Alert archive / Texas / Freeze Warnings in 2021
Freeze Warning 1, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this freeze warning at Dec 11, 2021, 1:52 PM CST for 25 counties in Texas. It took effect at Dec 11, 2021, 11:00 PM CST. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 11, 2021, 1:52 PM CST (19:52 UTC)
- In effect from
- Dec 11, 2021, 11:00 PM CST
- Expired
- Dec 12, 2021, 8:00 AM CST
- In force
- 9 hr
- Issued by
- NWS Austin/San Antonio, TX
All 25 counties
Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Dimmit County, TX, Edwards County, TX, Gillespie County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lee County, TX, Llano County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Williamson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 83 km from the middle of the area, began a volume at 19:55 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
Del Rio, TX (KDRT), launched 12:00Z, 7.9 hours before the alert went out and 196 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3017 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- -186 m²/s²
- 0-3 km storm-relative helicity
- -137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
246 WWUS74 KEWX 111952 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 152 PM CST Sat Dec 11 2021 TXZ171>173-184>192-206-120400- /O.NEW.KEWX.FZ.W.0001.211212T0700Z-211212T1400Z/ Llano-Burnet-Williamson-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Hays-Travis-Comal- Including the cities of Llano, Burnet, Georgetown, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Blanco, San Marcos, Austin, and New Braunfels 152 PM CST Sat Dec 11 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 8 AM CST SUNDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Portions of south central Texas. * WHEN...From 1 AM to 8 AM CST Sunday. * IMPACTS...Frost and freeze conditions will kill or damage crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Pipes and in ground sprinkler systems should be fine since temperatures will only fall below freezing by a few degrees for a few hours. You can always be on the safe side by wrapping exposed pipes or draining water lines before the freezing conditions arrive. && $$
3 follow-up statements
948 WWUS74 KEWX 120441 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 1041 PM CST Sat Dec 11 2021 TXZ171>173-184>192-206-121400- /O.CON.KEWX.FZ.W.0001.211212T0700Z-211212T1400Z/ Llano-Burnet-Williamson-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Hays-Travis-Comal- Including the cities of Llano, Burnet, Georgetown, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Blanco, San Marcos, Austin, and New Braunfels 1041 PM CST Sat Dec 11 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM CST SUNDAY... * WHAT...Sub-freezing temperatures as low as 27 expected. * WHERE...Portions of south central Texas. * WHEN...Until 8 AM CST Sunday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$
503 WWUS74 KEWX 120453 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 1053 PM CST Sat Dec 11 2021 TXZ171>173-184>192-206-121400- /O.EXT.KEWX.FZ.W.0001.211212T0500Z-211212T1400Z/ Llano-Burnet-Williamson-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Hays-Travis-Comal- Including the cities of Llano, Burnet, Georgetown, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Blanco, San Marcos, Austin, and New Braunfels 1053 PM CST Sat Dec 11 2021 ...FREEZE WARNING NOW IN EFFECT UNTIL 8 AM CST SUNDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Portions of south central Texas. * WHEN...Until 8 AM CST Sunday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$
760 WWUS74 KEWX 121151 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 551 AM CST Sun Dec 12 2021 TXZ183-193-194-202>205-207-208-217-218-228-121400- /O.EXA.KEWX.FZ.W.0001.000000T0000Z-211212T1400Z/ Val Verde-Bastrop-Lee-Kinney-Uvalde-Medina-Bexar-Guadalupe- Caldwell-Maverick-Zavala-Dimmit- Including the cities of Del Rio, Bastrop, Giddings, Brackettville, Uvalde, Hondo, San Antonio, Seguin, Lockhart, Eagle Pass, Crystal City, and Carrizo Springs 551 AM CST Sun Dec 12 2021 ...FREEZE WARNING IN EFFECT UNTIL 8 AM CST THIS MORNING... * WHAT...Sub-freezing temperatures as low as 30. * WHERE...Portions of south central Texas. * WHEN...Until 8 AM CST Sunday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Some areas inside the city of San Antonio, Del Rio, and other cities and towns will likely stay above freezing. Outlying areas, rural areas, and typical cold spots will likely drop below the freezing mark. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ TXZ171>173-184>192-206-121400- /O.CON.KEWX.FZ.W.0001.000000T0000Z-211212T1400Z/ Llano-Burnet-Williamson-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Hays-Travis-Comal- Including the cities of Llano, Burnet, Georgetown, Rocksprings, Leakey, Kerrville, Bandera, Fredericksburg, Boerne, Blanco, San Marcos, Austin, and New Braunfels 551 AM CST Sun Dec 12 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM CST THIS MORNING... * WHAT...Sub-freezing temperatures as low as the mid to upper 20s can be expected. * WHERE...Portions of south central Texas. * WHEN...Until 8 AM CST Sunday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Some low spots may drop into the lower 20s in the western Hill Country. Some interior sections of the city of Austin may stay above freezing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$
Nearby
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.