Alert archive / Texas / Winter Storm Watches in 2021

Winter Storm Watch 2, NWS Austin/San Antonio, TX

February 12, 202116 counties in Texas

NWS Austin/San Antonio, TX issued this winter storm watch at Feb 12, 2021, 3:20 PM CST for 16 counties in Texas. It took effect at Feb 14, 2021, 3:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued
Feb 12, 2021, 3:20 PM CST (21:20 UTC)
In effect from
Feb 14, 2021, 3:00 PM CST
Expired
Feb 13, 2021, 2:22 PM CST
In force
Issued by
NWS Austin/San Antonio, TX

Counties Atascosa County, TX, Bexar County, TX, DeWitt County, TX, Dimmit County, TX, Fayette County, TX, Frio County, TX, Gonzales County, TX, Guadalupe County, TX, Karnes County, TX, Kinney County, TX, Lavaca County, TX, Maverick County, TX, Medina County, TX, Uvalde County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 82 km from the middle of the area, began a volume at 21:21 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 9.3 hours before the alert went out and 203 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Corpus Christi, TX at 12:00Z on 2021-02-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 12:00Z on 2021-02-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
8 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
408 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

199 
WWUS44 KEWX 122120
WSWEWX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
320 PM CST Fri Feb 12 2021

TXZ171>173-183>194-206-208-131200-
/O.NEW.KEWX.WS.W.0003.210213T1200Z-210215T1800Z/
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Comal-Caldwell-
Including the cities of Llano, Burnet, Georgetown, Del Rio, 
Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, 
Blanco, San Marcos, Austin, Bastrop, Giddings, New Braunfels, 
and Lockhart
320 PM CST Fri Feb 12 2021

...WINTER STORM WARNING IN EFFECT FROM 6 AM SATURDAY TO NOON CST
MONDAY...

* WHAT...Light icing accumulations will be possible Saturday and 
  any icing on already frozen surfaces will quickly become 
  problematic. A more robust system will arrive Sunday afternoon 
  and Sunday night and bring total snow accumulations of 1 to 3 
  inches and ice accumulations of around one tenth of an inch. 

* WHERE...North of a Del Rio to New Braunfels to Giddings line.

* WHEN...From 6 AM Saturday to noon CST Monday.

* ADDITIONAL DETAILS...In addition to the wintry precipitation
  temperatures will drop into the single digits and teens Sunday
  night with wind chills near zero. These values can lead to
  hypothermia for anyone stranded within the icy roads expected.
  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state can be obtained at
drivetexas.org.

&&

$$

TXZ202>205-207-209-217>225-228-131200-
/O.NEW.KEWX.WS.A.0002.210214T2100Z-210215T1800Z/
Kinney-Uvalde-Medina-Bexar-Guadalupe-Fayette-Maverick-Zavala-Frio-
Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit-
Including the cities of Brackettville, Uvalde, Hondo, 
San Antonio, Seguin, La Grange, Eagle Pass, Crystal City, 
Pearsall, Pleasanton, Floresville, Karnes City, Gonzales, Cuero, 
Hallettsville, and Carrizo Springs
320 PM CST Fri Feb 12 2021

...WINTER STORM WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH
MONDAY MORNING...

* WHAT...Heavy mixed precipitation possible. Total snow 
  accumulations of up to two inches and ice accumulations of 
  around one tenth of an inch possible.

* WHERE...Portions of south central Texas.

* WHEN...From Sunday afternoon through Monday morning.

* ADDITIONAL DETAILS...In addition to the wintry precipitation
  temperatures will drop into the teens Sunday night with wind
  chills in the single digits. These values can lead to
  hypothermia for anyone stranded within the icy roads expected. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$
2 follow-up statements
345 
WWUS44 KEWX 131030
WSWEWX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
430 AM CST Sat Feb 13 2021

...MAJOR WINTER STORM TO IMPACT THE REGION SUNDAY THROUGH MONDAY 
MORNING...

.Bitterly cold air and wintry precipitation in the form of
freezing rain, sleet, and snow will impact the region Sunday
through Monday morning. The system could lead to major stress on 
the region's infrastructure as well as cripple travel. The coldest
temperatures since 1989 will impact the region.

