Alert archive / Tennessee / Winter Storm Warnings in 2010

Winter Storm Warning 9, NWS Morristown, TN

December 25, 20109 counties in Tennessee; 5 counties in Virginia; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this winter storm warning at Dec 25, 2010, 4:07 PM EST for 9 counties in Tennessee; 5 counties in Virginia; Cherokee County, Clay County, North Carolina. It was in force for 45 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: Dec 25, 2010, 4:07 PM EST (21:07 UTC)
Expired: Dec 27, 2010, 1:00 PM EST
In force: 45 hr
Issued by: NWS Morristown, TN

Counties Cherokee County, NC, Clay County, NC, Blount County, TN, Carter County, TN, Cocke County, TN, Greene County, TN, Johnson County, TN, Monroe County, TN, Polk County, TN, Sevier County, TN, Unicoi County, TN, City of Bristol, VA, City of Norton, VA, Russell County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 38 km from the middle of the area, began a volume at 21:07 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 12:00Z, 9.1 hours before the alert went out and 332 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1663 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this winter storm warning went out at Dec 25, 3:09 PM EST, 58 minutes earlier.

Area forecast discussion, Dec 25, 3:09 PM EST, 58 minutes before

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Hazardous weather outlook, Dec 25, 3:58 AM EST, 12 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
358 AM EST SAT DEC 25 2010

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-260900-
CHEROKEE-CLAY-SCOTT TN-CAMPBELL-CLAIBORNE-HANCOCK-HAWKINS-
SULLIVAN-JOHNSON-MORGAN-ANDERSON-UNION-GRAINGER-HAMBLEN-
NORTHWEST COCKE-COCKE SMOKY MOUNTAINS-NORTHWEST GREENE-
SOUTHEAST GREENE-WASHINGTON TN-UNICOI-NORTHWEST CARTER-
SOUTHEAST CARTER-ROANE-LOUDON-KNOX-JEFFERSON-NW BLOUNT-
BLOUNT SMOKY MOUNTAINS-NORTH SEVIER-SEVIER SMOKY MOUNTAINS-
SEQUATCHIE-BLEDSOE-RHEA-MEIGS-MCMINN-NORTHWEST MONROE-
SOUTHEAST MONROE-MARION-HAMILTON-BRADLEY-WEST POLK-EAST POLK-LEE-
WISE-SCOTT-RUSSELL-WASHINGTON-
358 AM EST SAT DEC 25 2010 /258 AM CST SAT DEC 25 2010/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH
CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT

A WINTER STORM WILL AFFECT THE AREA TODAY AND TONIGHT. A WINTER
WEATHER ADVISORY IS IN EFFECT FOR THE ENTIRE AREA TODAY...WITH 1
TO 4 INCHES EXPECTED AREA WIDE. A WINTER STORM WATCH IS IN EFFECT
FOR SOUTHWEST VIRGINIA AND THE HIGHER ELEVATIONS OF EAST
TENNESSEE...WHERE ADDITIONAL ACCUMULATIONS ARE EXPECTED TONIGHT
THROUGH MONDAY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SNOW SHOWERS ARE EXPECTED TO PERSIST OVER SOUTHWEST VIRGINIA AND
THE MOUNTAINS OF EAST TENNESSEE SUNDAY THROUGH MONDAY. ADDITIONAL
ACCUMULATIONS OF 5 TO 12 INCHES WILL BE POSSIBLE OVER THE HIGHER
TERRAIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION FOR SNOW REPORTS WILL BE NEEDED THROUGH THIS
WEEKEND.

In the hours before

Local storm report, Dec 25, 11:05 AM EST, 5 hours 2 minutes before

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Local storm report, Dec 25, 11:07 AM EST, 5 hours before

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Local storm report, Dec 25, 11:45 AM EST, 4 hours 22 minutes before

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Local storm report, Dec 25, 1:35 PM EST, 2 hours 32 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 25, 9:11 AM EST	Winter Storm Warning	MRX	Blount, Bradley, Cocke, Hamilton, McMinn, Marion and 4 more	7 hr
Dec 25, 4:07 PM EST	Winter Weather Advisory	MRX	Anderson, Bledsoe, Blount, Campbell, Carter, Claiborne and 19 more	31 hr

Nearby

Winter Storm Warnings in Tennessee, 2010 Winter Storm Warnings in Virginia, 2010 Winter Storm Warnings in North Carolina, 2010 Every winter storm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.