SE TX/SW LA weather: Much cooler and WET after Tuesday

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Ed Mahmoud

Re: SE TX/SW LA weather: Spring-like pattern

#1141 Postby Ed Mahmoud » Mon Mar 31, 2008 10:47 pm

I kind of hope I'm wrong, but the WRF, the older NAM model, the ETA and the NGM do not show much rain tomorrow around my yard.

Official NWS forecast as of 10:30pm
Tuesday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Some of the storms could be severe. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 86. Calm wind becoming south around 5 mph.



Enough CAPE, around 1000 J/Kg in HOU area, closer to 1500 J/Kg a little further North early afternoon, but no wind at all to speak of in the bottom 4 km of the atmosphere, and 20 knot flow at 500 mb, which suggests whatever storms do fire on the front will dump their cool and stable outflow pretty much where they sit, and choke themselves off.


Well, on further review, (checked Utah U wx site, which doesn't have skew-T forecasts like NIU, but does have 3 hour intervals) while widespread severe still looks improbable, and WRF rainfall is meager, at 4 pm there will be a corridor of CAPE near 2000 J/KG along US 59 SW of HOU (MUCAPE, not SBCAPE, but I suspect it is almost the same in this case), so while the isolated storms will be few, far between and short lived, one or two could briefly be rambunctious.



But a tenth or so of rain means more work for the sprinkler on Saturday.
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#1142 Postby southerngale » Tue Apr 01, 2008 12:07 am

This afternoon, NWS had us at 50% for tomorrow, but they lowered it to 30% during tonight's update.

Oh, btw... the rain finally quit dancing around me yesterday.... got a decent amount last night.

I hope tomorrow is dry... got a softball game!
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Re: SE TX/SW LA weather: Spring-like pattern

#1143 Postby Ed Mahmoud » Tue Apr 01, 2008 7:53 am

As could almost be expected, SE Texas has been dropped from SLIGHT RISK down to "See Text".


Relevant SNIP of 1300 SWODY1

...GULF AND SE ATLANTIC COAST STATES TODAY...
A COLD FRONT WILL MOVE SEWD FROM THE LOWER OH VALLEY THIS MORNING TO
THE SRN APPALACHIANS TONIGHT...WHILE THE WRN PORTION OF THE FRONT
ACCELERATES SWD ACROSS TX IN RESPONSE TO PRONOUNCED PRESSURE RISES
IN LATEST SURFACE ANALYSES. THE FRONT IS PRECEDED BY A REMNANT
OUTFLOW BOUNDARY ACROSS CENTRAL MS/AL...NW GA...AND ERN TN. THE
RICHER BOUNDARY LAYER MOISTURE EXISTS FROM MS WWD INTO TX IN ADVANCE
OF THE FRONT...WITH LESSER MOISTURE ACROSS THE INTERIOR SE STATES.

THE STRONGER INSTABILITY IS EXPECTED THIS AFTERNOON IN ADVANCE OF
THE FRONT/DIFFUSE OUTFLOW ACROSS TX/LA...AND WIDELY SCATTERED TO
SCATTERED THUNDERSTORMS SHOULD DEVELOP NEAR THE FRONT AND REMNANT
OUTFLOW. HOWEVER...VERTICAL SHEAR WILL WEAKEN WITH TIME IN THE WARM
SECTOR AS THE PRIMARY SYNOPTIC WAVE MOVES WELL N/NE OF THE GULF
COAST...AND ORGANIZED SEVERE STORMS APPEAR UNLIKELY. INSTEAD...WILL
MAINTAIN LOW HAIL/WIND PROBABILITIES THROUGH THE AFTERNOON TO COVER
THE MARGINAL SEVERE THREAT.
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Re: SE TX/SW LA weather: Spring-like pattern

#1144 Postby Ed Mahmoud » Tue Apr 01, 2008 11:37 am

Clouds are hanging tough, temps in mid 70s, outflow boundary moving into Northern suburbs.


One the one hand, it probably kills whatever convergence the actual cold front has, with light North winds South of the main cold front, and stronger North winds North of it, but maybe it will clear out the clouds and allow some daytime heating to destabilize the Houston area airmass.

