Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Huntsville, AL

March 28, 2021DeKalb County, Marshall County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Mar 28, 2021, 5:57 AM CDT for DeKalb County, Marshall County, Alabama. It was in force for 33 min. 3 reports 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: Mar 28, 2021, 5:57 AM CDT (10:57 UTC)
Expired: Mar 28, 2021, 6:30 AM CDT
In force: 33 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties DeKalb County, AL, Marshall County, AL

The radar

The Northeast Alabama radar (KHTX), 78 km from the middle of the area, began a volume at 10:58 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
Mar 28, 6:10 AM CDT	TSTM WND DMG	1 W Guntersville, AL	NUMEROUS TREES DOWN NEAR THE COURTHOUSE IN GUNTERSVILLE.
Mar 28, 6:15 AM CDT	TSTM WND DMG	7 W Geraldine, AL	ROOF DAMAGE NEAR THE ASBURY COMMUNITY.
Mar 28, 6:26 AM CDT	TSTM WND GST 50	3 Nne Crossville, AL	WIND GUST MEASURED AT 50MPH.

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
Mar 27, 11:27 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 11.0 hours before the alert went out and 127 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: 643 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1359 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

868 
WUUS54 KHUN 281057
SVRHUN
ALC049-095-281145-
/O.NEW.KHUN.SV.W.0029.210328T1057Z-210328T1145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
557 AM CDT Sun Mar 28 2021

The National Weather Service in Huntsville Alabama has issued a

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

* Until 645 AM CDT.

* At 557 AM CDT, a severe thunderstorm was located over Strawberry,
  or near Arab, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Albertville, Boaz, Guntersville, Arab, Crossville, Geraldine,
  Douglas, Lakeview, Union Grove and High Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 AM CDT for northeastern
Alabama.

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

&&

LAT...LON 3426 8644 3426 8646 3427 8645 3429 8646
      3429 8648 3430 8648 3431 8658 3439 8657
      3446 8599 3420 8593 3420 8611 3419 8611
      3418 8619 3414 8625 3414 8634
TIME...MOT...LOC 1057Z 256DEG 39KT 3423 8651 

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

Barron

2 follow-up statements

173 
WWUS54 KHUN 281115
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
615 AM CDT Sun Mar 28 2021

ALC049-095-281145-
/O.CON.KHUN.SV.W.0029.000000T0000Z-210328T1145Z/
Marshall AL-DeKalb AL-
615 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 AM CDT
FOR SOUTHEASTERN MARSHALL AND SOUTHWESTERN DEKALB COUNTIES...

At 614 AM CDT, a severe thunderstorm was located near Albertville,
moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Albertville, Boaz, Guntersville, Crossville, Geraldine, Douglas,
Lakeview, McVille, High Point and Horton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 AM CDT for northeastern
Alabama.

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

&&

LAT...LON 3435 8628 3443 8626 3446 8599 3420 8593
      3420 8611 3419 8611 3418 8619 3418 8631
TIME...MOT...LOC 1114Z 256DEG 39KT 3428 8628 

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

Barron

427 
WWUS54 KHUN 281130
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
630 AM CDT Sun Mar 28 2021

ALC049-095-281140-
/O.CAN.KHUN.SV.W.0029.000000T0000Z-210328T1145Z/
Marshall AL-DeKalb AL-
630 AM CDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARSHALL AND
SOUTHWESTERN DEKALB COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

A Tornado Watch remains in effect until 700 AM CDT for northeastern
Alabama.

LAT...LON 3435 8628 3443 8626 3446 8599 3420 8593
      3420 8611 3419 8611 3418 8619 3418 8631
TIME...MOT...LOC 1129Z 256DEG 39KT 3432 8607 

$$

Barron

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 12:31 AM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	44 min
Mar 28, 1:13 AM CDT	Special Weather Statement	HUN	Lauderdale	47 min
Mar 28, 1:52 AM CDT	Flash Flood Warning	HUN	Lauderdale	3 hr
Mar 28, 2:39 AM CDT	Special Weather Statement	HUN	Colbert	51 min
Mar 28, 2:45 AM CDT	Special Weather Statement	HUN	Franklin	45 min
Mar 28, 3:09 AM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lawrence	36 min
Mar 28, 3:34 AM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Morgan	26 min
Mar 28, 3:58 AM CDT	Severe Thunderstorm Warning	HUN	Jackson, Limestone, Madison, Morgan	47 min
Mar 28, 4:26 AM CDT	Severe Thunderstorm Warning	HUN	Jackson	34 min
Mar 28, 4:46 AM CDT	Severe Thunderstorm Warning	HUN	Jackson, Limestone, Madison, Morgan	44 min
Mar 28, 5:02 AM CDT	Severe Thunderstorm Warning	HUN	Cullman	28 min
Mar 28, 5:21 AM CDT	Severe Thunderstorm Warning	HUN	Jackson	24 min
Mar 28, 5:30 AM CDT	Severe Thunderstorm Warning	HUN	Cullman	30 min
Mar 28, 5:41 AM CDT	Areal Flood Warning	HUN	Madison	3 hr
Mar 28, 6:26 AM CDT	Special Weather Statement	HUN	DeKalb	34 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.