Alert archive / Virginia / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 147, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Aug 4, 2010, 6:44 PM EDT for 4 counties in Virginia. It was in force for 46 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
- Aug 4, 2010, 6:44 PM EDT (22:44 UTC)
- Expired
- Aug 4, 2010, 7:30 PM EDT
- In force
- 46 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
Counties City of Norton, VA, Russell County, VA, Scott County, VA, Wise County, VA
The radar
The Jackson,KY radar (KJKL), 107 km from the middle of the area, began a volume at 22:44 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
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.7 hours before the alert went out and 248 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.
- Mixed-layer CAPE
- 2039 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 677 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
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 Aug 4, 3:30 PM EDT, 3 hours 14 minutes earlier.
Area forecast discussion, Aug 4, 3:30 PM EDT, 3 hours 14 minutes before
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HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MORRISTOWN TN 150 PM EDT WED AUG 4 2010 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-051000- 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- 150 PM EDT (1250 PM CDT) WED AUG 4 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST TENNESSEE...SOUTHWEST VIRGINIA AND EXTREME SOUTHWEST NORTH CAROLINA. .DAY ONE...TODAY AND TONIGHT ANOTHER HOT DAY IS IN STORE FOR THE SOUTHERN APPALACHIAN REGION... WITH ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS POSSIBLE AROUND THE HIGHER ELEVATIONS. THE COMBINATION OF VERY HOT TEMPERATURES AND HIGH HUMIDITY LEVELS WILL PRODUCE HEAT INDICES ABOVE 100 DEGREES ACROSS MUCH OF THE REGION. FOR MORE DETAILS...PLEASE SEE THE HEAT ADVISORY ISSUED FOR THE SOUTHERN AND CENTRAL AREAS OF THE GREAT TENNESSEE VALLEY WHERE HEAT INDICES WILL EXCEED 105 DEGREES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY HEAT INDICES ARE ONCE AGAIN EXPECTED TO EXCEED 100 DEGREES OVER MOST OF THE REGION BY THURSDAY AFTERNOON...BUT WITH A WEAK COLD FRONT APPROACHING THE REGION. THIS COLD FRONT WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS ON THURSDAY...WITH A FEW OF THESE STORMS POSSIBLY BECOMING STRONG TO SEVERE DURING THE AFTERNOON AND EVENING HOURS. THESE STORMS WILL HAVE THE POTENTIAL TO PRODUCE DAMAGING WINDS...LARGE HAIL...FREQUENT CLOUD TO GROUND LIGHTNING...AND LOCALLY HEAVY RAINFALL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED ON THURSDAY AFTERNOON AND EVENING. DMG
In the hours before
Special weather statement, Aug 4, 3:35 PM EDT, 3 hours 9 minutes before
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</html>Special weather statement, Aug 4, 3:58 PM EDT, 2 hours 46 minutes before
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</html>Special weather statement, Aug 4, 5:09 PM EDT, 1 hour 35 minutes before
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</html>Special weather statement, Aug 4, 5:34 PM EDT, 1 hour 10 minutes before
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</html>Special weather statement, Aug 4, 5:59 PM EDT, 45 minutes before
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</html>The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 4:44 PM EDT | Areal Flood Advisory | MRX | Claiborne | 2 hr |
| Aug 4, 5:44 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Johnson, Sullivan | 46 min |
| Aug 4, 6:26 PM EDT | Areal Flood Advisory | MRX | Carter, Hancock, Hawkins, Johnson, Sullivan, Washington | 119 min |
| Aug 4, 6:07 PM EDT | Severe Thunderstorm Warning | MRX | Lee, Scott, Wise, City of Norton | 38 min |
| Aug 4, 7:50 PM EDT | Severe Thunderstorm Warning | MRX | Russell, Washington | 30 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2010Every 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.