Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 259, NWS Morristown, TN

July 5, 20094 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 5, 2009, 8:37 PM EDT for 4 counties in Tennessee. It was in force for 53 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 5, 2009, 8:37 PM EDT (00:37 UTC)
Expired
Jul 5, 2009, 9:30 PM EDT
In force
53 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon

Counties Bradley County, TN, Hamilton County, TN, McMinn County, TN, Meigs County, TN

The radar

The Northeast Alabama radar (KHTX), 119 km from the middle of the area, began a volume at 00:41 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.6 hours before the alert went out and 219 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.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2009-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1298 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2009-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1298 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
1080 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
180 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.3

Open this sounding in Storm Lab

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 5, 2:32 PM EDT, 6 hours 5 minutes earlier.

Area forecast discussion, Jul 5, 2:32 PM EDT, 6 hours 5 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
232 PM EDT SUN JUL 5 2009

.SHORT TERM (TONIGHT AND MONDAY)...
SHOWERS ARE DEVELOPING OVER MIDDLE TN IN ASSOCIATION WITH A PRE-
FRONTAL TROUGH. EXTRAOPLATION OF THESE SHOWERS BRINGS THEM INTO OUR
AREA BETWEEN 00Z AND MIDNIGHT. SO WILL HAVE LIKELY POPS IN THE
EVENING HOURS. NOT IMPRESSED WITH THE SEVERE THREAT FOR OUR AREA AS
OVERCAST CLOUDS ALL DAY WILL PREVENT MUCH DESTABILIZATION...AND
ORGANIZED UPPER DYNAMICS ARE LACKING. WILL ALSO JUST MENTION A
CHANCE OF THUNDERSTORMS. THE LOW WILL BE EAST OF THE AREA BY
MIDNIGHT...WITH A WEAK FRONT SLOWLY TRAILING BEHIND. SATELLITE
INDICATES PLENTY OF LOW CLOUDS BEHIND THE FRONT...BUT NOT MUCH
PRECIP. DRY AIR ALOFT WILL BE WORKING ITS WAY SOUTH LATE TONIGHT
AND TOMORROW. EXPECTED CONVECTION ALONG THE GULF COAST SHOULD
PREVENT NORTHWARD MOISTURE TRANSPORT AND FURTHER DECREASE OUR
PRECIP CHANCES. AS A RESULT...WENT WITH THE DRIER NAM FOR TOMORROW
AND WILL TAPER THE POPS BACK FROM NORTH TO SOUTH THROUGH THE
DAY...WITH JUST A SLIGHT CHANCE IN THE SOUTHERN VALLEY IN THE
AFTERNOON.

.LONG TERM (MONDAY NIGHT THROUGH SUNDAY)...
LATEST SHORT RANGE MODELS HAVE COLD FRONT JUST TO THE SOUTH OF THE
FORECAST AREA BY MONDAY EVENING WITH A FEW SHOWERS AND
THUNDERSTORMS LINGERING ACROSS THE SE MOUNTAINS. TUESDAY AND
TUESDAY NIGHT UPPER TROUGH LINGERS ACROSS THE NE STATES WITH NW
FLOW ACROSS THE TN VALLEY AND SOUTHERN APPALACHIANS. STILL ENOUGH
INSTABILITY FOR SOME SHOWERS AND THUNDERSTORMS ACROSS THE EASTERN
MOUNTAINS DURING PEAK HEATING HOURS SO LEFT SLIGHT CHANCE THERE.
WEDNESDAY LOOKS LIKE SHOWERS AND THUNDERSTORMS WILL STAY ON THE
EAST SIDE SO KEPT FORECAST DRY. HOWEVER TROUGH ACROSS NE BEGINS TO
MOVE EAST AND RIDGING OVER THE CENTRAL STATES EDGES EAST WARMING
THE ATMOSPHERE SO SLIGHTLY WARMER TEMPERATURES. THURSDAY GFS SHOWS
WEAK SYSTEM MOVING ACROSS OHIO VALLEY AND CLIPPING OUR NE AREA BUT
ECMWF DRY SO KEEPING FORECAST DRY FOR NOW. RIDGING MOVING IN FROM
THE WEST WILL KEEP TEMPERATURES WARMER AND AN INCREASE OF LOW LEVEL
MOISTURE BY FRIDAY KEEPS ISOLATED SHOWER AND THUNDERSTORM ACTIVITY
POSSIBLE IN THE HIGHER ELEVATIONS. A COLD FRONT MOVES INTO THE OHIO
VALLEY SATURDAY AND THEN POSSIBLY INTO THE FORECAST AREA BY LATE
SUNDAY. SHOULD HAVE AT LEAST A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS FROM SATURDAY AFTERNOON THROUGH SUNDAY. THE HIGHER
CHANCES WILL BE IN THE HIGHER ELEVATIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             70  84  66  90  64 /  70  30  10  10  10
KNOXVILLE MCGHEE TYSON AIRPORT, TN  68  84  62  88  63 /  70  20  10  10  10
OAK RIDGE, TN                       68  84  62  89  62 /  70  20  10  10  10
TRI CITIES AIRPORT, TN              65  82  59  86  57 /  70  10  10  10  10

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...NONE.
VA...NONE.

&&

DGS/TD
Hazardous weather outlook, Jul 5, 3:23 AM EDT, 17 hours 14 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
323 AM EDT SUN JUL 5 2009

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-060900-
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-
323 AM EDT SUN JUL 5 2009 /223 AM CDT SUN JUL 5 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH
CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT

A FRONTAL BOUNDARY WILL SAG SOUTH INTO THE AREA TODAY. SOME SHOWERS
AND THUNDERSTORMS CAN BE EXPECTED...AND A FEW OF THESE
THUNDERSTORMS MAY BECOME SEVERE...ESPECIALLY OVER SOUTHERN PARTS OF
THE AREA. DAMAGING WINDS AND LARGE HAIL WILL BE THE PRIMARY THREATS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

In the hours before

Special weather statement, Jul 5, 6:54 PM EDT, 1 hour 43 minutes before
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Special weather statement, Jul 5, 7:59 PM EDT, 38 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 8:18 PM EDTSevere Thunderstorm WarningMRXBlount, Loudon, McMinn, Monroe42 min
Jul 5, 9:14 PM EDTAreal Flood AdvisoryMRXBradley, Hamilton, Marion, Sequatchie3 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.