Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 10, NWS Huntsville, AL

February 28, 2011Colbert County, Lauderdale County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Feb 28, 2011, 8:23 AM CST for Colbert County, Lauderdale County, Alabama. It was in force for 23 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
Feb 28, 2011, 8:23 AM CST (14:23 UTC)
Expired
Feb 28, 2011, 8:46 AM CST
In force
23 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon

Counties Colbert County, AL, Lauderdale County, AL

The radar

The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 14:27 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Feb 28, 5:59 AM CSTTornado WatchSPC7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 2.4 hours before the alert went out and 180 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, Nashville Metro, TN at 12:00Z on 2011-02-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 948 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2011-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 369 square meters per square second.1939587897117136Sfc1 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
948 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
795 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
369 m²/s²
0-3 km storm-relative helicity
404 m²/s²
Significant tornado parameter
2.6
Supercell composite
9.4

Open this sounding in Storm Lab

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 Huntsville, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 28, 5:30 AM CST, 2 hours 53 minutes earlier.

Area forecast discussion, Feb 28, 5:30 AM CST, 2 hours 53 minutes before
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Hazardous weather outlook, Feb 28, 4:15 AM CST, 4 hours 8 minutes before
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In the hours before

Special weather statement, Feb 28, 7:21 AM CST, 1 hour 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
721 AM CST MON FEB 28 2011

ALZ001-281400-
LAUDERDALE-
721 AM CST MON FEB 28 2011

...SIGNIFICANT WEATHER ADVISORY FOR LAUDERDALE COUNTY UNTIL 800 AM
CST...

AT 721 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR PICKWICK DAM...OR 13 MILES SOUTH OF
SAVANNAH...MOVING EAST AT 35 MPH.

WINDS OF 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
 WATERLOO.
 RIVERTON.
 WRIGHT.
 THREET.
 ZIP CITY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM CST MONDAY AFTERNOON
FOR NORTHERN ALABAMA AND CENTRAL TENNESSEE.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 3502 8763 3501 8761 3499 8760 3491 8813
      3501 8820 3502 8819
TIME...MOT...LOC 1320Z 255DEG 31KT 3504 8820

70/DD
Special weather statement, Feb 28, 8:18 AM CST, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
818 AM CST MON FEB 28 2011

ALZ001-002-281500-
COLBERT-LAUDERDALE-
818 AM CST MON FEB 28 2011

...SIGNIFICANT WEATHER ADVISORY FOR COLBERT AND LAUDERDALE COUNTIES
UNTIL 900 AM CST...

AT 818 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR IUKA...MOVING NORTHEAST AT 60 MPH.

WINDS FROM 50 TO 55 MPH AND OCCASIONAL CLOUD TO GROUND LIGHTNING
STRIKES ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  WRIGHT.
  THREET...OAKLAND.
  CLOVERDALE...UNDERWOOD-PETERSVILLE.
  ZIP CITY...SAINT FLORIAN.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM CST MONDAY AFTERNOON
FOR NORTHERN ALABAMA AND CENTRAL TENNESSEE.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 3501 8759 3485 8759 3467 8813 3489 8810
      3492 8814 3496 8816 3502 8797
TIME...MOT...LOC 1417Z 243DEG 57KT 3483 8808

70/DD

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 28, 7:21 AM CSTSpecial Weather StatementHUNLauderdale39 min
Feb 28, 8:18 AM CSTSpecial Weather StatementHUNLauderdale42 min
Feb 28, 10:30 AM CSTSpecial Weather StatementHUNLauderdale45 min
Feb 28, 10:41 AM CSTSpecial Weather StatementHUNColbert49 min
Feb 28, 10:47 AM CSTSevere Thunderstorm WarningHUNColbert, Franklin58 min
Feb 28, 10:57 AM CSTSevere Thunderstorm WarningHUNLauderdale46 min
Feb 28, 11:09 AM CSTSevere Thunderstorm WarningHUNColbert35 min
Feb 28, 11:38 AM CSTSpecial Weather StatementHUNLimestone67 min
Feb 28, 12:04 PM CSTSevere Thunderstorm WarningHUNLimestone, Madison56 min
Feb 28, 12:19 PM CSTTornado WarningHUNJackson, Madison28 min
Feb 28, 12:41 PM CSTSevere Thunderstorm WarningHUNJackson, Madison, Morgan49 min
Feb 28, 12:44 PM CSTTornado WarningHUNJackson46 min
Feb 28, 1:04 PM CSTSpecial Weather StatementHUNMarshall26 min
Feb 28, 1:19 PM CSTSevere Thunderstorm WarningHUNDeKalb, Jackson41 min
Feb 28, 1:24 PM CSTSevere Thunderstorm WarningHUNDeKalb, Jackson, Marshall51 min
Feb 28, 1:37 PM CSTSpecial Weather StatementHUNCullman38 min
Feb 28, 1:51 PM CSTTornado WarningHUNDeKalb24 min
Feb 28, 2:14 PM CSTSevere Thunderstorm WarningHUNDeKalb, Marshall46 min
Feb 28, 2:21 PM CSTSevere Thunderstorm WarningHUNCullman39 min
Feb 28, 11:48 AM CSTSpecial Weather StatementHUNLincoln, Moore42 min
Feb 28, 11:56 AM CSTTornado WarningHUNLincoln25 min
Feb 28, 12:07 PM CSTSevere Thunderstorm WarningHUNFranklin, Lincoln, Moore23 min
Feb 28, 12:12 PM CSTTornado Warning EmergencyHUNFranklin, Moore18 min
Feb 28, 12:27 PM CSTTornado Warning EmergencyHUNFranklin, Moore18 min
Feb 28, 12:36 PM CSTSevere Thunderstorm WarningHUNFranklin24 min
Feb 28, 12:45 PM CSTTornado WarningHUNFranklin15 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.