Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 975

May 26, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 26, 2011, 2:37 AM EDT for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 26, 2011, 2:37 AM EDT (06:37 UTC)
Expired
May 26, 2011, 4:00 AM EDT
In force
83 min
Issued by
the Storm Prediction Center
All 37 counties

Monroe County, MI, Ashland County, OH, Ashtabula County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Mahoning County, OH, Medina County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Ottawa 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, Wayne County, OH, Beaver County, PA, Lawrence County, PA, Hancock County, WV

The radar

The Cleveland radar (KCLE), 17 km from the middle of the area, began a volume at 06:37 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

Detroit, MI (KDTX), launched 00:00Z, 6.6 hours before the alert went out and 180 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, Detroit, MI at 00:00Z on 2011-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 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, Detroit, MI at 00:00Z on 2011-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 215 square meters per square second.19395878Sfc1 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
7 J/kg
Mixed-layer CIN
-242 J/kg
Mixed-layer LCL
1106 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
215 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

146 
ACUS11 KWNS 260638
SWOMCD
SPC MCD 260637
PAZ000-WVZ000-OHZ000-MIZ000-260800-

MESOSCALE DISCUSSION 0975
NWS STORM PREDICTION CENTER NORMAN OK
0137 AM CDT THU MAY 26 2011

AREAS AFFECTED...EXTREME SOUTHEAST LOWER MI AND NORTHERN/WESTERN OH
TO FAR WESTERN PA

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 260637Z - 260800Z

A VERY FAST MOVING SQUALL LINE WILL CONTINUE TO POSE AT LEAST AN
ISOLATED DAMAGING WIND THREAT OVER THE NEXT SEVERAL HOURS ACROSS
EXTREME LOWER MI AND NORTHERN/EASTERN OH AND PERHAPS WESTERN PA.

AN APPRECIABLE SURFACE PRESSURE RISE-FALL COUPLET IS NOTED IN
SUBJECTIVE SURFACE ANALYSIS ATTENDANT TO THE AFOREMENTIONED 50+ KT
NORTHEASTWARD-MOVING SQUALL LINE. RECENT MEASURED WIND GUSTS OVER
THE PAST HOUR INCLUDE 45 KT AT MARION OH AND 38 KT AT OSU/COLUMBUS.
THE INTEGRITY/INTENSITY OF THE SQUALL LINE SHOULD CONTINUE TO WANE
AS IT INJECTS GRADUALLY MORE STABLE/INHIBITED LOW LEVEL AIR.
NONETHELESS...DAMAGING WIND GUSTS WILL REMAIN POSSIBLE...AT LEAST ON
AN ISOLATED BASIS...OVER THE NEXT SEVERAL HOURS GIVEN THE FAST
FORWARD MOTION/MOMENTUM.

..GUYER.. 05/26/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...PBZ...RLX...CLE...ILN...DTX...

LAT...LON   42108394 42038299 41998110 42028032 40508022 39468191
            42108394

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 8:14 PM EDTMesoscale DiscussionSPCAdams, Ashland, Ashtabula, Athens, Belmont, Brown and 54 more2 hr
May 25, 9:33 PM EDTTornado WatchSPCAdams, Brown, Butler, Champaign, Clark, Clermont and 19 more7 hr
May 26, 12:23 AM EDTMesoscale DiscussionSPCMercer, Van Wert2 hr
May 26, 3:09 PM EDTMesoscale DiscussionSPCAdams, Brown, Champaign, Clark, Clermont, Clinton and 19 more96 min
May 26, 6:06 PM EDTSevere Thunderstorm WatchSPCAshtabula, Belmont, Carroll, Columbiana, Coshocton, Cuyahoga and 17 more6 hr
May 26, 11:55 AM EDTMesoscale DiscussionSPCBradford, Clinton, Columbia, Dauphin, Juniata, Lackawanna and 13 more95 min
May 26, 2:16 PM EDTTornado WatchSPCBradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more8 hr
May 26, 2:53 PM EDTTornado WatchSPCAdams, Bedford, Blair, Centre, Clinton, Columbia and 20 more7 hr
May 26, 5:49 PM EDTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Blair, Bradford, Cambria and 41 more56 min
May 26, 1:15 PM EDTMesoscale DiscussionSPCBarbour, Boone, Braxton, Calhoun, Clay, Doddridge and 31 more90 min
May 26, 1:42 PM EDTSevere Thunderstorm WatchSPCBarbour, Berkeley, Boone, Braxton, Calhoun, Clay and 42 more11 hr
May 26, 4:30 PM EDTMesoscale DiscussionSPCBarbour, Boone, Braxton, Calhoun, Clay, Doddridge and 30 more60 min

Nearby

Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Pennsylvania, 2011Mesoscale Discussions in Michigan, 2011Every mesoscale discussion in 2011

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.