Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

July 2, 2012Davidson County, Robertson County, Tennessee

NWS Nashville, TN issued this special weather statement at Jul 2, 2012, 2:37 PM CDT for Davidson County, Robertson County, Tennessee. It was in force for 23 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 2, 2012, 2:37 PM CDT (19:37 UTC)
Expired: Jul 2, 2012, 3:00 PM CDT
In force: 23 min
Issued by: NWS Nashville, TN

Counties Davidson County, TN, Robertson County, TN

The radar

The Nashville radar (KOHX), 31 km from the middle of the area, began a volume at 19:40 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, 7.6 hours before the alert went out and 38 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: 695 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1702 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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 2, 12:47 PM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Jul 2, 12:47 PM CDT, 1 hour 50 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
1247 PM CDT MON JUL 2 2012

.UPDATE...

18Z TAF DISCUSSION.

&&

.AVIATION...

VFR. CUMULUS CONTINUES TO FORM THROUGHOUT MIDDLE TENNESSEE THIS
AFTERNOON...WITH SOME ISOLATED TO WIDELY SCATTERED THUNDERSTORMS
CONTINUE TO DEVELOP ALONG TWO REMNANT OUTFLOW BOUNDARIES...ONE
STRETCHING FROM WAYNESBORO TO SPRINGFIELD...AND NOTHER FROM
SPRINGFIELD TO NEAR CROSSVILLE. WILL MENTION VCTS AT ALL AIRPORTS
THROUGH 02Z. SCATTERED CIRRUS ANTICIPATED OVERNIGHT. LIGHT
SOUTHWEST WINDS EXPECTED THROUGH THE TAF PERIOD...BUT ERRATIC
DIRECTIONS/SPEEDS POSSIBLE NEAR ANY CONVECTION.

&&

.PREV DISCUSSION... /ISSUED 817 AM CDT MON JUL 2 2012/

UPDATE...

ISOLATED TO WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ARE
INCREASING IN COVERAGE THIS MORNING ACROSS SOUTHERN AND
NORTHEASTERN ZONES...BOTH IN ASSOCIATION WITH REMNANT OUTFLOW
BOUNDARIES FROM YESTERDAYS AND LAST NIGHTS CONVECTION. WILL RAISE
POPS ACROSS EASTERN AND SOUTHERN ZONES...AND REMOVE AFTERNOON
WORDING TO EXTEND POPS THROUGH THE ENTIRE DAY FOR ALL AREAS. NO
OTHER CHANGES ATTM.

PREV DISCUSSION... /ISSUED 544 AM CDT MON JUL 2 2012/

UPDATE...ADDED AVIATION SECTION FOR 12Z TAF'S.

AVIATION...BNA/CKV/CSV...EXPECT A FEW MORE CLOUDS TODAY AS
MOISTURE CONTINUES TO SLOWLY INCREASE. ISOLATED STORMS ARE
POSSIBLE DURING THE AFTERNOON AND EARLY EVENING, AND WILL HANDLE
THESE WITH "VCTS" REMARKS FOR NOW GIVEN THE LOW POP'S. OTHERWISE,
IT LOOKS LIKE VFR WX THE NEXT 24 HRS.

PREV DISCUSSION... /ISSUED 315 AM CDT MON JUL 2 2012/

DISCUSSION...UPPER RIDGE HAS SLOWLY BEEN WEAKENING OVER THE PAST
FEW DAYS AS UPPER FLOW BEGINS TO TURN NWLY/WLY. PROGS SHOW THE
UPPER RIDGE...CENTERED OVER GA...SINKING FURTHER SOUTHEAST AS WLY
FLOW TAKES OVER THE AREA. ALSO...BOTH THE ECM AND THE GFS SHOW A
WEAK SHORTWAVE APPROACHING THE AREA TODAY AND TRANSITING THE AREA
ON TUE. THIS WILL INSURE INCREASED TSTM ACTIVITY.

AFTER THIS SHORTWAVE PASSES FLOW TURNS TO NLY OVER THE AREA. THIS
WILL BRING A COUPLE OF WEAK FRONTS INTO THE AREA...FIRST ON THU
AND THE 2ND LATE ON SUN. ALL OF THIS WILL HELP TO KEEP TEMPS OUT
OF THE TRIPLE DIGIT RANGE BUT STILL SEVERAL DEGREES ABOVE NORMAL.
BY THE BY...DESPITE HAVING A VERY HOT END TO THE MONTH OF JUNE...
JUNE 1952 IS STILL THE WARMEST JUNE ON RECORD FOR NASHVILLE BY A
LONG SHOT. HOWEVER...THE LAST 4 DAYS JUN 28 - JUL 1 ARE THE HOTTEST 4
DAYS IN 142 YEARS OF RECORDED WEATHER AT NASHVILLE.