Image
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Re: SE TX/SW LA weather: Spring-like pattern

#1145 Postby jasons2k » Tue Apr 01, 2008 12:50 pm

Almost impossible to tell what will happen later today with the front. I hope we can get some rain out of it though too. My sprinkler system is down -- needs a few new heads and I can't get to it until this weekend.
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Re: SE TX/SW LA weather: Spring-like pattern

#1146 Postby Ed Mahmoud » Tue Apr 01, 2008 1:10 pm

Moderate shower now at Galleria. Looking at radar, it mostly missed the house.
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#1147 Postby jasons2k » Tue Apr 01, 2008 1:41 pm

Here comes the sun....I wonder if we'll get enough to unsettle things...
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Re: SE TX/SW LA weather: Spring-like pattern

#1148 Postby Ed Mahmoud » Tue Apr 01, 2008 3:07 pm

Poor Floridian posters, already talking summer weather.


Nice place to visit, I lived there for a year, but they don't have four complete seasons.
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Re: SE TX/SW LA weather: Spring-like pattern

#1149 Postby Ed Mahmoud » Tue Apr 01, 2008 3:40 pm

Not sure anything more than meager showers will form, but that front sure looks nice on satellite.


Image
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#1150 Postby Extremeweatherguy » Tue Apr 01, 2008 4:03 pm

A few cells are beginning to pop as the front slowly pushes closer to the area...

http://www.wunderground.com/radar/radbl ... ightning=1
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Re: SE TX/SW LA weather: Spring-like pattern

#1151 Postby jasons2k » Tue Apr 01, 2008 8:57 pm

I managed to collect .68". Not bad - and my lawn is happy :-)
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Re: SE TX/SW LA weather: Spring-like pattern

#1152 Postby Tampa Bay Hurricane » Tue Apr 01, 2008 9:12 pm

It's April so anytime now one of those severe squalls will form spring style
and march across Texas and the southern plains. Tornado chaser season
is starting.

Ed Mahmoud wrote:Poor Floridian posters, already talking summer weather.


Nice place to visit, I lived there for a year, but they don't have four complete seasons.


That's why hurricane season is so excitement packed for stormchasers here- I
wait all year long anticipating what the crazy old tropics will spin up- all
our wildest days come during hurricane season :cheesy: But the damage is bad
of course. When the hurricane season ends, it is a bit of a let down for
a hurricane chaser nut like me...but there's always the next year's season.
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Re: SE TX/SW LA weather: Spring-like pattern

#1153 Postby PTrackerLA » Wed Apr 02, 2008 2:33 pm

Looks like our annual summer-time tropical funnel clouds are back already! I kept thinking how much the weather today reminds me of a typical summer day with hit or miss showers and storms developing over the area. Alot of times funnel clouds are reported as these showers quickly form and sure enough we had one over just a short while ago. These are pretty common in the summer (I saw one myself a few years back), but I've never heard of them this early in the year:

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
216 PM CDT WED APR 2 2008

LAZ041>045-051>055-TXZ215-216-022315-
CALCASIEU-JEFFERSON DAVIS-ACADIA-LAFAYETTE-UPPER ST. MARTIN-
CAMERON-VERMILION-IBERIA-ST. MARY-LOWER ST. MARTIN-JEFFERSON-
ORANGE-
INCLUDING THE CITIES OF...LAKE CHARLES...JENNINGS...CROWLEY...
LAFAYETTE...ST. MARTINVILLE...CAMERON...ABBEVILLE...NEW IBERIA...
MORGAN CITY...BEAUMONT/PORT ARTHUR...ORANGE
216 PM CDT WED APR 2 2008

...TROPICAL FUNNEL CLOUDS POSSIBLE THIS AFTERNOON...

AT 205 PM...A PILOT FLYING NEAR LAFAYETTE REPORTED A FUNNEL CLOUD.

