIO.
* UNTIL 555 AM EDT
* AT 450 AM EDT... WEATHER SPOTTERS INDICATED A TORNADO 17 MILES
WEST OF CINCINNATI OR 6 MILES SOUTHWEST OF HOOVEN... MOVING EAST
AT 35 MPH.
* THE TORNADO IS EXPECTED TO BE NEAR...
CHEVIOT AT 512 AM EDT .
MT HEALTHY AT 519 AM EDT .
CINCINNATI AT 520 AM EDT .
A TORNADO IS ON THE GROUND! GO TO THE BASEMENT! IF A BASEMENT IS
NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!
.END/SITES
&
ZCZC MKCSWODY1 000
ACUS1 KMKC 090056
MKC AC 090056
CONVECTIVE OUTLOOK...REF AFOS NMCGPH94O.
VALID 090100Z - 091200Z
REF WW NUMBER 0135...VALID TIL 0200Z
REF WW NUMBER 0136...VALID TIL 0200Z
REF WW NUMBER 0137...VALID TIL 0300Z
REF WW NUMBER 0138...VALID TIL 0600Z
THERE IS A HIGH RISK OF SVR TSTMS UNTIL AROUND 06Z OVER EXTREME
SOUTHEAST IOWA...CENTRAL ILLINOIS...AND EAST CENTRAL MISSOURI TO
THE RIGHT OF A LINE FROM 10 NNW VIH 15 E JEF 45 SSW UIN 25 NNW UIN
25 WNW BRL 25 SSW CID 25 E CID 20 ENE MLI 45 ENE BMI DNV 15 NW HUF
40 SSE MTO 25 ESE BLV 20 E VIH 10 NNW VIH.
SURROUNDING THE HIGH RISK...THERE IS A MDT RISK OF SVR TSTMS
OVERNIGHT FOR MUCH OF THE REMAINDER OF ILLINIOS...A LARGE PART OF
INDIANA...SOUTHWEST OHIO...NORTH CENTRAL KENTUCKY...AND A PART OF
SOUTHEAST MISSOURI. THE MDT RISK IS TO THE RIGHT OF A LINE FROM
30 SSE TBN 10 WNW TBN 20 ENE JEF 20 NNW UIN 35 S CID CID
30 WSW DBQ 25 SSE RFD 50 WSW SBN 25 S FWA 15 S DAY 25 SSE LUK
30 W LEX 45 E OWB 35 WSW EVV 10 SSW MDH 50 N P02 30 SSE TBN.
SURROUNDING THE HIGH AND MDT RISKS...THERE IS A SLGT RISK OF SVR
TSTMS TO THE RIGHT OF A LINE FROM 65 N GLH 30 E TXK 35 NW TYR 15
SSE DAL 10 WSW DAL 20 WNW PRX 20 WSW FSM 25 ENE FYV 15 WNW TBN 35
SW UIN 20 NNW UIN 40 S CID 20 NNE OTM 30 SW DSM 35 ESE LNK 15 NNW
BIE 30 WSW OLU OFK 10 E SUX 25 WSW MCW 35 SSE LSE 20 E MKE 15 SW
JXN 35 NW MFD 25 W ZZV 20 E 5I3 10 E TYS 35 ENE CHA 35 W RMG 35 ENE
TUP 65 N GLH.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 SSE SAV 25 W AGS
40 NNE ATL 30 W RMG 65 NNE GLH 20 ESE TXK 30 NNW TYR 15 SSE DAL
10 WSW DAL 20 WNW PRX 15 SSE FYV 10 NW TBN 40 SSW UIN 25 NNW UIN
25 ESE OTM 25 W 3OI 15 SW BIE GRI 45 E BUB 10 E YKN 20 ENE FRM VOK
45 NW MKG 20 W FNT MTC ...CONT... 35 ENE CLE 20 W MGW 10 NE ROA
10 WNW SOP MYR.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 45 NW UKI RBL
75 NE SVE 60 NW OWY 30 S SUN 15 SSW PIH 30 WNW EVW 20 S SLC
30 WNW MLF 45 WNW P38 55 WSW DRA 25 ENE BFL 40 ESE PRB 30 WSW PRB.
...SEVERE THUNDERSTORM FORECAST DISCUSSION...
