Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 42, NWS Huntsville, AL

April 24, 2021DeKalb County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 24, 2021, 5:27 PM CDT for DeKalb County, Alabama. It was in force for 18 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 24, 2021, 5:27 PM CDT (22:27 UTC)
Expired: Apr 24, 2021, 5:45 PM CDT
In force: 18 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 68 km from the middle of the area, began a volume at 22:28 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.

Issued	Product	Office	Lasted
Apr 24, 4:52 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.5 hours before the alert went out and 159 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: 449 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: 309 m²/s²
0-3 km storm-relative helicity: 449 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

761 
WUUS54 KHUN 242227
SVRHUN
ALC049-242245-
/O.NEW.KHUN.SV.W.0042.210424T2227Z-210424T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
527 PM CDT Sat Apr 24 2021

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  Southeastern DeKalb County in northeastern Alabama...

* Until 545 PM CDT.

* At 526 PM CDT, a severe thunderstorm was located near Fyffe, or 7
  miles south of Rainsville, moving east at 50 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Fort Payne, Rainsville, Fyffe, Valley Head, Hammondville, Mentone,
  Pine Ridge, Dog Town, Collbran and Guest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 3448 8558 3444 8558 3441 8561 3437 8563
      3436 8566 3434 8568 3430 8573 3428 8592
      3446 8597 3459 8554 3453 8551
TIME...MOT...LOC 2226Z 259DEG 42KT 3439 8586 

HAIL...1.25IN
WIND...60MPH
 
$$

RSB

2 follow-up statements

108 
WWUS54 KHUN 242237
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
537 PM CDT Sat Apr 24 2021

ALC049-242245-
/O.CON.KHUN.SV.W.0042.000000T0000Z-210424T2245Z/
DeKalb AL-
537 PM CDT Sat Apr 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR SOUTHEASTERN DEKALB COUNTY...

At 536 PM CDT, a severe thunderstorm was located over Fort Payne,
moving east at 50 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Fort Payne, Rainsville, Valley Head, Mentone, Pine Ridge, Dog Town,
Collbran, Adamsburg, Desoto State Park and Little River Canyon NP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3431 8577 3448 8582 3457 8553 3453 8551
      3448 8558 3444 8558 3441 8561 3437 8563
      3436 8566 3434 8568 3431 8572
TIME...MOT...LOC 2236Z 259DEG 42KT 3441 8571 

HAIL...1.00IN
WIND...60MPH
 
$$

RSB

646 
WWUS54 KHUN 242245
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
545 PM CDT Sat Apr 24 2021

ALC049-242255-
/O.EXP.KHUN.SV.W.0042.000000T0000Z-210424T2245Z/
DeKalb AL-
545 PM CDT Sat Apr 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DEKALB COUNTY HAS
EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.  However small
hail is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern Alabama.

LAT...LON 3431 8577 3448 8582 3457 8553 3453 8551
      3448 8558 3444 8558 3441 8561 3437 8563
      3436 8566 3434 8568 3431 8572
TIME...MOT...LOC 2245Z 259DEG 42KT 3442 8563 

$$

RSB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 3:31 PM CDT	Special Weather Statement	HUN	Colbert	29 min
Apr 24, 3:52 PM CDT	Special Weather Statement	HUN	Morgan	23 min
Apr 24, 3:58 PM CDT	Special Weather Statement	HUN	Lawrence, Limestone	32 min
Apr 24, 4:01 PM CDT	Special Weather Statement	HUN	Morgan	29 min
Apr 24, 4:06 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Morgan	24 min
Apr 24, 4:10 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Madison, Morgan	35 min
Apr 24, 4:28 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Marshall, Morgan	47 min
Apr 24, 4:33 PM CDT	Special Weather Statement	HUN	Madison	42 min
Apr 24, 4:39 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Limestone, Madison	38 min
Apr 24, 4:41 PM CDT	Special Weather Statement	HUN	Cullman	19 min
Apr 24, 4:48 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison, Marshall	27 min
Apr 24, 5:05 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Marshall	25 min
Apr 24, 5:07 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Marshall	23 min
Apr 24, 5:18 PM CDT	Special Weather Statement	HUN	Jackson	42 min
Apr 24, 5:31 PM CDT	Special Weather Statement	HUN	DeKalb	29 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2021 Every severe thunderstorm warning in 2021

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.