Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 172, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jul 6, 2008, 5:04 AM EDT for Cocke County, Jefferson County, Sevier County, Tennessee. It was in force for 41 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 6, 2008, 5:04 AM EDT (09:04 UTC)
- Expired
- Jul 6, 2008, 5:45 AM EDT
- In force
- 41 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
Counties Cocke County, TN, Jefferson County, TN, Sevier County, TN
The radar
The Knoxville radar (KMRX), 28 km from the middle of the area, began a volume at 08:58 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 00:00Z, 9.1 hours before the alert went out and 292 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
- 55 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1699 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 53 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 6, 3:00 AM EDT, 2 hours 4 minutes earlier.
Area forecast discussion, Jul 6, 3:00 AM EDT, 2 hours 4 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 300 AM EDT SUN JUL 6 2008 .SHORT TERM (TODAY AND TONIGHT)...SURFACE FRONTAL BOUNDARY LOSES IDENTITY ACROSS CUMBERLAND PLATEAU THROUGH PERIOD. UPPER TROUGH WILL MOVE ESE INTO THE AREA TODAY AND TONIGHT. THUNDERSTORM CHANCE CONTINUES UNTIL TROUGH AXIS MOVES INTO THE MNTS TONIGHT. DRY AIR SWINGING THROUGH THE TROUGH BEGINNING TO WRAP INTO THE AREA. A FEW DOWNDRAFTS MAY BE ENHANCED BY EVAPORATION BUT SHOULD STAY BELOW SEVERE LIMITS. TEMPS NEAR CLIMO. .LONG TERM (MONDAY THROUGH SATURDAY)...OVERALL...MADE LITTLE CHANGE TO THE EXTENDED. A FEW SHOWERS/THUNDERSTORMS MAY LINGER OVER THE REGION ON MONDAY...MAINLY NORTH AND EAST LOCATIONS...AS AN UPPER TROUGH EXITS THE AREA. MODELS BRING IN A SURFACE BOUNDARY AROUND THE TUESDAY/WEDNESDAY TIME FRAME. MODEL HAVE BEEN IN POOR AGREEMENT WITH TIMING AND SOUTHERN PROGRESSION OF THE BOUNDARY SO CONFIDENCE LOW ON DETAILS...BUT HAVE KEPT BEST CHANCE OF PRECIP ON WEDNESDAY. BOUNDARY REMAINS IN THE REGION THURSDAY WITH A WEAK WAVE TRACKING ALONG IT. WILL SEE CONTINUED UNSETTLED CONDITIONS THROUGH THE REST OF THE EXTENDED AS A COUPLE OF WEAK SHORT WAVES MOVE THROUGH THE AREA. && .PRELIMINARY POINT TEMPS/POPS... CHATTANOOGA AIRPORT, TN 89 68 93 70 91 / 30 10 10 10 20 KNOXVILLE MCGHEE TYSON AIRPORT, TN 87 66 91 69 89 / 20 20 10 10 20 OAK RIDGE, TN 86 66 93 69 90 / 20 10 10 10 20 TRI CITIES AIRPORT, TN 84 63 88 64 88 / 30 20 20 10 30 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && SON/MJB
Hazardous weather outlook, Jul 5, 5:48 AM EDT, 23 hours 16 minutes before
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</html>In the hours before
Special weather statement, Jul 5, 11:32 PM EDT, 5 hours 32 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 1132 PM EDT SAT JUL 5 2008 NCZ060-061-060430- CHEROKEE-CLAY- 1132 PM EDT SAT JUL 5 2008 ...A STRONG THUNDERSTORM WILL BE AFFECTING CHEROKEE AND CLAY COUNTIES... AT 1130 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR MURPHY...MOVING EAST AT 15 MPH. SMALL HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM. IN ADDITION TO SMALL HAIL AND GUSTY WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES PRIMARY KILLERS. REMEMBER... IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. LOCALLY HEAVY RAINS...IN EXCESS OF ONE INCH PER HOUR...MAY OCCUR WITH THIS THUNDERSTORM. MOTORISTS SHOULD BE ALERT FOR PONDING OF WATER ON ROADWAYS...AND POSSIBLE MINOR FLOODING OF LOW LYING AREAS. DO NOT DRIVE THROUGH WATERS OF UNKNOWN DEPTH. TURN AROUND DONT DROWN DH
Special weather statement, Jul 6, 1:27 AM EDT, 3 hours 37 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 127 AM EDT SUN JUL 6 2008 TNZ099>102-060630- BRADLEY-EAST POLK-HAMILTON-WEST POLK- 127 AM EDT SUN JUL 6 2008 ...STRONG THUNDERSTORMS WILL BE AFFECTING BRADLEY...HAMILTON AND POLK COUNTIES... AT 124 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORMS NEAR CLEVELAND...MOVING EAST AT 20 MPH. PEA SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM. HEAVY DOWNPOURS OF RAIN WILL ALSO ACCOMPANY THESE STORMS. LOCALIZED SMALL STREAM AND URBAN FLOODING IS POSSIBLE. 17
The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 10:15 PM EDT | Severe Thunderstorm Warning | MRX | Claiborne | 36 min |
| Jul 6, 6:39 AM EDT | Areal Flood Advisory | MRX | Jefferson, Knox, Sevier | 66 min |
| Jul 6, 7:28 AM EDT | Flash Flood Warning | MRX | Jefferson, Knox, Sevier | 3 hr |
| Jul 6, 3:37 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Claiborne | 38 min |
| Jul 6, 7:50 PM EDT | Severe Thunderstorm Warning | MRX | Sullivan | 41 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.