Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS Huntsville, AL

April 24, 2021Jackson County, Madison County, Marshall County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 24, 2021, 4:48 PM CDT for Jackson County, Madison County, Marshall County, Alabama. It was in force for 27 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, 4:48 PM CDT (21:48 UTC)
Expired: Apr 24, 2021, 5:15 PM CDT
In force: 27 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Jackson County, AL, Madison County, AL, Marshall County, AL

The radar

The Northeast Alabama radar (KHTX), 50 km from the middle of the area, began a volume at 21:49 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 nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.8 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.

318 
WUUS54 KHUN 242148
SVRHUN
ALC071-089-095-242215-
/O.NEW.KHUN.SV.W.0039.210424T2148Z-210424T2215Z/

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

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  Southwestern Jackson County in northeastern Alabama...
  Northern Marshall County in northeastern Alabama...
  Southeastern Madison County in north central Alabama...

* Until 515 PM CDT.

* At 448 PM CDT, a severe thunderstorm was located over southeastern
  Huntsville, moving east at 45 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...
  Southern Huntsville, Scottsboro, Redstone Arsenal, Owens Cross
  Roads, Grant, Gurley, Section, Woodville, Morgan City and Pleasant
  Groves.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3447 8657 3456 8655 3459 8659 3466 8660
      3476 8602 3449 8598
TIME...MOT...LOC 2148Z 262DEG 38KT 3458 8650 

HAIL...1.00IN
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, 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, 5:27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.