Alert archive / Ohio / Mesoscale Discussions in 2004

Mesoscale Discussion 752

May 18, 20046 states

The Storm Prediction Center issued this mesoscale discussion at May 18, 2004, 6:09 PM CDT for 6 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
May 18, 2004, 6:09 PM CDT (23:09 UTC)
Expired
May 18, 2004, 7:45 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 154 counties

Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Lawrence County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marion County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Wabash County, IL, Wayne County, IL, Adams County, IN, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jay County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Ohio County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Switzerland County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wayne County, IN, Boone County, KY, Campbell County, KY, Gallatin County, KY, Kenton County, KY, Athens County, OH, Auglaize 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, Darke County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Mahoning County, OH, Meigs County, OH, Mercer County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Shelby County, OH, Stark County, OH, Tuscarawas County, OH, Union County, OH, Van Wert County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Fayette County, PA, Greene County, PA, Lawrence County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Doddridge County, WV, Hancock County, WV, Harrison County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Ritchie County, WV, Taylor County, WV, Tyler County, WV, Wetzel County, WV, Wood County, WV

The radar

The Indianapolis radar (KIND), 79 km from the middle of the area, began a volume at 23:09 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 12:00Z, 11.2 hours before the alert went out and 165 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, Cncnati-Daytn, OH at 12:00Z on 2004-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1159 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, Cncnati-Daytn, OH at 12:00Z on 2004-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 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
1159 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
658 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.3

Open this sounding in Storm Lab

The text

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

260 
ACUS11 KWNS 182309
SWOMCD
SPC MCD 182309 
INZ000-ILZ000-PAZ000-MDZ000-WVZ000-OHZ000-KYZ000-190045-

MESOSCALE DISCUSSION 0752
NWS STORM PREDICTION CENTER NORMAN OK
0609 PM CDT TUE MAY 18 2004

AREAS AFFECTED...PORTIONS IL...INDIANA...OH...NRN WV...WRN PA

CONCERNING...SEVERE THUNDERSTORM WATCH 215...216...

VALID 182309Z - 190045Z

SEVERAL BANDS AND CLUSTERS OF TSTMS WILL CONTINUE MOVING EWD ACROSS
WW AREAS.  SEVERE POTENTIAL HAS PEAKED AND SHOULD GRADUALLY DIMINISH
OVER NEXT 2-3 HOURS WITH LOSS OF DIABATIC HEATING AND RESULTANT
REDUCTION OF SBCAPE.  ISOLATED DAMAGING WIND OR MARGINALLY SEVERE
HAIL WILL REMAIN POSSIBLE AFTER SCHEDULED 00Z EXPIRATION OF THESE
WWS.  HOWEVER...THREAT DOES NOT APPEAR INTENSE AND/OR LONG-LIVED
ENOUGH ATTM TO WARRANT ADDITIONAL WW ISSUANCE BEYOND 00Z.

N-S BAND OF CONVECTION NOW OVER CENTRAL/SRN IL WILL MOVE EWD ACROSS
SERN IL INTO SWRN INDIANA AND NRN KY...AND HAS SHOWN CONSIDERABLE
DISORGANIZATION TREND IN COMPOSITE REFLECTIVITY DURING PAST HOUR. 
ENVIRONMENT IN FOREGOING AIR MASS WILL BE CHARACTERIZED BY AROUND
1500 J/KG MLCAPE...NEARLY UNIDIRECTIONAL DEEP-LAYER WIND PROFILES
AND LESS THAN 15 KT OR LESS ABSOLUTE SPEEDS THROUGH LOWEST 3-4 KM
AGL.  POST-CONVECTIVE OBSERVATIONS SUGGEST LACK OF SUBSTANTIAL COLD
POOL TO FORCE ASCENT...THEREFORE WEAKENING TREND SHOULD CONTINUE. 
FARTHER E ACROSS SRN OH/SRN INDIANA/NRN WV...AIR MASS REMAINS
MARGINALLY FAVORABLE THERMODYNAMICALLY WITH MLCAPE AROUND 1500 J/KG
FOR ANOTHER 2-3 HOURS. HOWEVER...VERY WEAK DEEP LAYER IS EVIDENT
WITH 20 KT OR LESS FLOW IN 500-300 MB LAYER.

..EDWARDS.. 05/18/2004

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

ATTN...WFO...IND...PAH...LOT...ILX...LSX...CTP...LWX...PBZ...RLX...CLE...ILN...IWX...

38318915 39418907 39979071 40099067 40848901 41158743
38648745 

38878740 40148742 40248604 40388543 40528525 40748519
40988490 40988453 40098301 40208225 40528165 40708154
41058106 41097926 39317929

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 17, 7:15 PM CDTSevere Thunderstorm WatchSPCBoone, Carroll, DeKalb, Jo Daviess, Lee, McHenry and 6 more5 hr
May 17, 11:37 PM CDTMesoscale DiscussionSPCBureau, Cook, DeKalb, DuPage, Grundy, Kane and 8 more23 min
May 18, 12:41 AM CDTMesoscale DiscussionSPCGrundy, Kankakee, Will2 hr
May 18, 10:26 AM CDTMesoscale DiscussionSPCBond, Brown, Bureau, Calhoun, Cass, Champaign and 38 more3 hr
May 18, 12:00 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 48 more7 hr
May 18, 2:38 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Clinton and 23 more2 hr
May 18, 11:55 AM CDTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 34 more2 hr
May 18, 12:45 PM CDTSevere Thunderstorm WatchSPCAdams, Allen, Bartholomew, Benton, Blackford, Boone and 49 more6 hr
May 18, 3:02 PM CDTMesoscale DiscussionSPCAdams, Blackford, Boone, Carroll, Cass, Clinton and 15 more118 min
May 18, 11:54 AM CDTMesoscale DiscussionSPCBelmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 13 more66 min
May 18, 12:04 PM CDTMesoscale DiscussionSPCBradford, Lackawanna, Luzerne, Sullivan, Susquehanna, Wayne and 1 more56 min
May 18, 12:50 PM CDTSevere Thunderstorm WatchSPCBradford, Cameron, Elk, Jefferson, McKean, Potter and 2 more8 hr
May 18, 1:54 PM CDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bucks, Cambria and 33 more96 min
May 18, 5:24 PM CDTMesoscale DiscussionSPCBradford, Cameron, Elk, Jefferson, McKean, Potter and 2 more2 hr
May 18, 6:49 PM CDTMesoscale DiscussionSPCChester, Delaware, Lancaster, Montgomery, Philadelphia, York2 hr
May 18, 12:14 PM CDTMesoscale DiscussionSPCBerkeley, Hampshire, Hardy, Jefferson, Pendleton2 hr

Nearby

Mesoscale Discussions in Ohio, 2004Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Illinois, 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.