Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 32, NWS Huntsville, AL

April 9, 2021Cullman County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 9, 2021, 2:40 PM CDT for Cullman County, Alabama. It was in force for 25 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 9, 2021, 2:40 PM CDT (19:40 UTC)
Expired: Apr 9, 2021, 3:05 PM CDT
In force: 25 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 86 km from the middle of the area, began a volume at 19:41 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, 7.7 hours before the alert went out and 85 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: 89 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 1321 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

478 
WUUS54 KHUN 091940
SVRHUN
ALC043-092030-
/O.NEW.KHUN.SV.W.0032.210409T1940Z-210409T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
240 PM CDT Fri Apr 9 2021

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  Southwestern Cullman County in north central Alabama...

* Until 330 PM CDT.

* At 239 PM CDT, a severe thunderstorm was located over Smith Dam, or
  12 miles north of Sumiton, moving east at 25 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...
  Hanceville, Dodge City, Garden City, Colony, Wilburn, Bremen,
  Arkadelphia, Black Bottom and Smith Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3389 8701 3390 8710 3392 8708 3397 8713
      3399 8713 3400 8711 3406 8668 3395 8679
      3396 8682 3394 8682 3395 8685 3393 8686
      3394 8688 3392 8689 3391 8692 3387 8692
      3386 8696 3386 8699
TIME...MOT...LOC 1939Z 260DEG 22KT 3393 8706 

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

30

2 follow-up statements

722 
WWUS54 KHUN 091952
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
252 PM CDT Fri Apr 9 2021

ALC043-092030-
/O.CON.KHUN.SV.W.0032.000000T0000Z-210409T2030Z/
Cullman AL-
252 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR SOUTHWESTERN CULLMAN COUNTY...

At 252 PM CDT, a severe thunderstorm was located near Arkadelphia, or
8 miles north of Sumiton, moving east at 25 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...
Colony, Wilburn, Arkadelphia and Black Bottom. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3390 8709 3392 8708 3393 8708 3396 8707
      3397 8677 3395 8679 3396 8682 3394 8682
      3395 8685 3393 8686 3394 8688 3392 8689
      3391 8692 3387 8692 3386 8696 3386 8699
      3389 8701
TIME...MOT...LOC 1952Z 278DEG 20KT 3387 8699 

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

30

199 
WWUS54 KHUN 092005
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
305 PM CDT Fri Apr 9 2021

ALC043-092015-
/O.CAN.KHUN.SV.W.0032.000000T0000Z-210409T2030Z/
Cullman AL-
305 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CULLMAN COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 3390 8709 3392 8708 3393 8708 3396 8707
      3397 8677 3395 8679 3396 8682 3394 8682
      3395 8685 3393 8686 3394 8688 3392 8689
      3391 8692 3387 8692 3386 8696 3386 8699
      3389 8701
TIME...MOT...LOC 2003Z 260DEG 22KT 3388 8689 

$$

30

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 7:27 PM CDT	River Flood Warning	HUN	Madison	18 hr
Apr 9, 1:04 PM CDT	Special Weather Statement	HUN	Cullman	56 min
Apr 9, 1:41 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone	34 min
Apr 9, 2:12 PM CDT	Special Weather Statement	HUN	Limestone	48 min
Apr 9, 2:23 PM CDT	Special Weather Statement	HUN	DeKalb	52 min
Apr 9, 2:33 PM CDT	Special Weather Statement	HUN	Cullman	42 min
Apr 9, 2:46 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	29 min
Apr 9, 3:09 PM CDT	Special Weather Statement	HUN	Madison	51 min
Apr 9, 3:45 PM CDT	Special Weather Statement	HUN	Cullman	45 min
Apr 9, 3:47 PM CDT	Special Weather Statement	HUN	Morgan	43 min
Apr 9, 3:52 PM CDT	Severe Thunderstorm Warning	HUN	Limestone	38 min
Apr 9, 4:10 PM CDT	Special Weather Statement	HUN	Limestone	35 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.