Alert archive / Alabama / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 118, NWS Birmingham, AL

July 23, 20135 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 23, 2013, 2:00 PM CDT for 5 counties in Alabama. It was in force for 60 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 23, 2013, 2:00 PM CDT (19:00 UTC)
Expired: Jul 23, 2013, 3:00 PM CDT
In force: 60 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Greene County, AL, Hale County, AL, Marengo County, AL, Perry County, AL, Sumter County, AL

The radar

The Birmingham radar (KBMX), 112 km from the middle of the area, began a volume at 19:01 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
Jul 23, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 7.0 hours before the alert went out and 112 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: 1182 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 535 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.8

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 23, 12:53 PM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jul 23, 12:53 PM CDT, 1 hour 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1253 PM CDT TUE JUL 23 2013

.UPDATE...
FOR 18Z AVIATION.

&&

.DISCUSSION...

FEATURE ONE WAS AN OUTFLOW BOUNDARY LOCATED GENERALLY FROM AUBURN
TO MONTGOMERY TO EUTAW. SHOWERS AND THUNDERSTORMS CONTINUE ALONG
THIS BOUNDARY FROM WETUMPKA TO ROANOKE. THIS ACTIVITY WILL CONTINUE
EAST SOUTHEAST TOWARD TUSKEGEE AUBURN AND PHENIX CITY THIS
MORNING. A SECONDARY OUTFLOW BOUNDARY WAS LOCATED FROM THE
BIRMINGHAM METRO TOWARD HEFLIN. THUNDERSTORMS WERE ALSO DEVELOPING
ALONG THIS AXIS. AN UPPER LEVEL DISTURBANCE WAS MOVING ACROSS
NORTHERN ALABAMA THIS MORNING AND THIS WAS THE INITIATOR OF THE
CONVECTION. ADDITIONAL STORMS WILL AFFECT AREAS FROM ONEONTA TO
CENTRE ASSOCIATED WITH THIS FEATURE ALOFT.

FEATURE TWO WAS AN AREA OF CLEARING SKIES AND INSOLATION NORTH AND
WEST OF I-65/I-20. THUNDERSTORMS ARE INITIATING IN THIS AREA TOO
AS INSTABILITIES ARE INCREASING.

ANOTHER UPPER LEVEL DISTURBANCE IN THE NORTHWEST FLOW ALOFT WAS
LOCATED OVER THE LOWER MISSISSIPPI VALLEY AND WAS PRODUCING STORMS
ACROSS NORTHERN MISSISSIPPI AND INTO ARKANSAS AND TENNESSEE. THIS
FEATURE WILL SWING INTO WESTERN ALABAMA AROUND NOON.
THEREFORE...EXPECT A FEW ROUNDS OF THUNDERSTORMS THROUGH THE EARLY
EVENING HOURS ACROSS MUCH OF CENTRAL ALABAMA.

THE 12Z AREA RAOBS AND THE SATELLITE DEPICTION INDICATE HIGH
PRECIP WATER OVER MUCH OF THE AREA AGAIN TODAY...IN SOME
INSTANCES...OVER 2 INCHES. BULK SHEAR IS NOT IMPRESSIVE BUT A
DEVELOPING COLD POOL IN NORTHERN MISSISSIPPI SHOULD ALLOW SOME
STORM ORGANIZATION AND REGENERATION ALONG WITH THE UPPER SUPPORT.
MID LEVEL LAPSE RATES ARE A BIT BETTER THAN YESTERDAY WITH
INSTABILITY VALUES NEARLY THE SAME. THEREFORE...WENT AHEAD AND
ADDED THE LOCALIZED CHANCE OF FLASH FLOODING AND WIND GUSTS 35 TO
60 MPH IN THE HWO THROUGH 10 PM AREA WIDE.

STAY TUNED FOR FURTHER UPDATES AND BE PREPARED FOR THE ISSUANCE OF
A FEW WARNINGS TODAY.

75

&&

.AVIATION...
18Z TAF DISCUSSION.

YET ANOTHER LINE OF THUNDERSTORMS WILL IMPACT MUCH OF CENTRAL
ALABAMA THUS AFTERNOON AS A TROPICAL AIRMASS REMAINS IN PLACE OVER
THE AREA. AS OF 18Z... THIS LINE STRETCHES FROM NEAR GWO TO GTR TO
JFX... MOVING SOUTH/SOUTHEAST. TRIED MY BEST TO TIME OUT TSRA FOR
BHM... EET... AND TCL. WILL PROBABLY HAVE TO DO A FEW AMENDMENTS
THROUGH THE AFTERNOON AS STORMS WILL LIKELY IMPACT ALL TAF SITES
AT SOME POINT BEFORE SUNSET.

LIKE YESTERDAY... SHOWERS AND THUNDERSTORMS SHOULD DIMINISH IN
COVERAGE AND INTENSITY THIS EVENING AND OVERNIGHT. WITH ALL THE
RECENT RAINFALL... EXPECTING SOME PATCHY FOG OVERNIGHT FOR MOST
SITES IF CLOUDS CAN CLEAR OUT.

77/GLEASON

&&

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

&&

75/77

Hazardous weather outlook, Jul 23, 12:58 PM CDT, 1 hour 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1258 PM CDT TUE JUL 23 2013

ALZ011>015-017>050-241800-
MARION-LAMAR-FAYETTE-WINSTON-WALKER-BLOUNT-ETOWAH-CALHOUN-CHEROKEE-
CLEBURNE-PICKENS-TUSCALOOSA-JEFFERSON-SHELBY-ST. CLAIR-TALLADEGA-
CLAY-RANDOLPH-SUMTER-GREENE-HALE-PERRY-BIBB-CHILTON-COOSA-TALLAPOOSA-
CHAMBERS-MARENGO-DALLAS-AUTAUGA-LOWNDES-ELMORE-MONTGOMERY-MACON-
BULLOCK-LEE-RUSSELL-PIKE-BARBOUR-
1258 PM CDT TUE JUL 23 2013

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

.DAY ONE...TODAY AND TONIGHT.

ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED ACROSS CENTRAL ALABAMA
THIS AFTERNOON AND EVENING. SOME AREAS MAY EXPERIENCE HEAVY RAINFALL
LEADING TO LOCALIZED FLASH FLOODING. ADDITIONALLY... SOME OF THE
THUNDERSTORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS UP TO 60 MPH.
THE ACTIVITY SHOULD LOSE SOME INTENSITY BY 10 PM.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT MAY BE NEEDED
THROUGH THIS EVENING DUE TO SEVERE WEATHER.

In the hours before

Local storm report, Jul 23, 12:42 PM CDT, 1 hour 18 minutes before

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Special weather statement, Jul 23, 1:11 PM CDT, 49 minutes before

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Local storm report, Jul 23, 1:16 PM CDT, 44 minutes before

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Special weather statement, Jul 23, 1:34 PM CDT, 26 minutes before

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Local storm report, Jul 23, 1:41 PM CDT, 19 minutes before

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Local storm report, Jul 23, 1:59 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
159 PM CDT TUE JUL 23 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0155 PM     FLASH FLOOD      5 ESE FULTONDALE        33.59N 86.71W
07/23/2013                   JEFFERSON          AL   PUBLIC

            MINOR FLOODING REPORTED IN THE ROEBUCK AREA.

&&

AA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 4:44 AM CDT	Special Weather Statement	BMX	Fayette, Lamar, Marion	46 min
Jul 23, 5:14 AM CDT	Special Weather Statement	BMX	Walker, Winston	61 min
Jul 23, 5:28 AM CDT	Special Weather Statement	BMX	Fayette	47 min
Jul 23, 6:16 AM CDT	Special Weather Statement	BMX	Jefferson	44 min
Jul 23, 10:53 AM CDT	Areal Flood Advisory	BMX	Etowah	112 min
Jul 23, 10:56 AM CDT	Special Weather Statement	BMX	Marion	64 min
Jul 23, 11:12 AM CDT	Severe Thunderstorm Warning	BMX	Lamar, Marion	48 min
Jul 23, 11:26 AM CDT	Special Weather Statement	BMX	Fayette	49 min
Jul 23, 11:41 AM CDT	Flash Flood Warning	BMX	Fayette, Lamar, Marion, Winston	3 hr
Jul 23, 12:07 PM CDT	Special Weather Statement	BMX	Fayette, Lamar, Walker, Winston	53 min
Jul 23, 12:16 PM CDT	Severe Thunderstorm Warning	BMX	Fayette	44 min
Jul 23, 12:33 PM CDT	Special Weather Statement	BMX	Pickens, Tuscaloosa	57 min
Jul 23, 12:44 PM CDT	Severe Thunderstorm Warning	BMX	Tuscaloosa, Walker	61 min
Jul 23, 1:11 PM CDT	Special Weather Statement	BMX	Jefferson	64 min
Jul 23, 1:29 PM CDT	Areal Flood Advisory	BMX	Blount, Jefferson, Pickens, St. Clair, Tuscaloosa, Walker	3 hr
Jul 23, 1:34 PM CDT	Special Weather Statement	BMX	Greene, Hale, Sumter	56 min
Jul 23, 1:58 PM CDT	Areal Flood Advisory	BMX	Bibb, Greene, Hale, Jefferson, St. Clair, Shelby and 3 more	2 hr
Jul 23, 2:09 PM CDT	Special Weather Statement	BMX	Bibb, Chilton, Coosa, Shelby, Talladega	66 min
Jul 23, 2:25 PM CDT	Areal Flood Advisory	BMX	Bibb, Chilton, Clay, Coosa, Hale, Marengo and 3 more	2 hr
Jul 23, 2:30 PM CDT	Flash Flood Warning	BMX	Blount, Jefferson, St. Clair	3 hr
Jul 23, 2:59 PM CDT	Areal Flood Advisory	BMX	Autauga, Chilton, Clay, Coosa, Dallas, Marengo and 2 more	2 hr
Jul 23, 3:01 PM CDT	Special Weather Statement	BMX	Autauga, Chambers, Clay, Dallas, Elmore, Lowndes and 2 more	59 min
Jul 23, 3:14 PM CDT	Flash Flood Warning	BMX	Montgomery	3 hr
Jul 23, 3:27 PM CDT	Areal Flood Advisory	BMX	Autauga, Clay, Coosa, Dallas, Elmore, Lowndes and 2 more	2 hr
Jul 23, 3:38 PM CDT	Severe Thunderstorm Warning	BMX	Elmore	52 min
Jul 23, 3:58 PM CDT	Special Weather Statement	BMX	Bullock, Chambers, Lee, Macon, Montgomery, Pike	62 min
Jul 23, 4:10 PM CDT	Areal Flood Advisory	BMX	Barbour, Bullock, Chambers, Lee, Macon, Montgomery and 3 more	2 hr
Jul 23, 4:33 PM CDT	Severe Thunderstorm Warning	BMX	Macon	42 min
Jul 23, 4:56 PM CDT	Special Weather Statement	BMX	Barbour, Lee, Russell	64 min
Jul 23, 5:23 PM CDT	Severe Thunderstorm Warning	BMX	Russell	37 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2013 Every severe thunderstorm warning in 2013

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.