SO THE BOTTOM LINE WILL BE...SEVERAL DEGREES WARMER THAN NORMAL
AND INCREASED CHANCES OF RAIN...MAINLY IN THE AFTERNOON AND
EVENING. I'VE GOT A 20-30 PCT CHANCE OF RAIN EACH DAY. WHILE THIS
RAIN WILL HELP THE DROUGHT SITUATION A LITTLE BIT...I WOULD NOT
EXPECT ANY SIGNIFICANT DROUGHT RELIEF. WHAT WE WOULD NEED IS A
LONG PERIOD OF SOAKING RAINFALL. GIVEN THAT IT SUMMER...THAT IS
NOT LIKELY TO HAPPEN...UNLESS THE REMAINS OF A TROPICAL STORM MOVE
INTO THE AREA AND LINGERS SEVERAL DAYS. WHILE THAT IS POSSIBLE...THE
ODDS OF IT HAPPENING ARE REMOTE.

&&

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

SHAMBURGER

Hazardous weather outlook, Jul 2, 5:00 AM CDT, 9 hours 37 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
500 AM CDT MON JUL 2 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-031030-
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-
500 AM CDT MON JUL 2 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

ROSE

In the hours before

Special weather statement, Jul 2, 12:46 PM CDT, 1 hour 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1246 PM CDT MON JUL 2 2012

TNZ057-059-060-021830-
HICKMAN-MAURY-WILLIAMSON-
1246 PM CDT MON JUL 2 2012

...SIGNIFICANT WEATHER ADVISORY FOR HICKMAN...MAURY AND WILLIAMSON
COUNTIES...

AT 1240 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 11 MILES EAST OF CENTERVILLE...MOVING NORTHEAST
AT 10 MPH.

HALF INCH SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3604 8706 3599 8704 3602 8699 3588 8677
      3570 8727 3587 8740 3597 8726 3596 8721
      3598 8719 3601 8719 3605 8714

BOYD

Special weather statement, Jul 2, 2:10 PM CDT, 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
210 PM CDT MON JUL 2 2012

TNZ025-026-021945-
CHEATHAM-DICKSON-
210 PM CDT MON JUL 2 2012

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

AT 207 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR WHITE BLUFF...OR 11 MILES NORTHEAST OF
DICKSON...MOVING EAST AT 15 MPH.

HALF INCH SIZE HAIL...HEAVY RAINFALL AND WINDS 40 TO 45 MPH ARE
EXPECTED WITH THIS STORM.

LAT...LON 3611 8702 3609 8704 3606 8726 3623 8735
      3631 8709

AL

Special weather statement, Jul 2, 2:37 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
237 PM CDT MON JUL 2 2012

TNZ007-027-022000-
DAVIDSON-ROBERTSON-
237 PM CDT MON JUL 2 2012

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

AT 230 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A FEW THUNDERSTORMS ALONG A LINE EXTENDING FROM THE STATE LINE SOUTH
TO NEAR NASHVILLE...SLOWLY DRIFTING NORTHEAST AT 10 MPH.

THESE STORMS WILL BE NEAR...
  NASHVILLE BY 240 PM CDT.
  GREENBRIER BY 300 PM CDT.

SMALL HAIL...AND WINDS 40 TO 45 MPH ARE EXPECTED WITH THESE STORMS.

LAT...LON 3658 8675 3641 8669 3642 8675 3634 8672
      3630 8666 3618 8661 3615 8695 3625 8698
      3637 8691 3639 8692 3637 8699 3640 8703
      3645 8704 3665 8700 3665 8673

AL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 11:12 PM CDT	Special Weather Statement	OHX	Cumberland	48 min
Jul 2, 12:46 PM CDT	Special Weather Statement	OHX	Williamson	44 min
Jul 2, 12:52 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury, Williamson	38 min
Jul 2, 1:23 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	26 min
Jul 2, 2:10 PM CDT	Special Weather Statement	OHX	Cheatham	35 min
Jul 2, 3:07 PM CDT	Special Weather Statement	OHX	Wilson	23 min
Jul 2, 3:10 PM CDT	Special Weather Statement	OHX	Robertson	35 min
Jul 2, 3:29 PM CDT	Special Weather Statement	OHX	Maury	61 min
Jul 2, 3:32 PM CDT	Special Weather Statement	OHX	Hickman	43 min
Jul 2, 4:37 PM CDT	Special Weather Statement	OHX	Marshall	53 min
Jul 2, 4:58 PM CDT	Special Weather Statement	OHX	Clay, Overton	47 min
Jul 2, 5:14 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Overton	46 min
Jul 2, 5:36 PM CDT	Special Weather Statement	OHX	Cumberland, Jackson, Overton, Putnam, White	54 min
Jul 2, 5:42 PM CDT	Special Weather Statement	OHX	Grundy, Van Buren, Warren	63 min
Jul 2, 6:39 PM CDT	Special Weather Statement	OHX	Cumberland, White	36 min

Nearby

Special Weather Statements in Tennessee, 2012 Every 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.