Alert archive / Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 1014

June 1, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2012, 6:54 PM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 1, 2012, 6:54 PM EDT (22:54 UTC)
Expired
Jun 1, 2012, 9:00 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 109 counties

Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Gates County, NC, Granville County, NC, Halifax County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Person County, NC, Vance County, NC, Warren County, NC, Berks County, PA, Chester County, PA, Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, York County, PA, Accomack County, VA, Amelia County, VA, Arlington County, VA, Brunswick County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Fairfax, VA, City of Falls Church, VA, City of Franklin, VA, City of Fredericksburg, VA, City of Hampton, VA, City of Hopewell, VA, City of Manassas, VA, City of Manassas Park, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Louisa County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Richmond County, VA, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA

The radar

The Dover AFB radar (KDOX), 112 km from the middle of the area, began a volume at 22:55 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.9 hours before the alert went out and 101 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, Wallops Is Stn, VA at 12:00Z on 2012-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 25 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, Wallops Is Stn, VA at 12:00Z on 2012-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
25 J/kg
Mixed-layer CIN
-145 J/kg
Mixed-layer LCL
1385 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
121 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.

802 
ACUS11 KWNS 012254
SWOMCD
SPC MCD 012254 
PAZ000-DEZ000-MDZ000-VAZ000-NCZ000-DCZ000-020100-

MESOSCALE DISCUSSION 1014
NWS STORM PREDICTION CENTER NORMAN OK
0554 PM CDT FRI JUN 01 2012

AREAS AFFECTED...NERN NC...ERN VA...MD...DE...SERN PA...NJ

CONCERNING...TORNADO WATCH 333...

VALID 012254Z - 020100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 333 CONTINUES.

SUMMARY...THE THREAT OF TORNADOES AND DAMAGING WINDS PERSIST OVER
THE AREA...AND A SEVERE THREAT MAY EXPAND NEWD INTO PORTIONS OF SERN
PA...DE AND CNTRL/SRN NJ.

DISCUSSION...RADAR CONTINUES TO SHOW SUPERCELLS OVER VA AND
MD...WITH NOTABLE CIRCULATIONS NOW ENTERING KING GEORGE COUNTY AND
FARTHER S INTO HANOVER COUNTY. SUFFICIENT INSTABILITY AND FAVORABLE
WIND PROFILES FOR SUPERCELLS AND TORNADOES REMAIN...AND A NEW WATCH
WILL REPLACE #333 PRIOR TO THE SCHEDULED 0100Z EXPIRATION.

..JEWELL.. 06/01/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...PHI...AKQ...MHX...CTP...LWX...RAH...RNK...

LAT...LON   39467737 40587681 40677580 40487554 40157569 39477570
            38487563 38447507 37917522 37487541 36747584 36257595
            36007684 36037745 36197925 36207935 39467737

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 1, 12:29 PM EDTMesoscale DiscussionSPCAnne Arundel, Calvert, Carroll, Charles, Frederick, Howard and 5 more61 min
Jun 1, 1:03 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 11 more87 min
Jun 1, 1:28 PM EDTTornado WatchSPCAllegany, Frederick, Garrett, Washington8 hr
Jun 1, 1:50 PM EDTTornado WatchSPCAnne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 13 more7 hr
Jun 1, 3:35 PM EDTMesoscale DiscussionSPCAllegany, Frederick, Garrett, Washington55 min
Jun 1, 3:49 PM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 11 more56 min
Jun 1, 1:54 PM EDTMesoscale DiscussionSPCAnson, Bladen, Brunswick, Chatham, Columbus, Craven and 23 more66 min
Jun 1, 2:13 PM EDTSevere Thunderstorm WatchSPCAlamance, Anson, Beaufort, Bladen, Brunswick, Carteret and 41 more8 hr
Jun 1, 4:31 PM EDTMesoscale DiscussionSPCAlamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 44 more59 min
Jun 1, 7:42 PM EDTMesoscale DiscussionSPCAlamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 40 more2 hr
Jun 1, 4:25 PM EDTMesoscale DiscussionSPCBerks, Chester, Delaware, Montgomery, Philadelphia65 min
Jun 1, 5:46 PM EDTMesoscale DiscussionSPCCameron, Centre, Clearfield, Clinton, Elk, Forest and 10 more89 min
Jun 1, 6:04 PM EDTTornado WatchSPCCameron, Centre, Clearfield, Clinton, Columbia, Elk and 10 more5 hr

Nearby

Mesoscale Discussions in Virginia, 2012Mesoscale Discussions in Maryland, 2012Mesoscale Discussions in North Carolina, 2012Every mesoscale discussion 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.