Alert archive / Tennessee / Special Weather Statements in 2013

Special Weather Statement, NWS Nashville, TN

July 21, 2013Giles County, Tennessee

NWS Nashville, TN issued this special weather statement at Jul 21, 2013, 3:49 PM CDT for Giles County, Tennessee. It was in force for 26 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 21, 2013, 3:49 PM CDT (20:49 UTC)
Expired: Jul 21, 2013, 4:15 PM CDT
In force: 26 min
Issued by: NWS Nashville, TN

County Giles County, TN

The radar

The Northeast Alabama radar (KHTX), 85 km from the middle of the area, began a volume at 20:52 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, 8.8 hours before the alert went out and 103 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: 1985 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -45 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 21, 2:40 PM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, Jul 21, 2:40 PM CDT, 1 hour 9 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
240 PM CDT SUN JUL 21 2013

.DISCUSSION...A VERY MOIST AND UNSTABLE ENVIRONMENT WAS PRESENT
ACROSS MID TN TODAY WITH PW VALUES AROUND 2 INCHES AND SURFACE DEW
POINTS IN THE LOWER 70S. DAYTIME HEATING AND THE INTERACTION OF
SEVERAL OUTFLOW BOUNDARIES HAD CAUSED NUMEROUS THUNDERSTORMS TO
BLOSSOM. LOCALLY HEAVY DOWNPOURS WERE OCCURRING THANKS TO
EFFICIENT RAIN PROCESSES AND SLOW STORM MOVEMENT UNDER 10KT.
ALSO A FEW STORMS WERE PRODUCING BRIEF GUSTY WINDS... SUB-SEVERE
SO FAR.

MOIST AND MODERATELY UNSTABLE CONDITIONS WILL CONTINUE THROUGH
MONDAY. THUNDERSTORMS WILL REMAIN LIKELY AS SHORTWAVE ENERGY COMES
FROM THE CENTRAL PLAINS... ACROSS THE TN VALLEY VALLEY REGION.
NUMEROUS STORMS WILL BE RUMBLING INTO THIS EVENING...THEN THERE
MAY BE A DECREASE IN ACTIVITY AFTER SUNSET. BUT ACTIVITY IS
EXPECTED TO PICK UP AGAIN IN COVERAGE LATER IN THE NIGHT AS THE
APPROACHING SHORTWAVE BEGINS TO HAVE GREATER INFLUENCE. WIDESPREAD
SHOWERS AND STORMS WILL BE CONTINUING INTO MONDAY...WITH THE
HEAVIEST ACTIVITY OVER THE EAST HALF.

MAIN IMPACTS FROM THUNDERSTORMS THROUGH MONDAY WILL CONTINUE TO BE
LOCALLY HEAVY DOWNPOURS AND SOME GUSTY WINDS. THROUGH MONDAY YOU
CAN EXPECT SEVERAL SIGNIFICANT WX ADVISORIES AND PERHAPS 1 OR 2
BRIEF SEVERE WARNINGS. ALSO...YOU CAN EXPECT SOME FLOOD ADVISORIES
AND PERHAPS A FEW FLASH FLOOD WARNINGS. WE ARE NOT ISSUING ANY
FLOOD WATCHES AT THIS TIME SINCE WE DO NOT ANTICIPATE A WIDESPREAD
EVENT. BUT...IF HEAVY RAINFALL EVENTUALLY FOCUSES OVER PARTICULAR
AREAS...WE MAY NEED TO POST A WATCH. AREAL AVERAGE RAINFALL
THROUGH MONDAY IS EXPECTED TO BE IN THE 1 - 1.5 INCH RANGE...BUT
THE HEAVIER STORMS WILL PRODUCE SEVERAL INCHES IN SOME SPOTS.

RAIN CHANCES WILL DECREASE MONDAY NIGHT THROUGH TUESDAY
MORNING...THEN ANOTHER WAVE IN THE UNSETTLED NORTHWEST FLOW WILL
ENHANCE THUNDERSTORM CHANCES TUESDAY PM. RIGHT NOW...FORECAST
SOUNDINGS LOOK MORE UNSTABLE...SO A FEW MAY BE SEVERE.

