Alert archive / Alabama / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 21, NWS Huntsville, AL

April 4, 2014DeKalb County, Jackson County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 4, 2014, 6:43 AM CDT for DeKalb County, Jackson County, Alabama. It was in force for 17 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
Apr 4, 2014, 6:43 AM CDT (11:43 UTC)
Expired
Apr 4, 2014, 7:00 AM CDT
In force
17 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon

Counties DeKalb County, AL, Jackson County, AL

The radar

The Northeast Alabama radar (KHTX), 67 km from the middle of the area, began a volume at 11:47 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
Apr 4, 2:52 AM CDTTornado WatchSPC5 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 11.7 hours before the alert went out and 161 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, Peachtre/Fal Fld, GA at 00:00Z on 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Peachtre/Fal Fld, GA at 00:00Z on 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2198 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
199 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.

962 
WUUS54 KHUN 041143
SVRHUN
ALC049-071-041200-
/O.NEW.KHUN.SV.W.0021.140404T1143Z-140404T1200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HUNTSVILLE AL
643 AM CDT FRI APR 4 2014

THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DEKALB COUNTY IN NORTHEAST ALABAMA...
  EAST CENTRAL JACKSON COUNTY IN NORTHEAST ALABAMA...

* UNTIL 700 AM CDT

* AT 642 AM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
  PISGAH TO NEAR COLLINSVILLE...AND MOVING NORTHEAST AT 70 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FORT PAYNE...RAINSVILLE...HENAGAR...COLLINSVILLE...SYLVANIA...
  IDER...PISGAH...VALLEY HEAD...HAMMONDVILLE AND MENTONE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CDT FRIDAY MORNING
FOR NORTHERN ALABAMA AND CENTRAL TENNESSEE.

LAT...LON 3448 8558 3444 8558 3437 8563 3436 8566
      3426 8577 3426 8581 3424 8581 3424 8584
      3420 8584 3420 8587 3479 8584 3495 8560
      3453 8551
TIME...MOT...LOC 1142Z 238DEG 62KT 3473 8586 3425 8589 

$$

RSB
1 follow-up statement
247 
WWUS54 KHUN 041159
SVSHUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
659 AM CDT FRI APR 4 2014

ALC049-071-041209-
/O.EXP.KHUN.SV.W.0021.000000T0000Z-140404T1200Z/
DEKALB AL-JACKSON AL-
659 AM CDT FRI APR 4 2014

...THE SEVERE THUNDERSTORM WARNING FOR DEKALB AND EAST CENTRAL
JACKSON COUNTIES WILL EXPIRE AT 700 AM CDT...
            
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3448 8558 3444 8558 3437 8563 3436 8566
      3426 8577 3426 8581 3424 8581 3424 8584
      3420 8584 3420 8587 3479 8584 3495 8560
      3453 8551
TIME...MOT...LOC 1156Z 238DEG 62KT 3473 8586 3425 8589 

$$

RSB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 4, 4:13 AM CDTSevere Thunderstorm WarningHUNColbert, Franklin, Lauderdale47 min
Apr 4, 4:34 AM CDTSevere Thunderstorm WarningHUNFranklin, Lawrence41 min
Apr 4, 4:39 AM CDTSpecial Weather StatementHUNLauderdale, Limestone36 min
Apr 4, 5:00 AM CDTSpecial Weather StatementHUNLawrence45 min
Apr 4, 5:16 AM CDTSpecial Weather StatementHUNLawrence, Limestone, Morgan29 min
Apr 4, 5:26 AM CDTSpecial Weather StatementHUNCullman49 min
Apr 4, 5:47 AM CDTSpecial Weather StatementHUNJackson, Madison, Marshall43 min
Apr 4, 6:05 AM CDTSevere Thunderstorm WarningHUNCullman, Marshall25 min
Apr 4, 6:21 AM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson, Marshall24 min
Apr 4, 7:02 AM CDTSpecial Weather StatementHUNDeKalb13 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2014Every severe thunderstorm warning in 2014

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.