Alert archive / Ohio / Mesoscale Discussions in 2004
Mesoscale Discussion 813
The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 2:25 AM EDT for 39 counties in Ohio; 16 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 22, 2004, 2:25 AM EDT (06:25 UTC)
- Expired
- May 22, 2004, 4:30 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 59 counties
Ashland County, OH, Ashtabula County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Erie County, OH, Geauga County, OH, Guernsey County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Muskingum County, OH, Portage County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Wayne County, OH, Wyandot County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Crawford County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV
The radar
The Cleveland radar (KCLE), 67 km from the middle of the area, began a volume at 06:28 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
Cncnati-Daytn, OH (KILN), launched 00:00Z, 6.4 hours before the alert went out and 249 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
- 2621 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 832 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.0
The text
As transmitted, in the capitals the NWS used until 2016.
886 ACUS11 KWNS 220626 SWOMCD SPC MCD 220625 PAZ000-WVZ000-OHZ000-220830- MESOSCALE DISCUSSION 0813 NWS STORM PREDICTION CENTER NORMAN OK 0125 AM CDT SAT MAY 22 2004 AREAS AFFECTED...NRN-ERN OH/WRN PA CONCERNING...SEVERE THUNDERSTORM POTENTIAL...HEAVY RAINFALL VALID 220625Z - 220830Z ELEVATED STORMS WILL CONTINUE TO DEVELOP ACROSS NRN OH/LAKE ERIE INTO WRN PA THE NEXT SEVERAL HOURS. PRIMARY THREAT WITH THIS ACTIVITY WILL BE ISOLATED HAIL. WV IMAGERY INDICATED A SHORT WAVE TROUGH OVER SRN LAKE HURON AND TRAILING SWWD TO NERN IL AT 05Z. 45 KT WLY MID-LEVEL WIND ON THE SRN PERIPHERY OF THIS FEATURE WILL PROVIDE SUFFICIENT DEEP LAYER SHEAR FOR ORGANIZED STORMS. AIR MASS ALONG AND S OF THE WNW-ESE ORIENTED OUTFLOW BOUNDARY...WHICH EXTENDED FROM CENTRAL IA ESEWD ACROSS NRN IL/IND INTO CENTRAL OH...IS CHARACTERIZED BY MUCAPE VALUES RANGING FROM 1500-2000 J/KG. AREA VAD WIND DATA/RUC OBJECTIVE ANALYSIS INDICATED A 30 KT SWLY LLJ IMPINGING ON THE BOUNDARY FROM NRN IND TO NRN OH WHICH WILL CONTINUE TO SUPPORT LOW-LEVEL CONVERGENCE/ASCENT...AND A MOIST/UNSTABLE INFLUX FOR CONVECTIVE DEVELOPMENT OVERNIGHT. LARGE SCALE ASCENT WITH THE SHORT WAVE TROUGH WILL AID IN SUSTAINING A BROAD AREA OF CONVECTION...WITH STEEP LAPSE RATES FAVORING A HAIL THREAT WITH THESE ELEVATED STORMS. ALTHOUGH STORMS WILL CONTINUE TO MOVE ESEWD OVERNIGHT AS THE TROUGH MOVES TOWARD THE LOWER GREAT LAKES...VEERING LLJ TO NEARLY PARALLEL TO LINE OF STORMS WILL FAVOR BACKBUILDING ALONG THE WRN EDGE OVER CENTRAL/ERN OH AND TRAINING OF STORMS INTO ERN OH/WRN PA FOR A HEAVY RAIN THREAT. ..PETERS.. 05/22/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CTP...PBZ...RLX...CLE...ILN...IWX... 41498289 42028082 41767926 40827885 39877935 39788082 39788264 40438390 41158397
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 2:48 AM EDT | Mesoscale Discussion | SPC | Defiance, Erie, Fulton, Hancock, Henry, Huron and 8 more | 57 min |
| May 22, 12:35 PM EDT | Severe Thunderstorm Watch | SPC | Defiance, Williams | 6 hr |
| May 22, 1:26 PM EDT | Mesoscale Discussion | SPC | Trumbull | 94 min |
| May 22, 3:36 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Auglaize, Champaign, Coshocton, Crawford and 36 more | 54 min |
| May 22, 4:20 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Ashland, Ashtabula, Auglaize, Champaign, Coshocton and 36 more | 8 hr |
| May 22, 6:29 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Ashtabula, Auglaize, Champaign, Coshocton and 35 more | 91 min |
| May 22, 5:23 PM EDT | Mesoscale Discussion | SPC | Bradford, Forest, McKean, Potter, Susquehanna, Tioga and 2 more | 97 min |
| May 22, 5:45 PM EDT | Tornado Watch | SPC | Armstrong, Beaver, Bradford, Butler, Cameron, Clarion and 16 more | 5 hr |
| May 21, 9:34 PM EDT | Mesoscale Discussion | SPC | Greenbrier, Mercer, Monroe, Raleigh, Summers | 86 min |
Nearby
Mesoscale Discussions in Ohio, 2004Mesoscale Discussions in Pennsylvania, 2004Mesoscale Discussions in West Virginia, 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.