Alert archive / Tennessee / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 53, NWS Nashville, TN

May 25, 2015Cannon County, Coffee County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at May 25, 2015, 2:40 PM CDT for Cannon County, Coffee County, Tennessee. It was in force for 35 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: May 25, 2015, 2:40 PM CDT (19:40 UTC)
Expired: May 25, 2015, 3:15 PM CDT
In force: 35 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cannon County, TN, Coffee County, TN

The radar

The Northeast Alabama radar (KHTX), 71 km from the middle of the area, began a volume at 19:43 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.7 hours before the alert went out and 84 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: 4 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 1281 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 309 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.

031 
WUUS54 KOHX 251940
SVROHX
TNC015-031-252015-
/O.NEW.KOHX.SV.W.0053.150525T1940Z-150525T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
240 PM CDT MON MAY 25 2015

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL CANNON COUNTY IN MIDDLE TENNESSEE...
  NORTHERN COFFEE COUNTY IN MIDDLE TENNESSEE...

* UNTIL 315 PM CDT

* AT 240 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  MANCHESTER...AND MOVING NORTHEAST AT 25 MPH.

  HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF NORTHERN
  COFFEE AND SOUTH CENTRAL CANNON COUNTIES...INCLUDING THE FOLLOWING
  LOCATIONS...SUMMITVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3542 8611 3559 8621 3572 8599 3565 8598
      3561 8595 3559 8595 3556 8593 3555 8591
      3554 8590 3554 8588 3553 8588
TIME...MOT...LOC 1940Z 231DEG 19KT 3553 8611

HAIL...0.75IN
WIND...60MPH

$$

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 25, 2:21 PM CDT, 19 minutes earlier.

Area forecast discussion, May 25, 2:21 PM CDT, 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
221 PM CDT MON MAY 25 2015

.DISCUSSION...A PERSISTENT BAND OF SHOWERS CONTINUES TO MOVE
SLOWLY EASTWARD ACROSS MIDDLE TENNESSEE, WITH A FEW STRONGER
CELLS PASSING THROUGH SOUTHERN PARTS. HRRR HAS PERFORMED QUITE
WELL TODAY, AND THE SHORT-RANGE MODEL HAS CONSISTENTLY SHOWN A
DECREASE IN THE ACTIVITY FROM LATE AFTERNOON THROUGH EVENING, SO
AM SPLITTING TONIGHT'S POP GRID INTO 6-HOUR INCREMENTS, WITH
REDUCED POP'S FROM 00Z THROUGH 06Z. NAM SHOWS A WEAK TROUGH MOVING
INTO MIDDLE TENNESSEE TOMORROW MORNING ALONG WITH THE NEXT WAVE OF
MOISTURE, THEREBY PUSHING THE DRY WEDGE NORTHWARD AND BRINGING
LIKELY TO CATEGORICAL POP'S BACK IN. SPC IS KEEPING THE ENTIRE MID
STATE UNDER A SLIGHT RISK OF SEVERE STORMS TOMORROW AND TOMORROW
NIGHT, AND A MARGINAL RISK FOR DAY 3. MODEL SOUNDINGS CONTINUE TO
SHOW GOOD INSTABILITY FOR THE NEXT SEVERAL DAYS, MAINLY DURING
PEAK HEATING HOURS, WITH VERY LITTLE AIR MASS CHANGE FOR THE
FORESEEABLE FUTURE. FOLLOWING WEDNESDAY'S ANTICIPATED SHORTWAVE
PASSAGE, THE UPPER PATTERN BREAKS DOWN INTO A MUCH WEAKER FLOW,
WITH HIGH PRESSURE ESTABLISHING ITSELF OFF THE EAST COAST, VERY
SUMMER-LIKE. WE MAY SEE A FRONTAL PASSAGE EARLY NEXT WEEK, BUT AT
THIS POINT THE GFS AND ECMWF SOLUTIONS DIVERGE TO THE POINT THAT
ANY CONFIDENCE REGARDING TIMING IS LOW. TEMPERATURES WILL
GRADUALLY WARM THROUGHOUT THE WEEK, WITH READINGS SEVERAL DEGREES
ABOVE NORMAL FROM WEDNESDAY ON.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      66  82  66  86 /  40  70  30  30
CLARKSVILLE    67  83  65  84 /  40  70  30  30
CROSSVILLE     65  76  65  77 /  60  70  70  50
COLUMBIA       66  81  66  86 /  40  80  40  30
LAWRENCEBURG   66  80  65  84 /  40  80  50  40
WAVERLY        67  82  66  85 /  40  80  30  30

&&

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

&&

ROSE

Hazardous weather outlook, May 25, 5:02 AM CDT, 9 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
502 AM CDT MON MAY 25 2015

TNZ005>011-023>034-056>066-075-077>080-093>095-261015-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-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-
502 AM CDT MON MAY 25 2015

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.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR MIDDLE
TENNESSEE ON TUESDAY. SCATTERED THUNDERSTORMS MAY DEVELOP DURING
THE DAY ON TUESDAY...WITH SOME SEVERE STORMS POSSIBLE. DAMAGING
WINDS AND HAIL MAY BE POSSIBLE WITH STRONGER THUNDERSTORMS.

.SPOTTER CALL TO ACTION STATEMENT...

REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED.

06

In the hours before

Special weather statement, May 25, 1:49 PM CDT, 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
149 PM CDT MON MAY 25 2015

TNZ075-077-251915-
BEDFORD-COFFEE-
149 PM CDT MON MAY 25 2015

...SIGNIFICANT WEATHER ADVISORY FOR BEDFORD AND COFFEE COUNTIES...

AT 145 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR SHELBYVILLE...MOVING NORTHEAST AT 35 MPH.

SOME LOCATIONS IN THE PATH INCLUDE RAUS...SHELBYVILLE...WARTRACE...
NORMANDY AND BELL BUCKLE.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3546 8654 3564 8637 3540 8615 3536 8627
      3538 8626 3538 8628 3540 8628 3541 8628
      3536 8633 3536 8636 3534 8637 3535 8639
      3533 8641

07

Special weather statement, May 25, 2:11 PM CDT, 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
211 PM CDT MON MAY 25 2015

TNZ075-077-252000-
BEDFORD-COFFEE-
211 PM CDT MON MAY 25 2015

...SIGNIFICANT WEATHER ADVISORY FOR BEDFORD AND COFFEE COUNTIES...

AT 210 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR SHELBYVILLE...MOVING NORTHEAST AT 30 MPH.

SOME LOCATIONS IN THE PATH INCLUDE WARTRACE...NORMANDY...BELL BUCKLE
AND BEECHGROVE.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3554 8644 3565 8629 3563 8624 3568 8625
      3570 8622 3550 8602 3541 8629

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 1:49 PM CDT	Special Weather Statement	OHX	Bedford	26 min
May 25, 2:11 PM CDT	Special Weather Statement	OHX	Coffee	49 min
May 25, 2:59 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Grundy, Warren	31 min
May 25, 4:04 PM CDT	Special Weather Statement	OHX	Fentress, Overton	41 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2015 Every severe thunderstorm warning in 2015

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.