Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Huntsville, AL

February 28, 2011Cullman County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Feb 28, 2011, 2:21 PM CST for Cullman County, Alabama. It was in force for 39 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: Feb 28, 2011, 2:21 PM CST (20:21 UTC)
Expired: Feb 28, 2011, 3:00 PM CST
In force: 39 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

County Cullman County, AL

The radar

The Northeast Alabama radar (KHTX), 102 km from the middle of the area, began a volume at 20:23 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
Feb 28, 2:39 PM CST	HAIL 1.75	1 S Fairview, AL	GOLF BALL SIZE HAIL REPORTED NEAR ANTIOCH.

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
Feb 28, 12:29 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 8.4 hours before the alert went out and 109 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: 652 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 498 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 425 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

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

498 
WUUS54 KHUN 282021
SVRHUN
ALC043-282100-
/O.NEW.KHUN.SV.W.0021.110228T2021Z-110228T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HUNTSVILLE AL
221 PM CST MON FEB 28 2011

THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CULLMAN COUNTY IN NORTH CENTRAL ALABAMA...

* UNTIL 300 PM CST

* AT 221 PM CST...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
  LOGAN...OR ABOUT 10 MILES SOUTHWEST OF CULLMAN...AND MOVING EAST AT
  60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PHELAN...HANCEVILLE...
  WALTER...FAIRVIEW...
  HOLLY POND...BAILEYTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CST MONDAY EVENING FOR
NORTHEASTERN ALABAMA AND CENTRAL TENNESSEE.

&&

LAT...LON 3416 8709 3431 8648 3429 8648 3429 8646
      3426 8645 3425 8652 3413 8659 3412 8662
      3410 8665 3409 8669 3406 8668 3405 8669
      3398 8703
TIME...MOT...LOC 2021Z 255DEG 54KT 3410 8694

$$

70/DD

2 follow-up statements

297 
WWUS54 KHUN 282044
SVSHUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
244 PM CST MON FEB 28 2011

ALC043-282100-
/O.CON.KHUN.SV.W.0021.000000T0000Z-110228T2100Z/
CULLMAN AL-
244 PM CST MON FEB 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CST
FOR NORTHEASTERN CULLMAN COUNTY...

AT 244 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR WALTER...OR ABOUT 11 MILES EAST OF CULLMAN...MOVING EAST
AT 60 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY..

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

GOLF BALL SIZE HAIL HAS BEEN REPORTED IN NORTHEAST CULLMAN COUNTY 
WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE 
IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CST MONDAY EVENING FOR
NORTHEASTERN ALABAMA AND CENTRAL TENNESSEE.

&&

LAT...LON 3405 8669 3424 8676 3431 8648 3429 8648
      3429 8646 3426 8645 3425 8652 3413 8659
      3412 8662 3410 8665 3409 8669 3406 8668
TIME...MOT...LOC 2042Z 255DEG 54KT 3417 8657

$$

70/DD

402 
WWUS54 KHUN 282058
SVSHUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
258 PM CST MON FEB 28 2011

ALC043-282106-
/O.EXP.KHUN.SV.W.0021.000000T0000Z-110228T2100Z/
CULLMAN AL-
258 PM CST MON FEB 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CULLMAN COUNTY
EXPIRES AT 300 PM CST...

WEATHER SERVICE DOPPLER RADAR INDICATED THE SEVERE THUNDERSTORM THAT
PROMPTED THE WARNING HAD MOVED OUT OF THE COUNTY. THEREFORE THE
SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE.

HEAVY RAIN...SMALL HAIL...GUSTY WINDS...AND OCCASIONAL LIGHTNING ARE 
STILL POSSIBLE FROM ADDITIONAL THUNDERSTORMS BETWEEN GARDEN CITY AND 
HANCEVILLE. STAY INDOORS UNTIL THE STORM HAS PASSED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CST MONDAY EVENING FOR
NORTHEASTERN ALABAMA AND CENTRAL TENNESSEE.

LAT...LON 3405 8669 3424 8676 3431 8648 3429 8648
      3429 8646 3426 8645 3425 8652 3413 8659
      3412 8662 3410 8665 3409 8669 3406 8668
TIME...MOT...LOC 2056Z 255DEG 54KT 3421 8632

$$

70/DD

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 7:21 AM CST	Special Weather Statement	HUN	Lauderdale	39 min
Feb 28, 8:18 AM CST	Special Weather Statement	HUN	Lauderdale	42 min
Feb 28, 8:23 AM CST	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	23 min
Feb 28, 10:30 AM CST	Special Weather Statement	HUN	Lauderdale	45 min
Feb 28, 10:41 AM CST	Special Weather Statement	HUN	Colbert	49 min
Feb 28, 10:47 AM CST	Severe Thunderstorm Warning	HUN	Colbert, Franklin	58 min
Feb 28, 10:57 AM CST	Severe Thunderstorm Warning	HUN	Lauderdale	46 min
Feb 28, 11:09 AM CST	Severe Thunderstorm Warning	HUN	Colbert	35 min
Feb 28, 11:38 AM CST	Special Weather Statement	HUN	Limestone	67 min
Feb 28, 12:04 PM CST	Severe Thunderstorm Warning	HUN	Limestone, Madison	56 min
Feb 28, 12:19 PM CST	Tornado Warning	HUN	Jackson, Madison	28 min
Feb 28, 12:41 PM CST	Severe Thunderstorm Warning	HUN	Jackson, Madison, Morgan	49 min
Feb 28, 12:44 PM CST	Tornado Warning	HUN	Jackson	46 min
Feb 28, 1:04 PM CST	Special Weather Statement	HUN	Marshall	26 min
Feb 28, 1:19 PM CST	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	41 min
Feb 28, 1:24 PM CST	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Marshall	51 min
Feb 28, 1:37 PM CST	Special Weather Statement	HUN	Cullman	38 min
Feb 28, 1:51 PM CST	Tornado Warning	HUN	DeKalb	24 min
Feb 28, 2:14 PM CST	Severe Thunderstorm Warning	HUN	DeKalb, Marshall	46 min

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.