Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 57, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Apr 13, 2009, 9:51 PM CDT for Marion County, Tennessee. It was in force for 54 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
- Apr 13, 2009, 9:51 PM CDT (02:51 UTC)
- Expired
- Apr 13, 2009, 10:45 PM CDT
- In force
- 54 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 02:51 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, 2.9 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
- 703 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 752 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.5
- 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 Apr 13, 8:00 PM CDT, 1 hour 51 minutes earlier.
Area forecast discussion, Apr 13, 8:00 PM CDT, 1 hour 51 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 900 PM EDT MON APR 13 2009 .DISCUSSION... CURRENT SURFACE ANALYSIS SHOWS AN AREA OF LOW PRESSURE CENTERED OVER THE MID WEST...WITH A COLD FRONT EXTENDING SOUTH OF IT ACROSS MIDDLE TN. AREA RADARS REVEAL SCATTERED CONVECTION OCCURRING OVER MIDDLE TN AND NORTHERN AL AHEAD OF THIS COLD FRONT...WITH ONLY A FEW SHOWERS OVER THE FORECAST AREA. COVERAGE OF CONVECTION SHOULD INCREASE OVER THE FORECAST AREA LATER TONIGHT...AS THIS COLD FRONT SLOWLY MOVES ACROSS THE TN RIVER VALLEY. MODELS INDICATE THAT SOME MARGINAL INSTABILITY WILL LINGER ACROSS THE SOUTHERN HALF OF THE FORECAST AREA OVERNIGHT...SO WILL INCREASE THE MENTION OF TSTORMS IN THE SOUTHERN ZONES. OTHERWISE...CURRENT FORECAST APPEARS TO BE ON TRACK...BUT WILL PLAN TO UPDATE THIS EVENING TO TWEAK PRECIP WORDING A LITTLE. && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && DMG
Hazardous weather outlook, Apr 13, 8:10 PM CDT, 1 hour 41 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 910 PM EDT MON APR 13 2009 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-141000- 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- 910 PM EDT (810 PM CDT) MON APR 13 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST TENNESSEE...SOUTHWEST VIRGINIA AND EXTREME SOUTHWEST NORTH CAROLINA. .DAY ONE...TODAY AND TONIGHT A COLD FRONT WILL SLOWLY MOVE ACROSS THE TENNESSEE RIVER VALLEY TONIGHT...WITH SCATTERED SHOWERS AND THUNDERSTORMS OCCURRING AHEAD OF IT. A FEW ISOLATED STORMS MAY BECOME SEVERE OVERNIGHT...BRINGING THE POSSIBILITY OF DAMAGING WINDS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED DUE TO THE ISOLATED NATURE OF THE SEVERE THREAT.
In the hours before
Special weather statement, Apr 13, 5:03 PM CDT, 4 hours 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 603 PM EDT MON APR 13 2009 TNZ098-132300- MARION- 503 PM CDT MON APR 13 2009 ...A STRONG THUNDERSTORM WILL AFFECT MARION COUNTY THROUGH 6 PM CDT... AT 500 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6 MILES SOUTH OF SEWANEE...MOVING EAST AT 30 MPH. THIS STORM WILL BE NEAR... JASPER BY 535 PM CDT. GUSTY WINDS UP TO 40 MPH AND SMALL HAIL WILL BE POSSIBLE WITH THIS STORM. IN ADDITION TO SMALL HAIL AND GUSTY WINDS...OCCASIONAL 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. DMG
Special weather statement, Apr 13, 5:19 PM CDT, 4 hours 32 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 619 PM EDT MON APR 13 2009 TNZ082-083-132315- BLEDSOE-RHEA- 519 PM CDT MON APR 13 2009 ...STRONG THUNDERSTORMS WILL AFFECT BLEDSOE AND RHEA COUNTIES... AT 516 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A LINE OF STRONG THUNDERSTORMS NEAR SPENCER...MOVING EAST AT 25 MPH. THESE STORMS WILL BE NEAR... PIKEVILLE BY 550 PM CDT. WINDS UP TO 40 MPH AND SMALL HAIL WILL BE POSSIBLE WITH THESE STORMS. IN ADDITION TO SMALL HAIL AND GUSTY WINDS...OCCASIONAL 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. DMG
Special weather statement, Apr 13, 5:59 PM CDT, 3 hours 52 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 659 PM EDT MON APR 13 2009 TNZ081-098-099-140000- HAMILTON-MARION-SEQUATCHIE- 659 PM EDT MON APR 13 2009 ...STRONG THUNDERSTORMS WILL AFFECT HAMILTON...MARION AND SEQUATCHIE COUNTIES... AT 557 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR WHITWELL...MOVING EAST AT 25 MPH. THIS STORM WILL BE NEAR... SIGNAL MOUNTAIN BY 725 PM EDT. SODDY-DAISY BY 750 PM EDT. SMALL HAIL AND GUSTY WINDS UP TO 40 MPH WILL BE POSSIBLE WITH THIS STORM. IN ADDITION TO SMALL HAIL AND GUSTY WINDS...OCCASIONAL 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. DMG
Special weather statement, Apr 13, 6:57 PM CDT, 2 hours 54 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 |
|---|---|---|---|---|
| Apr 13, 9:28 PM CDT | Tornado Warning | MRX | Sequatchie | 27 min |
| Apr 13, 10:09 PM CDT | Severe Thunderstorm Warning | MRX | Sequatchie | 51 min |
| Apr 13, 10:26 PM CDT | Severe Thunderstorm Warning | MRX | Marion | 39 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.