Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Huntsville, AL

July 27, 2021Cullman County, Alabama

NWS Huntsville, AL issued this special weather statement at Jul 27, 2021, 6:22 PM CDT for Cullman County, Alabama. It was in force for 38 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 27, 2021, 6:22 PM CDT (23:22 UTC)
Expired
Jul 27, 2021, 7:00 PM CDT
In force
38 min
Issued by
NWS Huntsville, AL

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 110 km from the middle of the area, began a volume at 23:24 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, 11.4 hours before the alert went out and 109 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 2021-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1546 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 2021-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
1546 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
923 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
-17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 27, 6:20 PM CDT, 2 minutes earlier.

Area forecast discussion, Jul 27, 6:20 PM CDT, 2 minutes before
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Hazardous weather outlook, Jul 27, 2:33 PM CDT, 3 hours 49 minutes before
Hazardous Weather Outlook
National Weather Service Huntsville AL
233 PM CDT Tue Jul 27 2021

ALZ001>010-016-TNZ076-096-097-281145-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
233 PM CDT Tue Jul 27 2021

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

.DAY ONE...Tonight...

Isolated to scattered thunderstorms will remain possible this
afternoon before dissipating early this evening. Expect storm
coverage to be more widespread east of the I-65 corridor. A few of
the strongest storms could produce wind gusts around 55 MPH, as well
as frequent lightning and locally heavy downpours. Storms are
expected to dissipate during the early evening hours.

A dangerous combination of heat and humidity will result in heat
index readings in the 105-107 degree range across portions of
northwest Alabama this afternoon. A Heat Advisory is in effect for
this region through 7 PM CDT today.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

A short-lived heat wave is expected across the Tennessee Valley
later this week, with dangerously high heat indices in the 105-110
degree range for a portions of northern Alabama and southern middle
Tennessee possible on Thursday and Friday.

Isolated thunderstorms will be possible across our southern Middle
Tennessee counties late Friday afternoon and Friday night, as a cold
front approaches the region from the north. The front will stall
across the region this weekend, resulting in several rounds of
thunderstorms from Saturday night through Monday. Conditions appear
favorable for strong to severe thunderstorms, especially on Sunday
and Sunday night.

.SPOTTER CALL TO ACTION STATEMENT...

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

20

In the hours before

Special weather statement, Jul 27, 2:51 PM CDT, 3 hours 31 minutes before
Special Weather Statement
National Weather Service Huntsville AL
251 PM CDT Tue Jul 27 2021

ALZ008>010-272015-
Marshall AL-DeKalb AL-Jackson AL-
251 PM CDT Tue Jul 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL JACKSON...
NORTHEASTERN MARSHALL AND WEST CENTRAL DEKALB COUNTIES UNTIL 315 PM
CDT...

At 251 PM CDT, Doppler radar was tracking a strong thunderstorm near
Section, or 7 miles south of Scottsboro, moving south at 10 mph.

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

Locations impacted include...
Scottsboro, Fyffe, Section and Langston.

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.

&&

LAT...LON 3464 8618 3465 8597 3442 8590 3441 8622
TIME...MOT...LOC 1951Z 357DEG 7KT 3458 8608

RSB
Special weather statement, Jul 27, 3:54 PM CDT, 2 hours 28 minutes before
Special Weather Statement
National Weather Service Huntsville AL
354 PM CDT Tue Jul 27 2021

ALZ009-010-272145-
DeKalb AL-Jackson AL-
354 PM CDT Tue Jul 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN JACKSON AND NORTHEASTERN
DEKALB COUNTIES UNTIL 445 PM CDT...

At 354 PM CDT, Doppler radar was tracking a strong thunderstorm near
Ider, or 8 miles southwest of Trenton, moving south at 20 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Fort Payne, Henagar, Sylvania, Ider, Valley Head, Hammondville,
Mentone, Sulpher Springs and Desoto State Park.

LAT...LON 3450 8555 3450 8556 3449 8556 3448 8558
      3447 8558 3450 8581 3484 8565 3483 8558
      3453 8551
TIME...MOT...LOC 2054Z 011DEG 16KT 3477 8558

05/MA
Special weather statement, Jul 27, 4:12 PM CDT, 2 hours 10 minutes before
Special Weather Statement
National Weather Service Huntsville AL
412 PM CDT Tue Jul 27 2021

ALZ010-272200-
DeKalb AL-
412 PM CDT Tue Jul 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DEKALB COUNTY UNTIL
500 PM CDT...

At 411 PM CDT, Doppler radar was tracking a strong thunderstorm near
Little River Canyon National Preserve, moving north at 5 mph.

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

Locations impacted include...
Fort Payne, Rainsville, Pine Ridge, Lebanon, Dog Town, Collbran,
Adamsburg, Desoto State Park and Little River Canyon NP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Very heavy rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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.

&&

LAT...LON 3448 8558 3447 8557 3444 8558 3441 8561
      3437 8563 3436 8566 3434 8568 3426 8578
      3447 8589 3453 8557 3449 8557
TIME...MOT...LOC 2111Z 167DEG 6KT 3436 8570

05/MA
Special weather statement, Jul 27, 5:01 PM CDT, 1 hour 21 minutes before
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Special weather statement, Jul 27, 5:40 PM CDT, 42 minutes before
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Special weather statement, Jul 27, 6:22 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 4:32 AM CDTHeat AdvisoryHUNColbert, Franklin, Lauderdale, Lawrence14 hr
Jul 27, 2:51 PM CDTSpecial Weather StatementHUNDeKalb24 min
Jul 27, 3:54 PM CDTSpecial Weather StatementHUNDeKalb51 min
Jul 27, 4:12 PM CDTSpecial Weather StatementHUNDeKalb48 min
Jul 27, 5:01 PM CDTSpecial Weather StatementHUNDeKalb44 min
Jul 27, 5:40 PM CDTSpecial Weather StatementHUNCullman50 min

Nearby

Special Weather Statements in Alabama, 2021Every special weather statement 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.