Overnight Severe Thunderstorm Watches

[ColdFront77]

Click ---> http://www.spc.noaa.gov/products/watch/ww0229.gif for graphic

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 229
NWS STORM PREDICTION CENTER NORMAN OK
1210 AM CDT SUN MAY 4 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHWEST IOWA
NORTHEAST KANSAS
NORTHWEST MISSOURI
EASTERN NEBRASKA

EFFECTIVE THIS SUNDAY MORNING FROM 1210 AM UNTIL 600 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 55
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 105 STATUTE MILES
EAST AND WEST OF A LINE FROM 65 MILES NORTH OF OMAHA NEBRASKA TO
40 MILES EAST SOUTHEAST OF EMPORIA KANSAS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.


OTHER WATCH INFORMATION...CONTINUE...WW 228...


DISCUSSION...ELEVATED THUNDERSTORMS WILL LIKELY INCREASE IN
COVERAGE/INTENSITY THE NEXT FEW HOURS OVER NE KS/NW MO...WITH
ADDITIONAL DEVELOPMENT EXPECTED OVER SE NEB/SW IA DURING THE EARLY
MORNING HOURS. INCREASING ELEVATED INSTABILITY /CAPE VALUES OF
1500-2000 J/KG/ AND STEEP MID LEVEL LAPSE RATES IN CONJUCTION WITH
STRONG WAA ON THE 50-60 KT LOW-LEVEL JET WILL SUPPORT A THREAT OF
LARGE HAIL WITH THE STRONGEST STORMS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 24035.


THOMPSON



Click ---> http://www.spc.noaa.gov/products/watch/ww0228.gif for graphic

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 228
NWS STORM PREDICTION CENTER NORMAN OK
1010 PM CDT SAT MAY 3 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

CENTRAL NEBRASKA

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM
1010 PM UNTIL 400 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 55
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 115 STATUTE MILES
EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF AINSWORTH
NEBRASKA TO 50 MILES EAST OF MCCOOK NEBRASKA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION... THIS SEVERE THUNDERSTORM WATCH REPLACES TORNADO WATCH NUMBER 224. WATCH NUMBER 224 WILL NOT BE IN EFFECT AFTER 1000 PM CDT. CONTINUE...WW 226...WW 227...WW 228...


DISCUSSION...ONGOING STORMS IN WRN NEB SHOULD CONTINUE TO MOVE EWD WITH AN ATTENDANT THREAT OF LARGE HAIL THE NEXT FEW HOURS. THE
THREAT FOR ELEVATED SEVERE STORMS WILL ALSO INCREASE BY ABOUT 04-06Z ACROSS CENTRAL NEB ON THE NOSE OF A STRENGTHENING LOW-LEVEL
JET...WHERE ELEVATED CAPE SHOULD INCREASE TO 1500-2500 J/KG
OVERNIGHT AS MOISTURE SPREADS NWD FROM OK/KS. VERTICAL SHEAR OF
50-60 KT THROUGH THE CLOUD BEARING LAYER MAY ALSO SUPPORT ELEVATED
SUPERCELLS...WHICH WOULD ENHANCE THE THREAT FOR LARGE HAIL DURING
THE EARLY MORNING HOURS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25035.


THOMPSON