Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Huntsville, AL

August 18, 2021Franklin County, Tennessee

NWS Huntsville, AL issued this special weather statement at Aug 18, 2021, 8:36 PM CDT for Franklin County, Tennessee. It was in force for 24 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: Aug 18, 2021, 8:36 PM CDT (01:36 UTC)
Expired: Aug 18, 2021, 9:00 PM CDT
In force: 24 min
Issued by: NWS Huntsville, AL
Hail: 0.00 in
Wind: 40

County Franklin County, TN

The radar

The Northeast Alabama radar (KHTX), 28 km from the middle of the area, began a volume at 01:39 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, 1.6 hours before the alert went out and 122 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: 576 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

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 Aug 18, 7:37 PM CDT, 59 minutes earlier.

Area forecast discussion, Aug 18, 7:37 PM CDT, 59 minutes before

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Hazardous weather outlook, Aug 18, 2:27 PM CDT, 6 hours 9 minutes before

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In the hours before

Special weather statement, Aug 18, 4:51 PM CDT, 3 hours 45 minutes before

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Local storm report, Aug 18, 8:04 PM CDT, 32 minutes before

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Special weather statement, Aug 18, 8:36 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
Aug 18, 7:39 PM CDT	Severe Thunderstorm Warning	HUN	Madison	36 min
Aug 19, 8:17 AM CDT	Special Weather Statement	HUN	Morgan	43 min
Aug 19, 9:04 AM CDT	Special Weather Statement	HUN	Cullman, Morgan	41 min
Aug 19, 9:47 AM CDT	Flash Flood Warning	HUN	Cullman	3 hr
Aug 19, 10:32 AM CDT	Special Weather Statement	HUN	Marshall	43 min
Aug 19, 11:05 AM CDT	Special Weather Statement	HUN	DeKalb	55 min
Aug 19, 11:58 AM CDT	Special Weather Statement	HUN	DeKalb	32 min
Aug 19, 1:06 PM CDT	Areal Flood Warning	HUN	Cullman	39 min
Aug 19, 2:22 PM CDT	Special Weather Statement	HUN	Franklin	38 min
Aug 19, 2:49 PM CDT	Special Weather Statement	HUN	Franklin	41 min
Aug 19, 4:45 PM CDT	Flash Flood Warning Emergency	HUN	Franklin	3 hr
Aug 19, 5:51 PM CDT	Flash Flood Warning	HUN	Franklin	2 hr
Aug 19, 6:18 PM CDT	Special Weather Statement	HUN	Madison	27 min
Aug 19, 6:45 PM CDT	Special Weather Statement	HUN	Madison	45 min

Nearby

Special Weather Statements in Tennessee, 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.