Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 55, NWS Huntsville, AL

May 22, 2020Colbert County, Lauderdale County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at May 22, 2020, 7:09 PM CDT for Colbert County, Lauderdale County, Alabama. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 22, 2020, 7:09 PM CDT (00:09 UTC)
Expired
May 22, 2020, 7:34 PM CDT
In force
25 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Colbert County, AL, Lauderdale County, AL

The radar

The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 00:13 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, 0.2 hours before the alert went out and 180 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 2020-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 167 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2020-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.193958Sfc1 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
167 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
857 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Huntsville, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 22, 6:54 PM CDT, 15 minutes earlier.

Area forecast discussion, May 22, 6:54 PM CDT, 15 minutes before
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Hazardous weather outlook, May 22, 2:12 PM CDT, 4 hours 57 minutes before
Hazardous Weather Outlook
National Weather Service Huntsville AL
212 PM CDT Fri May 22 2020

ALZ001>010-016-TNZ076-096-097-231015-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
212 PM CDT Fri May 22 2020

This Hazardous Weather Outlook is for north Alabama and portions of
southern middle Tennessee.

.DAY ONE...Tonight...

Isolated thunderstorms are possible, mainly during the evening hours.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Chances for thunderstorms will occur each day mainly during the
afternoons and evenings through at least Thursday.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management personnel is
not anticipated at this time.

In the hours before

Special weather statement, May 22, 7:02 PM CDT, 7 minutes before
Special Weather Statement
National Weather Service Huntsville AL
702 PM CDT Fri May 22 2020

ALZ001-002-230030-
Lauderdale AL-Colbert AL-
702 PM CDT Fri May 22 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LAUDERDALE AND
NORTHWESTERN COLBERT COUNTIES UNTIL 730 PM CDT...

At 701 PM CDT, Doppler radar was tracking a strong thunderstorm over
Pickwick Dam, or near Pickwick Landing State Park, moving southeast
at 30 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Waterloo and Riverton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike several miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.

If on or near Pickwick Dam, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 3501 8796 3500 8795 3478 8805 3482 8811
      3489 8810 3492 8816 3496 8817 3500 8820
      3501 8820
TIME...MOT...LOC 0001Z 294DEG 26KT 3503 8828

KTW

The office that day

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

IssuedProductOfficeCountiesLasted
May 22, 7:28 PM CDTSpecial Weather StatementHUNMorgan47 min
May 22, 7:42 PM CDTSpecial Weather StatementHUNColbert, Lauderdale48 min
May 22, 7:53 PM CDTSpecial Weather StatementHUNBlount22 min
May 22, 8:14 PM CDTSpecial Weather StatementHUNLimestone46 min
May 22, 8:18 PM CDTSevere Thunderstorm WarningHUNCullman, Morgan27 min
May 22, 8:26 PM CDTSpecial Weather StatementHUNMarshall34 min
May 22, 8:30 PM CDTSevere Thunderstorm WarningHUNMarshall16 min
May 22, 9:00 PM CDTSevere Thunderstorm WarningHUNMadison34 min
May 22, 9:08 PM CDTSpecial Weather StatementHUNLimestone52 min
May 22, 9:26 PM CDTSpecial Weather StatementHUNJackson49 min
May 22, 9:30 PM CDTSevere Thunderstorm WarningHUNJackson19 min
May 23, 9:43 AM CDTSpecial Weather StatementHUNFranklin32 min
May 23, 4:11 PM CDTSpecial Weather StatementHUNFranklin19 min
May 23, 4:44 PM CDTSpecial Weather StatementHUNColbert46 min
May 23, 5:13 PM CDTSpecial Weather StatementHUNLawrence32 min
May 23, 6:05 PM CDTSpecial Weather StatementHUNLawrence40 min
May 23, 6:24 PM CDTSpecial Weather StatementHUNLimestone36 min
May 23, 6:28 PM CDTSpecial Weather StatementHUNCullman17 min
May 23, 6:45 PM CDTSpecial Weather StatementHUNCullman, Morgan30 min
May 23, 6:49 PM CDTSpecial Weather StatementHUNLimestone26 min
May 22, 9:42 PM CDTSpecial Weather StatementHUNFranklin18 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2020Every severe thunderstorm warning in 2020

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.