Alert archive / Virginia / Mesoscale Discussions in 2003
Mesoscale Discussion 2425
The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2003, 6:52 PM EDT for 5 states. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Sep 27, 2003, 6:52 PM EDT (22:52 UTC)
- Expired
- Sep 27, 2003, 7:45 PM EDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 40 counties
Allegany County, MD, Washington County, MD, Cayuga County, NY, Ontario County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Wayne County, NY, Yates County, NY, Bedford County, PA, Blair County, PA, Centre County, PA, Clinton County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lycoming County, PA, Mifflin County, PA, Tioga County, PA, Amherst County, VA, Augusta County, VA, Bedford County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Frederick County, VA, Page County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Hampshire County, WV, Hardy County, WV, Morgan County, WV
The radar
The State College radar (KCCX), 94 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.9 hours before the alert went out and 152 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
- 24 J/kg
- Mixed-layer CIN
- -336 J/kg
- Mixed-layer LCL
- 757 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
308 ACUS11 KWNS 272252 SWOMCD SPC MCD 272252 NYZ000-PAZ000-MDZ000-WVZ000-VAZ000-272345- MESOSCALE DISCUSSION 2425 NWS STORM PREDICTION CENTER NORMAN OK 0552 PM CDT SAT SEP 27 2003 AREAS AFFECTED...WRN VA...NWD TO ERN LAKE ONTARIO CONCERNING...SEVERE THUNDERSTORM WATCH 935... VALID 272252Z - 272345Z LINEAR MCS IS PROGRESSING EWD AT ROUGHLY 15KT WHILE INDIVIDUAL CELLS ARE LIFTING NNEWD ALONG THE LINE AT ROUGHLY 25KT. AT TIMES A FEW STORMS HAVE EXHIBITED ROTATION...BUT MARGINAL INSTABILITY AND RELATIVELY SLOW STORM MOTION MAY ULTIMATELY INHIBIT MORE THAN ISOLATED DAMAGING WIND GUSTS. ..DARROW.. 09/27/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BGM...BUF...CTP...LWX...RNK... 37617992 39377894 40787822 43097733 43847681 43527635 40297737 37917878 37147957
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 27, 2:22 PM EDT | Mesoscale Discussion | SPC | Frederick, Washington | 113 min |
| Sep 27, 4:05 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Garrett, Washington | 5 hr |
| Sep 27, 1:58 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Cayuga, Erie, Genesee, Livingston and 9 more | 62 min |
| Sep 27, 2:35 AM EDT | Tornado Watch | SPC | Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 6 more | 5 hr |
| Sep 27, 6:39 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Chautauqua, Erie, Livingston, Wyoming | 96 min |
| Sep 27, 12:06 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Crawford, Lawrence and 3 more | 84 min |
| Sep 27, 12:40 AM EDT | Tornado Watch | SPC | Beaver, Butler, Crawford, Forest, Lawrence, Mercer and 2 more | 5 hr |
| Sep 27, 3:37 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more | 113 min |
| Sep 27, 5:15 AM EDT | Mesoscale Discussion | SPC | Beaver, Crawford, Lawrence, Mercer, Venango, Warren | 60 min |
| Sep 27, 11:42 AM EDT | Mesoscale Discussion | SPC | Dickenson, Lee, Russell, Scott, Wise, City of Norton | 108 min |
| Sep 27, 2:41 PM EDT | Mesoscale Discussion | SPC | Alleghany, Bedford, Bland, Botetourt, Carroll, Craig and 17 more | 2 hr |
Nearby
Mesoscale Discussions in Virginia, 2003Mesoscale Discussions in Pennsylvania, 2003Mesoscale Discussions in New York, 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.