Alert archive / Alabama / Red Flag Warnings in 2012
Red Flag Warning 4, NWS Huntsville, AL
NWS Huntsville, AL issued this red flag warning at Feb 11, 2012, 2:43 PM CST for 11 counties in Alabama. It took effect at Feb 12, 2012, 11:00 AM CST. It was in force for 4 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
- Feb 11, 2012, 2:43 PM CST (20:43 UTC)
- In effect from
- Feb 12, 2012, 11:00 AM CST
- Expired
- Feb 12, 2012, 2:35 PM CST
- In force
- 4 hr
- Issued by
- NWS Huntsville, AL
Counties Colbert County, AL, Cullman County, AL, DeKalb County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL
The radar
The Northeast Alabama radar (KHTX), 85 km from the middle of the area, began a volume at 20:47 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, 8.7 hours before the alert went out and 156 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
- 1 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 621 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- -89 m²/s²
- 0-3 km storm-relative helicity
- -48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
052 WWUS84 KHUN 112043 RFWHUN URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE HUNTSVILLE AL 243 PM CST SAT FEB 11 2012 ALZ001>010-016-130000- /O.UPG.KHUN.FW.A.0003.120212T1800Z-120213T0000Z/ /O.NEW.KHUN.FW.W.0004.120212T1700Z-120213T0000Z/ LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN- MARSHALL-JACKSON-DEKALB-CULLMAN- 243 PM CST SAT FEB 11 2012 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 6 PM CST SUNDAY FOR ALL FIRE WEATHER ZONES IN NORTHERN ALABAMA FOR 4 OR MORE CONSECUTIVE HOURS OF RELATIVE HUMIDITY AT OR BELOW 25 PERCENT... THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT FROM 11 AM TO 6 PM CST SUNDAY. THIS WARNING REPLACES THE FIRE WEATHER WATCH THAT WAS PREVIOUSLY IN EFFECT. * AFFECTED AREAS: LAUDERDALE...COLBERT...FRANKLIN AL...LAWRENCE... LIMESTONE...MADISON...MORGAN...MARSHALL...JACKSON...DEKALB... AND CULLMAN COUNTIES. * TIMING: SUNDAY AFTERNOON. * RELATIVE HUMIDITY: VALUES WILL FALL INTO THE 20-25 PERCENT RANGE FOR AROUND FIVE HOURS ON SUNDAY AFTERNOON. * IMPACTS: A DRY ARCTIC AIR MASS WILL PERSIST ACROSS NORTHERN ALABAMA ON SUNDAY...RESULTING IN CRITICAL FIRE WEATHER CONDITIONS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. LOW RELATIVE HUMIDITY OVER A PROLONGED PERIOD WILL INCREASE FIRE GROWTH POTENTIAL. && $$ 70/DD
2 follow-up statements
461 WWUS84 KHUN 121155 RFWHUN URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE HUNTSVILLE AL 555 AM CST SUN FEB 12 2012 ALZ001>010-016-130000- /O.CON.KHUN.FW.W.0004.120212T1700Z-120213T0000Z/ LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN- MARSHALL-JACKSON-DEKALB-CULLMAN- 555 AM CST SUN FEB 12 2012 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 6 PM CST THIS EVENING FOR LOW HUMIDITY FOR ALL OF NORTHERN ALABAMA... * AFFECTED AREAS: LAUDERDALE...COLBERT...FRANKLIN AL... LAWRENCE...LIMESTONE...MADISON...MORGAN...MARSHALL... JACKSON...DEKALB... AND CULLMAN COUNTIES. * TIMING: MAINLY THIS AFTERNOON. * RELATIVE HUMIDITY: VALUES WILL FALL WELL BELOW 25 PERCENT FOR AT LEAST FOUR HOURS OR MORE LATER TODAY. * IMPACTS: A DRY ARCTIC AIR MASS WILL PERSIST ACROSS NORTHERN ALABAMA TODAY...RESULTING IN CRITICAL FIRE WEATHER CONDITIONS. LOW RELATIVE HUMIDITY VALUES ARE AGAIN POSSIBLE ON MONDAY BEFORE GULF MOISTURE INCREASES ACROSS THE REGION MONDAY NIGHT AND TUESDAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. LOW RELATIVE HUMIDITY OVER A PROLONGED PERIOD WILL INCREASE FIRE GROWTH POTENTIAL. && $$
977 WWUS84 KHUN 122035 RFWHUN URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE HUNTSVILLE AL 235 PM CST SUN FEB 12 2012 ...RED FLAG WARNING IS CANCELLED FOR ALL COUNTIES IN NORTHERN ALABAMA... ALZ001>010-016-122145- /O.CAN.KHUN.FW.W.0004.000000T0000Z-120213T0000Z/ LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN- MARSHALL-JACKSON-DEKALB-CULLMAN- 235 PM CST SUN FEB 12 2012 ...RED FLAG WARNING IS CANCELLED FOR ALL COUNTIES IN NORTHERN ALABAMA... THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS CANCELLED THE RED FLAG WARNING THAT WAS PREVIOUSLY IN EFFECT FOR ALL COUNTIES ACROSS NORTHERN ALABAMA. AFTERNOON TEMPERATURES HAVE STRUGGLED TO WARM INTO THE MID 30S...LIMITING MINIMUM RELATIVE HUMIDITY VALUES TO THE 25-30 PERCENT RANGE IN ONLY A FEW LOCATIONS. RELATIVE HUMIDITY VALUES WILL SLOWLY INCREASE THROUGH LATE THIS AFTERNOON AS TEMPERATURES BEGIN TO FALL ONCE AGAIN. $$ 70/DD
The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 11, 9:56 AM CST | Wind Advisory | HUN | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 8 hr |
Nearby
Red Flag Warnings in Alabama, 2012Every red flag warning in 2012
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.