...MIDDLE MISSISSIPPI AND LOWER OHIO RIVER VALLEYS...
ONGOING TORNADO OUTBREAK SHOULD CONTINUE THROUGH THE LATE EVENING
HOURS AS STRONG MID/UPPER JET STREAK SURGES ACROSS THE WARM SECTOR.
SURFACE DEWPOINTS IN THE MIDDLE 60S F EXTEND ACROSS CENTRAL
ILLINOIS...SOUTHERN INDIANA...AND SOUTHWEST OHIO SOUTH OF THE WARM
FRONT. 00Z ILX SOUNDING HAD IMPRESSIVE CURVED HODOGRAPH WITH 0-3
KM STORM RELATIVE HELICITY IN EXCESS OF 500 M2/S2 AND BRN SHEAR OF
132 M2/S2. IN ADDITION...ILN SOUNDING INDICATED THAT STEEP MID
LEVEL LAPSE RATES AROUND 7.5 C/KM ARE IN PLACE WELL DOWNSTREAM OF
CURRENT ACTIVITY.
TORNADO THREAT SHOULD GRADUALLY DIMINISH LATER THIS EVENING AS
BOUNDARY LAYER LAPSE RATES WEAKEN DUE TO LOSS OF INSOLATION.
HOWEVER...POTENTIAL FOR SEVERE SQUALL LINE RACING EAST WITH
WIDESPREAD WIND DAMAGE APPEARS RATHER HIGH GIVEN STRENGTH OF MID
LEVEL FLOW WITH 500 MB SPEED OF 80 KNOTS OBSERVED AT SGF.
...NORTHEAST TEXAS TO TENNESSEE...
CAPPING INVERSION IS RATHER STRONG PER 00Z SOUNDINGS AT LZK AND
SHV...WITH OBSERVED CONVECTIVE INHIBITIONS OF -90 TO -190 J/KG.
HOWEVER...SUFFICIENT LOW LEVEL CONVERGENCE ALONG ADVANCING COLD
FRONT/DRYLINE HAS INITIATED ISOLATED THUNDERSTORMS IN THE DALLAS
AREA. IN ADDITION...SQUALL LINE ON TAIL OF OUTBREAK EXTENDS INTO
NORTHWEST ARKANSAS. 18Z ETA INDICATED A 300 MB VORTICITY MAXIMUM
MOVING ACROSS OKLAHOMA AND INTO ARKANSAS DURING THE EVENING...WITH
A RATHER STRONG COUPLET OF POSITIVE/NEGATIVE LOW LEVEL THETA-E
ADVECTION SHOWN WITH ADVANCING FRONT.
THUS...SUFFICIENT UVVS ARE ANTICIPATED TO CONTINUE BREAKING CAPPING
INVERSION AS FRONT ADVANCES TOWARD MISSISSIPPI RIVER AND EVENTUALLY
TENNESSEE DURING THE NIGHT.
...EASTERN NEBRASKA INTO IOWA...
WELL DEFINED SPIRAL OF SHOWERS/THUNDERSTORMS BENEATH THE UPPER LOW
SHOULD GRADUALLY WEAKEN DURING THE EVENING WITH LOSS OF DIURNAL
HEATING. HOWEVER...ISOLATED MARGINALLY SEVERE THUNDERSTORMS WITH
HAIL WILL REMAIN POSSIBLE UNTIL ABOUT 04Z AS THE VORTICITY MAXIMUM
ROTATES ACROSS IOWA.
