Alert archive / Tennessee / Special Weather Statements in 2014

Special Weather Statement, NWS Nashville, TN

August 23, 2014Cheatham County, Tennessee

NWS Nashville, TN issued this special weather statement at Aug 23, 2014, 3:14 PM CDT for Cheatham County, Tennessee. It was in force for 46 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 23, 2014, 3:14 PM CDT (20:14 UTC)
Expired: Aug 23, 2014, 4:00 PM CDT
In force: 46 min
Issued by: NWS Nashville, TN

County Cheatham County, TN

The radar

The Ft Campbell radar (KHPX), 42 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 52 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: 204 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1079 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 8 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 23, 3:03 PM CDT, 11 minutes earlier.

Area forecast discussion, Aug 23, 3:03 PM CDT, 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
303 PM CDT SAT AUG 23 2014

.DISCUSSION...
EXTENSIVE CLOUDS THIS MORNING GAVE WAY TO PCLOUDY/MSUNNY SKIES
THIS AFTERNOON ALONG WITH ISOLATED SHOWERS/STORMS. SFC DEWPOINTS
ARE A COUPLE DEGREES HIGHER THAN 24 HOURS AGO...AND WITH AIR TEMPS
MAINLY IN THE 90S...HEAT INDEX VALUES SO FAR THIS AFTERNOON HAVE
BEEN IN THE 99 TO 105 RANGE ACROSS ALL OF MIDDLE TN EXCEPT FOR
THE EAST THIRD/PLATEAU.

SHORT WAVE THAT HELPED TRIGGER MCS LAST NIGHT OVER THE NORTHERN
PLAINS WAS STILL GOING STRONG THIS AFTERNOON AS IT CRESTED THE H5
RIDGE AXIS THAT EXISTS ALONG THE MS RIVER VALLEY. WILL KEEP CHC
POPS IN FORECAST FOR MOST AREAS ALL NIGHT TONIGHT TO ACCOUNT FOR
LEFTOVER EVENING CONVECTION PLUS POTENTIAL FOR MCS REMNANTS TO
APPROACH FROM THE NORTH. WITH H5 RIDGE AXIS TO OUR WEST...STORMS
IN OUR AREA WILL MOVE TO THE SOUTH AT 10 TO 15 MPH.

H5 PATTERN WILL NOT CHANGE TOO MUCH SUNDAY OR MONDAY AS RIDGE AXIS
REMAINS TO OUR WEST WITH LIGHT NORTHERLY FLOW ALOFT. THIS
FLOW...COMBINED WITH VERY RICH MOISTURE AND STRONG INSOLATION
SHOULD RESULT IN TWO MORE DAYS LIKE TODAY...IE...HOT/HUMID WITH
20 TO 30 PERCENT POPS. TEMPS AND HUMIDITY WILL STAY HIGH ENOUGH
ON SUNDAY FOR CONTINUED BORDERLINE HEAT ADVISORY SO WILL EXTEND
THE ADVY UNTIL 02Z MONDAY. TEMPS SHOULD EDGE SLIGHTLY LOWER ON
MONDAY SO NO NEED TO EXTEND THE ADVY THAT FAR.

EXPECT SUBTLE CHANGES IN THE H5 PATTERN BY MIDWEEK AS RIDGE AXIS
BECOMES ORIENTED ALONG THE OH VALLEY RATHER THAN THE MS VALLEY.
THIS WILL SHUT OFF THE NORTHERLY MID LEVEL FLOW OVER MID TN AND
REDUCE OUR RAIN CHANCES FOR TUESDAY AND WEDNESDAY. TEMPS AND
DEWPOINTS SHOULD BE SLIGHTLY LOWER THAN CURRENT NUMBERS...BUT IT
WILL STILL BE HOT AND HUMID.

BOTH EXTENDED MODELS SHOW POTENTIAL FOR H5 WEAK TROF TO MOVE FROM
THE WESTERN U.S. TOWARD THE EASTERN U.S. DURING THE LATTER PART OF
NEXT WEEK. THIS SHOULD ALLOW TEMPS TO GRADUALLY LOWER TO NEAR
AVERAGE LEVELS FOR LATE AUGUST WHILE ALSO PROVIDING A SLIGHT
CHANCE FOR AFTERNOON/EVENING STORMS.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      75  95  73  92 /  30  30  30  30
CLARKSVILLE    73  95  71  93 /  30  30  20  30
CROSSVILLE     71  88  68  84 /  40  40  40  30
COLUMBIA       72  96  73  93 /  30  30  30  30
LAWRENCEBURG   72  96  72  92 /  20  30  20  30
WAVERLY        73  96  72  94 /  20  30  20  30

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
HEAT ADVISORY UNTIL 9 PM CDT SUNDAY FOR TNZ005>009-023>030-
056>064-075-077-093>095.

