Alert archive / Alabama / Special Weather Statements in 2020

Special Weather Statement, NWS Huntsville, AL

July 21, 2020DeKalb County, Alabama

NWS Huntsville, AL issued this special weather statement at Jul 21, 2020, 6:21 PM CDT for DeKalb County, Alabama. It was in force for 9 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 21, 2020, 6:21 PM CDT (23:21 UTC)
Expired: Jul 21, 2020, 6:30 PM CDT
In force: 9 min
Issued by: NWS Huntsville, AL

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 47 km from the middle of the area, began a volume at 23:37 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, 11.4 hours before the alert went out and 179 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: -111 J/kg
Mixed-layer LCL: 1197 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: -10 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 21, 5:38 PM CDT, 43 minutes earlier.

Area forecast discussion, Jul 21, 5:38 PM CDT, 43 minutes before

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Hazardous weather outlook, Jul 21, 2:40 PM CDT, 3 hours 41 minutes before

Hazardous Weather Outlook
National Weather Service Huntsville AL
240 PM CDT Tue Jul 21 2020

ALZ001>010-016-TNZ076-096-097-221045-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
240 PM CDT Tue Jul 21 2020

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

.DAY ONE...Tonight...

Scattered thunderstorms are possible this afternoon and evening with
the primary threats posed by any stronger storms being lightning,
gusty winds, and brief heavy rainfall.

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

Thunderstorms will increase in coverage again on Wednesday and
continue through at least Friday. Some of these thunderstorms during
this time period may be capable of producing strong gusty winds and
locally heavy rainfall. Thunderstorm chances will continue through
the weekend into early next week.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, Jul 21, 5:36 PM CDT, 45 minutes before

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Special weather statement, Jul 21, 5:42 PM CDT, 39 minutes before

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Special weather statement, Jul 21, 5:51 PM CDT, 30 minutes before

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Local storm report, Jul 21, 5:52 PM CDT, 29 minutes before

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Special weather statement, Jul 21, 6:08 PM CDT, 13 minutes before

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Special weather statement, Jul 21, 6:21 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 1:12 PM CDT	Special Weather Statement	HUN	Jackson	48 min
Jul 21, 2:25 PM CDT	Special Weather Statement	HUN	Jackson	50 min
Jul 21, 3:07 PM CDT	Special Weather Statement	HUN	Madison	8 min
Jul 21, 3:22 PM CDT	Special Weather Statement	HUN	Cullman	23 min
Jul 21, 3:36 PM CDT	Special Weather Statement	HUN	Marshall	9 min
Jul 21, 3:38 PM CDT	Severe Thunderstorm Warning	HUN	Marshall	19 min
Jul 21, 3:54 PM CDT	Special Weather Statement	HUN	Cullman	36 min
Jul 21, 4:21 PM CDT	Special Weather Statement	HUN	Franklin	24 min
Jul 21, 4:28 PM CDT	Special Weather Statement	HUN	Lawrence	47 min
Jul 21, 4:37 PM CDT	Special Weather Statement	HUN	Lawrence	23 min
Jul 21, 4:48 PM CDT	Severe Thunderstorm Warning	HUN	Franklin	27 min
Jul 21, 4:55 PM CDT	Special Weather Statement	HUN	Lawrence	35 min
Jul 21, 5:11 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence	34 min
Jul 21, 5:16 PM CDT	Special Weather Statement	HUN	Madison	29 min
Jul 21, 5:21 PM CDT	Special Weather Statement	HUN	DeKalb	39 min
Jul 21, 5:29 PM CDT	Special Weather Statement	HUN	Madison	46 min
Jul 21, 5:32 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	28 min
Jul 21, 5:36 PM CDT	Special Weather Statement	HUN	Colbert	39 min
Jul 21, 5:42 PM CDT	Special Weather Statement	HUN	DeKalb	48 min
Jul 21, 5:51 PM CDT	Special Weather Statement	HUN	Madison	39 min
Jul 21, 5:56 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	34 min
Jul 21, 6:08 PM CDT	Special Weather Statement	HUN	Lauderdale	52 min
Jul 21, 6:40 PM CDT	Special Weather Statement	HUN	Jackson	35 min

Nearby

Special Weather Statements in Alabama, 2020 Every special weather statement 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.