Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 981

May 14, 200334 counties in Illinois; 20 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 14, 2003, 5:07 PM CDT for 34 counties in Illinois; 20 counties in Indiana. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 14, 2003, 5:07 PM CDT (22:07 UTC)
Expired: May 14, 2003, 7:00 PM CDT
In force: 113 min
Issued by: the Storm Prediction Center

All 54 counties

Brown County, IL, Bureau County, IL, Cass County, IL, Champaign County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Henry County, IL, Iroquois County, IL, Knox County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Woodford County, IL, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Fountain County, IN, Hamilton County, IN, Hendricks County, IN, Howard County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Putnam County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Warren County, IN, White County, IN

The radar

The Lincoln radar (KILX), 49 km from the middle of the area, began a volume at 22:09 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 watches that followed

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

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.1 hours before the alert went out and 16 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1154 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 132 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.

160 
ACUS11 KWNS 142208
SWOMCD
SPC MCD 142207 
INZ000-ILZ000-IAZ000-150000-

MESOSCALE DISCUSSION 0981
NWS STORM PREDICTION CENTER NORMAN OK
0507 PM CDT WED MAY 14 2003

AREAS AFFECTED...NRN/CENTRAL IL AND IND

CONCERNING...SEVERE THUNDERSTORM WATCH 369...

VALID 142207Z - 150000Z

CLUSTER OF SEVERE THUNDERSTORMS WILL CONTINUE TO PROGRESS ESEWD
AROUND 35 KTS TO THE ERN EDGE OF WW 369 THROUGH 15/00Z. ADDITIONAL
SEVERE THUNDERSTORM DEVELOPMENT REMAINS POSSIBLE AHEAD OF THE MAIN
CONVECTIVE CLUSTER OVER FAR WRN IND. A NEW WW MAY BE NEEDED FOR
AREAS OF NRN/CENTRAL IND IN THE NEXT HOUR.

LATEST VISIBLE SATELLITE IMAGERY SHOWS CLOUDS WERE CONTINUING TO
ERODE OVER ECENTRAL IL INTO WCENTRAL IND ALONG AND SOUTH OF A
STATIONARY BOUNDARY EXTENDING FROM 20 S OF PNT TO 20 S OF LAF. 21Z
OBJECTIVE ANALYSIS INDICATES AROUND 1000 J/KG OF MLCAPE SOUTH OF
THIS BOUNDARY. AS UPPER SHORTWAVE CONTINUES TO MOVE  SEWD ...SURFACE
MESOLOW OVER NCENTRAL IL WILL CONTINUE TO PROGRESS INTO WRN IND.
ALTHOUGH LOW LEVEL THETA-E ADVECTION...COUPLED WITH ADVECTION OF
STEEP LAPSE RATES WILL CONTINUE INTO WRN/CENTRAL IND OVER THE NEXT
SEVERAL HOURS...LOSS OF DAYTIME HEATING ALONG WITH EXPECTED
WEAKENING/VEERING OF THE LOW LEVEL JET MAY PRECLUDE AN ORGANIZED
SEVERE THREAT INTO IND. HOWEVER...IF THE CONVECTIVE COMPLEX OVER NRN
IL CAN BECOME BETTER ORGANIZED WITH A WELL DEVELOPED COLD POOL THEN
A DAMAGING WIND THREAT MAY BE SUSTAINED WELL AFTER DARK ALONG AND
SOUTH OF STATIONARY BOUNDARY INTO CENTRAL IND.

..CROSBIE.. 05/14/2003

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

ATTN...WFO...IWX...IND...LOT...ILX...LSX...DVN...

39549080 41609067 40798576 39618581

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 14, 12:36 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Cass, Champaign, Christian and 38 more	84 min
May 14, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Bureau, Cass, Champaign, DeWitt, Douglas and 33 more	6 hr
May 14, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	Henderson, Mercer	5 hr
May 14, 2:45 PM CDT	Mesoscale Discussion	SPC	Bureau, Cass, Champaign, Christian, Coles, DeWitt and 32 more	60 min
May 14, 3:23 PM CDT	Mesoscale Discussion	SPC	Hancock, Henderson	97 min
May 14, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Brown, Calhoun, Cass, Champaign, Christian and 35 more	5 hr
May 14, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Benton, Blackford, Boone, Carroll, Cass and 31 more	5 hr

Nearby

Mesoscale Discussions in Illinois, 2003 Mesoscale Discussions in Indiana, 2003 Every 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.