Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 263, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jul 9, 2009, 5:14 PM EDT for Grainger County, Hamblen County, Jefferson County, Tennessee. It was in force for 61 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 9, 2009, 5:14 PM EDT (21:14 UTC)
- Expired
- Jul 9, 2009, 6:15 PM EDT
- In force
- 61 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
Counties Grainger County, TN, Hamblen County, TN, Jefferson County, TN
The radar
The Knoxville radar (KMRX), 2 km from the middle of the area, began a volume at 21:14 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
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.2 hours before the alert went out and 315 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
- 397 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
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 9, 3:29 PM EDT, 1 hour 45 minutes earlier.
Area forecast discussion, Jul 9, 3:29 PM EDT, 1 hour 45 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 329 PM EDT THU JUL 9 2009 .SHORT TERM (TONIGHT THROUGH SATURDAY)...SURFACE HIGH PRESSURE BUILDS IN FROM THE NORTHEAST THROUGH FRIDAY THEN RETREATS EAST SOME ON SATURDAY. EAST EDGE OF LARGE HIGH PRESSURE RIDGE ALOFT WILL WILL PRESS EAST INTO THE SOUTHERN APPALACHIANS THROUGH PERIOD. THICKNESS VALUES RISE INITIATING A MILD WARMING TREND. PW VALUES REMAIN NEAR 1.50 ON FRI WITH WEAK LOW LEVEL CONVERGENCE ALONG EDGE OF SURFACE RIDGE. SCATTERED...MAINLY AFTN OROGRAPHIC THUNDERSTORMS REMAIN POSSIBLE. HEAVY RAINERS WITH WEAK STEERING FLOW WHICH WILL HAVE MORE OF A NORTHERLY COMPONENT ON FRIDAY. ACTIVITY EXPECTED TO BE ISOLATED IN NATURE SATURDAY AND CONFINED TO THE EAST TN MOUNTAINS AND SW NC. .LONG TERM (SATURDAY NIGHT THROUGH THURSDAY)...A FRONT TRACKS INTO THE AREA ON SUNDAY AND LINGERS INTO TUESDAY. MODELS INDICATING AMPLE MOISTURE TO KEEP CHANCE POPS GOING FOR SUNDAY THROUGH TUESDAY. FRONT FINALLY EXITS THE AREA ON WEDNESDAY...BUT WITH STILL SOME LINGERING MOISTURE...WILL KEEP SLIGHT CHANCE POPS GOING FOR WEDNESDAY. GFS INDICATING THE FRONT RETURNS BACK INTO THE AREA ON THURSDAY. WITH STILL UNCERTAINTY ON TIMING AND POSITION....WILL KEEP THURSDAY DRY FOR NOW. STAYED NEAR MEX/HPC GUIDANCE FOR TEMPERATURES. && .PRELIMINARY POINT TEMPS/POPS... CHATTANOOGA AIRPORT, TN 68 90 70 91 68 / 10 10 0 10 10 KNOXVILLE MCGHEE TYSON AIRPORT, TN 66 87 66 88 68 / 10 10 0 10 10 OAK RIDGE, TN 66 88 67 90 68 / 10 10 0 10 20 TRI CITIES AIRPORT, TN 63 85 63 89 65 / 30 10 0 10 10 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && SON/GH
Hazardous weather outlook, Jul 9, 5:30 AM EDT, 11 hours 44 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 530 AM EDT THU JUL 9 2009 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-101000- 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- 530 AM EDT THU JUL 9 2009 /430 AM CDT THU JUL 9 2009/ 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...FRIDAY THROUGH WEDNESDAY ISOLATED STORMS WILL BE POSSIBLE EACH DAY AND MAY PRODUCE SOME CLOUD-TO-GROUND LIGHTNING STRIKES. THESE STORMS WILL BE MORE COMMON IN AND CLOSE TO THE MOUNTAINS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
In the hours before
Special weather statement, Jul 9, 1:43 PM EDT, 3 hours 31 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 143 PM EDT THU JUL 9 2009 TNZ035-036-091845- ANDERSON-MORGAN- 143 PM EDT THU JUL 9 2009 ...A STRONG THUNDERSTORM WAS AFFECTING ANDERSON AND MORGAN COUNTIES... AT 141 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6 MILES EAST OF WARTBURG. THIS STORM WAS NEARLY STATIONARY. PEA SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM. LOCALLY HEAVY RAINS...IN EXCESS OF ONE INCH PER HOUR...MAY OCCUR WITH THESE THUNDERSTORMS. 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 17
Special weather statement, Jul 9, 3:17 PM EDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 317 PM EDT THU JUL 9 2009 TNZ017-018-046-VAZ006-008-092015- JOHNSON-NORTHWEST CARTER-RUSSELL-SULLIVAN-WASHINGTON- 317 PM EDT THU JUL 9 2009 ...STRONG THUNDERSTORMS WERE AFFECTING CARTER...CITY OF BRISTOL...JOHNSON...RUSSELL...SULLIVAN AND WASHINGTON COUNTIES... AT 312 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG NEARLY STATIONARY THUNDERSTORMS OVER NORTHEAST TENNESSEE AND SOUTHWEST VIRGINIA. PEA SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM. LOCALLY HEAVY RAINS...IN EXCESS OF ONE AND ONE HALF INCH PER HOUR...MAY OCCUR WITH THESE THUNDERSTORMS. 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 17
Local storm report, Jul 9, 4:37 PM EDT, 37 minutes before
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</html>Special weather statement, Jul 9, 4:39 PM EDT, 35 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 9, 2:25 PM EDT | Areal Flood Advisory | MRX | Johnson | 3 hr |
| Jul 9, 3:43 PM EDT | Areal Flood Advisory | MRX | Carter, Sullivan, Washington | 3 hr |
| Jul 9, 4:02 PM EDT | Severe Thunderstorm Warning | MRX | Hawkins, Sullivan | 58 min |
| Jul 9, 5:02 PM EDT | Severe Thunderstorm Warning | MRX | Bradley, Hamilton | 58 min |
| Jul 9, 5:06 PM EDT | Areal Flood Advisory | MRX | Greene, Hawkins, Sullivan, Washington | 3 hr |
| Jul 9, 5:10 PM EDT | Severe Thunderstorm Warning | MRX | Greene, Hawkins | 65 min |
| Jul 9, 5:15 PM EDT | Areal Flood Advisory | MRX | Bradley, McMinn, Polk | 3 hr |
| Jul 9, 5:25 PM EDT | Severe Thunderstorm Warning | MRX | Unicoi, Washington | 65 min |
| Jul 9, 6:00 PM EDT | Areal Flood Advisory | MRX | McMinn, Monroe | 3 hr |
| Jul 9, 6:06 PM EDT | Areal Flood Advisory | MRX | Hawkins | 114 min |
| Jul 9, 6:13 PM EDT | Areal Flood Advisory | MRX | Grainger, Hamblen | 2 hr |
| Jul 9, 6:35 PM EDT | Severe Thunderstorm Warning | MRX | Cocke, Greene | 55 min |
| Jul 9, 6:57 PM EDT | Areal Flood Advisory | MRX | Greene | 2 hr |
| Jul 9, 5:24 PM EDT | Areal Flood Advisory | MRX | Scott | 3 hr |
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.