Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Huntsville, AL

March 28, 2021Lawrence County, Limestone County, Morgan County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Mar 28, 2021, 3:34 AM CDT for Lawrence County, Limestone County, Morgan County, Alabama. It was in force for 26 min. 2 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, 3:34 AM CDT (08:34 UTC)
Expired: Mar 28, 2021, 4:00 AM CDT
In force: 26 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Lawrence County, AL, Limestone County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 114 km from the middle of the area, began a volume at 08:38 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, 3:56 AM CDT	TSTM WND GST 60	1 N Trinity, AL	ESTIMATED WINDS OF 60 MPH OR HIGHER IN TRINITY.
Mar 28, 4:02 AM CDT	TSTM WND GST 51	4 Wnw Mooresville, AL	AT PRYOR FIELD IN DECATUR.

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, 8.6 hours before the alert went out and 149 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.

525 
WUUS54 KHUN 280834
SVRHUN
ALC079-083-103-280900-
/O.NEW.KHUN.SV.W.0022.210328T0834Z-210328T0900Z/

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

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  Southern Limestone County in north central Alabama...
  Northwestern Morgan County in north central Alabama...
  Eastern Lawrence County in northwestern Alabama...

* Until 400 AM CDT.

* At 333 AM CDT, severe thunderstorms were located along a line
  extending from 6 miles east of Courtland to near Moulton to near
  Needmore, moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Decatur, Athens, Hartselle, Moulton, Priceville, Trinity, Tanner,
  Hillsboro, Mooresville and Belle Mina.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 AM CDT for north central,
northeastern and northwestern Alabama...and Middle Tennessee.

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

Damaging winds and continuous cloud to ground lightning is occurring 
with these storms. 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 3430 8744 3431 8745 3453 8725 3473 8725
      3482 8680 3453 8688 3430 8712
TIME...MOT...LOC 0833Z 255DEG 42KT 3469 8720 3452 8731 3432 8759 

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

25

1 follow-up statement

182 
WWUS54 KHUN 280859
SVSHUN

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

ALC079-083-103-280909-
/O.EXP.KHUN.SV.W.0022.000000T0000Z-210328T0900Z/
Limestone AL-Morgan AL-Lawrence AL-
359 AM CDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN LIMESTONE...
NORTHWESTERN MORGAN AND EASTERN LAWRENCE COUNTIES WILL EXPIRE AT 400
AM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 600 AM CDT for north central,
northeastern and northwestern Alabama...and Middle Tennessee.


LAT...LON 3430 8744 3431 8745 3453 8725 3473 8725
      3482 8680 3453 8688 3430 8712
TIME...MOT...LOC 0859Z 255DEG 42KT 3476 8687 3459 8698 3439 8727 

$$

GH

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, 3:58 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, 5:57 AM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Marshall	33 min
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.