Alert archive / Alabama / Frost Advisories in 2021
Frost Advisory 4, NWS Mobile, AL
NWS Mobile, AL issued this frost advisory at Nov 23, 2021, 1:40 PM CST for Okaloosa County, Santa Rosa County, Florida; 7 counties in Alabama. It took effect at Nov 24, 2021, 12:00 AM CST. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Nov 23, 2021, 1:40 PM CST (19:40 UTC)
- In effect from
- Nov 24, 2021, 12:00 AM CST
- Expired
- Nov 24, 2021, 7:00 AM CST
- In force
- 7 hr
- Issued by
- NWS Mobile, AL
Counties Butler County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Monroe County, AL, Wilcox County, AL, Okaloosa County, FL, Santa Rosa County, FL
The radar
The Eglin Afb radar (KEVX), 127 km from the middle of the area, began a volume at 19:41 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
Birmingham, AL (KBMX), launched 12:00Z, 7.7 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2901 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- -144 m²/s²
- 0-3 km storm-relative helicity
- -72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
994 WWUS74 KMOB 231940 NPWMOB URGENT - WEATHER MESSAGE National Weather Service Mobile AL 140 PM CST Tue Nov 23 2021 ALZ054>060-240345- /O.NEW.KMOB.FR.Y.0004.211124T0600Z-211124T1200Z/ Wilcox-Monroe-Conecuh-Butler-Crenshaw-Escambia-Covington- Including the cities of Camden, Pine Hill, Homewood, Monroeville, Evergreen, Greenville, Brantley, Luverne, Atmore, Brewton, Flomaton, Andalusia, and Opp 140 PM CST Tue Nov 23 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM CST WEDNESDAY... * WHAT...Low temperatures in the 33 to 37 degree range, wet bulb temperatures just below freezing, light winds and clear skies could result in frost formation. * WHERE...Wilcox, Monroe, Conecuh, Butler, Crenshaw, Escambia and Covington Counties. * WHEN...From midnight tonight to 6 AM CST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
2 follow-up statements
732 WWUS74 KMOB 232024 AAA NPWMOB URGENT - WEATHER MESSAGE...UPDATED National Weather Service Mobile AL 224 PM CST Tue Nov 23 2021 FLZ203-205-240430- /O.EXA.KMOB.FR.Y.0004.211124T0600Z-211124T1200Z/ Santa Rosa Inland-Okaloosa Inland- Including the cities of Jay, Milton, and Crestview 224 PM CST Tue Nov 23 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM CST WEDNESDAY... * WHAT...Low temperatures in the 33 to 37 degree range, wet bulb temperatures just below freezing, light winds and clear skies could result in frost formation. * WHERE...Santa Rosa Inland and Okaloosa Inland Counties. * WHEN...From midnight tonight to 6 AM CST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ ALZ054>060-240430- /O.CON.KMOB.FR.Y.0004.211124T0600Z-211124T1200Z/ Wilcox-Monroe-Conecuh-Butler-Crenshaw-Escambia-Covington- Including the cities of Camden, Pine Hill, Homewood, Monroeville, Evergreen, Greenville, Brantley, Luverne, Atmore, Brewton, Flomaton, Andalusia, and Opp 224 PM CST Tue Nov 23 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM CST WEDNESDAY... * WHAT...Low temperatures in the 33 to 37 degree range, wet bulb temperatures just below freezing, light winds and clear skies could result in frost formation. * WHERE...Crenshaw, Escambia, Wilcox, Monroe, Conecuh, Butler and Covington Counties. * WHEN...From midnight tonight to 6 AM CST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
781 WWUS74 KMOB 240238 NPWMOB URGENT - WEATHER MESSAGE National Weather Service Mobile AL 838 PM CST Tue Nov 23 2021 ALZ054>060-FLZ203-205-241100- /O.EXT.KMOB.FR.Y.0004.211124T0600Z-211124T1300Z/ Wilcox-Monroe-Conecuh-Butler-Crenshaw-Escambia-Covington- Santa Rosa Inland-Okaloosa Inland- Including the cities of Camden, Pine Hill, Homewood, Monroeville, Evergreen, Greenville, Brantley, Luverne, Atmore, Brewton, Flomaton, Andalusia, Opp, Jay, Milton, and Crestview 838 PM CST Tue Nov 23 2021 ...FROST ADVISORY NOW IN EFFECT FROM MIDNIGHT TONIGHT TO 7 AM CST WEDNESDAY... * WHAT...Temperatures in the 33 to 37 degree range along with light winds and clear skies will favor frost formation. * WHERE...In Alabama, Crenshaw, Escambia, Wilcox, Monroe, Conecuh, Butler and Covington Counties. In Florida, Okaloosa Inland and Santa Rosa Inland Counties. * WHEN...From midnight tonight to 7 AM CST Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 22, 7:06 PM CST | Gale Warning | MOB | 9 hr | |
| Nov 22, 7:06 PM CST | Small Craft Advisory | MOB | 114 min |
Nearby
Frost Advisories in Alabama, 2021Frost Advisories in Florida, 2021Every frost advisory 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.