Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 331, NWS Birmingham, AL

June 24, 2011Marengo County, Sumter County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 24, 2011, 7:11 PM CDT for Marengo County, Sumter County, Alabama. It was in force for 34 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 24, 2011, 7:11 PM CDT (00:11 UTC)
Expired: Jun 24, 2011, 7:45 PM CDT
In force: 34 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Marengo County, AL, Sumter County, AL

The radar

The Birmingham radar (KBMX), 154 km from the middle of the area, began a volume at 00:11 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 was reported inside it

Time	Report	Where	Remark
Jun 24, 7:20 PM CDT	TSTM WND DMG	1 W Whitfield, AL	TREES DOWN ON COUNTY ROAD 42 NEAR DERBY

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 24, 1:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.2 hours before the alert went out and 154 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: 895 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1654 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

358 
WUUS54 KBMX 250011
SVRBMX
ALC091-119-250045-
/O.NEW.KBMX.SV.W.0331.110625T0011Z-110625T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
711 PM CDT FRI JUN 24 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL MARENGO COUNTY IN SOUTHWEST ALABAMA...
  SOUTHEASTERN SUMTER COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 745 PM CDT

* AT 711 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES NORTH OF
  INDIAN SPRINGS...OR 13 MILES SOUTHEAST OF YORK...AND MOVING EAST AT
  15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  JEFFERSON...MYRTLEWOOD AND WHITFIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

&&

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

LAT...LON 3244 8815 3243 8788 3217 8797 3220 8802
      3226 8801 3227 8803 3229 8803 3230 8801
      3230 8819 3232 8822
TIME...MOT...LOC 0011Z 285DEG 14KT 3237 8812

$$

19

2 follow-up statements

494 
WWUS54 KBMX 250032
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
732 PM CDT FRI JUN 24 2011

ALC091-119-250045-
/O.CON.KBMX.SV.W.0331.000000T0000Z-110625T0045Z/
MARENGO AL-SUMTER AL-
732 PM CDT FRI JUN 24 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
SUMTER AND NORTHWESTERN MARENGO COUNTIES UNTIL 745 PM CDT...

AT 732 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
JEFFERSON...OR 11 MILES WEST OF LINDEN...MOVING EAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  JEFFERSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURE'S LEADING KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

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

LAT...LON 3230 8801 3230 8810 3244 8808 3243 8788
      3226 8794
TIME...MOT...LOC 0032Z 285DEG 14KT 3236 8796

$$

19

003 
WWUS54 KBMX 250042
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
742 PM CDT FRI JUN 24 2011

ALC091-119-250053-
/O.EXP.KBMX.SV.W.0331.000000T0000Z-110625T0045Z/
MARENGO AL-SUMTER AL-
742 PM CDT FRI JUN 24 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUMTER AND
NORTHWESTERN MARENGO COUNTIES WILL EXPIRE AT 745 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.

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

LAT...LON 3230 8801 3230 8810 3244 8808 3243 8788
      3226 8794
TIME...MOT...LOC 0043Z 285DEG 14KT 3235 8791

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 7:07 PM CDT	Special Weather Statement	BMX	Autauga, Chambers, Elmore, Lee, Lowndes, Macon and 2 more	38 min
Jun 24, 7:39 PM CDT	Special Weather Statement	BMX	Marengo	51 min
Jun 25, 4:35 AM CDT	Dense Fog Advisory	BMX	Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 3 more	3 hr
Jun 25, 5:15 PM CDT	Special Weather Statement	BMX	Shelby	30 min
Jun 25, 5:32 PM CDT	Special Weather Statement	BMX	Shelby	28 min
Jun 25, 5:53 PM CDT	Areal Flood Advisory	BMX	Jefferson	3 hr
Jun 25, 5:56 PM CDT	Special Weather Statement	BMX	Shelby	34 min
Jun 25, 5:59 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	31 min
Jun 25, 6:25 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	50 min
Jun 25, 6:31 PM CDT	Special Weather Statement	BMX	Tuscaloosa	44 min
Jun 25, 6:33 PM CDT	Flash Flood Warning	BMX	Jefferson, Shelby	3 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.