Alert archive / Tennessee / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 101, NWS Nashville, TN

May 14, 20105 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at May 14, 2010, 1:42 PM CDT for 5 counties in Tennessee. It was in force for 48 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 14, 2010, 1:42 PM CDT (18:42 UTC)
Expired: May 14, 2010, 2:30 PM CDT
In force: 48 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Clay County, TN, Jackson County, TN, Macon County, TN, Smith County, TN, Trousdale County, TN

The radar

The Nashville radar (KOHX), 89 km from the middle of the area, began a volume at 18:45 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.

What was reported inside it

Time	Report	Where	Remark
May 14, 2:30 PM CDT	HAIL 1.5	Gainesboro, TN	TRAINED SPOTTER REPORTED PING PONG BALL SIZE HAIL IN GAINESBORO.
May 14, 2:36 PM CDT	HAIL 0.75	Gainesboro, TN	DIME SIZE HAIL REPORTED BY A SPOTTER IN GAINESBORO.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 48 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 14, 11:34 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.7 hours before the alert went out and 96 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: 2636 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 831 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

613 
WUUS54 KOHX 141842
SVROHX
TNC027-087-111-159-169-141930-
/O.NEW.KOHX.SV.W.0101.100514T1842Z-100514T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
142 PM CDT FRI MAY 14 2010

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN SMITH COUNTY IN MIDDLE TENNESSEE...
  EASTERN TROUSDALE COUNTY IN MIDDLE TENNESSEE...
  JACKSON COUNTY IN MIDDLE TENNESSEE...
  CLAY COUNTY IN MIDDLE TENNESSEE...
  MACON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 230 PM CDT

* AT 140 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED 6 MILES SOUTH OF
  LAFAYETTE...AND MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RED BOILING SPRINGS BY 155 PM CDT...
  9 MILES NORTH OF GAINESBORO BY 205 PM CDT...
  CELINA BY 220 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM CDT FRIDAY
EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3662 8544 3650 8543 3647 8547 3644 8549
      3628 8549 3627 8551 3626 8608 3662 8611
TIME...MOT...LOC 1842Z 260DEG 38KT 3644 8600

$$

07

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 14, 1:24 PM CDT, 18 minutes earlier.

Area forecast discussion, May 14, 1:24 PM CDT, 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
124 PM CDT FRI MAY 14 2010

.UPDATE...
SCT TO BROKEN SLOW MOVING THUNDERSTORMS COVERING MUCH OF THE
NORTHWESTERN HALF OF THE MID STATE. GIVEN THE PREVIOUS HEAVY
RAINFALL EVENT...WILL GO AHEAD AND ISSUE A FLASH FLOOD WATCH FOR
ROUGHLY THE NORTHWESTERN TWO THIRDS OF THE MID STATE. WILL ALSO
BUMP POPS UPWARD INTO THE CATEGORICAL RANGE FOR THE FLASH FLOOD
WATCH AREA. UPDATE JUST SENT.

&&

.PREV DISCUSSION... /ISSUED 1151 AM CDT FRI MAY 14 2010/

UPDATE...
REISSUED ZONES AS A SVR TSTM WATCH IS NOW IN EFFECT UNTIL 7 PM
CDT. I ALSO INCREASE HIGH TEMPS MAINLY EASTERN HALF...AHEAD OF
DEVELOPING CONVECTION. STILL VERY UNSTABLE. ISOL/SCT SEVERE
DEVELOPMENT EXPECTED TO CONTINUE THIS AFTERNOON. LARGE HAIL AND
STRAIGHT LINE WIND DAMAGE IS THE PREVAILING THREAT.

