Alert archive / Alabama / Red Flag Warnings in 2012
Red Flag Warning 9, NWS Huntsville, AL
NWS Huntsville, AL issued this red flag warning at Apr 9, 2012, 4:02 AM CDT for 4 counties in Alabama. It took effect at Apr 9, 2012, 1:00 PM CDT. It was in force for 6 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
- Apr 9, 2012, 4:02 AM CDT (09:02 UTC)
- In effect from
- Apr 9, 2012, 1:00 PM CDT
- Expired
- Apr 9, 2012, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS Huntsville, AL
Counties DeKalb County, AL, Jackson County, AL, Madison County, AL, Marshall County, AL
The radar
The Northeast Alabama radar (KHTX), 38 km from the middle of the area, began a volume at 09:00 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 00:00Z, 9.0 hours before the alert went out and 167 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
- 2175 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- -29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
989 WWUS84 KHUN 090902 RFWHUN URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE HUNTSVILLE AL 402 AM CDT MON APR 9 2012 ALZ006-008>010-100000- /O.NEW.KHUN.FW.W.0009.120409T1800Z-120410T0000Z/ MADISON-MARSHALL-JACKSON-DEKALB- 402 AM CDT MON APR 9 2012 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING FOR LOW HUMIDITY ACROSS NORTHEAST ALABAMA... THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING. * AFFECTED AREA: MADISON...MARSHALL...JACKSON...AND DEKALB COUNTIES. * TIMING: FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING. * RELATIVE HUMIDITY: VALUES ARE EXPECTED TO DROP TO BETWEEN 20 TO 25 PERCENT. * IMPACTS: THE DRY AIRMASS IN PLACE ACROSS THE REGION WILL RESULT 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. && $$
2 follow-up statements
935 WWUS84 KHUN 091809 AAA RFWHUN URGENT - FIRE WEATHER MESSAGE...UPDATED NATIONAL WEATHER SERVICE HUNTSVILLE AL 109 PM CDT MON APR 9 2012 ALZ006-008>010-100000- /O.CON.KHUN.FW.W.0009.000000T0000Z-120410T0000Z/ MADISON-MARSHALL-JACKSON-DEKALB- 109 PM CDT MON APR 9 2012 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR LOW HUMIDITY ACROSS NORTHEAST ALABAMA... * AFFECTED AREA: MADISON...MARSHALL...JACKSON...AND DEKALB COUNTIES. * TIMING: FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING. * RELATIVE HUMIDITY: VALUES ARE EXPECTED TO DROP TO BETWEEN 20 TO 25 PERCENT. * IMPACTS: THE DRY AIRMASS IN PLACE ACROSS THE REGION WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. LOW RELATIVE HUMIDITY OVER A PROLONGED PERIOD WILL INCREASE FIRE GROWTH POTENTIAL. && $$ TT
195 WWUS84 KHUN 100001 RFWHUN URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE HUNTSVILLE AL 701 PM CDT MON APR 9 2012 ...RED FLAG WARNING WILL EXPIRE AT 7 PM CDT THIS EVENING FOR NORTHEAST ALABAMA... ALZ006-008>010-100115- /O.EXP.KHUN.FW.W.0009.000000T0000Z-120410T0000Z/ MADISON-MARSHALL-JACKSON-DEKALB- 701 PM CDT MON APR 9 2012 ...RED FLAG WARNING WILL EXPIRE AT 7 PM CDT THIS EVENING FOR NORTHEAST ALABAMA... ALTHOUGH SOME PORTIONS OF JACKSON AND DEKALB COUNTIES MAY STILL EXPERIENCE SUBCRITICAL RELATIVE HUMIDITY VALUES BETWEEN 7 AND 730 PM CDT...LOCAL SURFACE OBSERVATIONS INDICATE THAT RELATIVE HUMIDITY VALUES ARE RISING OUT OF THE 20 TO 25 PERCENT RANGE ACROSS NORTHEASTERN ALABAMA. THIS TREND IS EXPECTED TO CONTINUE INTO THE EVENING AS AIR TEMPERATURES COOL...AND THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE ON SCHEDULE AT 7 PM CDT. $$ 70/DD
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.