Alert archive / Tennessee / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 25, NWS Morristown, TN

May 14, 2010Loudon County, Meigs County, Roane County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at May 14, 2010, 6:30 PM EDT for Loudon County, Meigs County, Roane County, Tennessee. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 14, 2010, 6:30 PM EDT (22:30 UTC)
Expired: May 14, 2010, 7:15 PM EDT
In force: 45 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Loudon County, TN, Meigs County, TN, Roane County, TN

The radar

The Knoxville radar (KMRX), 116 km from the middle of the area, began a volume at 22:32 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 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, 12:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.5 hours before the alert went out and 191 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

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 Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at May 14, 5:17 PM EDT, 1 hour 13 minutes earlier.

Area forecast discussion, May 14, 5:17 PM EDT, 1 hour 13 minutes before

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Hazardous weather outlook, May 14, 3:57 AM EDT, 14 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
357 AM EDT FRI MAY 14 2010

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-150900-
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-
357 AM EDT FRI MAY 14 2010 /257 AM CDT FRI MAY 14 2010/

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

.DAY ONE...TODAY AND TONIGHT

A WEAK COLD FRONT WILL SAG SOUTH INTO THE REGION TODAY. SCATTERED
SHOWERS AND THUNDERSTORMS CAN BE EXPECTED...AND SOME OF THESE
THUNDERSTORMS MAY BECOME SEVERE THIS AFTERNOON WITH DAMAGING WINDS
AND LARGE HAIL THE PRIMARY THREATS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SOME SHOWERS AND THUNDERSTORMS WILL CONTINUE TO BE IN THE FORECAST
THROUGH THE WEEKEND INTO EARLY NEXT WEEK. SOME OF THESE
THUNDERSTORMS MAY BECOME SEVERE...ESPECIALLY ON SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AT TIMES TODAY AND THROUGH THE
WEEKEND.

In the hours before

Special weather statement, May 14, 5:35 PM EDT, 55 minutes before

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Local storm report, May 14, 5:43 PM EDT, 47 minutes before

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Special weather statement, May 14, 5:59 PM EDT, 31 minutes before

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Local storm report, May 14, 6:23 PM EDT, 7 minutes before

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Special weather statement, May 14, 6:27 PM EDT, 3 minutes before

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Special weather statement, May 14, 6:27 PM EDT, 3 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
May 14, 4:21 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	39 min
May 14, 4:25 PM EDT	Areal Flood Advisory	MRX	Anderson, Bledsoe, Campbell, Morgan, Roane, Scott	4 hr
May 14, 4:32 PM EDT	Flash Flood Warning	MRX	Bledsoe	118 min
May 14, 4:41 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Roane	45 min
May 14, 4:51 PM EDT	Flash Flood Warning	MRX	Campbell, Scott	3 hr
May 14, 4:57 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Morgan, Scott	52 min
May 14, 5:05 PM EDT	Severe Thunderstorm Warning	MRX	Meigs, Rhea	40 min
May 14, 5:46 PM EDT	Severe Thunderstorm Warning	MRX	Meigs, Rhea, Roane	44 min
May 14, 6:14 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Rhea	3 hr
May 14, 6:41 PM EDT	Areal Flood Advisory	MRX	Meigs, Roane	3 hr
May 14, 7:19 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Meigs	34 min
May 14, 5:08 PM EDT	Severe Thunderstorm Warning	MRX	Lee, Wise	67 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.