PREV DISCUSSION... /ISSUED 940 AM CDT FRI MAY 14 2010/

MESOSCALE UPDATE...MORNING SOUNDING FROM OHX SHOWS A HIGHLY
UNSTABLE ENVIRONMENT IN PLACE AHEAD OF A COLD FRONT SLOWLY MOVING
INTO THE MID STATE. LIFTED INDEX IS -9.6, WITH A CAPE OF 3343
K/KG. K-INDEX IS THROUGH THE ROOF AT 44, TOTALS INDEX IS 59, AND
SWEAT INDEX IS 438. THESE ARE ALL REMARKABLY HIGH INDICATORS.

THE ONE INHIBITOR IN PLACE IS AN INVERSION JUST ABOVE 700 MB.
HOWEVER, WE'RE WARM ENOUGH ALREADY AT THE SURFACE TO BUST
THROUGH THE CAP. COMBINE THIS WITH THE ADDITIONAL LIFT PROVIDED BY
THE FRONT, AND SEVERE STORMS REMAIN POSSIBLE ACROSS THE MID STATE.
THE SPC DOES HAVE ALL OF MIDDLE TENNESSEE UNDER A SLIGHT RISK
TODAY, SO THE SITUATION DOES WARRANT MONITORING, ESPECIALLY AS
SURFACE TEMPERATURES CONTINUE TO WARM.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL 7 PM CDT THIS EVENING FOR TNZ005>011-
022>034-056>060-062-064-093.

&&

21

Hazardous weather outlook, May 14, 5:36 AM CDT, 8 hours 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
536 AM CDT FRI MAY 14 2010

TNZ005>011-022>034-056>066-075-077>080-093>095-151045-
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-
536 AM CDT FRI MAY 14 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT WILL PUSH ACROSS THE MID STATE TODAY AND PRODUCE THE
LIKELIHOOD FOR THUNDERSTORMS...A FEW OF WHICH COULD BECOME SEVERE...
WITH DAMAGING WIND GUSTS...LARGE HAIL...AND HEAVY DOWNPOURS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY
THE COLD FRONT THAT PASSES THROUGH TODAY...WILL BECOME STATIONARY NEAR
THE ALABAMA BORDER ON SATURDAY...THEN BEGIN MOVING NORTH AS A WARM
FRONT BY SUNDAY. ISOLATED SEVERE THUNDERSTORMS WILL REMAIN
POSSIBLE ON SATURDAY...WITH DAMAGING WIND GUSTS...LARGE HAIL...AND
HEAVY DOWNPOURS.

IN ADDITION TO THE SEVERE WEATHER POSSIBLE ON SATURDAY...MIDDLE
TENNESSEE IS EXPECTED TO RECEIVE BETWEEN TWO AND THREE INCHES OF
RAINFALL THIS WEEKEND AND INTO MONDAY...WITH LOCALLY HIGHER AMOUNTS
POSSIBLE. FLOOD PROBLEMS MAY DEVELOP AS THE WEEKEND PROGRESSES...
ESPECIALLY IN AREAS WHERE HEAVY THUNDERSTORM RAINS REPEATEDLY
OCCUR.

.SPOTTER INFORMATION STATEMENT...SPOTTERS ARE ENCOURAGED TO RELAY
REPORTS OF SEVERE WEATHER AND FLOODING TO THE NATIONAL WEATHER
SERVICE.

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

19

In the hours before

Local storm report, May 14, 11:33 AM CDT, 2 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1133 AM CDT FRI MAY 14 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1130 AM     HAIL             4 SE CLARKSVILLE        36.52N 87.30W
05/14/2010  E1.50 INCH       MONTGOMERY         TN   TRAINED SPOTTER

            SPOTTER REPORTED 1 1/2 INCH HAIL JUST SE OF CLARKSVILLE.

&&

JLM

Local storm report, May 14, 11:59 AM CDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1159 AM CDT FRI MAY 14 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1135 AM     HAIL             7 ESE CLARKSVILLE       36.52N 87.23W
05/14/2010  E2.00 INCH       MONTGOMERY         TN   PUBLIC

            PUBLIC REPORTED EGG SIZE HAIL AT THE WALMART IN SANGO.

