Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 259, NWS Morristown, TN
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.
- 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
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
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Special weather statement, Jul 5, 7:59 PM EDT, 38 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 8:18 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Loudon, McMinn, Monroe | 42 min |
| Jul 5, 9:14 PM EDT | Areal Flood Advisory | MRX | Bradley, Hamilton, Marion, Sequatchie | 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.