Alert archive / Ohio / Mesoscale Discussions in 2024
Mesoscale Discussion 2021
The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2024, 8:39 PM EDT for Chautauqua County, New York; 14 counties in Ohio; 5 counties in Pennsylvania. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2024, 8:39 PM EDT (00:39 UTC)
- Expired
- Aug 27, 2024, 10:15 PM EDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 659
Counties Chautauqua County, NY, Ashland County, OH, Ashtabula County, OH, Crawford County, OH, Cuyahoga County, OH, Geauga County, OH, Huron County, OH, Lake County, OH, Mahoning County, OH, Medina County, OH, Portage County, OH, Richland County, OH, Summit County, OH, Trumbull County, OH, Wayne County, OH, Crawford County, PA, Erie County, PA, Mercer County, PA, Venango County, PA, Warren County, PA
The radar
The Cleveland radar (KCLE), 89 km from the middle of the area, began a volume at 00:38 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
Pittsburgh, PA (KPIT), launched 00:00Z, 0.7 hours before the alert went out and 139 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
- 340 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 2030 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The text
As transmitted.
691
ACUS11 KWNS 280040
SWOMCD
SPC MCD 280039
PAZ000-NYZ000-OHZ000-280215-
Mesoscale Discussion 2021
NWS Storm Prediction Center Norman OK
0739 PM CDT Tue Aug 27 2024
Areas affected...portions of far northern Ohio into extreme
northwestern Pennsylvania and extreme southwestern New York
Concerning...Severe Thunderstorm Watch 659...
Valid 280039Z - 280215Z
The severe weather threat for Severe Thunderstorm Watch 659
continues.
SUMMARY...Some severe threat will persist for a few more hours in
and immediately surrounding Severe Thunderstorm Watch 659. Damaging
gusts remain the primary concern.
DISCUSSION...A pronounced cold pool, originating from a mature
persistent elongated convective system, has surged southeastward
across Lake Erie over the past couple of hours. At least a few
severe gusts have been observed, and some convective rejuvenation
has occurred along the cold pool leading edge. Buoyancy
decreases/MLCINH increases with eastward and southward extent ahead
of the ongoing storms/cold pool. However, the fast pace of the cold
pool suggests that continued cellular regeneration and accompanying
damaging wind gust potential will continue for at least a couple
more hours.
..Squitieri.. 08/28/2024
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BUF...CTP...PBZ...CLE...
LAT...LON 40858328 41748140 42268059 42427980 42427919 42177908
41847921 41387970 41068055 40838138 40638224 40858328Nearby
Mesoscale Discussions in Ohio, 2024Mesoscale Discussions in Pennsylvania, 2024Mesoscale Discussions in New York, 2024Every mesoscale discussion in 2024
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.