Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Huntsville, AL

April 24, 2021DeKalb County, Marshall County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 24, 2021, 5:05 PM CDT for DeKalb County, Marshall County, Alabama. It was in force for 25 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: Apr 24, 2021, 5:05 PM CDT (22:05 UTC)
Expired: Apr 24, 2021, 5:30 PM CDT
In force: 25 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties DeKalb County, AL, Marshall County, AL

The radar

The Northeast Alabama radar (KHTX), 60 km from the middle of the area, began a volume at 22:07 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
Apr 24, 5:15 PM CDT	HAIL 1	Geraldine, AL	QUARTER-SIZE HAIL REPORTED IN GERALDINE ON TWITTER.

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
Apr 24, 4:52 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.1 hours before the alert went out and 158 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: 580 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 855 m²/s²
0-3 km storm-relative helicity: 1103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

430 
WUUS54 KHUN 242205
SVRHUN
ALC049-095-242230-
/O.NEW.KHUN.SV.W.0040.210424T2205Z-210424T2230Z/

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

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  East central Marshall County in northeastern Alabama...
  Southwestern DeKalb County in northeastern Alabama...

* Until 530 PM CDT.

* At 504 PM CDT, a severe thunderstorm was located near Albertville,
  moving east at 45 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Albertville, Fort Payne, Guntersville, Rainsville, Crossville,
  Fyffe, Geraldine, Pine Ridge, Lakeview and Little River Canyon NP.

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 3436 8567 3434 8568 3427 8576 3425 8623
      3443 8627 3447 8608 3446 8608 3448 8604
      3447 8603 3448 8602 3455 8568 3436 8565
TIME...MOT...LOC 2204Z 260DEG 39KT 3435 8616 

HAIL...1.50IN
WIND...60MPH
 
$$

RSB

1 follow-up statement

308 
WWUS54 KHUN 242221
SVSHUN

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

ALC095-242231-
/O.CAN.KHUN.SV.W.0040.000000T0000Z-210424T2230Z/
Marshall AL-
521 PM CDT Sat Apr 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MARSHALL COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 3428 8600 3445 8604 3454 8575 3455 8570
      3436 8566 3436 8567 3434 8568 3428 8575
TIME...MOT...LOC 2221Z 260DEG 39KT 3438 8594 

$$

ALC049-242230-
/O.CON.KHUN.SV.W.0040.000000T0000Z-210424T2230Z/
DeKalb AL-
521 PM CDT Sat Apr 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR SOUTHWESTERN DEKALB COUNTY...

At 521 PM CDT, a severe thunderstorm was located near Geraldine, or 9
miles southwest of Rainsville, moving east at 45 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Fort Payne, Rainsville, Crossville, Sylvania, Fyffe, Geraldine, Pine
Ridge, Lakeview, Dog Town and Collbran.

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 3428 8600 3445 8604 3454 8575 3455 8570
      3436 8566 3436 8567 3434 8568 3428 8575
TIME...MOT...LOC 2221Z 260DEG 39KT 3438 8594 

HAIL...1.50IN
WIND...60MPH
 
$$

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, 5:07 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, 5:27 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	18 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.