Alert archive / Virginia / Mesoscale Discussions in 2003
Mesoscale Discussion 1739
The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2003, 2:47 PM EDT for 10 counties in Maryland; 65 counties in Virginia; 20 counties in West Virginia. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Jul 9, 2003, 2:47 PM EDT (18:47 UTC)
- Expired
- Jul 9, 2003, 4:15 PM EDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 95 counties
Allegany County, MD, Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Washington County, MD, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, Campbell County, VA, Carroll County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Fairfax, VA, City of Falls Church, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Norton, VA, City of Radford, 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, Dickenson County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Giles County, VA, Greene County, VA, Highland County, VA, Lee County, VA, Loudoun County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Russell County, VA, Scott County, VA, Shenandoah County, VA, Smyth County, VA, Tazewell County, VA, Warren County, VA, Washington County, VA, Wise 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, McDowell 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, Wyoming County, WV
The radar
The Roanoke radar (KFCX), 78 km from the middle of the area, began a volume at 18:50 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
Roanoke, VA (KRNK), launched 12:00Z, 6.8 hours before the alert went out and 109 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
- 1142 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 646 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
933 ACUS11 KWNS 091847 SWOMCD SPC MCD 091847 MDZ000-DCZ000-VAZ000-WVZ000-KYZ000-TNZ000-092015- MESOSCALE DISCUSSION 1739 NWS STORM PREDICTION CENTER NORMAN OK 0147 PM CDT WED JUL 09 2003 AREAS AFFECTED...ERN WV...NRN AND WRN MD...NRN/WRN/SWRN VA CONCERNING...SEVERE THUNDERSTORM WATCH 695... VALID 091847Z - 092015Z ACROSS WW 695...AN ORGANIZED LINE OF THUNDERSTORMS EXTENDS AT 1835Z FROM THE NERN WV PANHANDLE SSWWD TO 10W ROA BEFORE ARCING WWD ACROSS FAR SWRN SECTIONS OF VA. STRONG COLD POOL IN ASSOCIATION WITH THIS LINE IN ADDITION TO MODERATE DEEP-LAYER WLY SHEAR SHOULD STEER THE LINE EWD AT 30-35KT. ENVIRONMENT REMAINS MODERATELY UNSTABLE IN ADVANCE OF ONGOING CONVECTION WITH 100MB MLCAPE VALUES OF 1000-1500 J/KG ACROSS WRN VA. EMBEDDED SMALL-SCALE BOWS WILL HAVE AN ENHANCED POTENTIAL FOR DAMAGING WIND GUSTS DURING THE NEXT FEW HOURS. ADDITION CONVECTION DEVELOPING IN LYH VICINITY MAY ALSO BECOME SEVERE DURING THE NEXT HOUR OR SO. AT THE SRN END OF THE CONVECTIVE LINE...STORMS HAVE ATTAINED AN E-W ORIENTATION ...RESULTING IN TRAINING ECHOES AND INCREASED HEAVY RAIN POTENTIAL ACROSS SCOTT...RUSSELL...WASHINGTON...AND SMYTH COUNTIES IN SWRN VA. SEVERE THUNDERSTORM POTENTIAL IN THIS AREA WILL LIKELY DECREASE IN FAVOR OF HEAVY RAINFALL...AND AN ADDITIONAL WATCH IS NOT ANTICIPATED IN ADJACENT AREAS OF FAR NERN TN/NRN NC. ISOLATED CONVECTION CONTINUES ACROSS N-CENTRAL SECTIONS OF VA. SEVERE THUNDERSTORM OVER LOUDOUN COUNTY VA WILL PASS NEAR DULLES AIRPORT AT 1915Z AND THE SOUTH SIDE OF WASHINGTON D.C. BETWEEN 1930Z AND 2000Z BASED ON PRESENT TRENDS. ..BANACOS.. 07/09/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...PHI...AKQ...LWX...RNK...PBZ...RLX...MRX...JKL... 36598343 37258260 37748128 39647956 39667592 38257773 36717967 36688162
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 8:12 PM EDT | Mesoscale Discussion | SPC | Allegany, Carroll, Frederick, Garrett, Howard, Montgomery and 1 more | 93 min |
| Jul 8, 8:30 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Frederick, Garrett, Washington | 4 hr |
| Jul 8, 11:16 PM EDT | Mesoscale Discussion | SPC | Allegany | 119 min |
| Jul 9, 10:28 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 9 more | 92 min |
| Jul 9, 11:50 AM EDT | Severe Thunderstorm Watch | SPC | Allegany, Anne Arundel, Baltimore, Carroll, Cecil, Frederick and 7 more | 6 hr |
| Jul 9, 12:09 PM EDT | Mesoscale Discussion | SPC | Calvert, Caroline, Charles, Dorchester, Kent, Queen Anne's and 5 more | 96 min |
| Jul 9, 1:15 PM EDT | Severe Thunderstorm Watch | SPC | Anne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 8 more | 8 hr |
| Jul 9, 3:48 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Calvert, Caroline, Charles, Dorchester, Kent and 7 more | 117 min |
| Jul 9, 7:36 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 8 more | 114 min |
| Jul 9, 12:55 PM EDT | Mesoscale Discussion | SPC | Wise | 3 hr |
Nearby
Mesoscale Discussions in Virginia, 2003Mesoscale Discussions in West Virginia, 2003Mesoscale Discussions in Maryland, 2003Every mesoscale discussion in 2003
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.