TXZ202>205-207-209-223-132100-
/O.UPG.KEWX.WS.A.0002.210214T2100Z-210215T1800Z/
/O.EXA.KEWX.WS.W.0003.210213T1200Z-210215T1800Z/
Kinney-Uvalde-Medina-Bexar-Guadalupe-Fayette-Gonzales-
Including the cities of Brackettville, Uvalde, Hondo, 
San Antonio, Seguin, La Grange, and Gonzales
430 AM CST Sat Feb 13 2021

...WINTER STORM WARNING IN EFFECT UNTIL NOON CST MONDAY...

* WHAT...Light icing accumulations will be possible today through
  tonight and any icing on already frozen surfaces will quickly
  become problematic. A more robust system will arrive Sunday
  afternoon and Sunday night and bring total snow accumulations of
  1 to 3 inches, with isolated amounts up to 6 inches near and
  north of a Kerrville to La Grange line, and ice accumulations 
  of around 1/10 to 1/4 of an inch.

* WHERE...Near and north of a Del Rio to San Antonio to
  Schulenburg line.

* WHEN...From 6 AM Saturday to noon CST Monday.

* IMPACTS...Travel will be very difficult to near impossible
  across many areas late Sunday into Monday. Blowing snow in some
  areas could reduce visibility and snow may obscure ice
  underneath. Scattered power outages could occur, especially 
  across the Hill Country and Central Texas where ice still exists
  from earlier rounds of winter precipitation.

* ADDITIONAL DETAILS...Bitterly cold air will combine with gusty
  winds to produce wind wind chill values of -15 to 5 degrees 
  Monday morning. These values can lead to hypothermia for anyone 
  stranded within the icy roads expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state can be obtained at
drivetexas.org.

&&

$$

TXZ171>173-183>194-206-208-132100-
/O.CON.KEWX.WS.W.0003.210213T1200Z-210215T1800Z/
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Comal-Caldwell-
Including the cities of Llano, Burnet, Georgetown, Del Rio, 
Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, 
Blanco, San Marcos, Austin, Bastrop, Giddings, New Braunfels, 
and Lockhart
430 AM CST Sat Feb 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON CST MONDAY...

* WHAT...Light icing accumulations will be possible today through
  tonight and any icing on already frozen surfaces will quickly
  become problematic. A more robust system will arrive Sunday
  afternoon and Sunday night and bring total snow accumulations of
  1 to 3 inches, with isolated amounts up to 6 inches near and
  north of a Kerrville to La Grange line, and ice accumulations 
  of around 1/10 to 1/4 of an inch.

* WHERE...Near and north of a Del Rio to San Antonio to
  Schulenburg line.

* WHEN...From 6 AM Saturday to noon CST Monday.

* IMPACTS...Travel will be very difficult to near impossible
  across many areas late Sunday into Monday. Blowing snow in some
  areas could reduce visibility and snow may obscure ice
  underneath. Scattered power outages could occur, especially 
  across the Hill Country and Central Texas where ice still exists
  from earlier rounds of winter precipitation.

* ADDITIONAL DETAILS...Bitterly cold air will combine with gusty
  winds to produce wind wind chill values of -15 to 5 degrees 
  Monday morning. These values can lead to hypothermia for anyone 
  stranded within the icy roads expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state can be obtained at
drivetexas.org.

&&

$$

TXZ217>222-224-225-228-132100-
/O.CON.KEWX.WS.A.0002.210214T2100Z-210215T1800Z/
Maverick-Zavala-Frio-Atascosa-Wilson-Karnes-De Witt-Lavaca-Dimmit-
Including the cities of Eagle Pass, Crystal City, Pearsall, 
Pleasanton, Floresville, Karnes City, Cuero, Hallettsville, 
and Carrizo Springs
430 AM CST Sat Feb 13 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON
THROUGH MONDAY MORNING...

* WHAT...Light icing accumulations will be possible today through
  tonight. Heavy mixed precipitation is possible Sunday afternoon
  through Sunday night, with total snow accumulations of around
  1/2 to 1 inch and ice accumulations of around one tenth of an 
  inch possible.

* WHERE...Portions of south central Texas.

* WHEN...From Sunday afternoon through Monday morning.

* IMPACTS...Travel could become difficult across many areas late
  Sunday into Monday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$
840 
WWUS44 KEWX 132022
WSWEWX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
222 PM CST Sat Feb 13 2021

...MAJOR WINTER STORM TO IMPACT THE REGION THROUGH MONDAY 
MORNING...

