Alert archive / Alabama / Frost Advisories in 2011
Frost Advisory 2, NWS Mobile, AL
NWS Mobile, AL issued this frost advisory at Oct 21, 2011, 2:15 PM CDT for 8 counties in Alabama; Greene County, Perry County, Wayne County, Mississippi. It took effect at Oct 22, 2011, 2:00 AM CDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Oct 21, 2011, 2:15 PM CDT (19:15 UTC)
- In effect from
- Oct 22, 2011, 2:00 AM CDT
- Expired
- Oct 22, 2011, 8:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS Mobile, AL
Counties Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Crenshaw County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Greene County, MS, Perry County, MS, Wayne County, MS
The radar
The Mobile radar (KMOB), 112 km from the middle of the area, began a volume at 19:16 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, 7.3 hours before the alert went out and 198 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
- 1290 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
583 WWUS74 KMOB 211915 NPWMOB URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MOBILE AL 215 PM CDT FRI OCT 21 2011 ...PATCHY FROST EXPECTED OVER INTERIOR SOUTHEAST MISSISSIPPI AND SOUTHWEST ALABAMA LATE TONIGHT... .AN UNSEASONABLY COLD AIRMASS CONTINUES OVER THE AREA THROUGH TONIGHT ...AND WHEN COMBINED WITH LIGHT WINDS...WILL ALLOW TEMPERATURES TO AGAIN FALL INTO THE THIRTIES OVER MOST OF THE REGION. TEMPERATURES ARE EXPECTED TO FALL LOW ENOUGH FOR FROST TO FORM ALONG AND NORTH OF A LINE FROM NEW AUGUSTA...MISSISSIPPI TO LUVERNE...ALABAMA. ALZ051>058-MSZ067-075-076-220315- /O.NEW.KMOB.FR.Y.0002.111022T0700Z-111022T1300Z/ CHOCTAW-WASHINGTON-CLARKE-WILCOX-MONROE-CONECUH-BUTLER-CRENSHAW- WAYNE-PERRY-GREENE- INCLUDING THE CITIES OF...BUTLER...LISMAN...SILAS...CHATOM... MILLRY...JACKSON...THOMASVILLE...GROVE HILL...CAMDEN... PINE HILL...HOMEWOOD...MONROEVILLE...GREENVILLE...LUVERNE... BRANTLEY...WAYNESBORO...RICHTON...BEAUMONT...NEW AUGUSTA...MCLAIN 215 PM CDT FRI OCT 21 2011 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM CDT SATURDAY... THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 8 AM CDT SATURDAY. * EVENT...PATCHY FROST OVER INLAND AREAS GENERALLY NORTH OF A LINE FROM NEW AUGUSTA MISSISSIPPI TO EVERGREEN ALABAMA TO LUVERNE ALABAMA. * TIMING...PATCHY FROST DEVELOPS AFTER 4 AM AND DISSIPATES SHORTLY AFTER SUNRISE SATURDAY. * IMPACT...PATCHY FROST WILL AGAIN BE A PROBLEM FOR SENSITIVE PLANTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED OR SUFFER FROST BURN IF LEFT UNCOVERED. && $$
1 follow-up statement
347 WWUS74 KMOB 220254 NPWMOB URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MOBILE AL 954 PM CDT FRI OCT 21 2011 ...PATCHY FROST EXPECTED OVER INTERIOR SOUTHEAST MISSISSIPPI AND SOUTHWEST ALABAMA LATE TONIGHT... .AN UNSEASONABLY COLD AIRMASS WILL CONTINUE OVER THE AREA THROUGH TONIGHT ...AND WHEN COMBINED WITH LIGHT WINDS...WILL ALLOW TEMPERATURES TO AGAIN FALL INTO THE MID TO UPPER 30S OVER MOST OF THE ADVISED AREA. TEMPERATURES AT A FEW LOCATIONS WILL POSSIBLY DROP INTO THE LOWER 30S. TEMPERATURES ARE EXPECTED TO FALL LOW ENOUGH FOR FROST TO FORM ALONG AND NORTH OF A LINE FROM NEAR NEW AUGUSTA MISSISSIPPI TO NEAR LUVERNE ALABAMA. ALZ051>058-MSZ067-075-076-221300- /O.CON.KMOB.FR.Y.0002.111022T0700Z-111022T1300Z/ CHOCTAW-WASHINGTON-CLARKE-WILCOX-MONROE-CONECUH-BUTLER-CRENSHAW- WAYNE-PERRY-GREENE- INCLUDING THE CITIES OF...BUTLER...LISMAN...SILAS...CHATOM... MILLRY...JACKSON...THOMASVILLE...GROVE HILL...CAMDEN... PINE HILL...HOMEWOOD...MONROEVILLE...GREENVILLE...LUVERNE... BRANTLEY...WAYNESBORO...RICHTON...BEAUMONT...NEW AUGUSTA...MCLAIN 954 PM CDT FRI OCT 21 2011 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT SATURDAY... * EVENT...PATCHY FROST OVER INLAND AREAS GENERALLY NORTH OF A LINE FROM NEW AUGUSTA MISSISSIPPI TO EVERGREEN ALABAMA TO LUVERNE ALABAMA. * TIMING...PATCHY FROST WILL DEVELOP AFTER 4 AM AND SHOULD DISSIPATE SHORTLY AFTER SUNRISE SATURDAY MORNING. * IMPACT...THE PATCHY FROST WILL BE A PROBLEM FOR SENSITIVE PLANTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED OR SUFFER FROST BURN IF LEFT UNCOVERED. && $$
Nearby
Frost Advisories in Alabama, 2011Frost Advisories in Mississippi, 2011Every frost advisory in 2011
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.