Alert archive / Virginia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 49, NWS Morristown, TN

May 28, 2010Washington County, Virginia

NWS Morristown, TN issued this severe thunderstorm warning at May 28, 2010, 1:45 PM EDT for Washington County, Virginia. It was in force for 60 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: May 28, 2010, 1:45 PM EDT (17:45 UTC)
Expired: May 28, 2010, 2:45 PM EDT
In force: 60 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

County Washington County, VA

The radar

The Knoxville radar (KMRX), 143 km from the middle of the area, began a volume at 17:46 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, 5.8 hours before the alert went out and 198 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: 141 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 May 28, 9:50 AM EDT, 3 hours 55 minutes earlier.

Area forecast discussion, May 28, 9:50 AM EDT, 3 hours 55 minutes before

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Hazardous weather outlook, May 28, 8:50 AM EDT, 4 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE MORRISTOWN TN
850 AM EDT FRI MAY 28 2010

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-291000-
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-
850 AM EDT (750 AM CDT) FRI MAY 28 2010

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

.DAY ONE...TODAY AND TONIGHT

AN UPPER LEVEL DISTURBANCE WILL HELP TO TRIGGER NUMEROUS SHOWERS AND
THUNDERSTORMS TODAY...WITH SOME STORMS BECOMING STRONG TO SEVERE
THIS AFTERNOON AND EVENING. THE MAIN THREATS WITH THESE STORMS WILL
BE DAMAGING WINDS...LARGE HAIL...AND CLOUD TO GROUND LIGHTNING. IN
ADDITION...LOCALLY HEAVY RAINFALL WILL BE POSSIBLE DUE TO THE
EXPECTED SLOW MOVEMENT OF THESE STORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP EACH AFTERNOON AND
EVENING THROUGH NEXT WEEK...WITH A FEW ISOLATED STORMS POSSIBLY
BECOMING SEVERE EACH DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

DMG

In the hours before

Special weather statement, May 28, 1:37 PM EDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
137 PM EDT FRI MAY 28 2010

NCZ060-061-TNZ039>042-070>074-085>087-099>102-281815-
BLOUNT SMOKY MOUNTAINS TN-BRADLEY TN-CHEROKEE NC-CLAY NC-COCKE SMOKY
MOUNTAINS TN-EAST POLK TN-HAMBLEN TN-HAMILTON TN-JEFFERSON TN-MCMINN
TN-NORTH SEVIER TN-NORTHWEST COCKE TN-NORTHWEST GREENE TN-NORTHWEST
MONROE TN-NW BLOUNT TN-SEVIER SMOKY MOUNTAINS TN-SOUTHEAST MONROE
TN-WEST POLK TN-
137 PM EDT FRI MAY 28 2010

...SIGNIFICANT WEATHER ADVISORY FOR POLK...MONROE...EXTREME WESTERN
GREENE...SEVIER...COCKE...BLOUNT...JEFFERSON...BRADLEY...EXTREME
SOUTHERN HAMILTON...MCMINN...HAMBLEN...CLAY AND CHEROKEE COUNTIES
UNTIL 215 PM EDT...

AT 128 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM WATERVILLE TO
MCCAYSVILLE...AND MOVING NORTH AT 5 MPH.

PEA SIZE HAIL AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE
STORMS.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...DUCKTOWN...
GATLINBURG...NEWPORT...BENTON...SEVIERVILLE...DANDRIDGE...
PARROTTSVILLE...PIGEON FORGE...WHITE PINE...ETOWAH...ROUND
MOUNTAIN...HIAWASSE DAM...HARTFORD...UNAKA...VIOLET...COSBY...DEL
RIO...TURTLETOWN...PITTMAN CENTER AND ELKMONT.

17

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 11:46 AM EDT	Areal Flood Advisory	MRX	Monroe	119 min
May 28, 12:25 PM EDT	Flash Flood Warning	MRX	Monroe	3 hr
May 28, 1:10 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Unicoi, Washington	35 min
May 28, 1:50 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe, Polk	40 min
May 28, 2:19 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Jefferson	41 min
May 28, 2:27 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, Monroe	63 min
May 28, 2:30 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs, Polk	50 min
May 28, 2:39 PM EDT	Flash Flood Warning	MRX	Cocke	3 hr
May 28, 2:41 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox	49 min
May 28, 2:52 PM EDT	Areal Flood Advisory	MRX	Blount	3 hr
May 28, 2:56 PM EDT	Areal Flood Advisory	MRX	Johnson	3 hr
May 28, 2:56 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, McMinn, Meigs, Monroe, Roane	64 min
May 28, 2:58 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Greene, Hamblen, Hancock, Hawkins and 1 more	47 min
May 28, 3:43 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Loudon, Morgan, Roane	62 min
May 28, 3:47 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Grainger, Hamblen, Jefferson, Knox, Sevier	28 min
May 28, 4:18 PM EDT	Areal Flood Advisory	MRX	Roane	3 hr
May 28, 4:38 PM EDT	Areal Flood Advisory	MRX	Hawkins	3 hr
May 28, 4:43 PM EDT	Areal Flood Advisory	MRX	Grainger, Jefferson, Knox	3 hr
May 28, 4:43 PM EDT	Severe Thunderstorm Warning	MRX	Union	62 min
May 28, 4:59 PM EDT	Areal Flood Advisory	MRX	Anderson, Union	3 hr
May 28, 5:17 PM EDT	Areal Flood Advisory	MRX	Claiborne, Hancock	3 hr
May 28, 3:10 PM EDT	Areal Flood Advisory	MRX	Russell	3 hr
May 28, 3:11 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Washington	34 min
May 28, 4:10 PM EDT	Flash Flood Warning	MRX	Russell	3 hr
May 28, 4:18 PM EDT	Severe Thunderstorm Warning	MRX	Lee	27 min
May 28, 2:48 PM EDT	Areal Flood Advisory	MRX	Cherokee	3 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 2010 Every severe thunderstorm 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.