Alert archive / Alabama / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 291, NWS Birmingham, AL

July 20, 2006Cherokee County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 20, 2006, 1:56 PM CDT for Cherokee County, Alabama. It was in force for 24 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: Jul 20, 2006, 1:56 PM CDT (18:56 UTC)
Expired: Jul 20, 2006, 2:20 PM CDT
In force: 24 min
Issued by: NWS Birmingham, AL
Area: Counties, with a storm outline in the text

County Cherokee County, AL

The radar

The Northeast Alabama radar (KHTX), 95 km from the middle of the area, began a volume at 18:57 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 6.9 hours before the alert went out and 136 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 674 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 1286 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: -26 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 Jul 20, 12:25 PM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, Jul 20, 12:25 PM CDT, 1 hour 31 minutes before

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Hazardous weather outlook, Jul 20, 12:45 PM CDT, 1 hour 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1245 PM CDT THU JUL 20 2006

ALZ011>015-017>050-211800-
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-
1245 PM CDT THU JUL 20 2006

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED THUNDERSTORMS ARE EXPECTED AGAIN THIS AFTERNOON AND
EVENING. SOME OF THESE COULD REACH SEVERE LIMITS PRODUCING LARGE
HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THE THUNDERSTORMS ARE
EXPECTED TO BE MOST NUMEROUS EAST OF THE INTERSTATE 65 CORRIDOR.

BESIDES THE STORMS...HIGH TEMPERATURES IN THE MID TO UPPER 90S ARE
EXPECTED ACROSS CENTRAL ALABAMA THIS AFTERNOON.  THESE TEMPERATURES
COMBINED WITH MODERATE HUMIDITY VALUES WILL MAKE IT FEEL BETWEEN 100
AND 109 DEGREES.

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

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

HIGH TEMPERATURES AND HEAT INDICES OF 100 TO 107 DEGREES ARE EXPECTED
AGAIN ON FRIDAY...AS WELL AS THE POTENTIAL FOR WET MICROBURSTS IN
ISOLATED THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Jul 20, 9:28 AM CDT, 4 hours 28 minutes before

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Local storm report, Jul 20, 9:30 AM CDT, 4 hours 26 minutes before

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Local storm report, Jul 20, 9:33 AM CDT, 4 hours 23 minutes before

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Nearby

Severe Thunderstorm Warnings in Alabama, 2006 Every 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.