Alert archive / Tennessee / Freeze Warnings in 2007

Freeze Warning 1, NWS Nashville, TN

April 4, 200739 counties in Tennessee

NWS Nashville, TN issued this freeze warning at Apr 4, 2007, 2:46 AM CDT for 39 counties in Tennessee. It took effect at Apr 5, 2007, 1:00 AM CDT. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 4, 2007, 2:46 AM CDT (07:46 UTC)
In effect from: Apr 5, 2007, 1:00 AM CDT
Expired: Apr 5, 2007, 7:39 AM CDT
In force: 7 hr
Issued by: NWS Nashville, TN

All 39 counties

Bedford County, TN, Benton County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 29 km from the middle of the area, began a volume at 07:47 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 00:00Z, 7.8 hours before the alert went out and 18 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: 1678 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1714 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 10.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze 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 freeze warning went out at Apr 3, 8:30 PM CDT, 6 hours 16 minutes earlier.

Area forecast discussion, Apr 3, 8:30 PM CDT, 6 hours 16 minutes before

AREA FORECAST DISCUSSION...UPDATED TIMING
NATIONAL WEATHER SERVICE NASHVILLE TN
830 PM CDT TUE APR 3 2007

.DISCUSSION...
LEADING EDGE OF STRONG THUNDERSTORMS IS ALONG A LINE FROM PICKETT
COUNTY TO SRN MACON COUNTY TO NRN DAVIDSON COUNTY TO NRN PERRY
COUNTY. THIS LINE IS MOVING TOWARD THE SE AT 30 MPH. MOST REPORTS OF
SEVERE WEATHER ARE FOR DAMAGING HAIL WITH A FEW REPORTS OF
DAMAGING WIND. THERE IS ALSO A POSSIBILITY OF ISOLATED TORNADOES
DUE MAINLY TO THE STRONG SHEAR NOTED IN RECENT SOUNDINGS.

WE EXPECT THIS LINE TO CONTINUE SEWD AND MOVE OUT OF THE AREA
BY 4-5 AM.  THE SVR TSTM WATCH WAS CANCELLED FOR MONTGOMERY...STEWART
AND HOUSTON COUNTIES. WE WILL CONTINUE TO CLEAR COUNTIES IN THE
CURRENT TORNADO WATCH AS CONVECTION MAKES ITS WAY EWD.
&&

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

JLM

Hazardous weather outlook, Apr 3, 11:08 PM CDT, 3 hours 38 minutes before

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In the hours before

Local storm report, Apr 3, 10:15 PM CDT, 4 hours 31 minutes before

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Local storm report, Apr 3, 10:29 PM CDT, 4 hours 17 minutes before

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Local storm report, Apr 3, 10:48 PM CDT, 3 hours 58 minutes before

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Local storm report, Apr 3, 10:55 PM CDT, 3 hours 51 minutes before

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Local storm report, Apr 3, 11:18 PM CDT, 3 hours 28 minutes before

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Local storm report, Apr 4, 1:56 AM CDT, 50 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
Apr 3, 7:15 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Houston, Humphreys	60 min
Apr 3, 7:45 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	30 min
Apr 3, 8:06 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Robertson	39 min
Apr 3, 8:26 PM CDT	Severe Thunderstorm Warning	OHX	Dickson	34 min
Apr 3, 8:28 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, White	32 min
Apr 3, 8:32 PM CDT	Severe Thunderstorm Warning	OHX	Perry	28 min
Apr 3, 8:41 PM CDT	Severe Thunderstorm Warning	OHX	Hickman	49 min
Apr 3, 8:57 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Williamson, Wilson	48 min
Apr 3, 9:00 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	45 min
Apr 3, 9:07 PM CDT	Severe Thunderstorm Warning	OHX	Maury	23 min
Apr 3, 9:12 PM CDT	Tornado Warning	OHX	Cumberland	33 min
Apr 3, 9:34 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	26 min
Apr 3, 9:38 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Rutherford	37 min
Apr 3, 9:44 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	31 min
Apr 3, 9:55 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee	35 min
Apr 4, 2:46 AM CDT	Freeze Watch	OHX	Bedford, Benton, Cannon, Cheatham, Clay, Coffee and 33 more	24 hr

Nearby

Freeze Warnings in Tennessee, 2007 Every freeze warning in 2007

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.