Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 228, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jun 18, 2009, 3:30 PM EDT for Blount County, Sevier County, Tennessee. It was in force for 30 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
- Jun 18, 2009, 3:30 PM EDT (19:30 UTC)
- Expired
- Jun 18, 2009, 4:00 PM EDT
- In force
- 30 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
Counties Blount County, TN, Sevier County, TN
The radar
The Knoxville radar (KMRX), 56 km from the middle of the area, began a volume at 19:31 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 |
|---|---|---|---|
| Jun 18, 10:39 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 7.5 hours before the alert went out and 263 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
- 3054 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 702 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 3.9
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 Jun 18, 2:40 PM EDT, 50 minutes earlier.
Area forecast discussion, Jun 18, 2:40 PM EDT, 50 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 448 AM EDT THU JUN 18 2009 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-190900- 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- 448 AM EDT THU JUN 18 2009 /348 AM CDT THU JUN 18 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS WILL REDEVELOP ACROSS MUCH OF EAST TENNESSEE... SOUTHWEST VIRGINIA...AND SOUTHWEST NORTH CAROLINA THIS AFTERNOON. THE AIRMASS WILL BE QUITE UNSTABLE AND MOIST...CAPABLE OF PRODUCING STRONG TO SEVERE THUNDERSTORMS. THE MAIN CONCERN WILL BE DAMAGING WINDS...WITH LARGE HAIL AND ISOLATED TORNADOES POSSIBLE. BESIDES THE SEVERE STORMS...TORRENTIAL RAINS ARE ALSO ANTICIPATED WHICH MAY PRODUCE LOCALIZED FLASH FLOODING OF SMALL STREAMS...LOW LYING AREAS...AND MUD SLIDES. LOCATIONS THAT HAVE RECEIVED RAIN OVER THE PAST FEW DAYS WILL BE PARTICULARLY VULNERABLE TO FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED TODAY.
In the hours before
Local storm report, Jun 18, 2:54 PM EDT, 36 minutes before
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</html>Local storm report, Jun 18, 2:58 PM EDT, 32 minutes before
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</html>Local storm report, Jun 18, 3:00 PM EDT, 30 minutes before
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</html>Local storm report, Jun 18, 3:12 PM EDT, 18 minutes before
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</html>Local storm report, Jun 18, 3:21 PM EDT, 9 minutes before
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</html>Local storm report, Jun 18, 3:25 PM EDT, 5 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 |
|---|---|---|---|---|
| Jun 17, 8:10 PM EDT | Areal Flood Advisory | MRX | Blount, Cocke, Knox, Loudon, Monroe, Roane and 1 more | 3 hr |
| Jun 17, 8:13 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Loudon, McMinn, Monroe, Polk | 47 min |
| Jun 17, 8:29 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Blount, Knox, Loudon, Morgan, Roane and 1 more | 61 min |
| Jun 17, 8:42 PM EDT | Flash Flood Warning | MRX | Anderson, Blount, Knox, Loudon, Roane, Sevier | 3 hr |
| Jun 17, 8:47 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Loudon, Monroe, Polk | 58 min |
| Jun 17, 9:49 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Monroe | 56 min |
| Jun 17, 10:16 PM EDT | Severe Thunderstorm Warning | MRX | Bradley, McMinn, Monroe, Polk | 59 min |
| Jun 17, 11:17 PM EDT | Severe Thunderstorm Warning | MRX | McMinn, Monroe, Polk | 44 min |
| Jun 18, 12:52 PM EDT | Severe Thunderstorm Warning | MRX | Morgan, Scott | 53 min |
| Jun 18, 1:17 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell | 58 min |
| Jun 18, 1:42 PM EDT | Severe Thunderstorm Warning | MRX | Morgan, Scott | 63 min |
| Jun 18, 1:49 PM EDT | Severe Thunderstorm Warning | MRX | Knox, Union | 56 min |
| Jun 18, 2:07 PM EDT | Severe Thunderstorm Warning | MRX | Claiborne, Hancock, Hawkins | 53 min |
| Jun 18, 2:13 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell | 32 min |
| Jun 18, 2:17 PM EDT | Severe Thunderstorm Warning | MRX | Loudon, Roane | 58 min |
| Jun 18, 2:26 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Sevier | 64 min |
| Jun 18, 2:30 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Hamblen, Jefferson | 60 min |
| Jun 18, 2:45 PM EDT | Severe Thunderstorm Warning | MRX | Knox | 30 min |
| Jun 18, 2:45 PM EDT | Severe Thunderstorm Warning | MRX | Greene, Hawkins, Sullivan, Washington | 60 min |
| Jun 18, 2:54 PM EDT | Severe Thunderstorm Warning | MRX | Monroe | 66 min |
| Jun 18, 3:08 PM EDT | Severe Thunderstorm Warning | MRX | Cocke | 52 min |
| Jun 18, 3:13 PM EDT | Severe Thunderstorm Warning | MRX | Loudon | 32 min |
| Jun 18, 3:14 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Greene, Johnson, Sullivan, Unicoi, Washington | 45 min |
| Jun 18, 1:38 PM EDT | Severe Thunderstorm Warning | MRX | Lee, Scott, Wise, City of Norton | 52 min |
| Jun 18, 2:28 PM EDT | Severe Thunderstorm Warning | MRX | Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more | 62 min |
| Jun 17, 10:48 PM EDT | Severe Thunderstorm Warning | MRX | Cherokee, Clay | 57 min |
| Jun 18, 3:47 PM EDT | Severe Thunderstorm Warning | MRX | Cherokee, Clay | 41 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2009Every severe thunderstorm warning in 2009
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.