Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 302, NWS Birmingham, AL

June 18, 2011Blount County, Etowah County, St. Clair County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 18, 2011, 4:02 PM CDT for Blount County, Etowah County, St. Clair County, Alabama. It was in force for 27 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
Jun 18, 2011, 4:02 PM CDT (21:02 UTC)
Expired
Jun 18, 2011, 4:29 PM CDT
In force
27 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon

Counties Blount County, AL, Etowah County, AL, St. Clair County, AL

The radar

The Northeast Alabama radar (KHTX), 103 km from the middle of the area, began a volume at 21:04 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, 9.0 hours before the alert went out and 105 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2011-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2470 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2011-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2470 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
604 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

Open this sounding in Storm Lab

The text

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

711 
WUUS54 KBMX 182102
SVRBMX
ALC009-055-115-182145-
/O.NEW.KBMX.SV.W.0302.110618T2102Z-110618T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
402 PM CDT SAT JUN 18 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL BLOUNT COUNTY IN ALABAMA...
  SOUTHWESTERN ETOWAH COUNTY IN NORTHEAST ALABAMA...
  NORTHEASTERN ST. CLAIR COUNTY IN ALABAMA...

* UNTIL 445 PM CDT

* AT 357 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 NEAR ROSA...OR
  NEAR ONEONTA...AND MOVING EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RAINBOW CITY...SUSAN MOORE...ALTOONA...WALNUT GROVE...STEELE...
  ATTALLA...NOCCALULA FALLS AND REECE CITY.

THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 174 THROUGH 188...

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 3409 8601 3384 8605 3393 8658 3411 8655
TIME...MOT...LOC 2102Z 277DEG 19KT 3401 8646

$$

17/KLAWS
2 follow-up statements
508 
WWUS54 KBMX 182119
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
419 PM CDT SAT JUN 18 2011

ALC009-055-115-182145-
/O.CON.KBMX.SV.W.0302.000000T0000Z-110618T2145Z/
BLOUNT AL-ETOWAH AL-ST. CLAIR AL-
419 PM CDT SAT JUN 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
ST. CLAIR...SOUTHWESTERN ETOWAH AND EAST CENTRAL BLOUNT COUNTIES
UNTIL 445 PM CDT...

AT 416 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 ALTOONA...OR 7 MILES NORTHEAST
OF ONEONTA...MOVING EAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  RAINBOW CITY...ALTOONA...WALNUT GROVE...STEELE...ATTALLA...
  NOCCALULA FALLS...REECE CITY...HORSE PENS FORTY...GALLANT AND
  HOWELTON.

THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 174 THROUGH 188...

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

LAT...LON 3409 8601 3384 8605 3391 8645 3410 8642
TIME...MOT...LOC 2119Z 277DEG 19KT 3400 8635

$$

27
786 
WWUS54 KBMX 182129
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
429 PM CDT SAT JUN 18 2011

ALC009-055-115-182139-
/O.CAN.KBMX.SV.W.0302.000000T0000Z-110618T2145Z/
BLOUNT AL-ETOWAH AL-ST. CLAIR AL-
429 PM CDT SAT JUN 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. CLAIR...
SOUTHWESTERN ETOWAH AND EAST CENTRAL BLOUNT COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

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

LAT...LON 3409 8601 3384 8605 3391 8645 3410 8642
TIME...MOT...LOC 2129Z 277DEG 19KT 3399 8629

$$

27

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 3:24 PM CDTSpecial Weather StatementBMXWinston51 min
Jun 18, 3:32 PM CDTSevere Thunderstorm WarningBMXCherokee43 min
Jun 18, 4:00 PM CDTSpecial Weather StatementBMXTalladega30 min
Jun 18, 4:26 PM CDTSpecial Weather StatementBMXCherokee49 min
Jun 18, 4:34 PM CDTSpecial Weather StatementBMXCalhoun41 min
Jun 18, 5:01 PM CDTSpecial Weather StatementBMXCleburne44 min
Jun 18, 5:40 PM CDTSpecial Weather StatementBMXRandolph35 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.