Alert archive / Ohio / Mesoscale Discussions in 2012

Mesoscale Discussion 1608

July 26, 20129 states

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2012, 3:37 PM EDT for 9 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Jul 26, 2012, 3:37 PM EDT (19:37 UTC)
Expired
Jul 26, 2012, 5:30 PM EDT
In force
113 min
Issued by
the Storm Prediction Center
All 225 counties

New Castle County, DE, Boone County, KY, Boyd County, KY, Bracken County, KY, Campbell County, KY, Carter County, KY, Fleming County, KY, Gallatin County, KY, Grant County, KY, Greenup County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Pendleton County, KY, Robertson County, KY, Allegany County, MD, Garrett County, MD, Washington County, MD, Atlantic County, NJ, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Passaic County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Cattaraugus County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY, Adams County, OH, Ashland County, OH, Ashtabula County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Butler County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Erie County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Geauga County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Huron County, OH, Jackson County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lawrence County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Meigs County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Ottawa County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Portage County, OH, Preble County, OH, Richland County, OH, Ross County, OH, Sandusky County, OH, Scioto County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Wayne County, OH, Wyandot County, OH, Adams County, PA, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Bucks County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Chester County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Crawford County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Elk County, PA, Erie County, PA, Fayette County, PA, Forest County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lancaster County, PA, Lawrence County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Mifflin County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Pike County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, York County, PA, Washington County, RI, Barbour County, WV, Braxton County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Gilmer County, WV, Grant County, WV, Hampshire County, WV, Hancock County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Mineral County, WV, Monongalia County, WV, Morgan County, WV, Nicholas County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.6 hours before the alert went out and 133 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, Washington/Dulle, VA at 12:00Z on 2012-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1172 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, Washington/Dulle, VA at 12:00Z on 2012-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 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
1172 J/kg
Mixed-layer CIN
-226 J/kg
Mixed-layer LCL
985 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
170 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.

725 
ACUS11 KWNS 261938
SWOMCD
SPC MCD 261937
RIZ000-CTZ000-NYZ000-NJZ000-PAZ000-DEZ000-MDZ000-WVZ000-VAZ000-OHZ000-KYZ000-INZ000-262130-

MESOSCALE DISCUSSION 1608
NWS STORM PREDICTION CENTER NORMAN OK
0237 PM CDT THU JUL 26 2012

AREAS AFFECTED...PORTIONS OH...NERN KY...WV...PA...SERN NY...SRN NEW
ENGLAND...NJ.

CONCERNING...SEVERE THUNDERSTORM WATCH 524...

VALID 261937Z - 262130Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 524
CONTINUES.

SUMMARY...CONTINUE WW ALONG/AHEAD OF STG-SVR TSTMS NOW OVER NRN/WRN
PORTIONS.  NEW WW WILL BE ISSUED SOON...DOWNSHEAR FOR ERN PA EWD
TOWARD SWRN NEW ENGLAND AND LONG ISLAND INCLUDING NYC METRO AREA.

DISCUSSION...INCREASINGLY WELL-ORGANIZED SQUALL LINE...WITH EMBEDDED
BOW/LEWP SEGMENTS...WAS EVIDENT AT 1930Z FROM STEUBEN COUNTY NY SWWD
TO COLUMBIANA COUNTY OH...BECOMING MORE BKN SWWD OVER SERN OH.  THIS
ACTIVITY CONTINUES MOVING EWD 40-50 KT...WITH LOCAL VARIATIONS AS
COLD-POOL SURGES OCCUR...AND WILL MOVE INTO FAVORABLY
UNSTABLE/BUOYANT AIR MASS ACROSS CENTRAL/ERN PA AND EVENTUALLY EWD
TO SRN NEW ENGLAND.  MIDLEVEL LAPSE RATES WILL CONTINUE TO DIMINISH
WHILE  CINH INCREASES WITH EWD EXTENT...PER 18Z RAOBS.
HOWEVER...STG BOUNDARY-LAYER HEATING IS FCST...WITH LOW-LEVEL WLYS
ALSO CONTRIBUTING TO CAPE THROUGH MOISTURE ADVECTION/TRANSPORT.  AS
SUCH...FAVORABLE AIR MASS WILL SPREAD/DEVELOP EWD OVER CT/RI/LONG
ISLAND.  THIS CORRIDOR WILL REMAIN BENEATH SRN RIM OF STRONGEST
MIDLEVEL WINDS...CONTRIBUTING TO EFFECTIVE SHEAR MAGNITUDES 40-50
KT.  DIFFUSE SFC WARM FRONT WILL CONTINUE TO MOVE NEWD OVER ERN/NRN
PA INTO SERN NY.  NEARLY UNIDIRECTIONAL WIND PROFILES SHOULD
CONTINUE...BUT WITH SLGT VEERING IN LOWEST 1-2 KM AGL INVOF WARM
FRONT.

..EDWARDS.. 07/26/2012

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

ATTN...WFO...BOX...OKX...ALY...PHI...BGM...BUF...CTP...LWX...
PBZ...RLX...CLE...JKL...ILN...LMK...IWX...

LAT...LON   38798495 39988466 41618313 42337923 42057718 41177637
            41467396 42007191 41227146 40737280 40487399 39877405
            39337436 38917499 39307537 39727589 39497809 38787969
            38148113 38348404 38798495

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 26, 1:50 PM EDTMesoscale DiscussionSPC115 min
Jul 26, 2:10 PM EDTTornado WatchSPCNorthwest Hills Planning Region6 hr
Jul 26, 3:57 PM EDTSevere Thunderstorm WatchSPCGreater Bridgeport Planning Region, Capitol Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Northeastern Connecticut Planning Region6 hr
Jul 26, 6:04 PM EDTMesoscale DiscussionSPC86 min
Jul 26, 7:28 PM EDTMesoscale DiscussionSPC92 min
Jul 26, 3:08 PM EDTMesoscale DiscussionSPCKent, Sussex2 hr
Jul 26, 5:54 PM EDTSevere Thunderstorm WatchSPCKent, New Castle, Sussex6 hr
Jul 26, 12:26 PM EDTMesoscale DiscussionSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 11 more2 hr
Jul 26, 1:16 PM EDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 7 more9 hr
Jul 26, 2:25 PM EDTMesoscale DiscussionSPCBallard, Carlisle, Livingston, McCracken65 min
Jul 26, 2:46 PM EDTSevere Thunderstorm WatchSPCAdair, Allen, Anderson, Ballard, Barren, Bourbon and 65 more10 hr
Jul 26, 4:55 PM EDTMesoscale DiscussionSPCAnderson, Ballard, Breckinridge, Bullitt, Butler, Caldwell and 39 more35 min
Jul 26, 4:57 PM EDTMesoscale DiscussionSPCBath, Bourbon, Breathitt, Carter, Casey, Clark and 30 more2 hr
Jul 26, 6:06 PM EDTMesoscale DiscussionSPCBoyd, Greenup, Lewis84 min
Jul 26, 6:26 PM EDTSevere Thunderstorm WatchSPCBath, Boyd, Breathitt, Carter, Clay, Elliott and 24 more7 hr
Jul 26, 7:29 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 10 more61 min
Jul 26, 1:15 AM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 4 more2 hr
Jul 26, 4:31 AM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Chautauqua, Chemung, Livingston, Ontario and 5 more89 min

Nearby

Mesoscale Discussions in Ohio, 2012Mesoscale Discussions in Pennsylvania, 2012Mesoscale Discussions in West Virginia, 2012Every mesoscale discussion in 2012

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.