Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 210

March 8, 200332 counties in Illinois; 27 counties in Indiana; Saint Louis County, City of Saint Louis, Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 8, 2003, 1:23 PM CST for 32 counties in Illinois; 27 counties in Indiana; Saint Louis County, City of Saint Louis, Missouri. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Mar 8, 2003, 1:23 PM CST (19:23 UTC)
Expired: Mar 8, 2003, 4:30 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center

All 61 counties

Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, Benton County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Clinton County, IN, Daviess County, IN, Fountain County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, City of Saint Louis, MO, Saint Louis County, MO

The watches that followed

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

Severe Thunderstorm Watch 33Mar 8, 2:50 PM CST

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.4 hours before the alert went out and 113 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: 1620 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 326 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.

165 
ACUS11 KWNS 081923
SWOMCD
SPC MCD 081923 
ILZ000-INZ000-082230-

MESOSCALE DISCUSSION 0210
NWS STORM PREDICTION CENTER NORMAN OK
0123 PM CST SAT MAR 08 2003

AREAS AFFECTED...CENTRAL IL...WRN IN

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 081923Z - 082230Z

...THUNDERSTORMS SHOULD DEVELOP/INTENSIFY AHEAD OF COLD FRONT
ACROSS PORTIONS OF IL AND WRN IN BY MID-LATE AFTERNOON.  SEVERE
THUNDERSTORM WATCH MAY BE REQUIRED IN THE NEXT SEVERAL HOURS...



BOUNDARY LAYER AIR MASS IS DEEPENING AHEAD OF COLD FRONT FROM
CENTRAL MO NEWD INTO ERN IL AS STRONG SUNSHINE AND VEERED LOW
LEVEL FLOW PERSISTS.  IT APPEARS BOUNDARY LAYER IS NEAR
CONVECTIVE TEMPERATURE ACROSS PORTIONS OF MO WHERE SCATTERED CU
HAVE RECENTLY DEVELOPED.  AS MOISTURE ADVECTS NEWD ACROSS THE
BOOTHEEL INTO SRN IL ADDITIONAL DESTABILIZATION IS EXPECTED OVER
THE NEXT FEW HOURS.  THUNDERSTORMS WILL LIKELY INITIATE ALONG
PRE-FRONTAL CONFLUENCE ZONE EAST OF STL BY 4PM...THEN
SPREAD/DEVELOP NEWD INTO WRN IND.  STRONG FORCING SHOULD ORGANIZE
ACTIVITY INTO LOW TOPPED SQUALL LINE WHICH MAY EVOLVE INTO LEWP
WITH POTENTIAL FOR DAMAGING BOW ECHOES.  SEVERE THUNDERSTORM
WATCH MAY BE REQUIRED BY 4 PM.

..DARROW.. 03/08/2003

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

38519057 39738968 40698711 39918574 38728611 37938954

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 8, 2:50 PM CST	Severe Thunderstorm Watch	SPC	Clark, Clay, Coles, Crawford, Cumberland, Douglas and 16 more	6 hr
Mar 8, 4:58 PM CST	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Douglas and 16 more	2 hr

Nearby

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