Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 65, NWS Huntsville, AL

June 21, 2020Jackson County, Marshall County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 21, 2020, 2:45 PM CDT for Jackson County, Marshall County, Alabama. It was in force for 30 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
Jun 21, 2020, 2:45 PM CDT (19:45 UTC)
Expired
Jun 21, 2020, 3:15 PM CDT
In force
30 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Jackson County, AL, Marshall County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 7.8 hours before the alert went out and 165 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, Birmingham, AL at 12:00Z on 2020-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 394 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, Birmingham, AL at 12:00Z on 2020-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
394 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1353 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
22 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Jun 21, 2:44 PM CDT, 1 minute earlier.

Area forecast discussion, Jun 21, 2:44 PM CDT, 1 minute before
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Hazardous weather outlook, Jun 21, 4:49 AM CDT, 9 hours 56 minutes before
Hazardous Weather Outlook
National Weather Service Huntsville AL
449 AM CDT Sun Jun 21 2020

ALZ001>010-016-TNZ076-096-097-212330-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
449 AM CDT Sun Jun 21 2020

This Hazardous Weather Outlook is for north central Alabama,
northeast Alabama, northwest Alabama and southern middle Tennessee.

.DAY ONE...Today and tonight.

Scattered thunderstorms will become more widespread in coverage
today, as an upper disturbance crosses into the region from the
west. Some of these storms may be strong producing brief heavy
rainfall and gusty winds.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

An extended period of shower and thunderstorm activity is expected
early next week through Wednesday, as a front moves southward into
northern Alabama. Some storms could be strong producing gusty winds
and localized flooding.

After a brief respite from heavier rainfall on Thursday, scattered
shower and thunderstorm activity is expected to return next weekend.

.SPOTTER INFORMATION STATEMENT...

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

20

In the hours before

Special weather statement, Jun 21, 12:42 PM CDT, 2 hours 3 minutes before
Special Weather Statement
National Weather Service Huntsville AL
1242 PM CDT Sun Jun 21 2020

ALZ004-007-016-211830-
Lawrence AL-Morgan AL-Cullman AL-
1242 PM CDT Sun Jun 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CULLMAN...
SOUTHWESTERN MORGAN AND SOUTHEASTERN LAWRENCE COUNTIES UNTIL 130 PM
CDT...

At 1241 PM CDT, Doppler radar was tracking a strong thunderstorm near
Addison, or near Arley, moving northeast at 15 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
West Point, Jones Chapel, Massey, Battleground and eastern Bankhead
National Forest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong gusty winds will be capable of knocking down small tree limbs
along with other small unsecured items. Seek safe shelter until this
storm has passed.

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

&&

LAT...LON 3430 8711 3430 8723 3444 8705 3422 8686
      3410 8711
TIME...MOT...LOC 1741Z 234DEG 15KT 3417 8723

RSB
Special weather statement, Jun 21, 1:16 PM CDT, 1 hour 29 minutes before
Special Weather Statement
National Weather Service Huntsville AL
116 PM CDT Sun Jun 21 2020

ALZ007-008-016-211900-
Marshall AL-Morgan AL-Cullman AL-
116 PM CDT Sun Jun 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL MARSHALL...
NORTHEASTERN CULLMAN AND SOUTHEASTERN MORGAN COUNTIES UNTIL 200 PM
CDT...

At 115 PM CDT, Doppler radar was tracking a strong thunderstorm near
Cullman, moving northeast at 35 mph.

Pea size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Cullman, Arab, Hanceville, Good Hope, Falkville, Holly Pond, Dodge
City, Baldwin, Vinemont and Somerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3400 8688 3430 8701 3456 8669 3431 8642
TIME...MOT...LOC 1815Z 230DEG 30KT 3422 8686

25
Special weather statement, Jun 21, 2:01 PM CDT, 44 minutes before
Special Weather Statement
National Weather Service Huntsville AL
201 PM CDT Sun Jun 21 2020

ALZ008>010-211945-
Marshall AL-DeKalb AL-Jackson AL-
201 PM CDT Sun Jun 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN JACKSON...EAST
CENTRAL MARSHALL AND DEKALB COUNTIES UNTIL 245 PM CDT...

At 159 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms near Geraldine, or 12 miles southwest of Rainsville,
moving northeast at 20 mph.

Pea size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Fort Payne, Rainsville, Henagar, Crossville, Sylvania, Fyffe, Powell,
Geraldine, Section and Ider.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3437 8563 3436 8566 3426 8577 3426 8581
      3424 8581 3424 8584 3420 8585 3420 8611
      3443 8611 3446 8607 3454 8614 3482 8563
      3443 8559
TIME...MOT...LOC 1859Z 239DEG 17KT 3441 8603

25
Special weather statement, Jun 21, 2:11 PM CDT, 34 minutes before
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Special weather statement, Jun 21, 2:36 PM CDT, 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 12:42 PM CDTSpecial Weather StatementHUNCullman48 min
Jun 21, 1:16 PM CDTSpecial Weather StatementHUNCullman44 min
Jun 21, 2:01 PM CDTSpecial Weather StatementHUNDeKalb44 min
Jun 21, 2:11 PM CDTSpecial Weather StatementHUNMarshall49 min
Jun 21, 2:36 PM CDTSpecial Weather StatementHUNJackson39 min
Jun 21, 3:09 PM CDTSpecial Weather StatementHUNJackson51 min
Jun 21, 4:24 PM CDTSpecial Weather StatementHUNCullman36 min
Jun 21, 4:59 PM CDTSpecial Weather StatementHUNFranklin46 min
Jun 21, 5:10 PM CDTSevere Thunderstorm WarningHUNFranklin, Moore16 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.