Alert archive / Alabama / Fire Weather Watches in 2011

Fire Weather Watch 20, NWS Mobile, AL

April 5, 20117 counties in Alabama

NWS Mobile, AL issued this fire weather watch at Apr 5, 2011, 5:09 AM CDT for 7 counties in Alabama. It took effect at Apr 6, 2011, 12:00 PM CDT. It was in force for .

The area

The counties it named.

The facts

Issued
Apr 5, 2011, 5:09 AM CDT (10:09 UTC)
In effect from
Apr 6, 2011, 12:00 PM CDT
Expired
Apr 6, 2011, 6:27 AM CDT
In force
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

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 10.2 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 00:00Z on 2011-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 862 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2011-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 251 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
862 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1607 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
251 m²/s²
0-3 km storm-relative helicity
356 m²/s²
Significant tornado parameter
0.7
Supercell composite
9.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this fire weather watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this fire weather watch went out at Apr 4, 6:41 PM CDT, 10 hours 28 minutes earlier.

Area forecast discussion, Apr 4, 6:41 PM CDT, 10 hours 28 minutes before
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Hazardous weather outlook, Apr 4, 4:20 PM CDT, 12 hours 49 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE MOBILE AL
420 PM CDT MON APR 4 2011

ALZ051>064-FLZ001>006-GMZ630-650-655-670-675-MSZ067-075-076-078-
079-051830-
CHOCTAW-WASHINGTON-CLARKE-WILCOX-MONROE-CONECUH-BUTLER-CRENSHAW-
ESCAMBIA-COVINGTON-UPPER MOBILE-UPPER BALDWIN-LOWER MOBILE-
LOWER BALDWIN-INLAND ESCAMBIA-COASTAL ESCAMBIA-INLAND SANTA ROSA-
COASTAL SANTA ROSA-INLAND OKALOOSA-COASTAL OKALOOSA-MOBILE BAY-
COASTAL WATERS FROM PENSACOLA FL TO PASCAGOULA MS OUT 20 NM-
COASTAL WATERS FROM DESTIN TO PENSACOLA FL OUT 20 NM-
WATERS FROM PENSACOLA FL TO PASCAGOULA MS FROM 20 TO 60 NM-
WATERS FROM DESTIN TO PENSACOLA FL FROM 20 TO 60 NM-WAYNE-PERRY-
GREENE-STONE-GEORGE-
420 PM CDT MON APR 4 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL AND
SOUTHWEST ALABAMA...NORTHWEST FLORIDA AND SOUTHEAST MISSISSIPPI AND
THE COASTAL WATERS OF ALABAMA AND NORTHWEST FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SEVERE WEATHER IS LIKELY AS AN ORGANIZED SQUALL LINE MOVES IN FROM
THE WEST. THERE WILL BE A POTENTIAL OF SEVERE STORMS OVER SOUTHEAST
MISSISSIPPI AND EXTREME PORTIONS OF SOUTHWEST ALABAMA BEGINNING
AROUND 6 PM TO 7 PM THIS EVENING AS THE SQUALL LINE MOVES INTO THE
OUTLOOK AREA. THE SQUALL LINE WILL THEN ADVANCE EAST ACROSS THE
ENTIRE OUTLOOK AREA THROUGH 10 PM THIS EVENING...THEN EXIT THE
OUTLOOK AREA BY AROUND MIDNIGHT. THIS SPEED OF MOTION IS SLIGHTLY
FASTER THAN EARLIER INDICATED OVER THE EASTERN HALF OF THE AREA.
DATA STILL SUGGESTS THAT SEVERE THUNDERSTORMS WILL BE LIKELY ALONG
THIS LINE OF STORMS...WITH DAMAGING WINDS AND LARGE HAIL BEING THE
PRIMARY THREATS. IN ADVANCE OF THE LINE...ISOLATED THUNDERSTORM
CELLS MAY DEVELOP...AND SOME OF THESE STORMS WILL ALSO BE CAPABLE OF
PRODUCING DAMAGING WINDS...LARGE HAIL...AND ISOLATED TORNADOES.
THERE IS NOW A MODERATE RISK OF SEVERE THUNDERSTORMS THIS EVENING
OVER THE NORTHERN HALF OF THE FCST AREA...ROUGHLY ALONG AND NORTH OF
HIGHWAY 84...WITH A SLIGHT RISK OF SEVERE THUNDERSTORMS ELSEWHERE
ACROSS THE FCST AREA. THE SYSTEM WILL MOVE ACROSS THE REGION FAIRLY
RAPIDLY...AND AS SUCH WIDESPREAD HEAVY RAINFALL IS NOT EXPECTED.
RAINFALL TOTALS WILL GENERALLY RANGE FROM 1 TO 1.5 INCHES ACROSS
MOST OF THE REGION...WITH LOCALLY HIGHER AMOUNTS.

