Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Huntsville, AL

July 30, 2021DeKalb County, Jackson County, Marshall County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 30, 2021, 4:08 PM CDT for DeKalb County, Jackson County, Marshall County, Alabama. It was in force for 37 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: Jul 30, 2021, 4:08 PM CDT (21:08 UTC)
Expired: Jul 30, 2021, 4:45 PM CDT
In force: 37 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties DeKalb County, AL, Jackson County, AL, Marshall County, AL

The radar

The Northeast Alabama radar (KHTX), 48 km from the middle of the area, began a volume at 21:11 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, 9.1 hours before the alert went out and 160 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: 1105 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1087 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: -15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

357 
WUUS54 KHUN 302108
SVRHUN
ALC049-071-095-302145-
/O.NEW.KHUN.SV.W.0067.210730T2108Z-210730T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
408 PM CDT Fri Jul 30 2021

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  South central Jackson County in northeastern Alabama...
  Northeastern Marshall County in northeastern Alabama...
  West central DeKalb County in northeastern Alabama...

* Until 445 PM CDT.

* At 408 PM CDT, a severe thunderstorm was located near Section, or 9
  miles south of Scottsboro, moving southeast at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Scottsboro, Rainsville, Fyffe, Powell, Geraldine, Section,
  Langston, Lakeview, Hopewell and Painter.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3452 8622 3465 8607 3450 8579 3430 8609
TIME...MOT...LOC 2108Z 313DEG 12KT 3454 8608 

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

KTW

2 follow-up statements

075 
WWUS54 KHUN 302128
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
428 PM CDT Fri Jul 30 2021

ALC049-071-095-302145-
/O.CON.KHUN.SV.W.0067.000000T0000Z-210730T2145Z/
Jackson AL-Marshall AL-DeKalb AL-
428 PM CDT Fri Jul 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTH CENTRAL JACKSON...NORTHEASTERN MARSHALL AND WEST CENTRAL
DEKALB COUNTIES...

At 427 PM CDT, a severe thunderstorm was located near Section, or 9
miles west of Rainsville, moving southeast at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Scottsboro, Rainsville, Fyffe, Powell, Geraldine, Section, Langston,
Lakeview, Hopewell and Painter.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3449 8620 3462 8603 3450 8579 3430 8609
TIME...MOT...LOC 2127Z 313DEG 12KT 3449 8602 

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

KTW

510 
WWUS54 KHUN 302135
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
435 PM CDT Fri Jul 30 2021

ALC049-071-095-302145-
/O.EXP.KHUN.SV.W.0067.000000T0000Z-210730T2145Z/
Jackson AL-Marshall AL-DeKalb AL-
435 PM CDT Fri Jul 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL JACKSON...
NORTHEASTERN MARSHALL AND WEST CENTRAL DEKALB COUNTIES WILL EXPIRE AT
445 PM CDT...
                
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 will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3449 8620 3462 8603 3450 8579 3430 8609
TIME...MOT...LOC 2135Z 313DEG 12KT 3447 8600 

$$

KTW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 1:42 PM CDT	Excessive Heat Warning	HUN	Colbert, Franklin, Lauderdale, Lawrence	5 hr
Jul 30, 2:24 PM CDT	Heat Advisory	HUN	Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more	29 hr
Jul 30, 3:25 PM CDT	Special Weather Statement	HUN	Lawrence	50 min
Jul 30, 3:59 PM CDT	Special Weather Statement	HUN	Jackson	31 min
Jul 30, 4:09 PM CDT	Special Weather Statement	HUN	Morgan	51 min
Jul 30, 4:13 PM CDT	Special Weather Statement	HUN	Marshall	47 min
Jul 30, 4:48 PM CDT	Special Weather Statement	HUN	DeKalb	27 min
Jul 30, 5:20 PM CDT	Special Weather Statement	HUN	DeKalb	25 min
Jul 30, 5:26 PM CDT	Special Weather Statement	HUN	Lauderdale	49 min
Jul 30, 5:36 PM CDT	Special Weather Statement	HUN	Jackson	9 min
Jul 30, 5:45 PM CDT	Special Weather Statement	HUN	Limestone, Madison	30 min
Jul 30, 5:46 PM CDT	Special Weather Statement	HUN	Jackson	44 min
Jul 30, 5:58 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence, Limestone	32 min
Jul 30, 6:10 PM CDT	Special Weather Statement	HUN	Lawrence, Limestone, Madison, Morgan	50 min
Jul 30, 6:28 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	32 min
Jul 30, 6:37 PM CDT	Severe Thunderstorm Warning	HUN	Cullman	23 min
Jul 30, 6:55 PM CDT	Special Weather Statement	HUN	Cullman, DeKalb, Lawrence, Marshall, Morgan	50 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.