Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 351, NWS Birmingham, AL

June 28, 2009Etowah County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 28, 2009, 1:20 PM CDT for Etowah County, Alabama. It was in force for 40 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 28, 2009, 1:20 PM CDT (18:20 UTC)
Expired: Jun 28, 2009, 2:00 PM CDT
In force: 40 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Etowah County, AL

The radar

The Northeast Alabama radar (KHTX), 99 km from the middle of the area, began a volume at 18:19 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 28, 12:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 6.3 hours before the alert went out and 118 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: 1554 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1178 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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 28, 12:32 PM CDT, 48 minutes earlier.

Area forecast discussion, Jun 28, 12:32 PM CDT, 48 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1232 PM CDT SUN JUN 28 2009

.UPDATE...FOR 18Z AVIATION.

&&

.DISCUSSION...

MOIST AND UNSTABLE AIR MASS REMAINS IN PLACE.  FRONT
WILL SLOWLY APPROACH THROUGH THE AFTERNOON.  CONVECTIVE TEMP
JUST BEING REACHED AT MOST LOCATIONS.  CURRENT FORECAST LOOKS FINE
WITH ONLY SOME MINOR ADJUSTMENTS TO SKY CONDITION.

&&

.AVIATION...18Z TAF DISCUSSION.

STRONG HEATING AHEAD OF AN APPROACHING SURFACE BOUNDARY FROM THE
NORTH WILL INITIATE ISOLATED TO SCATTERED THUNDERSTORMS ACROSS
CENTRAL ALABAMA TODAY. AMENDMENTS MAY BE NECESSARY IF STORM
DEVELOPMENT BECOMES MORE WIDESPREAD. STORMS SHOULD WEAKEN FROM
NORTH TO SOUTH THROUGH THE EVENING (00Z TO 06Z) AS DRIER AIR
PUSHES IN FROM THE NORTH.

&&

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

&&

50/88

Hazardous weather outlook, Jun 28, 12:32 PM CDT, 48 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1232 PM CDT SUN JUN 28 2009

ALZ011>015-017>050-291739-
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-
1232 PM CDT SUN JUN 28 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

STRONG TO SEVERE STORMS ARE POSSIBLE THROUGH AROUND 10 PM TONIGHT
AS A COLD FRONT MOVES ACROSS THE STATE. ISOLATED TO SCATTERED STORMS
WILL DEVELOP DURING THE PEAK HEATING HOURS AND MAY FORM A LINE.
THE SEVERE THREAT WILL INCLUDE THE ENTIRE COUNTY WARNING AREA.
THE MAIN THREAT WITH THESE STORMS WILL BE WIND GUSTS UP TO
60 MPH WITH A LESSER CHANCE OF LARGE HAIL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT MAY BE NEEDED
SUNDAY EVENING.

KSL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 2:15 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair, Talladega	45 min
Jun 28, 2:17 PM CDT	Severe Thunderstorm Warning	BMX	Cleburne	13 min
Jun 28, 2:44 PM CDT	Severe Thunderstorm Warning	BMX	Cleburne, Randolph	21 min
Jun 28, 2:49 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Talladega	26 min
Jun 28, 3:58 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Tuscaloosa	17 min
Jun 28, 4:22 PM CDT	Severe Thunderstorm Warning	BMX	Chambers	23 min
Jun 28, 4:47 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Lee, Tallapoosa	43 min
Jun 28, 4:50 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton	29 min
Jun 28, 4:54 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah	36 min
Jun 28, 5:23 PM CDT	Severe Thunderstorm Warning	BMX	Lee, Russell	32 min
Jun 28, 5:29 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah, St. Clair	31 min
Jun 28, 5:43 PM CDT	Areal Flood Advisory	BMX	Montgomery	2 hr
Jun 28, 5:51 PM CDT	Severe Thunderstorm Warning	BMX	Coosa, Elmore	39 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2009 Every severe thunderstorm warning in 2009

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.