Alert archive / Tennessee / Special Weather Statements in 2016

Special Weather Statement, NWS Huntsville, AL

August 18, 2016Franklin County, Tennessee

NWS Huntsville, AL issued this special weather statement at Aug 18, 2016, 5:21 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, 2016, 5:21 PM CDT (22:21 UTC)
Expired: Aug 18, 2016, 5:45 PM CDT
In force: 24 min
Issued by: NWS Huntsville, AL

County Franklin County, TN

The radar

The Northeast Alabama radar (KHTX), 37 km from the middle of the area, began a volume at 22:22 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 12:00Z, 10.4 hours before the alert went out and 113 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: 354 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 723 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Aug 18, 3:48 PM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, Aug 18, 3:48 PM CDT, 1 hour 33 minutes before

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Hazardous weather outlook, Aug 18, 1:50 PM CDT, 3 hours 31 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
150 PM CDT THU AUG 18 2016

ALZ001>010-016-TNZ076-096-097-191015-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DE KALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
150 PM CDT THU AUG 18 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS OF
SOUTHERN MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SCATTERED THUNDERSTORMS REMAIN POSSIBLE THROUGH THE REMAINDER OF THE
AFTERNOON PERIOD AND INTO THE EVENING AND OVERNIGHT HOURS. LOCALLY
HEAVY DOWNPOURS AND BRIEF GUSTY WINDS ARE POSSIBLE WITH SOME OF THE
STRONGER STORMS. MINOR FLOODING IS POSSIBLE WITH AREAS THAT RECEIVE
MULTIPLE EPISODES OF HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED DURING THE PERIOD
FROM FRIDAY THROUGH SUNDAY AS SEVERAL UPPER LEVEL DISTURBANCES TRACK
ACROSS THE REGION AND INTERACT WITH A VERY MOIST AIRMASS. LOCALLY
HEAVY RAINFALL AND BRIEF GUSTY WINDS ARE AGAIN POSSIBLE WITH SOME OF
THESE STORMS. A COLD FRONT IS THEN EXPECTED TO PUSH SOUTHEASTWARD
AND BRING AND AN END TO THE STORMS FROM NORTHWEST TO SOUTHEAST BY
SUNDAY EVENING.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL IS
NOT ANTICIPATED AT THIS TIME.

In the hours before

Local storm report, Aug 18, 3:10 PM CDT, 2 hours 11 minutes before

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Special weather statement, Aug 18, 3:28 PM CDT, 1 hour 53 minutes before

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Special weather statement, Aug 18, 4:11 PM CDT, 1 hour 10 minutes before

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Special weather statement, Aug 18, 4:36 PM CDT, 45 minutes before

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Special weather statement, Aug 18, 4:55 PM CDT, 26 minutes before

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Special weather statement, Aug 18, 5:21 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
Aug 18, 1:18 PM CDT	Special Weather Statement	HUN	Marshall	27 min
Aug 18, 1:59 PM CDT	Flash Flood Warning	HUN	Limestone, Morgan	2 hr
Aug 18, 2:46 PM CDT	Special Weather Statement	HUN	DeKalb	29 min
Aug 18, 3:28 PM CDT	Special Weather Statement	HUN	Jackson	32 min
Aug 18, 4:11 PM CDT	Special Weather Statement	HUN	Jackson	49 min
Aug 18, 4:36 PM CDT	Special Weather Statement	HUN	Cullman	24 min
Aug 18, 5:52 PM CDT	Special Weather Statement	HUN	Limestone	23 min
Aug 18, 4:54 AM CDT	Special Weather Statement	HUN	Moore	51 min
Aug 18, 5:50 AM CDT	Special Weather Statement	HUN	Moore	40 min

Nearby

Special Weather Statements in Tennessee, 2016 Every special weather statement in 2016

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.