Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Huntsville, AL

July 30, 20214 counties in Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 30, 2021, 7:19 PM CDT for 4 counties in Alabama. It was in force for 26 min. 1 report 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: Jul 30, 2021, 7:19 PM CDT (00:19 UTC)
Expired: Jul 30, 2021, 7:45 PM CDT
In force: 26 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, Madison County, AL, Marshall County, AL

The radar

The Northeast Alabama radar (KHTX), 72 km from the middle of the area, began a volume at 00:22 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
Jul 30, 7:33 PM CDT	TSTM WND DMG	5 Nne Douglas, AL	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 5 NNE DOUGLAS. TWO TREES DOWN AT 5180 HIGHPOINT ROAD IN HORTON. TIME ESTIMATED BY RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.3 hours before the alert went out and 134 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: 2302 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1114 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

070 
WUUS54 KHUN 310019
SVRHUN
ALC049-071-089-095-310045-
/O.NEW.KHUN.SV.W.0071.210731T0019Z-210731T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
719 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...
  Marshall County in northeastern Alabama...
  Southeastern Madison County in north central Alabama...
  Southwestern DeKalb County in northeastern Alabama...

* Until 745 PM CDT.

* At 719 PM CDT, a severe thunderstorm was located over Grant, or 10
  miles north of Guntersville, moving south at 15 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, Owens Cross
  Roads, Fyffe, Powell, Grant and Geraldine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3420 8611 3419 8610 3418 8620 3418 8638
      3430 8648 3430 8657 3459 8653 3457 8591
      3420 8586
TIME...MOT...LOC 0019Z 339DEG 15KT 3450 8628 

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

KTW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 7:45 PM CDT	Special Weather Statement	HUN	Cullman	45 min
Jul 30, 7:45 PM CDT	Severe Thunderstorm Warning	HUN	Marshall	19 min
Jul 30, 7:50 PM CDT	Special Weather Statement	HUN	Colbert	25 min
Jul 30, 8:25 PM CDT	Special Weather Statement	HUN	Lauderdale	50 min
Jul 30, 8:32 PM CDT	Special Weather Statement	HUN	Cullman	28 min
Jul 30, 8:37 PM CDT	Special Weather Statement	HUN	Morgan	23 min
Jul 30, 8:46 PM CDT	Special Weather Statement	HUN	Colbert, Franklin, Lawrence	44 min
Jul 30, 9:05 PM CDT	Special Weather Statement	HUN	Lawrence	25 min
Jul 30, 9:25 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Morgan	35 min
Jul 30, 10:00 PM CDT	Special Weather Statement	HUN	Cullman, Lawrence	30 min
Jul 31, 2:12 PM CDT	Special Weather Statement	HUN	Cullman	48 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.