Alert archive / Tennessee / Special Weather Statements in 2011

Special Weather Statement, NWS Nashville, TN

July 12, 2011Cannon County, Tennessee

NWS Nashville, TN issued this special weather statement at Jul 12, 2011, 1:48 PM CDT for Cannon County, Tennessee. It was in force for 27 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 12, 2011, 1:48 PM CDT (18:48 UTC)
Expired: Jul 12, 2011, 2:15 PM CDT
In force: 27 min
Issued by: NWS Nashville, TN

County Cannon County, TN

The radar

The Nashville radar (KOHX), 62 km from the middle of the area, began a volume at 18:49 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, 6.8 hours before the alert went out and 55 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: 2386 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Nashville, TN wrote its last area forecast discussion before this special weather statement went out at Jul 12, 1:00 PM CDT, 48 minutes earlier.

Area forecast discussion, Jul 12, 1:00 PM CDT, 48 minutes before

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Hazardous weather outlook, Jul 12, 6:12 AM CDT, 7 hours 36 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
612 AM CDT TUE JUL 12 2011

TNZ005>011-022>034-056>066-075-077>080-093>095-131030-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON-
HOUSTON-HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-
SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS-
WILLIAMSON-MAURY-MARSHALL-RUTHERFORD-CANNON-DE KALB-WHITE-
CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-
GILES-
612 AM CDT TUE JUL 12 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT...

AN EXCESSIVE HEAT WARNING IS IN EFFECT FOR EXTREME NORTHWEST
MIDDLE TENNESSEE, WHILE A HEAT ADVISORY IS EFFECT FOR THE
REMAINDER OF MIDDLE TENNESSEE AND PARTS OF THE CUMBERLAND PLATEAU.
HEAT INDICES WILL RANGE FROM 105 TO 112 DEGREES THIS AFTERNOON
ACROSS MOST OF THE MID STATE AS TEMPERATURES ONCE AGAIN SOAR AND
RELATIVE HUMIDITIES REMAIN HIGH.

SCATTERED THUNDERSTORMS ARE POSSIBLE TODAY. SOME OF THE STORMS MAY
BECOME SEVERE, WITH DAMAGING STRAIGHT-LINE WINDS THE PRIMARY THREAT.
ALSO, TODAY'S STORMS WILL TEND TO BE SLOW MOVERS, AND MAY THEREFORE
PRODUCE HIGH RAINFALL AMOUNTS AND BRIEF, LOCALIZED FLOODING,
ESPECIALLY IN URBAN AND LOW-LYING AREAS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER CALL TO ACTION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

ROSE

In the hours before

Local storm report, Jul 12, 12:51 PM CDT, 57 minutes before

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Special weather statement, Jul 12, 12:52 PM CDT, 56 minutes before

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Local storm report, Jul 12, 1:02 PM CDT, 46 minutes before

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Special weather statement, Jul 12, 1:19 PM CDT, 29 minutes before

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Special weather statement, Jul 12, 1:23 PM CDT, 25 minutes before

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Special weather statement, Jul 12, 1:48 PM CDT, 0 minutes before

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The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 9:30 AM CDT	Special Weather Statement	OHX	Pickett	15 min
Jul 12, 10:06 AM CDT	Flash Flood Warning	OHX	Overton	3 hr
Jul 12, 11:15 AM CDT	Special Weather Statement	OHX	Putnam	30 min
Jul 12, 11:45 AM CDT	Special Weather Statement	OHX	Jackson, Putnam	45 min
Jul 12, 11:57 AM CDT	Flash Flood Warning	OHX	Putnam	3 hr
Jul 12, 12:15 PM CDT	Severe Thunderstorm Warning	OHX	Macon	30 min
Jul 12, 12:34 PM CDT	Special Weather Statement	OHX	DeKalb	26 min
Jul 12, 12:42 PM CDT	Special Weather Statement	OHX	Smith	63 min
Jul 12, 12:52 PM CDT	Special Weather Statement	OHX	Smith	23 min
Jul 12, 1:19 PM CDT	Special Weather Statement	OHX	DeKalb	26 min
Jul 12, 1:23 PM CDT	Special Weather Statement	OHX	Cannon	22 min

Nearby

Special Weather Statements in Tennessee, 2011 Every special weather statement in 2011

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.