Alert archive / Alabama / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 247, NWS Birmingham, AL

June 21, 2006Chilton County, Shelby County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 21, 2006, 5:46 PM CDT for Chilton County, Shelby County, Alabama. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 21, 2006, 5:46 PM CDT (22:46 UTC)
Expired
Jun 21, 2006, 6:15 PM CDT
In force
29 min
Issued by
NWS Birmingham, AL
Area
Counties, with a storm outline in the text

Counties Chilton County, AL, Shelby County, AL

The radar

The Birmingham radar (KBMX), 15 km from the middle of the area, began a volume at 22:47 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, 10.8 hours before the alert went out and 16 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 2006-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 928 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 12:00Z on 2006-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 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
928 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1564 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
-6 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Birmingham, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 3:16 PM CDT, 2 hours 30 minutes earlier.

Area forecast discussion, Jun 21, 3:16 PM CDT, 2 hours 30 minutes before
AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE BIRMINGHAM AL
316 PM CDT WED JUN 21 2006

.SHORT TERM...(TONIGHT - FRIDAY NIGHT)

QUICKLY APPROACHING 100 DEGREES THIS AFTERNOON FOR SEVERAL AREAS
IN CENTRAL ALABAMA...IN FACT, BHM HAS OFFICIALLY REACHED THE
CENTURY MARK. A FEW ISOLATED THUNDERSTORMS OFFERING SOME RELIEF
BUT NOT MUCH COVERAGE WISE. CENTER OF UPPER LEVEL RIDGE WILL
SLOWLY EASE EASTWARD TOMORROW...TEMPERATURES WILL STILL CLIMB INTO
THE MID 90S WITH ISOLATED THUNDERSTORMS.

BY FRIDAY...THE UPPER RIDGE OVER THE SOUTHEAST BEGINS TO BREAK
DOWN AS AN EASTERN CONUS TROF STARTS SHAPING UP. BETTER MOISTURE
AND WEAKENING RIDGE SHOULD ALLOW FOR SCATTERED THUNDERSTORMS OVER
THE NORTH AND AT LEAST ISOLATED CHANCES OVER THE SOUTH...ON
FRIDAY...PERHAPS LINGERING INTO THE EVENING HOURS.

.LONG TERM...(SATURDAY - WEDNESDAY)

AS UPPER TROF BECOMES MORE ESTABLISHED ON SATURDAY...IT WILL PUSH
A WEAK SURFACE BOUNDARY INTO THE AREA AND ENHANCE THE CHANCE FOR
AFTERNOON AND EVENING THUNDERSTORMS FOR SEVERAL DAYS. WITH
INCREASED MOISTURE...TEMPERATURES WILL BE MUCH MORE TOLERABLE.

SOME NOTICEABLE MODEL DIFFERENCES IN THE EVOLUTION OF THE TROF BY
NEXT TUESDAY AND WEDNESDAY...BUT AT LEAST ISOLATED POPS ARE
WARRANTED WITH NEAR AVERAGE TEMPERATURES.

&&

.AVIATION...DISCUSSION FOR 18Z TAFS...
VFR CONDITIONS WILL BE EXPECTED FOR ALL TAF SITES IN THE 18Z PACKAGE.
MID LEVEL RIDGE ANCHORED ACROSS THE REGION THROUGH THE NEXT 24
HOURS. MOST CONVECTION WILL BE INHIBITED...BUT ISOLATED
THUNDERSTORMS WILL BE AROUND CENTRAL ALABAMA. THE CHANCES THAT ANY
TERMINAL WILL BE AFFECTED ARE SLIM AND WILL NOT BE MENTIONED AT THIS
TIME. CUMULUS FIELD WILL BE DEVELOPED BY AROUND THE 18Z ISSUANCE
TIME...WITH INITIAL DEVELOPMENT AROUND 3500FT. THE CLOUDS WILL LIFT
TO 6K OR 7K FEET BY 21Z. SURFACE DEW POINT DEPRESSIONS OVERNIGHT
WILL NOT BE CONDUCIVE TO FOG DEVELOPMENT. WINDS WILL GENERALLY BE
LIGHT AT 6 KNOTS OR LESS.

