Troy Kimmel Weather

Forecasting Austin and South Central Texas Weather Since 1984

A Flash Flood WATCH Continues into Thursday (Wed/09Sep2020)

Audio Weather Webcast
(Includes My Complete Forecast Reasoning)
Updated Wednesday / 09 September 2020 ….

   
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AUSTIN / UNIVERSITY OF TEXAS
WEATHER HAZARDS THROUGH 12 MIDNIGHT TONIGHT…

… Lightning Threat with Any Thunderstorm Today Through Tonight …

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AUSTIN / UNIVERSITY OF TEXAS WEATHER
SEVEN DAY WEATHER HEADLINES
AND MY 7 DAY FORECAST CONFIDENCE …

(1) A very complicated weather pattern has set up for the next few days as abundant low level moisture from the Gulf of Mexico moves northward across the area ahead of a deepening trough, or line, of upper level low pressure in the Rockies and intermountain west. A strong cold front, with a 20 to 30 degree drop in temperatures, is moving slowly eastward this morning and extends south southwestward from western Oklahoma and north Texas into the Rio Grande plains east and south of Del Rio.

(2) As our atmosphere continues excessively moist and unstable and the cold front moves east southeastward, scattered to numerous rain showers and thunderstorms will continue locally with the cold front pulling very sluggishly eastward through the IH35 corridor late tonight. Even as a little cooler air takes hold, an overrunning pattern, with scattered rain showers and a few thunderstorms will prevail for tomorrow into tomorrow night.

(3) After a brief break in rain chances Friday through Saturday into Saturday night, another cold front and upper air disturbance will move into the area by Sunday into the first part of next week with increased rain and thunderstorm chances again.

MY FORECAST CONFIDENCE OVER THE NEXT SEVEN DAYS…
Today through Saturday night..
High confidence
Saturday Night through Tuesday..
Moderate to high confidence

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Troy’s Weather Forecast for Austin and South Central Texas
Updated  Wednesday / 09 September 2020

… NWS / Austin San Antonio has issued a FLASH FLOOD WATCH valid into Thursday for the Austin metro area and the IH35 corridor …

TODAY…. Cloudy with numerous rain showers and thunderstorms with an associated lightning threat. A 70%chance of rain; where rainfall occurs, it will average 0.50″ to 1.00″. High 84. South southeasterly wind 5 to 12 mph.

TONIGHT…. Cloudy and turning a little cooler as a cold front passes by midnight. Rain showers and thunderstorms with an associated lightning threat. Periods of heavier rain possible. A 90%chance of rain; where rainfall occurs, it will average another 0.50″ to 1.00″. Low 64. East southeasterly wind shifting north northwesterly 5 to 12 mph.

THURSDAY…. Cloudy with scattered rain showers and a few thunderstorms early becoming more scattered as skies become partly cloudy in the afternoon. An associated lightning threat with any thunderstorm. A 60%chance of rain in the morning decreasing to 30%by afternoon; where rainfall occurs, it will average 0.25″ to 0.50″. High 81. Northerly wind 8 to 15 mph.

THURSDAY NIGHT…. Partly cloudy with widely scattered rain showers. A 20%chance of rain; where rainfall occurs, it will average 0.25″. Low 64. Northerly wind 5 to 12 mph.

FRIDAY…. Partly cloudy with widely scattered rain showers and thunderstorms with an associated lightning threat. A 20%chance of rain; where rainfall occurs, it will average less than 0.25″. High 88. Northerly wind 5 to 10 mph.

FRIDAY NIGHT…. Partly cloudy. Low 68. Light northerly wind.

SATURDAY…. Partly cloudy with widely scattered afternoon rain showers and thunderstorms with an associated lightning threat. A 20%chance of rain; where rainfall occurs, it will average less than 0.25″. High 89. Light northerly wind.

SATURDAY NIGHT…. Partly cloudy. Low 72. Light wind.

SUNDAY…. Partly cloudy with scattered rain showers and thunderstorms by afternoon with an associated lightning threat. A 50%chance of rain; where rainfall occurs, it will average 0.25″. High 90. Light wind.

SUNDAY NIGHT…. Partly to mostly cloudy with scattered rain showers and thunderstorms with an associated lightning threat. A 30%chance of rain; where rainfall occurs, it will average 0.25″. Low 71. Northerly wind 5 to 10 mph.

MONDAY…. Mostly cloudy with scattered rain showers and thunderstorms with an associated lightning threat. A 50%chance of rain; where rainfall occurs, it will average 0.25″. High 87. North northeasterly wind 5 to 10 mph.

MONDAY NIGHT…. Mostly cloudy with scattered rain showers and thunderstorms with an associated lightning threat. A 30%chance of rain; where rainfall occurs, it will average 0.25″. Low 71. Northerly wind 5 to 10 mph.

TUESDAY…. Mostly cloudy with scattered rain showers and thunderstorms with an associated lightning threat. A 50%chance of rain; where rainfall occurs, it will average 0.25″. High 87. North northeasterly wind 5 to 10 mph.

NATIONAL WEATHER SERVICE / 8 TO 14 DAY OUTLOOK           
Valid Wednesday / 16 September 2020 through Tuesday / 22 September 2020…
Temperatures… Near to Slightly Below Average    
Precipitation… Above Average

AUSTIN SUNSET/SUNRISE TIMES…..
Sunrise this morning (09 September)…………………………….. 7:12 am
Sunset this evening (09 September)………………………………. 7:43 pm
Sunrise tomorrow (10 September)…………………………………. 7:13 am
Sunset tomorrow (10 September)………………………………….. 7:42pm

Smaller More Focused Flash Flood Warning in NW Areas until 1145am (We/09Sep2020)

ALL / Austin, Travis County and South Central Texas Weather Update #2
Prepared by UT University/Incident Response Meteorologist Troy Kimmel
1050am CT – Friday / 09 September 2020

My Observations/Thoughts…
As I noted earlier today, given latest rainfall amounts, I am not concerned locally on the IH35 corridor at the current time with most ground truth rainfall in the immediate area generally less than an inch so far.. see map below..
My greatest immediate concern is for hill country well west/northwest of the IH35 corridor.
HOWEVER, please remember that there is more rainfall in the forecast with another couple of inches of rain possible; a Flash Flood WATCH remains in effect through tomorrow for the IH35 corridor counties and westward.. please remember, “Turn Around, Don’t Drown.”

Here are LCRA Hydromet rainfall amounts as of 1045am (since midnight)…
zzzzz

I’m continuing to monitor..
tk

… Authority / NWS Austin-San Antonio …

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BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
1041 AM CDT Wed Sep 9 2020

The National Weather Service in Austin/San Antonio has extended the

* Flash Flood Warning for...
  Northeastern Blanco County in south central Texas...
  Burnet County in south central Texas...
  Northwestern Hays County in south central Texas...
  Northwestern Travis County in south central Texas...
  Northwestern Williamson County in south central Texas...

* Until 1145 AM CDT.

* At 1041 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Austin, Cedar Park, Burnet, Marble Falls, Bertram, Round Mountain, 
  Leander, Lakeway, Lago Vista, Bee Cave, Granite Shoals, Horseshoe 
  Bay, Hudson Bend, The Hills, Meadowlakes, Liberty Hill, Oatmeal, 
  Smithwick, Shady Grove and Spicewood.



Reminders…
I encourage everyone to be weather aware. Know, in advance, the difference between a
NWS issued WATCH, ADVISORY and WARNING.