MODELS ARE STILL IN AGREEMENT WITH NORTHWEST FLOW ALOFT CONTINUING
THROUGH THE REST OF THE FORECAST PERIOD. THE EASTERN TROUGH WILL
SHARPEN ENOUGH TO BRING A BREAK FROM THUNDERSTORMS WITH A SHOT OF
DRIER AIR THURSDAY AND FRIDAY. THE TURBULENT PATTERN RETURNS NEXT
WEEKEND WITH THUNDERSTORMS POSSIBLE AGAIN.

13

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      72  88  72  90 /  70  70  40  50
CLARKSVILLE    70  87  70  89 /  70  60  30  50
CROSSVILLE     68  80  68  83 /  70  80  50  50
COLUMBIA       72  88  72  90 /  70  70  40  50
LAWRENCEBURG   71  87  71  89 /  70  80  40  50
WAVERLY        71  88  71  90 /  70  60  30  50

&&

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

&&

Hazardous weather outlook, Jul 21, 11:14 AM CDT, 4 hours 35 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
1114 AM CDT SUN JUL 21 2013

TNZ005>011-022>034-056>066-075-077>080-093>095-221615-
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-
1114 AM CDT SUN JUL 21 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS MIDDLE
TENNESSEE THROUGH TONIGHT. A FEW STORMS COULD BE STRONG WITH WIND
GUSTS UP TO 50 MPH AND FREQUENT CLOUD TO GROUND LIGHTNING. HEAVY
RAINFALL AND LOCALIZED FLOODING ARE ALSO POSSIBLE...ESPECIALLY IN
LOW LYING AND OTHER TYPICALLY FLOOD PRONE AREAS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED AGAIN ON MONDAY
ACROSS MIDDLE TENNESSEE. A FEW STORMS COULD BE STRONG WITH WIND
GUSTS UP TO 50 MPH AND FREQUENT CLOUD TO GROUND LIGHTNING. HEAVY
RAINFALL AND LOCALIZED FLOODING ARE ALSO POSSIBLE...ESPECIALLY IN
LOW LYING AND OTHER TYPICALLY FLOOD PRONE AREAS.

55

In the hours before

Special weather statement, Jul 21, 1:47 PM CDT, 2 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
147 PM CDT SUN JUL 21 2013

TNZ007-008-026-027-211915-
CHEATHAM-DAVIDSON-ROBERTSON-SUMNER-
147 PM CDT SUN JUL 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CHEATHAM...NORTHERN
DAVIDSON...SOUTHERN ROBERTSON AND SOUTHWESTERN SUMNER COUNTIES...

AT 147 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR JOELTON...MOVING EAST AT 15 MPH.

SOME LOCATIONS IN THE PATH INCLUDE PLEASANT VIEW...BEAMAN PARK...
JOELTON...WHITES CREEK...RIDGETOP...GREENBRIER AND GOODLETTSVILLE.

FREQUENT LIGHTNING...BRIEF TORRENTIAL RAINFALL...AND WINDS OF 40 TO
45 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3649 8663 3623 8659 3621 8703 3642 8706

SHAMBURGER

Special weather statement, Jul 21, 2:12 PM CDT, 1 hour 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
212 PM CDT SUN JUL 21 2013

TNZ007-008-026-027-212000-
CHEATHAM-DAVIDSON-ROBERTSON-SUMNER-
212 PM CDT SUN JUL 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM...DAVIDSON...SOUTHERN
ROBERTSON AND SOUTHWESTERN SUMNER COUNTIES...

AT 210 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR JOELTON...MOVING EAST AT 20 MPH. ANOTHER
STRONG STORM WAS LOCATED NEAR ASHLAND CITY...MOVING EAST AT 20 MPH.

SOME LOCATIONS IN THE PATH OF THESE STORMS INCLUDE BEAMAN PARK...
WHITES CREEK...RIDGETOP...MADISON...GOODLETTSVILLE...MILLERSVILLE...
OLD HICKORY...LAKEWOOD...HENDERSONVILLE...AND NASHVILLE.

FREQUENT LIGHTNING...BRIEF TORRENTIAL RAINFALL...AND WINDS OF 40 TO
50 MPH ARE EXPECTED WITH THESE STORMS.

