Alert archive / Texas / Freeze Warnings in 2021

Freeze Warning 7, NWS Shreveport, LA

December 11, 20216 counties in Texas; 4 parishes in Louisiana

NWS Shreveport, LA issued this freeze warning at Dec 11, 2021, 2:28 PM CST for 6 counties in Texas; 4 parishes in Louisiana. It took effect at Dec 12, 2021, 12:00 AM 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, 2:28 PM CST (20:28 UTC)
In effect from: Dec 12, 2021, 12:00 AM CST
Expired: Dec 12, 2021, 9:00 AM CST
In force: 9 hr
Issued by: NWS Shreveport, LA

Counties Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Red River Parish, LA, Cherokee County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX

The radar

The Shreveport radar (KSHV), 55 km from the middle of the area, began a volume at 20:31 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

Shreveport, LA (KSHV), launched 12:00Z, 8.5 hours before the alert went out and 63 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1930 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: -266 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

795 
WWUS74 KSHV 112028
NPWSHV

URGENT - WEATHER MESSAGE
National Weather Service Shreveport LA
228 PM CST Sat Dec 11 2021

LAZ001-002-010-011-TXZ136-149>153-121500-
/O.NEW.KSHV.FZ.W.0007.211212T0600Z-211212T1500Z/
Caddo-Bossier-De Soto-Red River-Smith-Cherokee-Rusk-Panola-
Nacogdoches-Shelby-
Including the cities of Shreveport, Bossier City, Mansfield, 
Stonewall, Logansport, Coushatta, Martin, Tyler, Jacksonville, 
Rusk, Henderson, Carthage, Nacogdoches, and Center
228 PM CST Sat Dec 11 2021

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CST
SUNDAY...

* WHAT...Sub-freezing temperatures as low as 30 degrees are 
  expected.

* WHERE...In Louisiana, Caddo Parish, Bossier Parish, De Soto 
  Parish and Red River Parish. In Texas, Smith County, Cherokee 
  County, Rusk County, Panola County, Nacogdoches County and 
  Shelby County.

* WHEN...From midnight tonight to 9 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.

&&

$$

09

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 10, 6:15 PM CST	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Red River, Titus	60 min
Dec 10, 7:05 PM CST	Severe Thunderstorm Warning Considerable damage threat	SHV	Bowie, Red River	55 min
Dec 10, 10:06 PM CST	Special Weather Statement	SHV	Bowie	24 min
Dec 10, 10:20 PM CST	Severe Thunderstorm Warning	SHV	Bowie	55 min
Dec 10, 10:53 PM CST	Severe Thunderstorm Warning	SHV	Camp, Cass, Harrison, Marion, Morris, Titus and 1 more	67 min
Dec 10, 11:30 PM CST	Severe Thunderstorm Warning	SHV	Cass	45 min
Dec 10, 11:56 PM CST	Severe Thunderstorm Warning	SHV	Harrison, Marion	49 min
Dec 11, 2:16 AM CST	Special Weather Statement	SHV	Angelina	44 min
Dec 11, 2:45 AM CST	Special Weather Statement	SHV	Shelby	45 min
Dec 11, 4:02 AM CST	Special Weather Statement	SHV	Sabine	43 min
Dec 11, 12:09 AM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Claiborne, Webster	51 min
Dec 11, 1:15 AM CST	Special Weather Statement	SHV	Claiborne, Webster	45 min
Dec 11, 2:06 AM CST	Special Weather Statement	SHV	Union	24 min
Dec 11, 2:31 AM CST	Special Weather Statement	SHV	Lincoln	44 min
Dec 11, 4:44 AM CST	Special Weather Statement	SHV	Caldwell, Grant, LaSalle	61 min

Nearby

Freeze Warnings in Texas, 2021 Freeze Warnings in Louisiana, 2021 Every freeze warning 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.