Alert archive / Virginia / Mesoscale Discussions in 2008
Mesoscale Discussion 2002
The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2008, 7:09 PM EDT for 4 states. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Aug 2, 2008, 7:09 PM EDT (23:09 UTC)
- Expired
- Aug 2, 2008, 8:45 PM EDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 151 counties
Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll 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, Adams County, PA, Lancaster County, PA, York County, PA, Accomack County, VA, Albemarle County, VA, Alleghany County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Brunswick County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Carroll County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Covington, VA, City of Danville, VA, City of Emporia, VA, City of Fairfax, VA, City of Falls Church, VA, City of Franklin, VA, City of Fredericksburg, VA, City of Galax, VA, City of Hampton, VA, City of Harrisonburg, VA, City of Hopewell, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Radford, VA, City of Richmond, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Waynesboro, VA, City of Williamsburg, VA, City of Winchester, VA, Clarke County, VA, Craig County, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Giles County, VA, Gloucester County, VA, Goochland County, VA, Grayson County, VA, Greene County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Henry County, VA, Highland 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, Loudoun County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, Montgomery County, VA, Nelson County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Page County, VA, Patrick County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Pulaski County, VA, Rappahannock County, VA, Richmond County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Smyth County, VA, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA, Tazewell County, VA, Warren County, VA, Westmoreland County, VA, Wythe County, VA, York County, VA, Grant County, WV, Hardy County, WV, Mercer County, WV, Monroe County, WV, Pendleton County, WV, Pocahontas County, WV
The radar
The Sterling radar (KLWX), 123 km from the middle of the area, began a volume at 23:11 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.2 hours before the alert went out and 123 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.
- Mixed-layer CAPE
- 17 J/kg
- Mixed-layer CIN
- -223 J/kg
- Mixed-layer LCL
- 1825 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 022309 SWOMCD SPC MCD 022309 DEZ000-MDZ000-VAZ000-PAZ000-NCZ000-DCZ000-WVZ000-030045- MESOSCALE DISCUSSION 2002 NWS STORM PREDICTION CENTER NORMAN OK 0609 PM CDT SAT AUG 02 2008 AREAS AFFECTED...PORTIONS ERN WV...VA...MD...DC. CONCERNING...SEVERE THUNDERSTORM WATCH 793...794... VALID 022309Z - 030045Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 793...794...CONTINUES. WWS ARE SCHEDULED TO EXPIRE AT 00Z. HOWEVER...SVR POTENTIAL OVER PORTIONS OF THIS REGION WILL CONTINUE FOR A FEW MORE HOURS THEREAFTER...AND ADDITIONAL WW ISSUANCE MAY BE NEEDED. PRIMARY AREAS OF CONCERN WILL BE THOSE THAT HAVE NOT BEEN STABILIZED SIGNIFICANTLY BY EARLIER ACTIVITY -- NAMELY PORTIONS SERN PA INTO CHESAPEAKE BAY REGION SWD TO SERN VA. AIR MASS ACROSS THIS AREA WILL REMAIN FAVORABLY UNSTABLE THROUGH EARLY EVENING...WITH SFC DEW POINTS UPPER 60S TO LOWER 70S F CONTRIBUTING TO MLCAPES GENERALLY IN 1000-2000 J/KG RANGE...AMIDST 30-40 KT EFFECTIVE SHEAR FAVORING ORGANIZED MULTICELLULAR TO BRIEFLY SUPERCELLULAR CONVECTIVE MODE...WITH SVR HAIL AND DAMAGING GUSTS POSSIBLE. CINH WILL INCREASE ACROSS THIS REGION AFTER 00Z...BUT GRADUALLY GIVEN RICHNESS OF SFC THETAE IN PRECONVECTIVE AIR MASS. COUNTERBALANCING FACTOR WITH REGARD TO CONVECTIVE COVERAGE WILL BE WEAKNESS IN LOW LEVEL CONVERGENCE AWAY FROM OUTFLOW AND SEA/BAY BREEZE BOUNDARIES...GIVEN PREDOMINANCE OF WLY COMPONENT TO SFC WINDS. FARTHER E...PER COORDINATION W/WFO-PHI...OLDER WW 791 HAS BEEN EXTENDED TO 00Z. FARTHER SW...POCKETS OF STABILIZED AIR ASTRIDE VA/NC BORDER AND PORTIONS N-CENTRAL/NWRN VA ARE LESS LIKELY TO RECOVER WITH TIME AS INSOLATION WEAKENS. WIDELY SCATTERED STG-SVR CONVECTION OVER MOUNTAINS OF WRN VA MAY MAINTAIN SOME SVR POTENTIAL FOR ANOTHER 1-2 HOURS...WHILE MOVING THROUGH MOIST AXIS ANALYZED INVOF I-81...THEN WEAKENING INTO MORE STABLE AIR MASS OVER SRN VA. ..EDWARDS.. 08/02/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...PHI...AKQ...CTP...LWX...RNK...PBZ...RLX...MRX... 36557647 36588163 37168170 37598110 37438082 37818033 38437999 39107931 39357693 39877740 40137594 38577611 38407501 37787555 37457569 37127591 36627588
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 10:39 AM EDT | Severe Thunderstorm Watch | SPC | Caroline, Cecil, Kent, Queen Anne's, Talbot | 9 hr |
| Aug 2, 1:18 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Charles and 15 more | 57 min |
| Aug 2, 1:56 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 9 more | 8 hr |
| Aug 2, 4:05 PM EDT | Severe Thunderstorm Watch | SPC | Dorchester, Somerset, Wicomico, Worcester | 6 hr |
| Aug 1, 10:56 PM EDT | Mesoscale Discussion | SPC | Crawford, Mercer | 94 min |
| Aug 2, 10:11 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Montgomery, Philadelphia | 94 min |
| Aug 2, 2:30 PM EDT | Mesoscale Discussion | SPC | Grayson | 90 min |
Nearby
Mesoscale Discussions in Virginia, 2008Mesoscale Discussions in Maryland, 2008Mesoscale Discussions in West Virginia, 2008Every mesoscale discussion in 2008
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.