Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 45, NWS Huntsville, AL

May 4, 2021Cullman County, Morgan County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at May 4, 2021, 9:31 AM CDT for Cullman County, Morgan County, Alabama. It was in force for 39 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: May 4, 2021, 9:31 AM CDT (14:31 UTC)
Expired: May 4, 2021, 10:10 AM CDT
In force: 39 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cullman County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 90 km from the middle of the area, began a volume at 14:34 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
May 4, 9:18 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 2.5 hours before the alert went out and 123 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: 2158 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.3

Open this sounding in Storm Lab

The text

As transmitted.

227 
WUUS54 KHUN 041431
SVRHUN
ALC043-103-041530-
/O.NEW.KHUN.SV.W.0045.210504T1431Z-210504T1530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
931 AM CDT Tue May 4 2021

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  Northern Cullman County in north central Alabama...
  Southern Morgan County in north central Alabama...

* Until 1030 AM CDT.

* At 930 AM CDT, a severe thunderstorm was located over Addison, or 9
  miles north of Arley, moving east at 45 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Cullman, Hartselle, Good Hope, Falkville, Holly Pond, Morgan City,
  Baldwin, Vinemont, Baileyton and West Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 PM CDT for north central
and northeastern Alabama.

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

&&

LAT...LON 3438 8711 3449 8656 3439 8658 3431 8658
      3430 8650 3426 8649 3425 8652 3423 8652
      3422 8654 3419 8655 3413 8660 3409 8711
TIME...MOT...LOC 1430Z 255DEG 37KT 3422 8718 

HAIL...0.75IN
WIND...60MPH
 
$$

05/MA

3 follow-up statements

978 
WWUS54 KHUN 041447
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
947 AM CDT Tue May 4 2021

ALC043-103-041530-
/O.CON.KHUN.SV.W.0045.000000T0000Z-210504T1530Z/
Cullman AL-Morgan AL-
947 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 AM CDT
FOR NORTHERN CULLMAN AND SOUTHEASTERN MORGAN COUNTIES...

At 947 AM CDT, a severe thunderstorm was located 7 miles northwest of
Cullman, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Cullman, Good Hope, Falkville, Holly Pond, Morgan City, Baldwin,
Vinemont, Baileyton, West Point and Eva.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 PM CDT for north central
and northeastern Alabama.

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

&&

LAT...LON 3433 8702 3449 8656 3439 8658 3431 8658
      3430 8650 3426 8649 3425 8652 3423 8652
      3422 8654 3419 8655 3413 8660 3410 8704
TIME...MOT...LOC 1447Z 262DEG 37KT 3422 8696 

HAIL...<.75IN
WIND...60MPH
 
$$

05/MA

662 
WWUS54 KHUN 041459
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
959 AM CDT Tue May 4 2021

ALC043-103-041530-
/O.CON.KHUN.SV.W.0045.000000T0000Z-210504T1530Z/
Cullman AL-Morgan AL-
959 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 AM CDT
FOR NORTHEASTERN CULLMAN AND SOUTHEASTERN MORGAN COUNTIES...

At 958 AM CDT, a severe thunderstorm was located near Cullman, moving
east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Cullman, Good Hope, Holly Pond, Baldwin, Vinemont, Baileyton, Eva,
Phelan, Ryan Crossroads and Joppa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 PM CDT for north central
and northeastern Alabama.

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

&&

LAT...LON 3432 8688 3439 8658 3431 8658 3430 8650
      3426 8649 3425 8652 3423 8652 3422 8654
      3419 8655 3413 8660 3411 8694
TIME...MOT...LOC 1458Z 264DEG 46KT 3422 8685 

HAIL...<.75IN
WIND...60MPH
 
$$

05/MA

934 
WWUS54 KHUN 041510
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
1010 AM CDT Tue May 4 2021

ALC043-103-041519-
/O.CAN.KHUN.SV.W.0045.000000T0000Z-210504T1530Z/
Cullman AL-Morgan AL-
1010 AM CDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CULLMAN AND
SOUTHEASTERN MORGAN COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 400 PM CDT for north central
and northeastern Alabama.

A Severe Thunderstorm Watch remains in effect until 1100 AM CDT for
northeastern Alabama.

LAT...LON 3432 8688 3439 8658 3431 8658 3430 8650
      3426 8649 3425 8652 3423 8652 3422 8654
      3419 8655 3413 8660 3411 8694
TIME...MOT...LOC 1508Z 255DEG 37KT 3425 8671 

$$

MA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 7:18 AM CDT	Special Weather Statement	HUN	Colbert	42 min
May 4, 7:45 AM CDT	Special Weather Statement	HUN	Cullman	60 min
May 4, 8:31 AM CDT	Special Weather Statement	HUN	Limestone, Madison, Morgan	44 min
May 4, 9:01 AM CDT	Special Weather Statement	HUN	Jackson	44 min
May 4, 9:04 AM CDT	Severe Thunderstorm Warning	HUN	Jackson	26 min
May 4, 9:23 AM CDT	Special Weather Statement	HUN	DeKalb	52 min
May 4, 9:25 AM CDT	Special Weather Statement	HUN	Cullman, Morgan	50 min
May 4, 9:39 AM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	36 min
May 4, 9:51 AM CDT	Severe Thunderstorm Warning	HUN	DeKalb	24 min
May 4, 10:17 AM CDT	Special Weather Statement	HUN	DeKalb	58 min
May 4, 10:47 AM CDT	Flash Flood Warning	HUN	DeKalb, Marshall	3 hr
May 4, 10:51 AM CDT	Special Weather Statement	HUN	Marshall	39 min
May 4, 11:15 AM CDT	Special Weather Statement	HUN	Cullman	45 min
May 4, 11:18 AM CDT	Severe Thunderstorm Warning	HUN	Cullman	42 min
May 4, 3:37 PM CDT	Special Weather Statement	HUN	Franklin	23 min
May 4, 4:18 PM CDT	Special Weather Statement	HUN	Lauderdale	27 min
May 4, 5:10 PM CDT	Special Weather Statement	HUN	Cullman	35 min
May 4, 5:56 PM CDT	Special Weather Statement	HUN	Madison	49 min
May 4, 6:01 PM CDT	Special Weather Statement	HUN	Marshall	44 min
May 4, 6:16 PM CDT	Special Weather Statement	HUN	Madison	44 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.