Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Huntsville, AL

April 9, 2021DeKalb County, Alabama

NWS Huntsville, AL issued this special weather statement at Apr 9, 2021, 2:23 PM CDT for DeKalb County, Alabama. It was in force for 52 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: Apr 9, 2021, 2:23 PM CDT (19:23 UTC)
Expired: Apr 9, 2021, 3:15 PM CDT
In force: 52 min
Issued by: NWS Huntsville, AL

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 63 km from the middle of the area, began a volume at 19:25 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.4 hours before the alert went out and 164 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: 503 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 908 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Apr 9, 12:11 PM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Apr 9, 12:11 PM CDT, 2 hours 12 minutes before

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Hazardous weather outlook, Apr 9, 1:40 PM CDT, 43 minutes before

Hazardous Weather Outlook
National Weather Service Huntsville AL
140 PM CDT Fri Apr 9 2021

ALZ001>010-016-TNZ076-096-097-100945-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
140 PM CDT Fri Apr 9 2021

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

.DAY ONE...This Afternoon through Tonight...

Multiple rounds of strong to severe thunderstorms are expected this
afternoon, evening, and into the overnight hours. Damaging winds,
large hail, and a few tornadoes will be possible with these storms.
Additionally, heavy rainfall may lead to localized flash flooding
issues as well as rises on rivers, creeks and streams.

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

Strong to severe thunderstorms will be possible Saturday morning as a
cold front pushes through the Tennessee Valley. Damaging winds,
heavy rainfall, and localized flooding will be the main threats, but
an isolated tornado or two cannot be ruled out.

Isolated to scattered storms will be possible Wednesday and Thursday.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
later tonight and into Saturday morning.

In the hours before

Special weather statement, Apr 9, 1:04 PM CDT, 1 hour 19 minutes before

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Special weather statement, Apr 9, 2:12 PM CDT, 11 minutes before

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Special weather statement, Apr 9, 2:23 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Huntsville AL
223 PM CDT Fri Apr 9 2021

ALZ010-092015-
DeKalb AL-
223 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL DEKALB COUNTY UNTIL
315 PM CDT...

At 222 PM CDT, Doppler radar was tracking a strong thunderstorm near
Fort Payne, moving northeast at 15 mph. Pea sized hail was reported
with this storm east of Fort Payne.

Up to nickel size hail and winds in excess of 40 mph will be
possible with this storm.

Locations impacted include...
Fort Payne, Rainsville, Henagar, Sylvania, Valley Head, Hammondville,
Mentone, Pine Ridge, Collbran and Adamsburg.

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 3450 8555 3450 8556 3449 8556 3448 8558
      3448 8557 3435 8569 3437 8583 3465 8576
      3467 8575 3461 8553 3454 8552
TIME...MOT...LOC 1922Z 212DEG 12KT 3442 8577

30

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 7:27 PM CDT	River Flood Warning	HUN	Madison	18 hr
Apr 9, 1:04 PM CDT	Special Weather Statement	HUN	Cullman	56 min
Apr 9, 1:41 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone	34 min
Apr 9, 2:12 PM CDT	Special Weather Statement	HUN	Limestone	48 min
Apr 9, 2:33 PM CDT	Special Weather Statement	HUN	Cullman	42 min
Apr 9, 2:40 PM CDT	Severe Thunderstorm Warning	HUN	Cullman	25 min
Apr 9, 2:46 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	29 min
Apr 9, 3:09 PM CDT	Special Weather Statement	HUN	Madison	51 min
Apr 9, 3:45 PM CDT	Special Weather Statement	HUN	Cullman	45 min
Apr 9, 3:47 PM CDT	Special Weather Statement	HUN	Morgan	43 min
Apr 9, 3:52 PM CDT	Severe Thunderstorm Warning	HUN	Limestone	38 min
Apr 9, 4:10 PM CDT	Special Weather Statement	HUN	Limestone	35 min
Apr 9, 4:51 PM CDT	Special Weather Statement	HUN	Lincoln	39 min

Nearby

Special Weather Statements in Alabama, 2021 Every 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.