Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 874

May 9, 200340 counties in Indiana; 38 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 9, 2003, 5:04 AM EST for 40 counties in Indiana; 38 counties in Ohio. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
May 9, 2003, 5:04 AM EST (10:04 UTC)
Expired
May 9, 2003, 6:30 AM EST
In force
86 min
Issued by
the Storm Prediction Center
All 78 counties

Adams County, IN, Allen County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Johnson County, IN, Kosciusko County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Pulaski County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hancock County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Paulding County, OH, Pickaway County, OH, Preble County, OH, Putnam County, OH, Richland County, OH, Ross County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Vinton County, OH, Warren County, OH, Wyandot County, OH

The radar

The Cincinnati radar (KILN), 116 km from the middle of the area, began a volume at 10:06 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 00:00Z, 10.1 hours before the alert went out and 116 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 00:00Z on 2003-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2003-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1904 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
150 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.

842 
ACUS11 KWNS 091004
SWOMCD
SPC MCD 091004 
OHZ000-INZ000-091130-

MESOSCALE DISCUSSION 0874
NWS STORM PREDICTION CENTER NORMAN OK
0504 AM CDT FRI MAY 09 2003

AREAS AFFECTED...ERN IND/WRN OH

CONCERNING...SEVERE THUNDERSTORM WATCH 316...

VALID 091004Z - 091130Z

THE THREAT OF ISOLATED LARGE HAIL/DAMAGING WINDS CONTINUES ACROSS
WW0315.

REGIONAL RADAR DATA INDICATE A LARGE AREA OF ELEVATED CONVECTION
OCCURRING ACROSS WW0315 TO THE N OF SURFACE WARM FRONT THAT EXTENDED
FROM BMI EWD TO AROUND MIE AND THEN SEWD TO HTS. 3-4MB/2HR PRESSURE
FALLS OBSERVED IN LATEST MESOANALYSIS OVER E-CNTRL IND INTO W-CNTRL
OH IS LIKELY INDICATIVE OF STRONG WAA/ISENTROPIC ASCENT OCCURRING
OVER SURFACE FRONTAL ZONE ALONG 60-65KT SWLY LLJ /EVIDENT ON PLAN
VIEW PROFILER/VWP NETWORK/.

RUC FORECAST SOUNDINGS IN THIS AIRMASS SUGGEST THAT ONLY A SHALLOW
BOUNDARY-LAYER INVERSION EXISTS N OF THE WARM FRONT WHICH IS LIKELY
ALLOWING THE STRONGEST DOWNDRAFTS TO REACH THE GROUND AS EVIDENCED
BY THE ISOLATED WIND DAMAGE REPORTS OVER IND. ALTHOUGH THE AIRMASS
ABOVE THIS SHALLOW INVERSION REMAINS ONLY SLIGHTLY UNSTABLE WITH
MUCAPES OF 500-1000 J/KG...STRONG DYNAMIC FORCING ASSOCIATED WITH
THE LLJ WILL CONTINUE TO SUPPORT THE THREAT STRONG TO SEVERE TSTMS
PRIMARILY OVER OH FOR THE NEXT COUPLE OF HOURS WITH THE POTENTIAL
FOR ISOLATED LARGE HAIL AND DAMAGING WINDS.


..MEAD.. 05/09/2003

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

ATTN...WFO...RLX...CLE...ILN...IWX...IND...

39868693 40328692 40938690 41238691 41418691 41438685
41238549 41128421 41018316 40938259 40938244 40918238
40588239 39868240 39398241 39168240 39078239 39048245
39168347 39368485 39478595 39578673 39598694 39668694

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 7:06 PM ESTMesoscale DiscussionSPCCrawford, Dubois, Floyd, Gibson, Harrison, Perry and 5 more54 min
May 9, 12:05 AM ESTSevere Thunderstorm WatchSPCBenton, Fountain, Jasper, Newton, Porter, Vermillion and 1 more6 hr
May 9, 1:21 AM ESTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 51 more84 min
May 9, 1:45 AM ESTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 34 more5 hr
May 9, 2:02 PM ESTMesoscale DiscussionSPCClark, Crawford, Daviess, Dearborn, Dubois, Floyd and 20 more2 hr
May 9, 2:40 PM ESTSevere Thunderstorm WatchSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 22 more5 hr
May 9, 2:48 PM ESTMesoscale DiscussionSPCPosey117 min
May 9, 5:44 PM ESTMesoscale DiscussionSPCBenton, Blackford, Boone, Carroll, Cass, Clay and 38 more31 min
May 9, 6:05 PM ESTTornado WatchSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 30 more5 hr
May 9, 4:36 PM ESTMesoscale DiscussionSPCAthens, Delaware, Fairfield, Franklin, Hocking, Licking and 9 more114 min
May 9, 5:00 PM ESTSevere Thunderstorm WatchSPCAthens, Fairfield, Gallia, Hocking, Jackson, Lawrence and 6 more5 hr

Nearby

Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Ohio, 2003Every mesoscale discussion in 2003

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.