A VERY MOIST AND UNSTABLE TROPICAL AIRMASS IS IN PLACE ACROSS THE
AREA. MEANWHILE THE VERTICAL WIND PROFILE OVER THE AREA SHOWS LIGHT
AND VARIABLE WINDS. THESE CONDITIONS ARE FAVORABLE FOR THE
DEVELOPMENT OF TROPICAL FUNNEL CLOUDS...ESPECIALLY WHERE RAIN
COOLED BOUNDARIES CALLED OUTFLOW BOUNDARIES MEET OR COLLIDE WITH
THE SEA BREEZE FRONT.

THESE TROPICAL FUNNEL CLOUDS ARE USUALLY SHORT-LIVED AND DO NOT
REACH THE GROUND. IF THE FUNNEL CLOUD BECOMES MORE SEVERE AND
REACHES THE GROUND...MINOR DAMAGE MAY OCCUR...AND A TORNADO WARNING
WILL LIKELY BE ISSUED.

STAY TUNED FOR LATER STATEMENTS AND UPDATES ON THIS WEATHER
SITUATION
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Re: SE TX/SW LA weather: Spring-like pattern

#1154 Postby jasons2k » Wed Apr 02, 2008 2:37 pm

Yeah, we don't normally see this until May. I have notice that the shelf waters have warmed dramatically over the last week or so - already up to 75F in Galveston.
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#1155 Postby CajunMama » Wed Apr 02, 2008 3:07 pm

Well PT...we're in the 10% chance of rain area! I've had 2 hard downpours enough to over \flow the gutters and have ponding water in the backyard.

WEATHER UPDATE: Tropical funnel cloud reported near Lafayette

The National Weather Service has issued a special weather statement for the Lafayette area after a pilot reported seeing a funnel cloud near the city about 2:05 p.m. today.
There were no immediate reports that the funnel cloud touched down.

A moist, unstable tropical air mass and light, variable winds, conditions that prevail here today, are conducive to the development of tropical funnel clouds, the National Weather Service said.

The funnel clouds are short-lived and rarely touch down. If the funnel cloud becomes more severe and reaches the ground, minor damage may occur, and a tornado warning would probably be issued.


http://www.theadvertiser.com/apps/pbcs. ... 1/80402025
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Re: SE TX/SW LA weather: Spring-like pattern

#1156 Postby Ed Mahmoud » Wed Apr 02, 2008 4:40 pm

HGX AFD snippet shows forecaster (#47?) not excited about severe weather for HOU area Friday.


LOW LEVEL JET INCREASES THURS AND ANTICIPATE SOME FAIRLY GUSTY
SOUTHERLY WINDS BY LATE MORNING AND EARLY AFTERNOON ONCE WE SEE
SOME MIXING. NO BOUNDARY/FOCUS FOR MUCH PRECIP THURS SO WILL KEEP
THE SILENT 10% IN PLACE. COLD FRONT MOVES INTO SE TX FRI MORNING
AND OFF THE COAST BY LATE AFTERNOON. PW`S OF 1.6-1.8" POOL ALONG
THE BOUNDARY. CAPES OF 1000-2000 AND LI`S OF -3 TO -5 FCST NOTED
ACROSS THE SSE 1/3 OF THE CWA AHEAD OF THE FRONT. HOWEVER...BOTH
NAM AND GFS SOUNDINGS SHOW A SUBSTANTIAL CAP IN PLACE AHEAD OF THE
BOUNDARY. BOTH ALSO MIRACULOUSLY ERODE IT JUST BEFORE FROPA BUT
FIND IT REALLY HARD TO BELIEVE
...
ESPECIALLY CONSIDERING THE MAIN
TROF AXIS & COOLER UPPER TEMPS IS STILL DISPLACED WELL TO THE NW.
BOTH MODELS SEEM TO HAVE BEEN DOING THIS (AND FCSTING TOO HIGH OF
MOISTURE LEVELS TOO) ALL YEAR MAKING FOR MANY NON-EVENTS. CURRENT
HUNCH IS THAT WE`LL SEE A THIN BAND OF EVERYDAY SHRA/TSTMS DEVELOP
ALONG THE IMMEDIATE BOUNDARY AS IT PUSHES THROUGH THE AREA.
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Re:

#1157 Postby PTrackerLA » Wed Apr 02, 2008 10:12 pm

About as much rain as you get for a 10% day. I'd estimate we received around 2" in my area, hopefully cleaning alot of the pollen out of the air too. We were just getting to the point that a heavy rain was needed so no complaints around here!


