Alert archive / Ohio / Mesoscale Discussions in 2022

Mesoscale Discussion 852

May 21, 202213 counties in New York; 33 counties in Ohio; 7 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 21, 2022, 2:16 PM EDT for 13 counties in New York; 33 counties in Ohio; 7 counties in Pennsylvania. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 21, 2022, 2:16 PM EDT (18:16 UTC)
Expired
May 21, 2022, 4:45 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
60%
All 53 counties

Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Chautauqua County, NY, Livingston County, NY, Onondaga County, NY, Ontario County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Ashland County, OH, Ashtabula County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Fayette County, OH, Franklin County, OH, Geauga County, OH, Hancock County, OH, Hardin County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Portage County, OH, Richland County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Union County, OH, Wayne County, OH, Wyandot County, OH, Crawford County, PA, Erie County, PA, Forest County, PA, McKean County, PA, Mercer County, PA, Venango County, PA, Warren County, PA

The radar

The Pittsburgh radar (KPBZ), 141 km from the middle of the area, began a volume at 18:17 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, 6.3 hours before the alert went out and 153 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.

Skew-T log-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2022-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 820 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2022-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
820 J/kg
Mixed-layer CIN
-200 J/kg
Mixed-layer LCL
1222 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
165 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 21, 11:32 AM EDTMesoscale DiscussionSPCCayuga, Erie, Genesee, Jefferson, Lewis, Livingston and 7 more118 min
May 21, 2:47 PM EDTMesoscale DiscussionSPCClinton, Franklin, St. Lawrence118 min
May 21, 3:18 PM EDTSevere Thunderstorm WatchSPCClinton, Essex, Franklin, Hamilton, Herkimer, Jefferson and 7 more6 hr
May 21, 5:51 PM EDTMesoscale DiscussionSPCAllegany, Broome, Cattaraugus, Cayuga, Chemung, Chenango and 12 more114 min
May 21, 6:19 PM EDTSevere Thunderstorm WatchSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Chemung, Erie and 8 more5 hr
May 21, 1:00 PM EDTMesoscale DiscussionSPCAllen, Auglaize, Butler, Champaign, Clark, Clermont and 15 more2 hr
May 21, 1:51 PM EDTSevere Thunderstorm WatchSPCAllen, Auglaize, Butler, Clermont, Darke, Hamilton and 9 more7 hr
May 21, 2:47 PM EDTSevere Thunderstorm WatchSPCAdams, Ashland, Ashtabula, Brown, Carroll, Champaign and 48 more7 hr
May 21, 4:30 PM EDTMesoscale DiscussionSPCAdams, Allen, Ashland, Ashtabula, Athens, Auglaize and 67 more90 min

Nearby

Mesoscale Discussions in Ohio, 2022Mesoscale Discussions in New York, 2022Mesoscale Discussions in Pennsylvania, 2022Every mesoscale discussion in 2022

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.