&&

49

Hazardous weather outlook, Aug 23, 5:40 AM CDT, 9 hours 34 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
540 AM CDT SAT AUG 23 2014

TNZ005>009-023>030-056>064-075-077-093>095-241045-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-HOUSTON-HUMPHREYS-
DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-SMITH-PERRY-HICKMAN-
LEWIS-WILLIAMSON-MAURY-MARSHALL-RUTHERFORD-CANNON-DE KALB-BEDFORD-
COFFEE-WAYNE-LAWRENCE-GILES-
540 AM CDT SAT AUG 23 2014

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 9 PM CDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT.

HEAT AND HUMIDITY WILL PUSH HEAT INDICES UP INTO THE 100 TO 105
RANGE THIS AFTERNOON.

MORE INFORMATION IS AVAILABLE ON THE INTERNET AT WEATHER.GOV OR
BY LISTENING TO NOAA WEATHER RADIO.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

TNZ010-011-031>034-065-066-078>080-241045-
CLAY-PICKETT-JACKSON-PUTNAM-OVERTON-FENTRESS-WHITE-CUMBERLAND-
WARREN-GRUNDY-VAN BUREN-
540 AM CDT SAT AUG 23 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT.

A FEW STORMS THUNDERSTORMS ARE POSSIBLE TODAY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

07

In the hours before

Special weather statement, Aug 23, 3:14 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
314 PM CDT SAT AUG 23 2014

TNZ007-026-232100-
CHEATHAM-ROBERTSON-
314 PM CDT SAT AUG 23 2014

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM AND ROBERTSON
COUNTIES...

AT 314 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM 10 MILES NORTH OF ASHLAND CITY...MOVING
SOUTHEAST AT 10 MPH.

SOME LOCATIONS IN THE PATH INCLUDE PLEASANT VIEW.

WINDS OF 40 TO 50 MPH...SMALL HAIL...BRIEF HEAVY DOWNPOURS...ALONG
WITH NUMEROUS CLOUD TO GROUND LIGHTNING STRIKES ARE POSSIBLE WITH
THIS STORM.

LAT...LON 3637 8692 3631 8701 3637 8726 3642 8717
      3642 8716 3643 8715 3648 8704

31

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 5:23 AM CDT	Heat Advisory	OHX	Bedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 21 more	40 hr
Aug 23, 3:24 PM CDT	Special Weather Statement	OHX	Houston, Humphreys, Stewart	36 min
Aug 23, 3:35 PM CDT	Special Weather Statement	OHX	Dickson	40 min
Aug 23, 3:38 PM CDT	Special Weather Statement	OHX	Robertson	37 min
Aug 23, 4:06 PM CDT	Special Weather Statement	OHX	Sumner	39 min
Aug 23, 4:10 PM CDT	Severe Thunderstorm Warning	OHX	Robertson, Sumner	35 min
Aug 23, 4:16 PM CDT	Severe Thunderstorm Warning	OHX	Robertson, Sumner	44 min
Aug 23, 4:27 PM CDT	Special Weather Statement	OHX	Hickman	33 min
Aug 23, 4:31 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner	29 min
Aug 23, 4:33 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Humphreys	27 min
Aug 23, 4:39 PM CDT	Special Weather Statement	OHX	Dickson, Williamson	21 min
Aug 23, 4:45 PM CDT	Severe Thunderstorm Warning	OHX	Robertson, Sumner	45 min
Aug 23, 5:03 PM CDT	Special Weather Statement	OHX	Hickman, Perry, Williamson	42 min
Aug 23, 5:14 PM CDT	Special Weather Statement	OHX	Wilson	31 min
Aug 23, 5:37 PM CDT	Special Weather Statement	OHX	Hickman, Lewis, Maury, Perry, Rutherford	38 min
Aug 23, 5:51 PM CDT	Special Weather Statement	OHX	Cannon, Rutherford, Wilson	39 min

Nearby

Special Weather Statements in Tennessee, 2014 Every special weather statement in 2014

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.