.Bitterly cold air and wintry precipitation in the form of
freezing rain, sleet, and snow will impact the region Sunday
through Monday morning. The system could lead to major stress on
the region's infrastructure as well as cripple travel. The
coldest temperatures since 1989 will impact the region.

TXZ218>222-224-225-141000-
/O.UPG.KEWX.WS.A.0002.210214T2100Z-210215T1800Z/
/O.EXA.KEWX.WS.W.0003.000000T0000Z-210215T1800Z/
Zavala-Frio-Atascosa-Wilson-Karnes-De Witt-Lavaca-
Including the cities of Crystal City, Pearsall, Pleasanton, 
Floresville, Karnes City, Cuero, and Hallettsville
222 PM CST Sat Feb 13 2021

...WINTER STORM WARNING IN EFFECT UNTIL NOON CST MONDAY...

* WHAT...Light icing accumulations will be possible today through
  tonight and any icing will quickly become problematic. A more
  robust system will arrive Sunday afternoon and Sunday night and
  heavy mixed precipitation is expected. Snow accumulations of up
  to two inches and ice accumulations of around two tenths of an 
  inch are anticipated.

* WHERE...Portions of south central Texas.

* WHEN...Until noon CST Monday.

* ADDITIONAL DETAILS...Bitterly cold air will combine with gusty
  winds to produce wind wind chill values of 4 to 7 degrees 
  Monday morning. These values can lead to hypothermia for anyone 
  stranded within the icy roads expected.

* IMPACTS...Travel could become difficult across many areas late 
  Sunday into Monday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state can be obtained at
drivetexas.org.

&&

$$

TXZ171>173-183>194-202>209-223-141000-
/O.CON.KEWX.WS.W.0003.000000T0000Z-210215T1800Z/
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde-
Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Gonzales-
Including the cities of Llano, Burnet, Georgetown, Del Rio, 
Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, 
Blanco, San Marcos, Austin, Bastrop, Giddings, Brackettville, 
Uvalde, Hondo, San Antonio, New Braunfels, Seguin, Lockhart, 
La Grange, and Gonzales
222 PM CST Sat Feb 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON CST MONDAY...

* WHAT...Light icing accumulations will be possible today through
  tonight and any icing on already frozen surfaces will quickly
  become problematic. A more robust system will arrive Sunday
  afternoon and Sunday night and bring total snow accumulations of
  1 to 4 inches, with isolated amounts up to 6 inches near and 
  north of a Kerrville to La Grange line, and ice accumulations of
  around 1/10 to 1/4 of an inch.

* WHERE...Near and north of a Del Rio to San Antonio to 
  Schulenburg line.

* WHEN...From 6 AM Saturday to noon CST Monday.

* IMPACTS...Travel will be very difficult to near impossible 
  across many areas late Sunday into Monday. Blowing snow in 
  some areas could reduce visibility and snow may obscure ice 
  underneath. Scattered power outages could occur, especially 
  across the Hill Country and Central Texas where ice still 
  exists from earlier rounds of winter precipitation.

* ADDITIONAL DETAILS...Bitterly cold air will combine with gusty
  winds to produce wind wind chill values of -15 to 5 degrees 
  Monday morning. These values can lead to hypothermia for anyone 
  stranded within the icy roads expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state can be obtained at
drivetexas.org.

&&

$$

TXZ217-228-141000-
/O.UPG.KEWX.WS.A.0002.210214T2100Z-210215T1800Z/
/O.NEW.KEWX.WW.Y.0003.210214T2100Z-210215T1800Z/
Maverick-Dimmit-
Including the cities of Eagle Pass and Carrizo Springs
222 PM CST Sat Feb 13 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM SUNDAY TO NOON CST
MONDAY...

* WHAT...Mixed precipitation expected. Total snow accumulations 
  of up to one inch and ice accumulations of a light glaze.

* WHERE...Maverick and Dimmit Counties.

* WHEN...From 3 PM Sunday to noon CST Monday.

* ADDITIONAL DETAILS...Bitterly cold air will combine with gusty
  winds to produce wind wind chill values of 5 to 7 degrees Monday
  morning. These values can lead to hypothermia for anyone
  stranded within the icy roads expected. 

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state can be obtained at
drivetexas.org.

&&

$$

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 12, 3:20 PM CSTWinter Storm WarningEWXAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more69 hr

Nearby

Winter Storm Watches in Texas, 2021Every winter storm watch in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.