Alert archive / Tennessee / Areal Flood Warnings in 2012

Areal Flood Warning 2, NWS Morristown, TN

August 6, 2012Washington County, Tennessee

NWS Morristown, TN issued this areal flood warning at Aug 6, 2012, 3:15 AM EDT for Washington County, Tennessee. It was in force for 6 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: Aug 6, 2012, 3:15 AM EDT (07:15 UTC)
Expired: Aug 6, 2012, 9:15 AM EDT
In force: 6 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

County Washington County, TN

The radar

The Knoxville radar (KMRX), 82 km from the middle of the area, began a volume at 07:14 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 00:00Z, 7.3 hours before the alert went out and 234 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 286 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1128 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 38 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 areal 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 areal flood warning went out at Aug 6, 1:35 AM EDT, 1 hour 40 minutes earlier.

Area forecast discussion, Aug 6, 1:35 AM EDT, 1 hour 40 minutes before

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Hazardous weather outlook, Aug 5, 4:36 AM EDT, 22 hours 39 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
436 AM EDT SUN AUG 5 2012

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-060845-
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-
436 AM EDT SUN AUG 5 2012 /336 AM CDT SUN AUG 5 2012/

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

.DAY ONE...TODAY AND TONIGHT...

A COLD FRONT WILL MOVE TOWARD THE AREA WITH CONTINUED MOIST AND
UNSTABLE AIR IN PLACE. AS THE FRONT APPROACHES THE TENNESSEE VALLEY
DURING THE LATE AFTERNOON AND EVENING...SOME OF THESE STORMS MAY
BECOME SEVERE. THE MAIN THREATS BEING DAMAGING WINDS...HAIL UP TO
QUARTER SIZE AND HEAVY RAINS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THE COLD FRONT IS EXPECTED TO STALL IN OR NEAR THE TENNESSEE VALLEY
MONDAY...WITH AT LEAST A FEW STRONG STORMS POSSIBLE.

MOIST AND UNSTABLE AIR IS LIKELY TO HANG AROUND INTO NEXT
WEEK...SO STRONG STORMS ARE CERTAINLY POSSIBLE EACH DAY. GUSTY
WINDS IN EXCESS OF 45 MPH...SMALL HAIL AND TORRENTIAL RAINFALL WILL
BE POSSIBLE WITH THE STRONGEST STORMS...ESPECIALLY IN THE AFTERNOON
AND EVENING HOURS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

TG

In the hours before

Local storm report, Aug 5, 11:42 PM EDT, 3 hours 33 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MORRISTOWN TN
1142 PM EDT SUN AUG 05 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0640 PM     FLASH FLOOD      WALLAND                 35.73N 83.82W
08/05/2012                   BLOUNT             TN   911 CALL CENTER

            MUDSLIDE ON OLD WALLAND HIGHWAY.

0640 PM     FLASH FLOOD      3 NW WALLAND            35.76N 83.85W
08/05/2012                   BLOUNT             TN   911 CALL CENTER

            SEVERAL ROADS IMPASSABLE.

0655 PM     FLASH FLOOD      ERWIN                   36.14N 82.41W
08/05/2012                   UNICOI             TN   911 CALL CENTER

            PORTIONS OF HIGHWAY 81 CLOSED.

0700 PM     FLASH FLOOD      JOHNSON CITY            36.33N 82.37W
08/05/2012                   WASHINGTON         TN   EMERGENCY MNGR

            STATE OF FRANKLIN ROAD AT DIVISION STREET IS IMPASSABLE.
            INTERSECTION OF LEGION STREET AT STATE OF FRANKLLIN IS
            UNDER WATER. JOHNSON CITY DOWNTOWN IS EXPERIENCING
            FLOODING.

0810 PM     FLASH FLOOD      ELIZABETHTON            36.34N 82.23W
08/05/2012                   CARTER             TN   911 CALL CENTER

            ROADS CLOSED IN ELIZABETHTON AND FLOODING REPORTED COUNTY
            WIDE.

&&

JWINTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 9:15 PM EDT	Areal Flood Warning	MRX	Carter, Unicoi, Washington	6 hr
Aug 6, 4:27 AM EDT	Flood Watch	MRX	Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 15 more	11 hr
Aug 6, 2:35 PM EDT	Areal Flood Advisory	MRX	Monroe	83 min
Aug 6, 3:19 PM EDT	Flood Watch	MRX	Anderson, Blount, Carter, Cocke, Grainger, Greene and 11 more	5 hr

Nearby

Areal Flood Warnings in Tennessee, 2012 Every areal flood warning in 2012

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.