Alert archive / Pennsylvania / Mesoscale Discussions in 2004
Mesoscale Discussion 1413
The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2004, 7:44 PM EDT for Belmont County, Jefferson County, Ohio; 20 counties in Pennsylvania; Brooke County, Hancock County, Ohio County, West Virginia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2004, 7:44 PM EDT (23:44 UTC)
- Expired
- Jun 24, 2004, 9:45 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 25 counties
Belmont County, OH, Jefferson County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Clarion County, PA, Clearfield County, PA, Crawford County, PA, Elk County, PA, Forest County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Ohio County, WV
The radar
The Pittsburgh radar (KPBZ), 31 km from the middle of the area, began a volume at 23:45 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, 11.7 hours before the alert went out and 40 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1552 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
016 ACUS11 KWNS 242345 SWOMCD SPC MCD 242344 PAZ000-NYZ000-WVZ000-OHZ000-250145- MESOSCALE DISCUSSION 1413 NWS STORM PREDICTION CENTER NORMAN OK 0644 PM CDT THU JUN 24 2004 AREAS AFFECTED...EXTREME WRN NY STATE..WRN AND CENTRAL PA...E CENTRAL OH AND THE NRN WV PANHANDLE CONCERNING...SEVERE THUNDERSTORM WATCH 519... VALID 242344Z - 250145Z SQUALL LINE CONTINUE TO PROGRESS EWD ACROSS NERN OH AT 30-40 KT. WE ARE MONITORING THIS AREA FOR AN ADDITIONAL WW WITHIN THE NEXT HOUR. SQUALL LINE HAS A HISTORY OF DAMAGING WINDS AND SOME HAIL AS IT MOVED ACROSS NERN AND N CENTRAL OH. MLCAPE VALUES ARE RUNNING BETWEEN 1000 AND 1500 J/KG AHEAD OF THE LINE. MAIN ADVANCEMENT OF THE STRONG COLD FRONT IS EWD ACROSS NERN OH INTO NWRN PA AND WRN NY WHICH WOULD PLACE THE LEADING ACTIVITY INTO THIS AREA WITHIN THE NEXT HOUR OR SO. SURFACE TEMPS IN THE MID 70S TO LOWER 80S..AND DEW POINTS IN THE LOW 60S AHEAD OF THE FRONT CONTINUE TO BE FAVORABLE TO SUPPORT STRONG/SEVERE STORMS THE NEXT FEW HOURS. LOSS OF DAYTIME HEATING WILL DECREASE POTENTIAL INSTABILITY...BUT WITH ADVANCING COLD FRONT...DAMAGING WINDS WILL REMAIN A CONCERN ACROSS THIS REGION. ..MCCARTHY.. 06/24/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BUF...CTP...PBZ...CLE... 39988140 40258110 40938060 41848025 42327930 41997810 41047794 40317894 39898004 39848111
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 3:11 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Ashtabula, Auglaize, Champaign, Clark and 34 more | 94 min |
| Jun 24, 4:05 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Ashland, Auglaize, Carroll, Champaign, Clark and 35 more | 6 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2004Mesoscale Discussions in West Virginia, 2004Mesoscale Discussions in Ohio, 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.