Alert archive / Virginia / Mesoscale Discussions in 2004
Mesoscale Discussion 902
The Storm Prediction Center issued this mesoscale discussion at May 25, 2004, 6:09 PM EDT for 6 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 25, 2004, 6:09 PM EDT (22:09 UTC)
- Expired
- May 25, 2004, 8:15 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 153 counties
New Castle County, DE, Allegany County, MD, 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, Frederick County, MD, Garrett 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, Talbot County, MD, Washington County, MD, Salem County, NJ, Adams County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Bucks County, PA, Cambria County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Montgomery County, PA, Perry County, PA, Philadelphia County, PA, Somerset County, PA, York County, PA, 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, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Carroll County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Danville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Galax, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Radford, VA, City of Richmond, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Craig County, VA, Culpeper County, VA, Cumberland 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, Goochland County, VA, Grayson County, VA, Greene County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Henry County, VA, Highland County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Loudoun County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, New Kent 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 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, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Wythe County, VA, Barbour County, WV, Berkeley County, WV, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mercer County, WV, Mineral County, WV, Monroe County, WV, Morgan County, WV, Pendleton County, WV, Pocahontas County, WV, Preston County, WV, Randolph County, WV, Summers County, WV, Tucker County, WV, Webster County, WV
The radar
The Sterling radar (KLWX), 74 km from the middle of the area, began a volume at 22:12 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 77 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
- 19 J/kg
- Mixed-layer CIN
- -224 J/kg
- Mixed-layer LCL
- 1534 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
365 ACUS11 KWNS 252209 SWOMCD SPC MCD 252209 NJZ000-PAZ000-DEZ000-MDZ000-VAZ000-DCZ000-WVZ000-NCZ000-TNZ000-260015- MESOSCALE DISCUSSION 0902 NWS STORM PREDICTION CENTER NORMAN OK 0509 PM CDT TUE MAY 25 2004 AREAS AFFECTED...S-CENTRAL/SERN PA...ERN WV PANHANDLE...MD...DC METRO...NRN/WRN VA CONCERNING...SEVERE THUNDERSTORM WATCH 287... VALID 252209Z - 260015Z CONTINUE WW. AT 2145Z...CLUSTERS OF SEVERE THUNDERSTORMS WERE LOCATED ACROSS S-CENTRAL PA/N-CENTRAL MD NEAR HGR...AND IN AN ARC FROM SHENANDOAH COUNTY VA SSWWD ALONG THE VA/WV BORDER. EMBEDDED CELLS WERE TRACKING GENERALLY ESEWD AT 20-25 KT. AIR MASS IN ADVANCE OF ONGOING ACTIVITY WILL REMAIN VERY UNSTABLE THROUGH THE NEXT FEW HOURS...WITH MID 60S TO NEAR 70 DEWPOINTS CONTRIBUTING TO MUCAPE VALUES OF 3000-4000 J/KG. MESOSCALE COLD POOL ASSOCIATED WITH SRN STORM CLUSTER SUGGESTS THAT THE THREAT FOR DAMAGING WINDS MAY INCREASE THIS EVENING ACROSS CENTRAL VA. FURTHER NORTH...SUPERCELL STORM NEAR WASHINGTON/FREDERICK COUNTY MD LINE WILL CONTINUE ESEWD WITH THREAT OF LARGE HAIL AND PERHAPS ISOLATED TORNADOES. AN ADDITIONAL WATCH MAY BE NEEDED EAST OF WW 287 FOR PORTIONS OF ERN MD AND THE DELMARVA PENINSULA WITHIN AN HOUR OR SO. ..BANACOS.. 05/25/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...PHI...AKQ...CTP...LWX...RAH...RNK...PBZ...RLX...MRX... 36507883 36528189 40597900 40577596 40437487 37827635
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 7:25 PM EDT | Severe Thunderstorm Watch | SPC | Kent, New Castle, Sussex | 4 hr |
| May 25, 2:58 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett, Washington | 92 min |
| May 25, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Carroll, Frederick, Garrett, Howard, Montgomery and 1 more | 6 hr |
| May 25, 12:54 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Crawford, Greene, Lawrence, Mercer and 1 more | 96 min |
| May 25, 1:30 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 6 more | 7 hr |
| May 25, 3:57 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 6 more | 63 min |
Nearby
Mesoscale Discussions in Virginia, 2004Mesoscale Discussions in Maryland, 2004Mesoscale Discussions in Pennsylvania, 2004Every mesoscale discussion in 2004
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.