Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

July 4, 2012Cannon County, Tennessee

NWS Nashville, TN issued this special weather statement at Jul 4, 2012, 6:38 PM CDT for Cannon County, Tennessee. It was in force for 37 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 4, 2012, 6:38 PM CDT (23:38 UTC)
Expired
Jul 4, 2012, 7:15 PM CDT
In force
37 min
Issued by
NWS Nashville, TN

County Cannon County, TN

The radar

The Nashville radar (KOHX), 49 km from the middle of the area, began a volume at 23:39 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 12:00Z, 11.6 hours before the alert went out and 44 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2012-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1214 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2012-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1214 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
1352 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
41 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 4, 1:59 PM CDT, 4 hours 39 minutes earlier.

Area forecast discussion, Jul 4, 1:59 PM CDT, 4 hours 39 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
159 PM CDT WED JUL 4 2012

.DISCUSSION...
TEMPS HAVE PUSHED WELL INTO THE 90'S AT MANY LOCATIONS ACROSS
MIDDLE TENNESSEE WITH UPPER 80S ON THE PLATEAU. SHOULD SEE SOME
TEMPS TOP OUT AT A FEW LOCATIONS AROUND 100 INTERSTATE 65 WEST.
BEGINNING TO SEE ACTIVITY DEVELOPING OVER FAR SOUTHERN ILLINOIS
AND FAR WESTERN KENTUCKY. I LOOK FOR THIS ACTIVITY TO MOVE
SOUTHEASTWARD WITH SCATTERED DEVELOPMENT IN NORTHWEST MIDDLE
TENNESSEE AFTER 20Z. EXPECT WE WILL SEE ISOLATED TO SCATTERED
STORMS IN THE VICINITY OF NASHVILLE BY 23Z IF NOT BEFORE. A FEW
STORMS COULD PRODUCE WET MICROBURSTS WITH STRONG GUSTY WINDS DUE
TO WATER LOADING. ALSO...BEGINNING TO SEE SOME DEVELOPMENT OVER
SOUTHEASTERN MIDDLE TENNESSEE DOWN INTERSTATE 24 IN GRUNDY COUNTY.

WE WILL HAVE A CHANCE FOR STORMS TONIGHT ALL AREAS BUT WILL RUN
A LITTLE HIGHER POPS OVER THE SOUTH AND EAST. WILL KEEP THE HEAT
ON THROUGH THE WEEKEND WITH A SLIGHT CHANCE FOR STORMS EACH
PERIOD. HAVE INCREASED POPS BEGINNING ON SUNDAY AS FRONTAL SYSTEM
GETS CLOSER TO THE MID STATE AS IT DROPS DOWN INTO THE OHIO
VALLEY. THE FRONT IS STRETCHED WEST TO EAST ACROSS CENTRAL AND
SOUTHERN KENTUCKY AT 12Z MONDAY. MANUAL PROGS HAVE FRONT ALONG THE
ALABAMA BORDER BY 12Z TUESDAY. THE FRONT WILL KNOCK TEMPS DOWN
CLOSER TO THE 30-YEAR CLIMATIC NORMALS BEGINNING ON TUESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      74  99  75 100 /  20  20  20  10
CLARKSVILLE    73  98  73 100 /  20  20  20  05
CROSSVILLE     70  92  68  94 /  30  20  20  20
COLUMBIA       74  99  74  99 /  30  20  20  20
LAWRENCEBURG   72  99  73  99 /  30  20  20  20
WAVERLY        72  98  73 100 /  20  20  20  05

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

BOYD
Hazardous weather outlook, Jul 4, 5:40 AM CDT, 12 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
540 AM CDT WED JUL 4 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-051045-
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-
540 AM CDT WED JUL 4 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

THE COMBINATION OF HOT TEMPERATURES AND HUMIDITY WILL PRODUCE HEAT
INDICES OF 100 TO 105 DEGREES TODAY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

HOT TEMPERATURES AND HUMIDITY ARE EXPECTED TO PRODUCE HEAT INDICES
OF 100 TO 105 DEGREES THROUGH FRIDAY. ISOLATED STRONG TO SEVERE
THUNDERSTORMS ARE POSSIBLE INTO THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

EVEN THOUGH ANY SEVERE THUNDERSTORMS ARE EXPECTED TO BE BRIEF AND
ISOLATED, SPOTTERS ARE ENCOURAGED TO CLOSELY MONITOR WEATHER
CONDITIONS AND BE PREPARED TO CALL IN ANYTHING REACHING REPORTING
CRITERIA.

SPOTTER THUNDERSTORM REPORTING CRITERIA...
TORNADO
FUNNEL CLOUD
FLOODING
HAIL >= 1/2 INCH
WINDS > 50 MPH (MEASURED)
STRUCTURAL DAMAGE
TREES OR POWER LINES DOWN

04

In the hours before

Special weather statement, Jul 4, 5:24 PM CDT, 1 hour 14 minutes before
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Local storm report, Jul 4, 5:33 PM CDT, 1 hour 5 minutes before
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Local storm report, Jul 4, 5:34 PM CDT, 1 hour 4 minutes before
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Local storm report, Jul 4, 5:56 PM CDT, 42 minutes before
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Local storm report, Jul 4, 6:00 PM CDT, 38 minutes before
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Special weather statement, Jul 4, 6:38 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 4:23 PM CDTSpecial Weather StatementOHXRobertson22 min
Jul 4, 4:49 PM CDTSpecial Weather StatementOHXMontgomery, Robertson26 min
Jul 4, 5:13 PM CDTSpecial Weather StatementOHXCheatham, Montgomery32 min
Jul 4, 5:17 PM CDTSevere Thunderstorm WarningOHXCheatham, Dickson, Montgomery28 min
Jul 4, 5:21 PM CDTSpecial Weather StatementOHXBedford54 min
Jul 4, 5:24 PM CDTSpecial Weather StatementOHXRutherford36 min

Nearby

Special Weather Statements in Tennessee, 2012Every special weather statement in 2012

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.