Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 80, NWS Huntsville, AL

August 18, 2021Lincoln County, Tennessee; Madison County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Aug 18, 2021, 7:39 PM CDT for Lincoln County, Tennessee; Madison County, Alabama. It was in force for 36 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
Aug 18, 2021, 7:39 PM CDT (00:39 UTC)
Expired
Aug 18, 2021, 8:15 PM CDT
In force
36 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Madison County, AL, Lincoln County, TN

The radar

The Northeast Alabama radar (KHTX), 29 km from the middle of the area, began a volume at 00:42 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

Nashville Metro, TN (KBNA), launched 00:00Z, 0.7 hours before the alert went out and 131 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-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 2021-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 576 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2021-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
576 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
656 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

959 
WUUS54 KHUN 190039
SVRHUN
ALC089-TNC103-190115-
/O.NEW.KHUN.SV.W.0080.210819T0039Z-210819T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
739 PM CDT Wed Aug 18 2021

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  Northeastern Madison County in north central Alabama...
  Southeastern Lincoln County in Middle Tennessee...

* Until 815 PM CDT

* At 739 PM CDT, a severe thunderstorm was located near Hazel Green,
  or 9 miles north of Meridianville, moving east at 30 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Hazel Green, New Market, Lincoln, Plevna, Flintville, Elora,
  Belleview, Fisk and Crystal Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3503 8632 3490 8633 3489 8634 3487 8635
      3484 8634 3496 8663 3505 8662 3510 8632
TIME...MOT...LOC 0039Z 275DEG 24KT 3499 8653 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

09
2 follow-up statements
229 
WWUS54 KHUN 190100
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
800 PM CDT Wed Aug 18 2021

ALC089-TNC103-190115-
/O.CON.KHUN.SV.W.0080.000000T0000Z-210819T0115Z/
Madison AL-Lincoln TN-
800 PM CDT Wed Aug 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR NORTHEASTERN MADISON AND SOUTHEASTERN LINCOLN COUNTIES...

At 759 PM CDT, a severe thunderstorm was located near New Market, or
12 miles northeast of Moores Mill, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Hazel Green, New Market, Lincoln, Plevna, Flintville, Elora,
Belleview, Fisk and Crystal Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3503 8632 3490 8633 3489 8634 3487 8635
      3484 8634 3496 8663 3505 8662 3510 8632
TIME...MOT...LOC 0059Z 275DEG 24KT 3498 8636 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RSB
492 
WWUS54 KHUN 190106
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
806 PM CDT Wed Aug 18 2021

ALC089-TNC103-190115-
/O.EXP.KHUN.SV.W.0080.000000T0000Z-210819T0115Z/
Madison AL-Lincoln TN-
806 PM CDT Wed Aug 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MADISON AND
SOUTHEASTERN LINCOLN COUNTIES WILL EXPIRE AT 815 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds are still possible with
this thunderstorm.

LAT...LON 3503 8632 3490 8633 3489 8634 3487 8635
      3484 8634 3496 8663 3505 8662 3510 8632
TIME...MOT...LOC 0105Z 275DEG 24KT 3498 8633 

$$

RSB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:36 PM CDTSpecial Weather StatementHUNFranklin24 min
Aug 19, 8:17 AM CDTSpecial Weather StatementHUNMorgan43 min
Aug 19, 9:04 AM CDTSpecial Weather StatementHUNCullman, Morgan41 min
Aug 19, 9:47 AM CDTFlash Flood WarningHUNCullman3 hr
Aug 19, 10:32 AM CDTSpecial Weather StatementHUNMarshall43 min
Aug 19, 11:05 AM CDTSpecial Weather StatementHUNDeKalb55 min
Aug 19, 11:58 AM CDTSpecial Weather StatementHUNDeKalb32 min
Aug 19, 1:06 PM CDTAreal Flood WarningHUNCullman39 min
Aug 19, 2:22 PM CDTSpecial Weather StatementHUNFranklin38 min
Aug 19, 2:49 PM CDTSpecial Weather StatementHUNFranklin41 min
Aug 19, 4:45 PM CDTFlash Flood Warning EmergencyHUNFranklin3 hr
Aug 19, 5:51 PM CDTFlash Flood WarningHUNFranklin2 hr
Aug 19, 6:18 PM CDTSpecial Weather StatementHUNMadison27 min
Aug 19, 6:45 PM CDTSpecial Weather StatementHUNMadison45 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2021Severe Thunderstorm Warnings in Alabama, 2021Every 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.