Alert archive / Tennessee / Special Weather Statements in 2011

Special Weather Statement, NWS Nashville, TN

October 18, 20114 counties in Tennessee

NWS Nashville, TN issued this special weather statement at Oct 18, 2011, 7:42 PM CDT for 4 counties in Tennessee. It was in force for 63 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: Oct 18, 2011, 7:42 PM CDT (00:42 UTC)
Expired: Oct 18, 2011, 8:45 PM CDT
In force: 63 min
Issued by: NWS Nashville, TN

Counties Cumberland County, TN, Fentress County, TN, Overton County, TN, Pickett County, TN

The radar

The Knoxville radar (KMRX), 134 km from the middle of the area, began a volume at 00:43 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.7 hours before the alert went out and 318 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: 736 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 514 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.5

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 Oct 18, 6:44 PM CDT, 58 minutes earlier.

Area forecast discussion, Oct 18, 6:44 PM CDT, 58 minutes before

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Hazardous weather outlook, Oct 18, 6:05 PM CDT, 1 hour 37 minutes before

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In the hours before

Local storm report, Oct 18, 5:47 PM CDT, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
547 PM CDT TUE OCT 18 2011

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

0450 PM     TSTM WND DMG     2 N PULASKI             35.22N 87.03W
10/18/2011                   GILES              TN   BROADCAST MEDIA

            REPORT OF TREES DOWN ON NORTH SIDE OF PULASKI WITH POWER
            OUTAGES. TIME ESTIMATED BASED ON RADAR.

&&

SHAMBURGER

Special weather statement, Oct 18, 6:02 PM CDT, 1 hour 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
602 PM CDT TUE OCT 18 2011

TNZ062-063-077-182330-
CANNON-COFFEE-RUTHERFORD-
602 PM CDT TUE OCT 18 2011

...SIGNIFICANT WEATHER ADVISORY FOR CANNON...EXTREME NORTHWESTERN
COFFEE AND SOUTHEASTERN RUTHERFORD COUNTIES...

AT 600 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 14 MILES SOUTHWEST OF WOODBURY...MOVING NORTHEAST
AT 30 MPH.

THIS STORM WILL BE NEAR...
  WOODBURY BY 625 PM CDT.

HALF INCH SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3592 8610 3584 8590 3573 8600 3567 8600
      3564 8624 3567 8631

55

Local storm report, Oct 18, 6:16 PM CDT, 1 hour 26 minutes before

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Special weather statement, Oct 18, 6:23 PM CDT, 1 hour 19 minutes before

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Local storm report, Oct 18, 7:04 PM CDT, 38 minutes before

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Special weather statement, Oct 18, 7:42 PM CDT, 0 minutes before

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Nearby

Special Weather Statements in Tennessee, 2011 Every special weather statement in 2011

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.