Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 270, NWS Birmingham, AL

August 2, 2012Marion County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 2, 2012, 3:48 PM CDT for Marion County, Alabama. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 2, 2012, 3:48 PM CDT (20:48 UTC)
Expired: Aug 2, 2012, 4:30 PM CDT
In force: 42 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Marion County, AL

The radar

The Columbus AFB radar (KGWX), 56 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 128 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: 1483 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1379 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

409 
WUUS54 KBMX 022048
SVRBMX
ALC093-022130-
/O.NEW.KBMX.SV.W.0270.120802T2048Z-120802T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
348 PM CDT THU AUG 2 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MARION COUNTY IN NORTHWEST ALABAMA...

* UNTIL 430 PM CDT

* AT 349 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED NEAR BRILLIANT...OR 6 MILES NORTHEAST
  OF WINFIELD...AND MOVING EAST AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHEASTERN MARION COUNTY.

THIS INCLUDES...
US 78 EXIT NUMBERS 26 THROUGH 34...

WINDS OF 60 TO 70 MPH WILL BREAK LARGE TREE LIMBS AND CAUSE SOME
DAMAGE...ESPECIALLY TO SMALLER STRUCTURES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3412 8764 3392 8764 3391 8776 3392 8787
      3410 8787
TIME...MOT...LOC 2049Z 271DEG 8KT 3401 8774

$$

27

1 follow-up statement

904 
WWUS54 KBMX 022111
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
411 PM CDT THU AUG 2 2012

ALC093-022130-
/O.CON.KBMX.SV.W.0270.000000T0000Z-120802T2130Z/
MARION AL-
411 PM CDT THU AUG 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
MARION COUNTY UNTIL 430 PM CDT...

AT 406 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR BRILLIANT...OR 8 MILES NORTHEAST
OF WINFIELD...MOVING EAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...

THIS INCLUDES...
US 78 EXIT NUMBERS 26 THROUGH 34...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

TO REPORT SEVERE WEATHER...CALL 1-800-856-0758.

LAT...LON 3404 8774 3392 8765 3391 8775 3392 8787
      3410 8787
TIME...MOT...LOC 2111Z 271DEG 8KT 3401 8768

$$

56

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 7:13 PM CDT	Special Weather Statement	BMX	Chambers	47 min
Aug 2, 8:47 AM CDT	Areal Flood Advisory	BMX	Greene, Hale, Marengo, Perry, Sumter	3 hr
Aug 2, 9:58 AM CDT	Flash Flood Warning	BMX	Sumter	3 hr
Aug 2, 11:06 AM CDT	Special Weather Statement	BMX	Lowndes	39 min
Aug 2, 12:58 PM CDT	Areal Flood Warning	BMX	Sumter	3 hr
Aug 2, 12:58 PM CDT	Special Weather Statement	BMX	Coosa	47 min
Aug 2, 2:14 PM CDT	Areal Flood Advisory	BMX	Bullock, Macon, Montgomery	3 hr
Aug 2, 3:19 PM CDT	Special Weather Statement	BMX	Russell	41 min
Aug 2, 3:26 PM CDT	Special Weather Statement	BMX	Marion	49 min
Aug 2, 3:31 PM CDT	Areal Flood Advisory	BMX	Marion, Winston	3 hr
Aug 2, 4:30 PM CDT	Special Weather Statement	BMX	Lamar	45 min
Aug 2, 4:42 PM CDT	Flash Flood Warning	BMX	Marion, Winston	80 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every severe thunderstorm warning in 2012

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.