Alert archive / Alabama / Red Flag Warnings in 2011

Red Flag Warning 18, NWS Mobile, AL

March 24, 201110 counties in Alabama

NWS Mobile, AL issued this red flag warning at Mar 24, 2011, 2:37 PM CDT for 10 counties in Alabama. It was in force for 3 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
Mar 24, 2011, 2:37 PM CDT (19:37 UTC)
Expired
Mar 24, 2011, 6:00 PM CDT
In force
3 hr
Issued by
NWS Mobile, AL

Counties Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL

The radar

The Mobile radar (KMOB), 138 km from the middle of the area, began a volume at 19:36 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, 7.6 hours before the alert went out and 182 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, Birmingham, AL at 12:00Z on 2011-03-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Birmingham, AL at 12:00Z on 2011-03-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -196 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1777 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
-196 m²/s²
0-3 km storm-relative helicity
3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

544 
WWUS84 KMOB 241937
RFWMOB

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOBILE AL
237 PM CDT THU MAR 24 2011

...RED FLAG WARNING NOW IN EFFECT FOR THE REST OF THIS AFTERNOON FOR
SOUTHWEST ALABAMA FOR VERY LOW HUMIDITY VALUES...

.A VERY DRY AIRMASS COMBINED WITH VERY WARM TEMPERATURES HAS ALLOWED
RELATIVE HUMIDITY VALUES TO DROP WELL BELOW 25 PERCENT THIS AFTERNOON

ALZ051>064-242300-
/O.NEW.KMOB.FW.W.0018.110324T1937Z-110324T2300Z/
CHOCTAW-WASHINGTON-CLARKE-WILCOX-MONROE-CONECUH-BUTLER-CRENSHAW-
ESCAMBIA-COVINGTON-UPPER MOBILE-UPPER BALDWIN-LOWER MOBILE-
LOWER BALDWIN-
237 PM CDT THU MAR 24 2011

...RED FLAG WARNING IN EFFECT UNTIL 6 PM CDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT UNTIL 6 PM CDT THIS EVENING. 

RELATIVE HUMIDITY VALUES HAVE FALLEN BELOW 25 PERCENT OVER SOUTHWEST
ALABAMA AND ARE EXPECTED TO BOTTOM OUT IN THE 15 TO 20 PERCENT RANGE
OVER MOST OF THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY.
 A COMBINATION OF LOW RELATIVE HUMIDITY...AND DRY FUELS WILL
CREATE RAPID FIRE GROWTH POTENTIAL.

&&

$$

Nearby

Red Flag Warnings in Alabama, 2011Every red flag warning 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.