Texas Spring 2017

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bubba hotep
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Re: Texas Spring 2017

#261 Postby bubba hotep » Sun Mar 26, 2017 9:46 am

TexasF6 wrote:Are we not expecting the CAP to break west of Austin? The STP on the HRRR is out of bounds on the last run.


I haven't looked at things down there but my guess would be that the best forcing is too far removed with the system tracking through Oklahoma.
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Re: Texas Spring 2017

#262 Postby bubba hotep » Sun Mar 26, 2017 10:36 am

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Re: Texas Spring 2017

#263 Postby 1900hurricane » Sun Mar 26, 2017 11:35 am

Targeting Bowie today.
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Re: Texas Spring 2017

#264 Postby aggiecutter » Sun Mar 26, 2017 11:50 am

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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#265 Postby bubba hotep » Sun Mar 26, 2017 1:21 pm

Latest runs of the TX Tech WRF and HRRR continue to show the threat extended as far south as DFW this afternoon. The southern portion could have access to a deeper moisture profile.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#266 Postby Tireman4 » Sun Mar 26, 2017 1:42 pm

Very warm and breezy in Houston.

81
S 16 G 25 mph

Yuck. Mowed this morning. Sweat. Ughh in March.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#267 Postby EF-5bigj » Sun Mar 26, 2017 2:06 pm

Looks like it could get interesting later I hope people stay Weather aware.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#268 Postby TheProfessor » Sun Mar 26, 2017 2:10 pm

Unless there's something wrong with the Skew-T's on Tropical tidbits, the 17z HRRR doesn't really impress me(For Denton county and near the Red River). The best energy available right now on the run is actually about to occur in the next couple of hours. The temperature profiles after that aren't typically supportive of the maximum amount of CAPE that can be achieved. Around hour 4 the dewpoint depression is greater than 15 which isn't typically good for lower cloud ceilings. Then throughout the run a capping inversion begins to form and eventually a temperature inversion forms as well. The wind profiles don't look to be the best on this run, but they could be worse(chasing wise.) Just going off these soundings I would predict any storm would be elevated. Now these soundings might not be right since it is a model, I would need to see an actual sounding to see if the temperature profiles are similar to this run.

However, the 12z WRF ARW is rather interesting, there's still a capping inversion that develops(with out this there would be great concern) Dewpoint depression is within 15 and that low that the model spawns provides some insane wind shear in the lower levels(50 KTS near the surface). The NMM is further south and has more CAPE and still rather impressive wind profile. It also has a much better dewpoint depression and if that low were to allow the CAP to break and perhaps increase the CAPE at the same time I'd say there's definitely a tornado threat.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#269 Postby Texas Snowman » Sun Mar 26, 2017 2:11 pm

Warning- very unscientific post follows.

This afternoon here in the Red River Valley, there is a look and feel to the atmospheric conditions that reminds me of other significant severe weather days.

Stay weather aware.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#270 Postby opticsguy » Sun Mar 26, 2017 2:12 pm

I don't want to be at the southern end of that line, but the latest HRRR put's it right over my house.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#271 Postby Texas Snowman » Sun Mar 26, 2017 2:13 pm

Steve McCauley's most recent Facebook post an hour ago:

"Latest weather data continue to support the notion of a significant severe weather event for the Southern Plains which includes most of Oklahoma and at least the northern portions of north Texas. The cap - which has protected north Texas on several occasions in recent weeks - will become paper thin over north Texas and may no longer be able to prevent severe storms locally. If the cap does indeed break - and it appears that it will - this will allow the dryline to our west to activate with the result being rapid supercell thunderstorms that will track to the east. Pocket change hail to baseball-sized hail - possibly larger - and torrential rainfall along with damaging winds will be likely in the stronger storms. The storms will also be rotating, and thus tornado potential will be moderate.

If the storms do rotate fast enough, they could move TO THE RIGHT of their initial eastward motion and thus drop more to the southeast which would put more of the Metroplex in the path of potential severe weather. But this "right-hand turn" is nearly impossible to predict this far in advance when not even the first clouds have formed.

