Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Huntsville, AL

March 27, 2021Franklin County, Tennessee

NWS Huntsville, AL issued this special weather statement at Mar 27, 2021, 7:47 PM CDT for Franklin County, Tennessee. It was in force for 28 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: Mar 27, 2021, 7:47 PM CDT (00:47 UTC)
Expired: Mar 27, 2021, 8:15 PM CDT
In force: 28 min
Issued by: NWS Huntsville, AL

County Franklin County, TN

The radar

The Northeast Alabama radar (KHTX), 29 km from the middle of the area, began a volume at 00:47 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, 0.8 hours before the alert went out and 124 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: 200 J/kg
Mixed-layer CIN: -290 J/kg
Mixed-layer LCL: 839 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 458 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

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 Mar 27, 6:52 PM CDT, 55 minutes earlier.

Area forecast discussion, Mar 27, 6:52 PM CDT, 55 minutes before

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Hazardous weather outlook, Mar 27, 12:59 PM CDT, 6 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Huntsville AL
1259 PM CDT Sat Mar 27 2021

ALZ001>007-009-TNZ076-096-097-281200-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Jackson-Moore-Lincoln-Franklin TN-
1259 PM CDT Sat Mar 27 2021

...FLASH FLOOD WATCH IN EFFECT FROM THROUGH 7 PM SUNDAY EVENING...

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

.DAY ONE...This Afternoon and Tonight...

Scattered thunderstorms will become more numerous this afternoon,
especially across southern middle Tennessee and far north Alabama.
Large hail, perhaps a few tornadoes, and damaging wind will be
possible, along with locally excessive rainfall.

Tonight, a line of strong to severe thunderstorms is likely to move
through from northwest to southeast across the area. Damaging winds,
large hail, and possibly tornadoes are the expected severe weather
hazards. Also, locally excessive rainfall may result in flash
flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

The line of strong to severe thunderstorms will exit during the
morning hours. The threat of excessive rainfall and flash flooding
will diminish during the afternoon.

A chance of thunderstorms exists again Tuesday night into Wednesday.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management personnel is
possible, especially tonight into early Sunday morning.

ALZ008-010-016-281200-
Marshall-DeKalb-Cullman-
1259 PM CDT Sat Mar 27 2021

This Hazardous Weather Outlook is for north central Alabama and
northeast Alabama.

.DAY ONE...This Afternoon and Tonight...

Scattered thunderstorms will become more numerous this afternoon,
especially across southern middle Tennessee and far north Alabama.
Large hail, damaging winds, and perhaps a few tornadoes will be
possible.

Tonight, a line of strong to severe thunderstorms is likely to move
from northwest to southeast across the area. Damaging winds, large
hail, and possibly tornadoes are the expected severe weather hazards.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

The line of strong to severe thunderstorms will exit during the
morning hours. A chance of thunderstorms exists again Tuesday night
into Wednesday.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management personnel is
possible, especially tonight into early Sunday morning.

20

In the hours before

Local storm report, Mar 27, 7:39 PM CDT, 8 minutes before

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Local storm report, Mar 27, 7:42 PM CDT, 5 minutes before

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Local storm report, Mar 27, 7:43 PM CDT, 4 minutes before

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Local storm report, Mar 27, 7:44 PM CDT, 3 minutes before

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Local storm report, Mar 27, 7:46 PM CDT, 1 minute before

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Special weather statement, Mar 27, 7:47 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
Mar 28, 12:31 AM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	44 min
Mar 28, 1:13 AM CDT	Special Weather Statement	HUN	Lauderdale	47 min
Mar 28, 1:52 AM CDT	Flash Flood Warning	HUN	Lauderdale	3 hr
Mar 28, 2:39 AM CDT	Special Weather Statement	HUN	Colbert	51 min
Mar 28, 2:45 AM CDT	Special Weather Statement	HUN	Franklin	45 min
Mar 28, 3:09 AM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lawrence	36 min
Mar 28, 3:34 AM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Morgan	26 min
Mar 28, 3:58 AM CDT	Severe Thunderstorm Warning	HUN	Jackson, Limestone, Madison, Morgan	47 min
Mar 28, 4:26 AM CDT	Severe Thunderstorm Warning	HUN	Jackson	34 min
Mar 28, 4:46 AM CDT	Severe Thunderstorm Warning	HUN	Jackson, Limestone, Madison, Morgan	44 min
Mar 28, 5:02 AM CDT	Severe Thunderstorm Warning	HUN	Cullman	28 min
Mar 28, 5:21 AM CDT	Severe Thunderstorm Warning	HUN	Jackson	24 min
Mar 28, 5:30 AM CDT	Severe Thunderstorm Warning	HUN	Cullman	30 min
Mar 28, 5:41 AM CDT	Areal Flood Warning	HUN	Madison	3 hr
Mar 28, 5:57 AM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Marshall	33 min
Mar 28, 6:26 AM CDT	Special Weather Statement	HUN	DeKalb	34 min
Mar 28, 2:18 AM CDT	Special Weather Statement	HUN	Lincoln, Moore	42 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.