CajunMama wrote:Well PT...we're in the 10% chance of rain area! I've had 2 hard downpours enough to over \flow the gutters and have ponding water in the backyard.

WEATHER UPDATE: Tropical funnel cloud reported near Lafayette

The National Weather Service has issued a special weather statement for the Lafayette area after a pilot reported seeing a funnel cloud near the city about 2:05 p.m. today.
There were no immediate reports that the funnel cloud touched down.

A moist, unstable tropical air mass and light, variable winds, conditions that prevail here today, are conducive to the development of tropical funnel clouds, the National Weather Service said.

The funnel clouds are short-lived and rarely touch down. If the funnel cloud becomes more severe and reaches the ground, minor damage may occur, and a tornado warning would probably be issued.


http://www.theadvertiser.com/apps/pbcs. ... 1/80402025
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Re: SE TX/SW LA weather: Spring-like pattern

#1158 Postby jasons2k » Fri Apr 04, 2008 8:06 am

Morning update from Jeff Lindner issued an hour ago (7AM):

SPC has issued a Severe Thunderstorm Watch until 1100am for the northern ½ of SE TX…roughly along and N of I-10. Actual watch box math does include much of Harris Co, but local WFO decided not to include at this time.

Discussion:

Incoming cold front has sparked a few intense thunderstorms over C TX this morning with a very nasty cell moving just N of Austin currently with extrapolation E into N Brazos Co just N of KCLL in the next hour. This storm has a history of producing marble to nickel size hail from Marble Falls to Georgetown this morning. Elsewhere capping remains very strong along and S of HWY 105…even though SPC watchbox includes areas south of this line. Cold front currently located from near Del Rio to NW of Austin to DFW moving SE and should enter the area later this morning. Lift along the front along with passing short wave may be just enough to lift and remove the capping along and N of I-10…so suggest the models showing a breakable capping layer by mid to late morning roughly from Columbus to Liberty northward. Still not sure the cap will be weak enough to allow much to fire off as C TX convection has struggled and large convective plume (anvil) from supercell W of KCLL will result in little heating over our N 1/3rd areas this morning. However cap is weakest over the northern counties and this will be the best area to see something punch through and go severe.

Given moist air mass with near 70 degree dewpoints and modest WSW to SW shear any storms that do break through will quickly go severe. Isolated nature of cells this morning along northern edge of capping inversion suggest main threat will be damaging intense supercells with a very large hail threat. Only modest wind shear should negate much of a tornado threat. Additionally storm reports per public and observers in C and N TX overnight have mainly been severe hail reports.

Front will sweep off the coast late this afternoon with much drier and cooler air mass filtering in. Very nice weekend in store with lows in the low to mid 50’s and highs in the upper 70’s with low humidity under sunny skies. Return Gulf flow begins Sunday and slow moistening trend will onset with overnight lows warming back into the 60’s by early next week.
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Re: SE TX/SW LA weather: Spring-like pattern

#1159 Postby Ed Mahmoud » Fri Apr 04, 2008 8:07 am

The cap of forged steel will almost certainly prevent any deep activity ahead of the cold front in SE Texas, but there could be showers along the front, and the 18Z GFS suggests enough elevated instability between 650 mb and 250 mb for some very elevated storms behind the front.


Now, SW Louisiana might get a little heating before the front gets there, and with their Southwest winds aloft not quite as directly off the hot and dry Mexican plateau as Houston's, they have a better chance at surface based storms. Not a whole lot of low level wind, so severe threat isn't huge, but at least a chance.

Image

Image
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#1160 Postby southerngale » Fri Apr 04, 2008 11:05 am

This morning, I had a 40% chance of rain for today. NWS just upped it to 70%, with a chance of severe weather. The weather alert just went off... tornado watch as well. Image

Last night, I thought today was a non-event, and maybe not even any rain. How quickly things change.

I doubt we'll see any tornadoes though...
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