Alert archive / Virginia / Tornado Watches in 2015

Tornado Watch 276

June 8, 20154 states

The Storm Prediction Center issued this tornado watch at Jun 8, 2015, 2:34 PM EDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 8, 2015, 2:34 PM EDT (18:34 UTC)
Expired
Jun 8, 2015, 7:40 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 77 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Washington County, MD, Adams County, PA, Bedford County, PA, Blair County, PA, Centre County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, Augusta County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV

The radar

The State College radar (KCCX), 75 km from the middle of the area, began a volume at 18:37 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
30%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

36 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 8, 2:35 PM EDTSevere Thunderstorm WarningCTPCameron, Clinton, Lycoming, Potter, Tioga70 min
Jun 8, 2:42 PM EDTSevere Thunderstorm WarningCTPColumbia, Dauphin, Juniata, Mifflin, Montour, Northumberland and 4 more48 min
Jun 8, 2:44 PM EDTSevere Thunderstorm WarningCTPBedford, Blair, Cambria, Huntingdon, Somerset61 min
Jun 8, 3:00 PM EDTSevere Thunderstorm WarningLWXPage19 min
Jun 8, 3:13 PM EDTSevere Thunderstorm WarningLWXCulpeper, Madison, Page, Rappahannock47 min
Jun 8, 3:29 PM EDTTornado WarningCTPColumbia, Northumberland, Schuylkill61 min
Jun 8, 3:30 PM EDTTornado WarningCTPDauphin, Perry45 min
Jun 8, 3:42 PM EDTSevere Thunderstorm WarningCTPHuntingdon, Juniata, Mifflin, Snyder63 min
Jun 8, 3:46 PM EDTSevere Thunderstorm WarningLWXClarke, Frederick, City of Winchester44 min
Jun 8, 3:49 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Sullivan71 min
Jun 8, 3:56 PM EDTSevere Thunderstorm WarningLWXCulpeper, Rappahannock34 min
Jun 8, 4:06 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier39 min
Jun 8, 4:18 PM EDTSevere Thunderstorm WarningLWXWashington42 min
Jun 8, 4:18 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Franklin, Lebanon, Northumberland, Perry and 1 more72 min
Jun 8, 4:19 PM EDTFlash Flood WarningCTPDauphin, Juniata, Perry5 hr
Jun 8, 4:29 PM EDTSevere Thunderstorm WarningCTPSchuylkill46 min
Jun 8, 4:36 PM EDTSevere Thunderstorm WarningLWXFrederick, Washington24 min
Jun 8, 4:37 PM EDTSevere Thunderstorm WarningCTPSchuylkill38 min
Jun 8, 4:38 PM EDTSevere Thunderstorm WarningCTPColumbia25 min
Jun 8, 4:39 PM EDTSevere Thunderstorm WarningLWXFairfax, Fauquier, Prince William, City of Fairfax, City of Manassas, City of Manassas Park36 min
Jun 8, 5:06 PM EDTFlash Flood WarningCTPCumberland, Dauphin, Franklin, Perry3 hr
Jun 8, 5:08 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Lancaster, Lebanon, Schuylkill, York67 min
Jun 8, 5:12 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Franklin, York63 min
Jun 8, 5:15 PM EDTSevere Thunderstorm WarningLWXPage, Shenandoah30 min
Jun 8, 5:34 PM EDTSevere Thunderstorm WarningLWXPrince George's26 min
Jun 8, 5:44 PM EDTSevere Thunderstorm WarningLWXFauquier, Page, Rappahannock, Warren46 min
Jun 8, 5:51 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Frederick, Shenandoah, Warren39 min
Jun 8, 6:11 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, York79 min
Jun 8, 6:17 PM EDTSevere Thunderstorm WarningLWXFrederick, Montgomery, Washington28 min
Jun 8, 6:19 PM EDTSevere Thunderstorm WarningCTPAdams41 min
Jun 8, 6:25 PM EDTSevere Thunderstorm WarningLWXCarroll, Frederick50 min
Jun 8, 6:27 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Frederick, Loudoun, Shenandoah, Warren33 min
Jun 8, 6:43 PM EDTSevere Thunderstorm WarningLWXFairfax, Fauquier, Loudoun, Prince William, City of Fairfax32 min
Jun 8, 6:54 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll, Frederick, Howard51 min
Jun 8, 7:12 PM EDTSevere Thunderstorm WarningLWXMontgomery48 min
Jun 8, 7:28 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Harford, Howard, City of Baltimore62 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.6 hours before the alert went out and 150 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, Washington/Dulle, VA at 12:00Z on 2015-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Washington/Dulle, VA at 12:00Z on 2015-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 252 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1040 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
252 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

302 
WWUS20 KWNS 081823
SEL6  
SPC WW 081823
MDZ000-PAZ000-VAZ000-WVZ000-090000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 276
NWS STORM PREDICTION CENTER NORMAN OK
225 PM EDT MON JUN 8 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  MARYLAND PANHANDLE
  CENTRAL AND EASTERN PENNSYLVANIA
  NORTHWEST VIRGINIA
  EASTERN WEST VIRGINIA

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
  800 PM EDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

SUMMARY...SCATTERED STORMS WILL POSE A RISK FOR DAMAGING WINDS
AREA-WIDE. A COUPLE TORNADOES ARE POSSIBLE...PARTICULARLY ACROSS
PARTS OF CENTRAL/EASTERN PENNSYLVANIA.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHEAST OF
WILLIAMSPORT PENNSYLVANIA TO 20 MILES SOUTH OF STAUNTON VIRGINIA.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 274...WW 275...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24035.


...GRAMS/HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 8, 1:10 PM EDTMesoscale DiscussionSPCAllegany, Garrett2 hr
Jun 8, 1:31 PM EDTMesoscale DiscussionSPCWashington119 min
Jun 8, 2:40 PM EDTSevere Thunderstorm WatchSPCGarrett6 hr
Jun 8, 4:46 PM EDTMesoscale DiscussionSPCBaltimore, Carroll, Frederick, Harford, Howard, Montgomery and 3 more59 min
Jun 8, 7:07 PM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Carroll, Charles, Frederick, Harford and 4 more53 min
Jun 8, 7:24 PM EDTSevere Thunderstorm WatchSPCAnne Arundel, Baltimore, Carroll, Charles, Harford, Howard and 3 more2 hr
Jun 8, 1:39 PM EDTTornado WatchSPCBradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more6 hr
Jun 8, 2:58 PM EDTMesoscale DiscussionSPCBradford, Columbia, Lackawanna, Luzerne, Lycoming, Monroe and 6 more92 min
Jun 8, 3:20 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Centre, Chester and 25 more85 min
Jun 8, 4:13 PM EDTTornado WatchSPCBerks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more4 hr
Jun 8, 7:12 PM EDTMesoscale DiscussionSPCLackawanna, Luzerne, Pike, Wayne93 min
Jun 8, 1:08 PM EDTMesoscale DiscussionSPCLee97 min
Jun 8, 4:24 PM EDTMesoscale DiscussionSPCBland, Buchanan, Dickenson, Lee, Russell, Scott and 6 more96 min
Jun 8, 6:24 PM EDTMesoscale DiscussionSPCAmherst, Appomattox, Bedford, Bland, Buckingham, Campbell and 27 more96 min

Nearby

Tornado Watches in Virginia, 2015Tornado Watches in Pennsylvania, 2015Tornado Watches in Maryland, 2015Every tornado watch in 2015

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.