Alert archive / Tennessee / Flash Flood Warnings in 2010

Flash Flood Warning 23, NWS Morristown, TN

November 30, 2010Morgan County, Tennessee

NWS Morristown, TN issued this flash flood warning at Nov 30, 2010, 8:39 AM EST for Morgan County, Tennessee. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Nov 30, 2010, 8:39 AM EST (13:39 UTC)
Expired
Nov 30, 2010, 12:30 PM EST
In force
4 hr
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Flood severity
None

County Morgan County, TN

The radar

The Knoxville radar (KMRX), 112 km from the middle of the area, began a volume at 13:39 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 12:00Z, 1.7 hours before the alert went out and 175 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, Nashville Metro, TN at 12:00Z on 2010-11-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 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, Nashville Metro, TN at 12:00Z on 2010-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -136 square meters per square second.1939587897117Sfc1 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
14 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
704 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
-136 m²/s²
0-3 km storm-relative helicity
-299 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Nov 30, 3:38 AM EST, 5 hours 1 minute earlier.

Area forecast discussion, Nov 30, 3:38 AM EST, 5 hours 1 minute 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>
Hazardous weather outlook, Nov 30, 4:16 AM EST, 4 hours 23 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
416 AM EST TUE NOV 30 2010

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-010930-
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-
416 AM EST TUE NOV 30 2010 /316 AM CST TUE NOV 30 2010/

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

.DAY ONE...TODAY AND TONIGHT

A POWERFUL STORM SYSTEM WILL BRING STRONG SOUTHEASTERLY WINDS ACROSS
THE HIGHER ELEVATIONS TONIGHT...WITH THESE HIGH WINDS ALSO AFFECTING
THE FOOTHILLS DUE TO MOUNTAIN WAVES. STRONG WINDS WILL ALSO BE
POSSIBLE ELSEWHERE AS SOME OF THE STRONGER SHOWERS PULL THESE
STRONG WINDS DOWN INTO THE VALLEY AREAS.

FOR FURTHER DETAILS...PLEASE SEE THE HIGH WIND WARNING AND WIND
ADVISORY PRODUCT (MEMNPWMRX).

ANOTHER CONCERN INVOLVES THE POSSIBILITY OF THUNDERSTORMS
DEVELOPING ACROSS SOUTHEAST TENNESSEE...SINCE THESE STORMS WILL
LIKELY ROTATE AND COULD PRODUCE ISOLATED TORNADOES... MAINLY OVER
SOUTHEAST TENNESSEE.

IN ADDITION TO THE STRONG WINDS...SOME AREAS COULD EXPERIENCE MINOR
FLOODING DUE TO LOCALLY HEAVY RAINFALL. TEMPERATURES WILL DROP
DRAMATICALLY TONIGHT...WITH ANY LINGERING RAIN SHOWERS CHANGING TO
SNOW SHOWERS ALONG WITH LIGHT ACCUMULATIONS ACROSS THE HIGHER
ELEVATIONS BY EARLY WEDNESDAY MORNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY FOR DAMAGING WIND
REPORTS...ESPECIALLY IN AND AROUND THE MOUNTAINS.

In the hours before

Special weather statement, Nov 30, 5:20 AM EST, 3 hours 19 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, Nov 30, 6:55 AM EST, 1 hour 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
655 AM EST TUE NOV 30 2010

TNZ098-301300-
MARION TN-
555 AM CST TUE NOV 30 2010

...SIGNIFICANT WEATHER ADVISORY FOR MARION COUNTY UNTIL 700 AM CST...

AT 548 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM TRACY CITY TO 19
MILES WEST OF BRIDGEPORT...AND MOVING EAST AT 40 MPH.

WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...JASPER...SOUTH
PITTSBURG...WHITWELL...ORME...GRIFFITH CREEK...MARTIN SPRINGS...
POWELLS CROSSROADS AND HALETOWN (GUILD).

17

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 30, 5:44 AM ESTAreal Flood AdvisoryMRXAnderson, Bledsoe, Bradley, Campbell, Hamilton, Loudon and 8 more4 hr
Nov 30, 9:37 AM ESTAreal Flood AdvisoryMRXAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 16 more4 hr
Nov 30, 11:18 AM ESTRiver Flood WarningMRXSevier17 hr
Nov 30, 2:50 PM ESTWind AdvisoryMRXBlount, Carter, Cocke, Greene, Johnson, McMinn and 5 more3 hr
Nov 30, 1:17 PM ESTAreal Flood AdvisoryMRXCherokee, Clay118 min

Nearby

Flash Flood Warnings in Tennessee, 2010Every flash flood warning in 2010

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.