Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 254, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jul 28, 2008, 7:16 PM EDT for Knox County, Tennessee. It was in force for 29 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 28, 2008, 7:16 PM EDT (23:16 UTC)
- Expired
- Jul 28, 2008, 7:45 PM EDT
- In force
- 29 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
County Knox County, TN
The radar
The Knoxville radar (KMRX), 52 km from the middle of the area, began a volume at 23:15 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
Nashville Metro, TN (KBNA), launched 12:00Z, 11.3 hours before the alert went out and 240 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
- 2252 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 727 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.0
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 28, 3:11 PM EDT, 4 hours 5 minutes earlier.
Area forecast discussion, Jul 28, 3:11 PM EDT, 4 hours 5 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 311 PM EDT MON JUL 28 2008 .SHORT TERM (TONIGHT AND TUESDAY)...A SHORTWAVE IS TRIGGERING ISOLATED THUNDERSTORMS ACROSS THE CWA THIS AFTERNOON. WITH MODERATE INSTABILITY IN PLACE...SOME STRONG STORMS WILL BE POSSIBLE THIS AFTERNOON INCLUDING A FEW MORE SEVERE STORMS. BUT LACK OF DEEP MOISTURE SHOULD KEEP STORMS FROM INCREASING IN COVERAGE...SO ONLY WENT WITH SLIGHT CHANCE POPS FOR TONIGHT. STORMS SHOULD WEAKEN THIS EVENING. ANOTHER SHORTWAVE TRACKS THROUGH AGAIN ON TUESDAY. MOISTURE LIMITED AGAIN...SO ONLY WENT WITH 20/30 POPS FOR TUESDAY WITH THE BEST CHANCES IN THE MOUNTAINS. STAYED NEAR NGM/MET/MAV BLEND NUMBERS FOR TEMPERATURES. .LONG TERM...(TUESDAY NIGHT THROUGH MONDAY)...UPPER TROUGH WILL MOVE INTO THE NORTHEAST UNITED STATES BY THURSDAY. ASSOCIATED COLD FRONT WILL MOVE INTO THE TENNESSEE VALLEY AND SOUTHERN APPALACHIANS BY LATE THURSDAY-FRIDAY MORNING. GFS AND NAM SHOWS MOISTURE INCREASING OVER THE REGION WEDNESDAY AND THURSDAY WITH A SERIES OF WEAK SHORT-WAVES MOVING ACROSS THE REGION AS UPPER TROUGH DEVELOPS OVER THE NORTHEAST. WILL CALL FOR INCREASING CHANCES OF CONVECTION THROUGH THURSDAY. CAN NOT RULE OUT SOME SEVERE CONVECTION AS WELL DURING THE AFTERNOON-EVENING HOURS. FOR FRIDAY THROUGH MONDAY...FRONT MOVES SOUTH OF THE REGION WITH DRIER AIR PULLING INTO THE FORECAST AREA. EXTENDED MODELS ALSO SHOW UPPER RIDING STRENGTHENING AS WELL...SO HOT TEMPERATURES AND DRY WEATHER RETURNS. WILL TREND HIGHS TOWARD THE WARMER 12Z GFS MOS NUMBERS. && .PRELIMINARY POINT TEMPS/POPS... CHATTANOOGA AIRPORT, TN 72 94 73 91 72 / 20 20 30 40 40 KNOXVILLE MCGHEE TYSON AIRPORT, TN 69 92 71 88 70 / 20 20 20 50 50 OAK RIDGE, TN 69 92 71 88 70 / 20 20 20 50 40 TRI CITIES AIRPORT, TN 64 90 65 87 67 / 20 20 20 60 60 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && GH/DH
Hazardous weather outlook, Jul 28, 4:12 AM EDT, 15 hours 4 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 412 AM EDT MON JUL 28 2008 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-290815- 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- 412 AM EDT MON JUL 28 2008 /312 AM CDT MON JUL 28 2008/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SHOWERS AND THUNDERSTORMS SHOULD INCREASE IN COVERAGE LATE WEDNESDAY INTO THURSDAY. HOWEVER...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. TG
In the hours before
Special weather statement, Jul 28, 5:56 PM EDT, 1 hour 20 minutes before
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</html>Local storm report, Jul 28, 7:04 PM EDT, 12 minutes before
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</html>Special weather statement, Jul 28, 7:05 PM EDT, 11 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 28, 1:09 PM EDT | Severe Thunderstorm Warning | MRX | Morgan, Scott | 66 min |
| Jul 28, 4:00 PM EDT | Severe Thunderstorm Warning | MRX | Claiborne, Hancock | 60 min |
| Jul 28, 5:15 PM EDT | Areal Flood Advisory | MRX | Campbell, Claiborne | 3 hr |
| Jul 28, 6:00 PM EDT | Areal Flood Advisory | MRX | Carter, Johnson, Sullivan, Unicoi, Washington | 3 hr |
| Jul 28, 6:08 PM EDT | Severe Thunderstorm Warning | MRX | Loudon, Roane | 37 min |
| Jul 28, 6:30 PM EDT | Areal Flood Advisory | MRX | Morgan | 3 hr |
| Jul 28, 6:51 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Knox | 24 min |
| Jul 28, 6:58 PM EDT | Areal Flood Advisory | MRX | Anderson, Blount, Knox, Loudon, Roane | 3 hr |
| Jul 28, 4:22 PM EDT | Areal Flood Advisory | MRX | Lee, Scott, Wise | 113 min |
| Jul 28, 4:45 PM EDT | Severe Thunderstorm Warning | MRX | Russell, Washington, Wise | 60 min |
| Jul 28, 6:21 PM EDT | Areal Flood Advisory | MRX | Washington | 3 hr |
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.