&&

.FIRE WEATHER...
SIMILAR CONCERNS JUST 24 HOURS LATER. KBDI VALUES INTO THE
CRITICAL RANGE...MINIMUM AFTERNOON RELATIVE HUMIDITY VALUES INTO
THE 30S...AND DRY ANTECEDENT SOIL CONDITIONS. WILL STICK WITH THE
IDEA THAT WINDS WILL BE THE LIMITED FACTOR...AS LIGHT WINDS OF 6
KNOTS OR LESS EXPECTED DURING SUNLIGHT HOURS. CAUTION SHOULD BE
EXERCISED DURING OUTDOOR BURNING ACTIVITIES.

&&

BMX WATCHES/WARNINGS/ADVISORIES...
AL...NONE.

&&

.PRELIMINARY POINT TEMPS/POPS...
GADSDEN     67  95  71  90 /  20  20  20  30
ANNISTON    70  96  71  91 /  20  20  20  30
BIRMINGHAM  72  95  74  90 /  20  20  20  30
TUSCALOOSA  72  96  71  92 /  20  20  20  30
CALERA      73  95  73  91 /  20  20  20  30
AUBURN      73  93  72  91 /  20  20  20  20
MONTGOMERY  72  95  72  93 /  20  20  20  20
TROY        70  93  71  93 /  20  20  20  20

&&

.BMX WATCHES/WARNINGS/ADVISORIES...
AL...NONE.

&&

88/88/75
Hazardous weather outlook, Jun 21, 1:30 PM CDT, 4 hours 16 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
130 PM CDT WED JUN 21 2006

ALZ011>015-017>050-221835-
AUTAUGA-BARBOUR-BIBB-BLOUNT-BULLOCK-CALHOUN-CHAMBERS-CHEROKEE-
CHILTON-CLAY-CLEBURNE-COOSA-DALLAS-ELMORE-ETOWAH-FAYETTE-GREENE-HALE-
JEFFERSON-LAMAR-LEE-LOWNDES-MACON-MARENGO-MARION-MONTGOMERY-PERRY-
PICKENS-PIKE-RANDOLPH-RUSSELL-SHELBY-ST CLAIR-SUMTER-TALLADEGA-
TALLAPOOSA-TUSCALOOSA-WALKER-WINSTON-
130 PM CDT WED JUN 21 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY
THE NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

ISOLATED STRONG THUNDERSTORMS WILL DEVELOP DURING THE AFTERNOON AND
EARLY EVENING HOURS. THESE STORMS WILL BE CAPABLE OF PRODUCING WIND
GUSTS OF 35 TO 45 MPH AND SMALL HAIL. ONE OR TWO STORMS MAY GROW
LARGE ENOUGH TO BECOME SEVERE...PRODUCING WINDS UP TO 60 MPH AND HAIL
TO THE SIZE OF NICKELS.

WET MICROBURST POTENTIAL:
BIRMINGHAM...HIGH.
MONTGOMERY...HIGH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL
IS NOT EXPECTED AT THIS TIME.

JONES/90

In the hours before

Special weather statement, Jun 21, 3:45 PM CDT, 2 hours 1 minute before
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Special weather statement, Jun 21, 4:03 PM CDT, 1 hour 43 minutes before
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Special weather statement, Jun 21, 4:09 PM CDT, 1 hour 37 minutes before
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Special weather statement, Jun 21, 4:22 PM CDT, 1 hour 24 minutes before
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Special weather statement, Jun 21, 5:13 PM CDT, 33 minutes before
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Special weather statement, Jun 21, 5:35 PM CDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 6:38 PM CDTFlash Flood WarningBMXJefferson82 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2006Every severe thunderstorm warning in 2006

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.