Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 389, NWS Birmingham, AL

July 13, 2009Dallas County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 13, 2009, 9:21 AM CDT for Dallas County, Alabama. It was in force for 39 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 13, 2009, 9:21 AM CDT (14:21 UTC)
Expired: Jul 13, 2009, 10:00 AM CDT
In force: 39 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Dallas County, AL

The radar

The Birmingham radar (KBMX), 99 km from the middle of the area, began a volume at 14:22 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.

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 13, 7:05 AM CDT, 2 hours 16 minutes earlier.

Area forecast discussion, Jul 13, 7:05 AM CDT, 2 hours 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
705 AM CDT MON JUL 13 2009

.UPDATED...AVIATION DISCUSSION.

&&

.DISCUSSION...

A STORMY MORNING IS EXPECTED TO CONTINUE ACROSS MUCH OF CENTRAL
ALABAMA AS SEVERAL STORM CLUSTERS MOVE THROUGH THE AREA. ONE
CLUSTER CONTINUES TO MOVE SOUTHWARD HEADING TOWARDS THE MONTGOMERY
AND TROY AREA. A SECOND AND MUCH STRONGER CLUSTER OF STORMS
DEVELOPED OVER WESTERN TENNESSEE AND ARE NOW MOVING QUICKLY
TOWARDS OUR AREA. CURRENT THINKING IS THAT MUCH OF CENTRAL ALABAMA
SHOULD SEE STORM ACTIVITY LASTING AT LEAST AROUND NOON AND BEGIN
TO DECREASE THROUGH THE LATE AFTERNOON HOURS. THE MAIN THREAT WITH
THESE STORMS WILL BE STRONG DAMAGING WINDS AND AN INTENSE AMOUNT
OF LIGHTNING.

UNFORTUNATELY...IT APPEARS THAT THIS STORMY PATTERN WILL CONTINUE
AS A NORTHWEST FLOW ALOFT REMAINS IN PLACE FOR MUCH OF THE
FORECAST PERIOD. UPPER LEVEL DISTURBANCES COULD RIDE ALONG THIS
FLOW AT ANY TIME WHICH IN TURN COULD HELP TRIGGER MCS ACTIVITY.

COMPUTER MODELS DO A GOOD JOB RECOGNIZING THE PATTERN...BUT THEY
DONT DO SO WELL IN DETECTING WHEN AND WHERE THESE SYSTEMS WILL
DEVELOP AND MOVE TO. THEY ARE BEST HANDLED A DAY AT A TIME. AS A
RESULT...WILL KEEP POPS IN THE FORECAST AT LEAST THROUGH SATURDAY
AND WILL HANDLE ANY THREATS TO THE CWA ON A DAILY BASIS.

LONG RANGE MODELS CONTINUE TO SHOW A FAIRLY STRONG COLD FRONT THAT
WILL MOVE THROUGH THE AREA LATE FRIDAY INTO SATURDAY. THIS COULD
ENHANCE THE THREAT OF STRONG OR SEVERE STORMS ON BOTH DAYS IN
COMBINATION WITH THE UPPER LEVEL PATTERN. DRIER CONDITIONS COULD
RETURN ON SUNDAY ALONG WITH MILDER TEMPERATURES ASSUMING THE COLD
FRONT PUSHES THROUGH THE ENTIRE AREA.

10/ARM

&&

.AVIATION...12Z TAF DISCUSSION.

NUMEROUS SHWRS AND TSTMS WILL MOVE SOUTHWARD ACROSS CENTRAL ALABAMA
THIS MORNING.  THE ACTIVITY SHOULD SHIFT WESTWARD AND WEAKEN BY 18Z
AS THE AIR MASS STABILIZES FROM THE MORNING RAINFALL.  TSTMS WITH
FREQUENT LIGHTNING WILL AFFECT KBHM...KEET...KTCL THRU 15Z...WITH
VCTS AT OTHER TAF SITES.  PREVAILING CIGS WILL BE MVFR THRU 18Z BUT
IFR CONDS LIKELY IN AND NEAR TSTMS WITH VSBYS AOB 1 MILE. EXPECT VFR
CONDS AT ALL TAF SITES BY 20Z WITH THE POSSIBLE EXCEPTION OF TCL
WHERE TSTMS MAY LINGER A WHILE LONGER.

GENERALLY LIGHT AND VRBL WINDS THIS MORNING WILL BECOME NW AT 8-10
KNOTS AS A SURFACE BOUNDARY SHIFTS SOUTHWARD TO NEAR A CBM...TO
BHM...TO AUB LINE. FOG MAY NEED TO ADDRESSED IN LATER FORECASTS FOR
LATER TONIGHT AS SKIES CLEAR AND WIND BECOME LIGHT.

58/ROSE

&&

.PRELIMINARY POINT TEMPS/POPS...
GADSDEN     89  66  92  67  90 /  60  10  20  10  30
ANNISTON    90  69  94  71  92 /  60  10  20  10  30
BIRMINGHAM  91  71  94  75  90 /  60  20  20  10  30
TUSCALOOSA  95  72  96  75  93 /  60  20  20  10  30
CALERA      91  72  93  74  90 /  60  20  20  10  30
AUBURN      90  70  91  71  91 /  60  10  20  10  20
MONTGOMERY  93  73  95  74  95 /  60  20  30  10  20
TROY        92  71  93  72  94 /  60  20  40  20  20

&&

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

&&

Hazardous weather outlook, Jul 13, 5:15 AM CDT, 4 hours 6 minutes before

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In the hours before

Special weather statement, Jul 13, 5:48 AM CDT, 3 hours 33 minutes before

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Special weather statement, Jul 13, 6:38 AM CDT, 2 hours 43 minutes before

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Local storm report, Jul 13, 7:56 AM CDT, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
756 AM CDT MON JUL 13 2009

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

0715 AM     TSTM WND DMG     CAHABA HEIGHTS          33.46N 86.73W
07/13/2009                   JEFFERSON          AL   FIRE DEPT/RESCUE

            ONE TREE DOWN WHICH FELL ON POWER LINES NEAR LIBERTY
            PARK.

&&

ARM

Special weather statement, Jul 13, 8:32 AM CDT, 49 minutes before

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Special weather statement, Jul 13, 9:10 AM CDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 7:01 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	119 min
Jul 13, 1:07 AM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah, St. Clair	23 min
Jul 13, 1:27 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Etowah, St. Clair	33 min
Jul 13, 1:38 AM CDT	Flash Flood Warning	BMX	Blount, Calhoun, Cherokee, Cleburne, Etowah, St. Clair	3 hr
Jul 13, 7:28 AM CDT	Areal Flood Advisory	BMX	Bibb, Chilton, Jefferson, Shelby, Tuscaloosa, Walker	2 hr
Jul 13, 7:45 AM CDT	Flash Flood Warning	BMX	Jefferson	3 hr
Jul 13, 7:53 AM CDT	Flash Flood Warning	BMX	Jefferson	3 hr
Jul 13, 7:54 AM CDT	Flash Flood Warning	BMX	Shelby	109 min
Jul 13, 8:52 AM CDT	Flash Flood Warning	BMX	Autauga	113 min
Jul 13, 9:02 AM CDT	Flash Flood Warning	BMX	Montgomery	87 min
Jul 13, 11:03 AM CDT	Areal Flood Advisory	BMX	Dallas	117 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; radar from the NEXRAD Level II archive.