Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 217, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jul 21, 2008, 4:53 PM CDT for Marion County, Tennessee. It was in force for 52 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
- Jul 21, 2008, 4:53 PM CDT (21:53 UTC)
- Expired
- Jul 21, 2008, 5:45 PM CDT
- In force
- 52 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
County Marion County, TN
The radar
The Northeast Alabama radar (KHTX), 47 km from the middle of the area, began a volume at 21:55 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 |
|---|---|---|---|
| Jul 21, 2:44 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.9 hours before the alert went out and 142 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
- 2596 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 1158 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 21, 4:03 PM CDT, 50 minutes earlier.
Area forecast discussion, Jul 21, 4:03 PM CDT, 50 minutes before
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HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MORRISTOWN TN 920 AM EDT MON JUL 21 2008 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-221200- 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- 920 AM EDT MON JUL 21 2008 /820 AM CDT MON JUL 21 2008/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT A COLD FRONT WILL REMAIN NEARLY STATIONARY ACROSS THE OHIO VALLEY. HOWEVER UPPER LEVEL FLOW WILL CAUSE SHOWERS AND THUNDERSTORMS TO MOVE SOUTHEAST TOWARDS NORTHEAST TENNESSEE AND SOUTHWEST VIRGINIA THIS AFTERNOON. INCREASED MOISTURE AND DAYTIME HEATING COMBINED WITH HOT TEMPERATURES WILL CAUSE A FEW STORMS TO BE STRONG AND POSSIBLY SEVERE LATE THIS AFTERNOON AND EVENING WITH DAMAGING WINDS AND LARGE HAIL POSSIBLE ESPECIALLY ACROSS NORTHERN TENNESSEE AND SOUTHWEST VIRGINIA. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY UPPER LEVEL TROUGH DROPPING SOUTH AND EAST FROM THE OHIO VALLEY INTO THE TENNESSEE VALLEY AND ACCOMPANYING COLD FRONT WILL CREATE AN UNSTABLE ENVIRONMENT WHEN COMBINED WITH AMPLE MOISTURE AND DAYTIME HEATING TUESDAY FOR POSSIBLE SEVERE THUNDERSTORMS WITH DAMAGING WINDS THE MAIN THREAT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY DUE TO THE ISOLATED NATURE OF THE SEVERE WEATHER...BUT MAY BE NEEDED TUESDAY AFTERNOON AND EVENING. TD
In the hours before
Local storm report, Jul 21, 3:20 PM CDT, 1 hour 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
420 PM EDT MON JUL 21 2008
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0415 PM TSTM WND DMG ROCKWOOD 35.87N 84.68W
07/21/2008 ROANE TN AMATEUR RADIO
NUMEROUS TREES DOWN IN ROCKWOOD. REPORTED BY SHERIFFS
DISPATCH OFFICE.
&&Local storm report, Jul 21, 3:52 PM CDT, 1 hour 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
452 PM EDT MON JUL 21 2008
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0425 PM TSTM WND DMG ONEIDA 36.50N 84.51W
07/21/2008 SCOTT TN LAW ENFORCEMENT
FEW TREES DOWN.
&&Local storm report, Jul 21, 3:56 PM CDT, 57 minutes before
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</html>Local storm report, Jul 21, 4:27 PM CDT, 26 minutes before
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</html>Local storm report, Jul 21, 4:37 PM CDT, 16 minutes before
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</html>Local storm report, Jul 21, 4:47 PM CDT, 6 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 |
|---|---|---|---|---|
| Jul 21, 2:15 PM CDT | Severe Thunderstorm Warning | MRX | Grainger, Hamblen | 45 min |
| Jul 21, 2:18 PM CDT | Severe Thunderstorm Warning | MRX | Hawkins, Sullivan | 42 min |
| Jul 21, 2:23 PM CDT | Severe Thunderstorm Warning | MRX | Sullivan | 52 min |
| Jul 21, 2:43 PM CDT | Severe Thunderstorm Warning | MRX | Campbell, Claiborne, Scott | 62 min |
| Jul 21, 2:53 PM CDT | Severe Thunderstorm Warning | MRX | Loudon, McMinn, Meigs, Rhea, Roane | 52 min |
| Jul 21, 3:15 PM CDT | Severe Thunderstorm Warning | MRX | Cocke | 30 min |
| Jul 21, 3:18 PM CDT | Severe Thunderstorm Warning | MRX | Carter, Johnson, Sullivan | 57 min |
| Jul 21, 3:26 PM CDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Claiborne, Grainger, Scott, Union | 64 min |
| Jul 21, 3:45 PM CDT | Severe Thunderstorm Warning | MRX | Loudon, McMinn, Meigs, Monroe, Rhea, Roane | 60 min |
| Jul 21, 3:53 PM CDT | Severe Thunderstorm Warning | MRX | Anderson, Morgan, Roane | 67 min |
| Jul 21, 4:01 PM CDT | Areal Flood Advisory | MRX | McMinn, Meigs, Rhea, Roane | 3 hr |
| Jul 21, 4:01 PM CDT | Severe Thunderstorm Warning | MRX | Knox, Union | 59 min |
| Jul 21, 4:11 PM CDT | Severe Thunderstorm Warning | MRX | Carter, Unicoi | 20 min |
| Jul 21, 4:13 PM CDT | Flash Flood Warning | MRX | Meigs, Rhea, Roane | 81 min |
| Jul 21, 4:13 PM CDT | Severe Thunderstorm Warning | MRX | Blount, Cocke, Jefferson, Loudon, Monroe, Sevier | 62 min |
| Jul 21, 4:20 PM CDT | Severe Thunderstorm Warning | MRX | Grainger, Jefferson | 40 min |
| Jul 21, 4:29 PM CDT | Areal Flood Advisory | MRX | Knox | 69 min |
| Jul 21, 4:36 PM CDT | Severe Thunderstorm Warning | MRX | Grainger, Hamblen | 54 min |
| Jul 21, 4:45 PM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Loudon, McMinn, Meigs, Monroe, Rhea and 1 more | 60 min |
| Jul 21, 4:59 PM CDT | Severe Thunderstorm Warning | MRX | Knox | 25 min |
| Jul 21, 5:03 PM CDT | Severe Thunderstorm Warning | MRX | Bradley, Hamilton, Polk | 57 min |
| Jul 21, 5:09 PM CDT | Severe Thunderstorm Warning | MRX | Cocke, Jefferson | 24 min |
| Jul 21, 5:15 PM CDT | Severe Thunderstorm Warning | MRX | Blount, Cocke, Jefferson, Loudon, Monroe, Sevier | 60 min |
| Jul 21, 5:48 PM CDT | Severe Thunderstorm Warning | MRX | Polk | 42 min |
| Jul 21, 5:57 PM CDT | Severe Thunderstorm Warning | MRX | Bradley, Hamilton, Polk | 48 min |
| Jul 21, 6:14 PM CDT | Severe Thunderstorm Warning | MRX | Marion | 46 min |
| Jul 21, 5:41 PM CDT | Severe Thunderstorm Warning | MRX | Cherokee, Clay | 54 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2008Every severe thunderstorm warning in 2008
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.