..CRAVEN.. 04/09/99
NNNN
ZCZC MKCSEL1 ALL 091200;372,0850 404,0844 404,0815 372,0821;
WWUS9 KMKC 090648
MKC WW 090648
OHZ000-KYZ000-WVZ000-091200-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 141
STORM PREDICTION CENTER NORMAN OK
248 AM EDT FRI APR 9 1999
THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN AND SOUTHERN OHIO
NORTHERN AND EASTERN KENTUCKY
FAR WESTERN WEST VIRGINIA
EFFECTIVE THIS FRIDAY MORNING FROM 300 AM UNTIL 800 AM EDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO
60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES WEST SOUTHWEST OF JACKSON KENTUCKY TO 55
MILES NORTH NORTHWEST OF COLUMBUS OHIO.
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION... CONTINUE...WW 140...
DISCUSSION...STRONG VERTICAL SHEAR /50 KT SW FLOW AT 850 MB VEERING
TO 70 KT WSW FLOW AT 500 MB/...AND PERSISTENT PRESSURE FALL AXIS
ALONG AND S OF E/W ORIENTED STATIONARY FRONT OVER CENTRAL OH
SUGGEST CONTINUED THREAT FOR ISOLATED TORNADOES DESPITE UNFAVORABLE
TIME OF DAY AS IND CONVECTION CONTINUES EWD. OTHER STORMS MAY FORM
INVOF SHALLOW N/S WARM FRONT NOW EXTENDING FROM NEAR DAY TO NEAR
JKL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 480.
MEAN STORM MOTION VECTOR 27050.
...CORFIDI
;372,0850 404,0844 404,0815 372,0821;
NNNN
ZCZC MKCWWAMKC ALL 091200;372,0850 404,0844 404,0815 372,0821;
WWUS8 KMKC 090852
MKC WW-A 090852
OHZ000-KYZ000-091100-
STATUS REPORT ON WW NUMBER 141
CONTINUE WW.
SCATTERED STRONG TO SEVERE THUNDERSTORMS WITH A FEW SUPERCELLS
CONTINUE MOVING ENEWD INTO OH AND KY FROM IND. A TORNADO WAS
REPORTED WITH THE STORM THAT MOVED THROUGH RIPLEY AND DEAR BORN
COUNTIES IN SERN IND SHORTLY AFTER 08Z. OTHER REPORTS OF DAMAGING
WIND IN SERN IND HAVE BEEN RECEIVED. AREA OF STRONGEST PRESSURE
FALLS CURRENTLY EXTENDS ACROSS OH AND ERN KY. THREAT FOR ISOLATED
TORNADOES AND DAMAGING WIND WILL CONTINUE AS THIS ACTIVITY
CONTINUES DEVELOPING ENEWD AROUND 45 KT TOWARD AXIS OF MARGINAL
SURFACE BASED CAPE THAT EXTENDS FROM SRN OH THROUGH NRN KY.
..DIAL.. 04/09/99
NNNN
999
WWUS34 KILN 090855
SVSILN
INZ074-090940-
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OHIO
453 AM EDT FRI APR 9 1999
SPOTTER REPORTS IN DEARBORN COUNTY INDICATE TORNADO DAMAGE IN THE AURORA AREA. LARGE TREES AND A BARN HAS BEEN REPORTED BLOWN DOWN. THE PARENT THUNDERSTORM IS MOVING TOWARDS HAMILTON AND BOONE COUNTIES.
THIS IS A DANGEROUS SITUATION. GO STRAIGHT TO YOUR BASEMENT IF A WARNING IS ISSUED.
.END/FRANKS
999
WFUS01 KILN 090853
TORILN
OHC061-090955-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
452 AM EDT FRI APR 9 1999
THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A
* TORNADO WARNING FOR...
HAMILTON COUNTY IN SOUTHWESTERN OHIO.
* UNTIL 555 AM EDT
* AT 450 AM EDT... WEATHER SPOTTERS INDICATED A TORNADO 17 MILES
WEST OF CINCINNATI OR 6 MILES SOUTHWEST OF HOOVEN... MOVING EAST
AT 35 MPH.