&&

JLM

Local storm report, May 14, 1:16 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
116 PM CDT FRI MAY 14 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0112 PM     HAIL             2 NW HARTSVILLE         36.41N 86.18W
05/14/2010  E1.00 INCH       TROUSDALE          TN   NWS EMPLOYEE

            RETIRED NWS EMPLOYEE REPORTED QUARTER SIZE HAIL IN
            TROUSDALE COUNTY.

&&

RLH

Local storm report, May 14, 1:41 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
141 PM CDT FRI MAY 14 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0140 PM     HAIL             GALLATIN                36.38N 86.45W
05/14/2010  E1.00 INCH       SUMNER             TN   NWS EMPLOYEE

            FORMER NWS EMPLOYEE REPORTED QUARTER SIZE HAIL IN
            GALLATIN.

&&

RLH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 6:17 AM CDT	Severe Thunderstorm Warning	OHX	Stewart	43 min
May 14, 10:50 AM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	25 min
May 14, 11:12 AM CDT	Severe Thunderstorm Warning	OHX	Montgomery	33 min
May 14, 11:36 AM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	24 min
May 14, 11:47 AM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	28 min
May 14, 11:58 AM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	32 min
May 14, 12:14 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner, Wilson	61 min
May 14, 12:16 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	44 min
May 14, 12:31 PM CDT	Severe Thunderstorm Warning	OHX	Robertson, Sumner	44 min
May 14, 12:40 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Humphreys, Perry	35 min
May 14, 12:42 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Montgomery	33 min
May 14, 12:56 PM CDT	Flash Flood Warning	OHX	Montgomery, Robertson	3 hr
May 14, 1:00 PM CDT	Flash Flood Warning	OHX	Davidson	3 hr
May 14, 1:07 PM CDT	Severe Thunderstorm Warning	OHX	Jackson, Macon, Smith, Sumner, Trousdale, Wilson	38 min
May 14, 1:09 PM CDT	Flash Flood Watch	OHX	Benton, Cheatham, Clay, Davidson, DeKalb, Dickson and 22 more	6 hr
May 14, 1:13 PM CDT	Flash Flood Warning	OHX	Perry	3 hr
May 14, 1:18 PM CDT	Flash Flood Warning	OHX	Davidson, Sumner	3 hr
May 14, 1:18 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner, Wilson	42 min
May 14, 1:20 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Perry	40 min
May 14, 1:30 PM CDT	Flash Flood Warning	OHX	Macon, Trousdale	3 hr
May 14, 1:58 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner, Wilson	47 min
May 14, 2:00 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Fentress, Overton, Pickett	30 min
May 14, 2:06 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury, Williamson	24 min
May 14, 2:32 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Cumberland, Fentress, Jackson, Overton, Pickett and 1 more	43 min
May 14, 2:43 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Marshall, Maury, Williamson	32 min
May 14, 2:46 PM CDT	Severe Thunderstorm Warning	OHX	Jackson, Putnam, Smith, Trousdale, Wilson	29 min
May 14, 2:58 PM CDT	Severe Thunderstorm Warning	OHX	Perry	32 min
May 14, 3:13 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Maury, Rutherford, Williamson, Wilson	32 min
May 14, 3:14 PM CDT	Flash Flood Warning	OHX	Clay, Jackson, Pickett	3 hr
May 14, 3:15 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Overton, Pickett	30 min
May 14, 3:17 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	28 min
May 14, 3:20 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	25 min
May 14, 3:35 PM CDT	Flash Flood Warning	OHX	Davidson, Williamson	3 hr
May 14, 3:42 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Pickett	18 min
May 14, 3:44 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	31 min
May 14, 4:04 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Perry	26 min
May 14, 4:06 PM CDT	Flash Flood Warning	OHX	Cumberland	3 hr
May 14, 4:25 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Perry	50 min
May 14, 4:49 PM CDT	Severe Thunderstorm Warning	OHX	Perry	26 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2010 Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.