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2019 Rain Thread


Biff Tannen

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Here is the latest from the NWS.

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And the latest from Jeff Lindner:

Heavy rainfall event and flash flood threat this evening through Thursday for SE TX.

Flash Flood Watch will go into effect at 100pm today along and SE of a line from Wharton to Houston to Cleveland

Mid level low pressure system clearly noted in radar data from Houston and Corpus Christi continues to spin over the NW Gulf of Mexico about 150 miles south of Palacios. Numerous rainbands have formed in the last few hours across the NW Gulf of Mexico from Galveston Bay to over 200 miles off the upper TX coast and are rotating inland as far as Downtown Houston this morning. Brief heavy rainfall is likely with these bands this morning. Overall expect an increase in the frequency of these bands today and some potential for cell training in the Flash Flood Watch area which could produce a quick 1-2 inches of rainfall through this afternoon.

Mid level low pressure system and weak surface low/trough will begin to slowly lift northward into SE TX tonight through Wednesday night with numerous showers and thunderstorms expected. Best estimate track for this feature is inland over Matagorda/Brazoria Counties and then slowly NNE into Fort Bend and Harris Counties Wednesday and NNE toward Montgomery and San Jacinto Counties on Thursday. Global guidance has shifted ever so slightly eastward overnight with the track of this feature. Heavy rainfall both near the core or center of the low pressure area and within bands on the eastern and southern flank of the system will be likely. This becomes especially true late tonight into Wednesday as the 850mb moisture transport increases along with good low level inflow off the Gulf of Mexico. Moisture values will be extremely high during the period with PWS ranging from 2.35-2.65 inches which will support intense rainfall rates in any deep and sustained convective developments.

Rainfall Amounts:
Widespread rainfall amounts of 5-7 inches are expected over much of the area with isolated totals of 10-12 inches. Deep tropical moisture in place will support excessive hourly rainfall rates in deeper convection with rates of 1-3 inches possible. While grounds are dry, rainfall today will start to result in gradual saturation of the soil conditions and as rainfall totals increase over the next 24-36 hours run-off will also increase. Flash flooding will be possible under any areas of sustained training or cell clustering. Some of the higher resolution guidance is showing some indications of banding and potential for cell training late tonight into much of Wednesday over the region.

Hydro:
While watersheds are currently running below base flow, expected rainfall amounts will almost certainly lead to significant run-off once grounds become saturated. Rises on creeks and bayous to bankfull or above will be possible leading to more significant flooding. High short duration rainfall rates will lead to street flooding at times. Think most of Harris County can currently handle 5-6 inches of rainfall before significant bayou and creeks flooding would be a concern. However this greatly depends on the intensity of the rainfall rates and any breaks between the intense rainfall cells. Given the complexities in where any sort of training bands may become established yields little confidence on where any higher totals and larger flood threat would be.

WPC has placed portions of SE TX in a moderate risk for flash flooding today, Wednesday, and Thursday.

Edited by Hate
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This thing is pretty much a cinch to completely miss Austin and bring no rain.  That's absolutely gonna happen.  Metaphysical certitude.
How much?  Where?  None, nowhere.  (Looks like Wed-Thur are the peak disappointments).



"FIFY" - Forcefield

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I will say this - Ike was the only "real" hurricane that we've had in the recent past and it was bad because the electricity went out for several days.

The flooding from both Allison and Harvey was also bad, no doubt, but there was no need to go hoard gasoline or ice or whatever because the power never went out. 

The wind is going to get a little higher with this thing but I doubt the power is going to go out because the center is already on land, so anyone freaking out for gasoline and ice (and bread and milk) is wasting their time. 

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After all of those near misses in the last month, it’s nice to finally be in the bullseye. We’ve only gotten a little over 3 inches of rain out of this tropical storm so far, but things appear to be taking a turn towards the wet...like South Austin’s mom.

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