Alert archive / West Virginia / Mesoscale Discussions in 2004
Mesoscale Discussion 910
The Storm Prediction Center issued this mesoscale discussion at May 26, 2004, 12:55 PM EDT for Allegany County, Garrett County, Maryland; 29 counties in Pennsylvania; 32 counties in West Virginia. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2004, 12:55 PM EDT (16:55 UTC)
- Expired
- May 26, 2004, 2:30 PM EDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 63 counties
Allegany County, MD, Garrett County, MD, Allegheny County, PA, Armstrong County, PA, Bedford County, PA, Blair County, PA, Bradford County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Elk County, PA, Fayette County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lycoming County, PA, Mifflin County, PA, Potter County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Braxton County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Grant County, WV, Greenbrier County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Nicholas County, WV, Pleasants County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV
The radar
The Pittsburgh radar (KPBZ), 94 km from the middle of the area, began a volume at 16:56 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
Pittsburgh, PA (KPIT), launched 12:00Z, 4.9 hours before the alert went out and 78 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
- 372 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
005 ACUS11 KWNS 261655 SWOMCD SPC MCD 261655 PAZ000-MDZ000-WVZ000-VAZ000-OHZ000-261830- MESOSCALE DISCUSSION 0910 NWS STORM PREDICTION CENTER NORMAN OK 1155 AM CDT WED MAY 26 2004 AREAS AFFECTED...WRN/CNTRL PA SWD INTO WV/WRN MD CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 261655Z - 261830Z TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY THIS AFTERNOON AND CONVECTIVE TRENDS WILL BE MONITORED FOR POSSIBLE WW ISSUANCE. OVER THE PAST HALF HOUR...DEEPER CONVECTIVE ELEMENTS HAVE DEVELOPED OVER ARMSTRONG AND BUTLER COUNTIES OF WRN PA WITH ADDITIONAL MORE MATURE CONVECTIVE ACTIVITY FARTHER S OVER EXTREME SERN OH AND WRN WV. THOUGH HIGH-LEVEL CLOUDS HAVE SLOWED DAYTIME HEATING... MESOANALYSIS SHOWS TEMPERATURES WARMING THROUGH THE 70S AHEAD OF WEAK COLD FRONT/WIND SHIFT THAT EXTENDED FROM EXTREME PA INTO CNTRL OH AS OF 16Z. CONTINUED HEATING/MOISTENING OF PRE-FRONTAL AIRMASS WILL AID IN ADDITIONAL DESTABILIZATION THROUGH THE AFTERNOON HOURS WITH MLCAPES APPROACHING 1000-1500 J/KG. MOREOVER...INCREASED FORCING FOR ASCENT AHEAD OF SHORTWAVE TROUGH MOVING ACROSS SRN IL/IND SHOULD PROMOTE AN INCREASE IN STORM COVERAGE AND INTENSITY. RELATIVELY STRONG AND DEEP UNIDIRECTIONAL WIND FIELDS WILL SUPPORT ORGANIZED TSTMS CAPABLE OF ISOLATED LARGE HAIL AND DAMAGING WINDS. CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED AND A WW MAY BE REQUIRED IN THE NEXT COUPLE OF HOURS. ..MEAD.. 05/26/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BGM...CTP...LWX...RNK...PBZ...RLX... 39098162 41037968 41977833 41807614 40387730 38777935 37848050 38318219
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 9:50 PM EDT | Mesoscale Discussion | SPC | Calvert, Caroline, Dorchester, Queen Anne's, Saint Mary's, Somerset and 3 more | 55 min |
| May 26, 5:15 PM EDT | Mesoscale Discussion | SPC | Carroll | 2 hr |
| May 26, 5:45 PM EDT | Severe Thunderstorm Watch | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 11 more | 5 hr |
| May 26, 12:25 PM EDT | Severe Thunderstorm Watch | SPC | Mason | 7 hr |
| May 26, 1:38 PM EDT | Mesoscale Discussion | SPC | Boone, Braxton, Calhoun, Clay, Fayette, Gilmer and 23 more | 97 min |
| May 26, 2:18 PM EDT | Mesoscale Discussion | SPC | Mason | 87 min |
| May 26, 2:50 PM EDT | Severe Thunderstorm Watch | SPC | Barbour, Boone, Braxton, Cabell, Calhoun, Clay and 38 more | 7 hr |
Nearby
Mesoscale Discussions in West Virginia, 2004Mesoscale Discussions in Pennsylvania, 2004Mesoscale Discussions in Maryland, 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.