STRONG SOUTHERLY WINDS OVER THE COASTAL WATERS...WITH BUILDING SEAS
IN ADVANCE OF A STRONG COLD FRONT APPROACHING FROM THE NORTHWEST...
FOLLOWED BY A STRONG NORTHERLY WIND FLOW DEVELOPING AROUND MIDNIGHT
AND LASTING THROUGHOUT THE NIGHT IN THE WAKE OF THE FRONT. BAYS AND
COASTAL WATERWAYS WILL BE ROUGH...AND SEAS WILL BUILD TO 7 TO 9
FEET. THESE CONDITIONS WILL CREATE HAZARDOUS CONDITIONS TO SMALL
CRAFT. A GALE WARNING IS ALSO IN EFFECT FOR THE MARINE AREA DURING
THE OVERNIGHT TONIGHT.

A STRONG SOUTHERLY WIND FLOW ALONG WITH INCREASING SWELL AND TIDAL
RANGES WILL RESULT IN HIGH SURF ALONG THE GULF BEACHES...MINOR
COASTAL FLOODING...AND A HIGH RISK OF DANGEROUS RIP CURRENTS.

STRONG SOUTHERLY WINDS OF 20 TO 25 MPH...WITH FREQUENT GUSTS AS HIGH
AS 35 MPH WILL OCCUR OVER LAND AREAS IN ADVANCE OF AN APPROACHING
COLD FRONT. THESE STRONG GUSTY WINDS WILL POSE A HAZARD TO MOTORISTS
DRIVING HIGH PROFILE VEHICLES...AS WELL AS TO OTHERS IN OUTDOOR WIND
SENSITIVE ACTIVITIES. A WIND ADVISORY IS IN EFFECT THROUGH 10 PM
TONIGHT...PRIMARILY ALONG AND AHEAD OF THE FRONTAL BOUNDARY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

STRONG NORTHERLY WIND FLOW TUESDAY MORNING WILL DECREASING TO 15 TO
20 KNOTS BY EARLY TUESDAY AFTERNOON AS THE COLD FRONT MOVES AWAY FROM
THE AREA. BAYS AND COASTAL WATERWAYS WILL BE ROUGH...AND SEAS OF 7 TO
9 FEET WILL SUBSIDE BELOW 7 FEET EARLY TUESDAY AFTERNOON. THESE
CONDITIONS WILL CREATE HAZARDOUS CONDITIONS TO SMALL CRAFT.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL FOR
SEVERE WEATHER WILL BE REQUIRED BEGINNING AROUND MID AFTERNOON.

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 7:05 PM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke, Washington55 min
Apr 4, 7:08 PM CDTTornado WarningMOBChoctaw, Clarke, Washington67 min
Apr 4, 7:30 PM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke, Mobile, Washington, Wilcox60 min
Apr 4, 7:38 PM CDTTornado WarningMOBWashington56 min
Apr 4, 7:54 PM CDTTornado WarningMOBChoctaw, Clarke, Washington53 min
Apr 4, 8:21 PM CDTTornado WarningMOBClarke, Monroe, Washington39 min
Apr 4, 8:30 PM CDTSevere Thunderstorm WarningMOBBaldwin, Butler, Clarke, Conecuh, Escambia, Mobile and 3 more60 min
Apr 4, 9:41 PM CDTSevere Thunderstorm WarningMOBButler, Conecuh, Covington, Crenshaw, Escambia64 min
Apr 4, 9:44 PM CDTSevere Thunderstorm WarningMOBBaldwin, Covington, Escambia61 min
Apr 4, 9:47 PM CDTSpecial Marine WarningMOB88 min
Apr 4, 10:46 PM CDTSevere Thunderstorm WarningMOBCovington44 min
Apr 4, 11:36 PM CDTSpecial Marine WarningMOB84 min
Apr 4, 11:01 PM CDTTornado WarningMOBOkaloosa14 min
Apr 4, 11:30 PM CDTSevere Thunderstorm WarningMOBOkaloosa15 min

Nearby

Fire Weather Watches in Alabama, 2011Every fire weather watch 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.