Alert archive / Ohio / Mesoscale Discussions in 2005
Mesoscale Discussion 608
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2005, 3:05 PM EDT for 17 counties in Ohio; 5 counties in Pennsylvania. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2005, 3:05 PM EDT (19:05 UTC)
- Expired
- Apr 20, 2005, 4:30 PM EDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 22 counties
Ashtabula County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Cuyahoga County, OH, Geauga County, OH, Holmes County, OH, Lake County, OH, Lorain County, OH, Mahoning County, OH, Medina County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Wayne County, OH, Beaver County, PA, Crawford County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA
The radar
The Cleveland radar (KCLE), 65 km from the middle of the area, began a volume at 19:05 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, 7.1 hours before the alert went out and 126 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
- 1809 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- -62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 201905 SWOMCD SPC MCD 201905 PAZ000-WVZ000-OHZ000-202030- MESOSCALE DISCUSSION 0608 NWS STORM PREDICTION CENTER NORMAN OK 0205 PM CDT WED APR 20 2005 AREAS AFFECTED...NERN OH...NWRN PA CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 201905Z - 202030Z ...SEVERE THUNDERSTORM WATCH MAY BE REQUIRED FOR PORTIONS OF NERN OH AND NWRN PA... LEADING EDGE OF WARM ADVECTION CONVECTION HAS BEEN DISPLACED INTO CNTRL PORTIONS OF PA...WITH A NARROW AXIS OF INCREASING INSTABILITY IN THE WAKE OF THIS ACTIVITY ACROSS NERN OH INTO NWRN PA. IN THE LAST HOUR...THUNDERSTORMS HAVE RECENTLY DEVELOPED OVER LAKE ERIE AND WILL SOON MOVE ONSHORE INTO THIS ZONE OF INSTABILITY WHERE MORE THAN ADEQUATE DEEP LAYER FLOW WILL SUPPORT ISOLATED SEVERE MULTICELL UPDRAFTS. LARGE HAIL AND DAMAGING WINDS ARE THE PRIMARY THREATS. WW MAY BE REQUIRED. ..DARROW.. 04/20/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CTP...PBZ...CLE... 41498226 42158018 41527949 40598043 40188209
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 1:21 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Crawford, Darke, Hancock, Hardin and 9 more | 114 min |
| Apr 20, 1:50 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Ashland, Auglaize, Champaign, Crawford, Darke and 22 more | 6 hr |
| Apr 20, 3:35 PM EDT | Severe Thunderstorm Watch | SPC | Carroll, Columbiana, Coshocton, Geauga, Harrison, Holmes and 9 more | 4 hr |
| Apr 20, 4:19 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Auglaize, Crawford, Geauga, Hancock and 12 more | 86 min |
| Apr 20, 6:37 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Auglaize, Carroll, Champaign, Columbiana and 33 more | 83 min |
Nearby
Mesoscale Discussions in Ohio, 2005Mesoscale Discussions in Pennsylvania, 2005Every mesoscale discussion in 2005
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.