The National Weather Service will be launching a special weather balloon to check on cap strength as well as the quality of our moisture supply that will feed the expected storms.

The cap should break FIRST after 4 PM to our west and northwest along a line from near Stephenville to Bowie to Oklahoma City. Storms will then move east and rapidly intensify moving into at least parts of the Metroplex by early evening.

This forecast radar graphic does not show any storms to our south, BUT please keep in mind that if there is any weakness in the cap that is not currently being observed, a storm could break through even to the south and southwest. Thus, even if you are in the southern half of the area, keep alert for any potential storm that manages to break through there.

This would be a good day to review severe weather safety rules with the family. It might also be a good idea to arrange shelter for vehicles against the threat of large hail this evening, especially across the northern half of north Texas.

Stay tuned for updates..."
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#272 Postby TheProfessor » Sun Mar 26, 2017 2:18 pm

Just going by the 18z HRRR I just get the feeling that those storms will be elevated(less risk for tornadoes) due to the wide Dewpoint depression. Storms seem to be out ahead of the Low pressure and the dryline that would provide the best lift as well. Now if the WRF ARW and NMM are right about their being a better lifting mechanism(stronger and closer low pressure) and closer dewpoint depressions, then there is definitely a threat for tornadoes.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#273 Postby TheProfessor » Sun Mar 26, 2017 2:24 pm

3K NAM has some pretty decent profiles on long the Red River, there's still a capping inversion when the model depicts storms happening, but the dew point depression is a lot lower, would allow for lower cloud ceilings if there was enough lift.

Edit: 3K Name also looks pretty potent for Denton County as well.
Last edited by TheProfessor on Sun Mar 26, 2017 2:31 pm, edited 1 time in total.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#274 Postby opticsguy » Sun Mar 26, 2017 2:30 pm

Here in N. Dallas the sun has been out since about 10 and it's really warming up. 80F right now with a DP of 60 per my weather station. This irks me because I wanted to pick up my plane from my mechanic NW of Fort Worth and the TAFs had low ceilings most of the day when I had to make the call (7 AM). The 12Z NAM had 74F for KDAL at 19Z and it was 82F per the latest METAR.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#275 Postby EF-5bigj » Sun Mar 26, 2017 2:46 pm

Basically what I'm seeing is if something breaks through the CAP then it could explode and become extremely dangerous.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#276 Postby bubba hotep » Sun Mar 26, 2017 2:57 pm

SPC about to pull the trigger

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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#277 Postby Ntxw » Sun Mar 26, 2017 3:27 pm

Low level shear is pretty impressive. Big storms this afternoon, the further south they initiate the more problematic it will be for DFW. Don't want any hailers...for sure..
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#278 Postby JDawg512 » Sun Mar 26, 2017 3:36 pm

Our severe weather threat won't start till Tuesday/Wednesday for the Austin area. In the mean time just more of the same. If any bad storms do develop in the DFW area, hope everyone up there stays safe.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#279 Postby TheProfessor » Sun Mar 26, 2017 3:43 pm

Norman's 19z Sounding looks rather decent, especially if they get more moisture in the afternoon(There's actually a quite a bit around the 725mb level. Wind profiles are pretty good. LCL is kind of high, but that would decrease as moisture advects northward. There's still a capping inversion, however, Level of Free convection(the height in which the parcel of air must rise before it can grow into a storm) is rather high. But with more moisture and enough lift(to break the cap) it wouldn't matter since the LCL is far lower. There isn't a ton of CAPE there right now, but when the winds are 45 kts around the 825mb level 1,000-2,000 j/kg of CAPE(there's not that much yet) is sufficient enough to get some violent storms.
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Re: Texas Spring 2017 | MDT risk for parts of North Texas

#280 Postby BrokenGlassRepublicn » Sun Mar 26, 2017 3:51 pm

19 UTC HRRR seems to target DFW just after sunset.**

** Not a MET or EXPERT, just a guy with a radar link.
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