Alert archive / Tennessee / Special Weather Statements in 2013

Special Weather Statement, NWS Nashville, TN

August 7, 2013Humphreys County, Tennessee

NWS Nashville, TN issued this special weather statement at Aug 7, 2013, 9:20 AM CDT for Humphreys County, Tennessee. It was in force for 25 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 7, 2013, 9:20 AM CDT (14:20 UTC)
Expired: Aug 7, 2013, 9:45 AM CDT
In force: 25 min
Issued by: NWS Nashville, TN

County Humphreys County, TN

The radar

The Ft Campbell radar (KHPX), 100 km from the middle of the area, began a volume at 14:21 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, 2.3 hours before the alert went out and 110 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: 995 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 98 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 Aug 7, 3:49 AM CDT, 5 hours 31 minutes earlier.

Area forecast discussion, Aug 7, 3:49 AM CDT, 5 hours 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
349 AM CDT WED AUG 7 2013

.DISCUSSION...
COMPLEX AND UNSEASONLIKE PATTERN CONTINUES TO LINGER OVER THE MID-
SOUTH. FRONTAL BOUNDARY TO THE SOUTH CURRENTLY LIFTING NORTH AND
WEAKENING...AND LOOKS TO BE ACROSS SOUTHERN KY 12-18Z TODAY
BEFORE WASHING OUT. SECONDARY FRONTAL BOUNDARY DROPPING OUT OF THE
GREAT LAKES EXPECTED TO SAG DOWN TOWARD THE MS RIVER VALLEY LATE
TODAY WITH PUSH OF NORTHWEST ML/UL FLOW...EVENTUALLY MERGING WITH
OK/TX SFC LOW. MOISTURE/INSTABILITY REMAINS PLENTY SUFFICIENT WITH
DECAYING BOUNDARY PASSING THIS MORNING AND SECOND APPROACHING
FRONT LATE TODAY FOR SCT-NUM SHOWERS/STORMS TREND TO CONTINUE.
FRONT SETS UP NEAR NORTHERN KY BORDER TONIGHT THEN BECOMES QUASI-
STATIONARY INTO THE WEEKEND AS SFC WAVE RIDES SLOWLY ALONG IT AND
PASSES JUST NORTH OF THE MID-STATE LATE SATURDAY. EVEN THOUGH SOME
DRYING OCCURS ALOFT FRIDAY...MOISTURE AT OR BELOW H85 REMAINS HEALTHY.
BY THE END OF THE WEEKEND HOWEVER...SFC WAVE MOVES TO THE ATLANTIC
SEABOARD AND HIGH PRES MOVING INTO THE OH VALLEY HELPS PUSH FRONT
DOWN TO THE TN/AL BORDER WHERE IT MEANDERS INTO MID-WEEK BEFORE
MOVING FURTHER SOUTH AS ML/UL TROUGHS DEEPEN SOME.

OVERALL PATTERN WILL KEEP INGREDIENTS IN THE IMMEDIATE VICINITY
FOR PCPN CHANCES NEXT 7 DAYS. EXPECT CHANCE FOR PCPN TO REMAIN
FAIRLY HIGH THROUGH SUNDAY WHILE ON SOUTH SIDE OF BOUNDARY...BUT
CHANCES SHOULD DROP SIGNIFICANTLY EARLY NEXT WEEK AS FRONT
TRANSITIONS FURTHER SOUTH INTO AL.

BEST CHANCE FOR SEVERE STORMS REMAINS IN CLOSE PROXIMITY TO SFC
LOW/BOUNDARY TODAY/THURSDAY...WHICH IS NORTH/WEST OF THE CWA.
WHEN FRONT PASSES ON SUNDAY...MOISTURE AT THAT POINT GOOD BIT
MORE SHALLOW. THUS NEXT FEW DAYS...SEVERE THREAT SEEMINGLY MINIMAL.
ISOLATED FLOODING HOWEVER VERY POSSIBLE THROUGH FRIDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      87  74  88  73 /  60  50  60  30
CLARKSVILLE    84  72  88  71 /  60  50  60  40
CROSSVILLE     80  69  83  69 /  70  50  60  30
COLUMBIA       86  73  87  73 /  60  50  60  30
LAWRENCEBURG   86  72  87  72 /  60  50  60  20
WAVERLY        84  73  86  72 /  60  50  60  30

&&

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

Hazardous weather outlook, Aug 7, 5:38 AM CDT, 3 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
538 AM CDT WED AUG 7 2013

TNZ005>011-022>034-056>066-075-077>080-093>095-081030-
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-
538 AM CDT WED AUG 7 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

SCATTERED TO NUMEROUS THUNDERSTORMS ARE LIKELY TODAY AND TONIGHT.
STORMS COULD BECOME STRONG AT TIMES LOCALLY...PRODUCING GUSTY
WIND AND FREQUENT LIGHTNING. STRONGER STORMS MAY ALSO PRODUCE
MINOR STREET FLOODING AS WELL AS RISES ON CREEKS AND SMALL STREAMS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

07

In the hours before

Special weather statement, Aug 7, 8:27 AM CDT, 53 minutes before

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Special weather statement, Aug 7, 9:10 AM CDT, 10 minutes before

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Special weather statement, Aug 7, 9:20 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
920 AM CDT WED AUG 7 2013

TNZ024-071445-
HUMPHREYS-
920 AM CDT WED AUG 7 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN HUMPHREYS COUNTY...

AT 914 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR NEW JOHNSONVILLE...MOVING EAST AT 20 MPH.

SOME LOCATIONS IN THE PATH INCLUDE NEW JOHNSONVILLE AND HURRICANE
MILLS.

FREQUENT LIGHTNING...GUSTY WINDS OF 35 TO 45 MPH...AND BRIEF
TORRENTIAL RAINFALL ARE EXPECTED WITH THIS STORM.

LAT...LON 3603 8800 3607 8796 3605 8754 3597 8753
      3595 8756 3595 8760 3593 8763 3591 8770
      3584 8772 3584 8782 3580 8785 3584 8795
      3594 8793 3594 8800 3598 8800

SHAMBURGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 8:27 AM CDT	Special Weather Statement	OHX	Dickson	48 min
Aug 7, 9:10 AM CDT	Special Weather Statement	OHX	Cheatham, Dickson	50 min
Aug 7, 9:31 AM CDT	Areal Flood Advisory	OHX	Dickson, Montgomery	119 min
Aug 7, 9:42 AM CDT	Special Weather Statement	OHX	Hickman	48 min
Aug 7, 10:14 AM CDT	Special Weather Statement	OHX	Williamson	46 min
Aug 7, 11:06 AM CDT	Special Weather Statement	OHX	Rutherford	39 min
Aug 7, 11:25 AM CDT	Special Weather Statement	OHX	Bedford	50 min
Aug 7, 12:33 PM CDT	Special Weather Statement	OHX	Lawrence	42 min
Aug 7, 1:05 PM CDT	Special Weather Statement	OHX	Giles, Lawrence	40 min
Aug 7, 1:14 PM CDT	Areal Flood Advisory	OHX	Giles, Lawrence, Marshall	2 hr
Aug 7, 1:40 PM CDT	Special Weather Statement	OHX	Lawrence	65 min
Aug 7, 2:52 PM CDT	Special Weather Statement	OHX	Lawrence	38 min

Nearby

Special Weather Statements in Tennessee, 2013 Every special weather statement in 2013

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.