Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 133, NWS Birmingham, AL

May 20, 2012Lamar County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at May 20, 2012, 5:32 PM CDT for Lamar County, Alabama. It was in force for 28 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: May 20, 2012, 5:32 PM CDT (22:32 UTC)
Expired: May 20, 2012, 6:00 PM CDT
In force: 28 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Lamar County, AL

The radar

The Columbus AFB radar (KGWX), 19 km from the middle of the area, began a volume at 22:32 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
May 20, 5:43 PM CDT	TSTM WND DMG	2 Wsw Detroit, AL	ONE TREE DOWN ALONG HATLEY-DETROIT ROAD...AND ANOTHER TREE DOWN NEAR THE FIRE DEPT ON HWY 17. NUMEROUS POWER OUTAGES IN AND AROUND DETROIT...INCLUDING AREAS WEST AND SOUTHWEST OF THE CITY.

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

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.5 hours before the alert went out and 155 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1865 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 18 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.

667 
WUUS54 KBMX 202232
SVRBMX
ALC075-202300-
/O.NEW.KBMX.SV.W.0133.120520T2232Z-120520T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
532 PM CDT SUN MAY 20 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LAMAR COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 600 PM CDT

* AT 530 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR
  DETROIT...OR 9 MILES SOUTHWEST OF HAMILTON...AND MOVING SOUTH AT 10
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  SULLIGENT...DETROIT...CREWS...BEAVERTON...HENSON SPRINGS AND PINE
  SPRINGS.

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 3392 8823 3400 8822 3402 8822 3406 8821
      3405 8799 3403 8799 3387 8802 3390 8824
TIME...MOT...LOC 2233Z 021DEG 8KT 3405 8810

$$

MA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 2:46 PM CDT	Special Weather Statement	BMX	Pickens	44 min
May 20, 3:07 PM CDT	Special Weather Statement	BMX	Lamar	38 min
May 20, 3:44 PM CDT	Special Weather Statement	BMX	Lamar	46 min
May 20, 3:50 PM CDT	Special Weather Statement	BMX	Pickens	40 min
May 20, 4:19 PM CDT	Special Weather Statement	BMX	Marion	26 min
May 20, 4:30 PM CDT	Special Weather Statement	BMX	Fayette	45 min
May 20, 4:32 PM CDT	Special Weather Statement	BMX	Pickens	43 min
May 20, 4:39 PM CDT	Special Weather Statement	BMX	Marion	51 min
May 20, 4:45 PM CDT	Special Weather Statement	BMX	Greene	45 min
May 20, 5:07 PM CDT	Special Weather Statement	BMX	Greene	38 min
May 20, 5:10 PM CDT	Severe Thunderstorm Warning	BMX	Lamar, Marion	35 min
May 20, 5:37 PM CDT	Special Weather Statement	BMX	Marion	53 min
May 20, 5:43 PM CDT	Severe Thunderstorm Warning	BMX	Marion	32 min
May 20, 6:14 PM CDT	Special Weather Statement	BMX	Marion	46 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.