Alert archive / Alabama / Hard Freeze Warnings in 2022

Hard Freeze Warning 2, NWS Mobile, AL

December 21, 202212 counties in Alabama; Escambia County, Santa Rosa County, Florida; 5 counties in Mississippi

NWS Mobile, AL issued this hard freeze warning at Dec 21, 2022, 2:01 PM CST for 12 counties in Alabama; Escambia County, Santa Rosa County, Florida; 5 counties in Mississippi. It took effect at Dec 23, 2022, 12:00 AM CST. It was in force for 3 days. 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 21, 2022, 2:01 PM CST (20:01 UTC)
In effect from
Dec 23, 2022, 12:00 AM CST
Expired
Dec 26, 2022, 9:00 AM CST
In force
3 days
Issued by
NWS Mobile, AL

Counties Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 82 km from the middle of the area, began a volume at 20:01 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.0 hours before the alert went out and 220 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, Slidell Radar S, LA at 12:00Z on 2022-12-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2022-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.19395878Sfc1 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
4 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
490 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this hard freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this hard freeze warning went out at Dec 21, 11:21 AM CST, 2 hours 40 minutes earlier.

Area forecast discussion, Dec 21, 11:21 AM CST, 2 hours 40 minutes before
Area Forecast Discussion
National Weather Service Mobile AL
1121 AM CST Wed Dec 21 2022

...New AVIATION, NEAR TERM...

.AVIATION...
(18Z TAFS)
Issued at 1120 AM CST Wed Dec 21 2022

IFR/LIFR CIGs are expected to rise into low/mid MVFR levels this
afternoon, then fall back into IFR/LIFR levels this evening into
the overnight hours. Patchy light drizzle is possible this
afternoon, but is not expected to impact operations. North to
northeast winds around 10 knots this afternoon will fall into the
5-10 knots range tonight. Where winds fall to light levels, fog
development is possible. Am expecting VSBYs to remain at or above
IFR levels. Winds are expected to increase Thursday ahead of a
strong cold front passage Thursday night. CIGs rising to mid MVFR
levels by the end of the forecast are expected.
/16
&&

.NEAR TERM...
(Now through Thursday)
Issued at 1120 AM CST Wed Dec 21 2022

Have added patchy DZ to the forecast for the afternoon, with
reports coming in. Am not expecting any measurable accumulation.
No other changes at this time.
/16

&&

.MOB WATCHES/WARNINGS/ADVISORIES...
AL...Hard Freeze Watch from late Thursday night through Sunday
     morning for ALZ051>060-261-262.

     Hard Freeze Watch from Friday evening through Sunday morning for
     ALZ263>266.

     High Rip Current Risk until 6 PM CST this evening for ALZ265-266.

FL...Hard Freeze Watch from Friday evening through Sunday morning for
     FLZ201>206.

     High Rip Current Risk until 6 PM CST this evening for FLZ202-204-
     206.

MS...Hard Freeze Watch from late Thursday night through Sunday
     morning for MSZ067-075-076-078-079.

GM...Gale Watch from Thursday evening through Friday morning for
     GMZ630>636.

     Small Craft Advisory until noon CST today for GMZ650-655-670-675.

     Gale Watch from Thursday evening through Friday afternoon for
     GMZ650-655-670-675.

&&

This product is also available on the web at:
www.weather.gov/mob

In the hours before

Special weather statement, Dec 21, 8:03 AM CST, 5 hours 58 minutes before
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The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 21, 3:40 AM CSTHard Freeze WatchMOBBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more24 hr
Dec 21, 4:16 AM CSTGale WatchMOB10 hr
Dec 21, 2:28 PM CSTWind Chill AdvisoryMOBBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more68 hr
Dec 21, 2:31 PM CSTGale WarningMOB51 hr

Nearby

Hard Freeze Warnings in Alabama, 2022Hard Freeze Warnings in Mississippi, 2022Hard Freeze Warnings in Florida, 2022Every hard freeze warning in 2022

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.