* THE TORNADO IS EXPECTED TO BE NEAR...
CHEVIOT AT 512 AM EDT .
MT HEALTHY AT 519 AM EDT .
CINCINNATI AT 520 AM EDT .
A TORNADO IS ON THE GROUND! GO TO THE BASEMENT! IF A BASEMENT IS
NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!
.END/SITES
&
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M2
Hi PolarBear - welcome from the nightly contingent.
I also remember these storms well (formerly from the North Coast, Best Location in the Nation, ...Walk Across to Canada....you know - up there
)
Anway there was a coach from the Bengals I believe who lived directly in the path of one of the Cincy tornadoes and he said he & his wife were sleeping upstairs in their upscale house and the house just started shaking. The roof and some of the walls were blown off, and they were wisked from their bed either onto the lawn or under some rubble someplace...I didn't save the recount. The problem was that since the tornadoes struck in pre-dawn hours, many were still sleeping and did not get the warnings. One neighborhood looked really bad - scraped/sucked down to their foundations or lower depending if they had basements or not. The morning air personallities from TV/Radio were the first ones to show video of the destruction and aftermath; l I don't believe there was footage of the tornadoes coming in unless they have found some by now. Another example of a tornado - large tornado - hitting a major city. Glad you were OK - but what excitement! 8)
I also remember these storms well (formerly from the North Coast, Best Location in the Nation, ...Walk Across to Canada....you know - up there
)
Anway there was a coach from the Bengals I believe who lived directly in the path of one of the Cincy tornadoes and he said he & his wife were sleeping upstairs in their upscale house and the house just started shaking. The roof and some of the walls were blown off, and they were wisked from their bed either onto the lawn or under some rubble someplace...I didn't save the recount. The problem was that since the tornadoes struck in pre-dawn hours, many were still sleeping and did not get the warnings. One neighborhood looked really bad - scraped/sucked down to their foundations or lower depending if they had basements or not. The morning air personallities from TV/Radio were the first ones to show video of the destruction and aftermath; l I don't believe there was footage of the tornadoes coming in unless they have found some by now. Another example of a tornado - large tornado - hitting a major city. Glad you were OK - but what excitement! 8)
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The Bengals coach was Al Roberts. The Cincinnati Enquirer special edition on the tornado and his story can be found here: http://cincinnati.com/tornado/
As far as I know, no one saw or caught the tornado on video. Spotters in southeast Indiana did see tornadoes leading up to this one, however. The tornado appears to have been rain wrapped when it did the most severe damage. Cincinnati WARN story: http://www.warn.org/news/index.cgi?Deta ... ort_rev=on
The Cincinnati part of the tornadoes brought about an upgrade or new installation of outdoor warning sirens in areas that had no sirens before. There was also a mad rush for NOAA Weather Radios (Radio Shack actually sold out). Because of mechanical problems and other problems, the Hamilton County EMA decided to sound the outdoor sirens for 5 minutes (instead of 3) for severe thunderstorm and tornado warnings, and test the countywide network twice a month (1st and 3rd Wednesday, instead of only the 1st Wednesday).
As far as I know, no one saw or caught the tornado on video. Spotters in southeast Indiana did see tornadoes leading up to this one, however. The tornado appears to have been rain wrapped when it did the most severe damage. Cincinnati WARN story: http://www.warn.org/news/index.cgi?Deta ... ort_rev=on
The Cincinnati part of the tornadoes brought about an upgrade or new installation of outdoor warning sirens in areas that had no sirens before. There was also a mad rush for NOAA Weather Radios (Radio Shack actually sold out). Because of mechanical problems and other problems, the Hamilton County EMA decided to sound the outdoor sirens for 5 minutes (instead of 3) for severe thunderstorm and tornado warnings, and test the countywide network twice a month (1st and 3rd Wednesday, instead of only the 1st Wednesday).
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therock1811
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