LAT...LON 3647 8663 3615 8658 3615 8711 3641 8701

SHAMBURGER

Special weather statement, Jul 21, 2:35 PM CDT, 1 hour 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
235 PM CDT SUN JUL 21 2013

TNZ094-212000-
LAWRENCE-
235 PM CDT SUN JUL 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR LAWRENCE COUNTY...

AT 232 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR LAWRENCEBURG...MOVING EAST AT 15 MPH.

SOME LOCATIONS IN THE PATH INCLUDE HENRYVILLE...LAWRENCEBURG AND
ETHRIDGE.

FREQUENT LIGHTNING...BRIEF TORRENTIAL RAINFALL...AND WINDS OF 40 TO
45 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3536 8751 3544 8728 3543 8724 3544 8722
      3543 8721 3531 8721 3529 8723 3529 8721
      3521 8722 3521 8721 3520 8721 3518 8747

SHAMBURGER

Special weather statement, Jul 21, 2:39 PM CDT, 1 hour 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
239 PM CDT SUN JUL 21 2013

TNZ063-064-078-212015-
CANNON-DE KALB-WARREN-
239 PM CDT SUN JUL 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR CANNON...SOUTHERN DE KALB AND
NORTHERN WARREN COUNTIES...

AT 237 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM 7 MILES EAST OF WOODBURY...MOVING EAST AT 15
MPH.

SOME LOCATIONS IN THE PATH INCLUDE SMITHVILLE AND GREEN HILL.

FREQUENT LIGHTNING...BRIEF TORRENTIAL RAINFALL...AND WINDS OF 40 TO
45 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3576 8567 3575 8605 3593 8607 3599 8570

SHAMBURGER

Local storm report, Jul 21, 3:48 PM CDT, 1 minute before

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Special weather statement, Jul 21, 3:49 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 20, 7:48 PM CDT	Special Weather Statement	OHX	Trousdale	42 min
Jul 20, 8:13 PM CDT	Special Weather Statement	OHX	Williamson	47 min
Jul 20, 8:17 PM CDT	Special Weather Statement	OHX	Macon	43 min
Jul 20, 8:25 PM CDT	Special Weather Statement	OHX	Davidson	50 min
Jul 20, 8:51 PM CDT	Special Weather Statement	OHX	Williamson	39 min
Jul 20, 9:01 PM CDT	Areal Flood Advisory	OHX	Davidson	3 hr
Jul 20, 9:13 PM CDT	Special Weather Statement	OHX	Sumner	47 min
Jul 20, 9:21 PM CDT	Flash Flood Warning	OHX	Davidson, Sumner, Wilson	3 hr
Jul 20, 9:34 PM CDT	Special Weather Statement	OHX	Wilson	41 min
Jul 20, 10:12 PM CDT	Special Weather Statement	OHX	Smith	48 min
Jul 21, 10:09 AM CDT	Areal Flood Advisory	OHX	Pickett	2 hr
Jul 21, 12:10 PM CDT	Special Weather Statement	OHX	Hickman	35 min
Jul 21, 12:53 PM CDT	Special Weather Statement	OHX	Putnam	37 min
Jul 21, 1:07 PM CDT	Special Weather Statement	OHX	Dickson	38 min
Jul 21, 1:18 PM CDT	Special Weather Statement	OHX	Marshall	27 min
Jul 21, 1:35 PM CDT	Special Weather Statement	OHX	Cheatham	25 min
Jul 21, 1:47 PM CDT	Special Weather Statement	OHX	Robertson	28 min
Jul 21, 2:12 PM CDT	Special Weather Statement	OHX	Davidson	48 min
Jul 21, 2:35 PM CDT	Special Weather Statement	OHX	Lawrence	25 min
Jul 21, 2:39 PM CDT	Special Weather Statement	OHX	DeKalb	36 min
Jul 21, 2:56 PM CDT	Areal Flood Advisory	OHX	Lawrence	2 hr
Jul 21, 3:36 PM CDT	Flash Flood Warning	OHX	Lawrence	3 hr
Jul 21, 5:14 PM CDT	Areal Flood Advisory	OHX	Montgomery, Stewart	2 hr

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.