Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 902

May 10, 200321 counties in Illinois; Lee County, Iowa; 17 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 5:43 AM CDT for 21 counties in Illinois; Lee County, Iowa; 17 counties in Missouri. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 10, 2003, 5:43 AM CDT (10:43 UTC)
Expired: May 10, 2003, 7:15 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 39 counties

Lee County, IA, Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Logan County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Tazewell County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 117 km from the middle of the area, began a volume at 10:45 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.

Severe Thunderstorm Watch 334May 10, 5:50 AM CDT

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 10.7 hours before the alert went out and 222 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: 1901 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 207 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.

000 
ACUS11 KWNS 101043
SWOMCD
SPC MCD 101043 
ILZ000-MOZ000-IAZ000-101215-

MESOSCALE DISCUSSION 0902
NWS STORM PREDICTION CENTER NORMAN OK
0543 AM CDT SAT MAY 10 2003

AREAS AFFECTED...NERN MO/FAR SERN IA INTO W-CNTRL MO

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 101043Z - 101215Z

THE THREAT OF LARGE HAIL WILL CONTINUE TO INCREASE ACROSS THE AREA
OVER THE NEXT 1 TO 2 HOURS AND A WW WILL BE ISSUED SOON.

LATEST MESOANALYSIS SHOWED SURFACE WARM FRONT EXTENDING FROM SZL
NEWD TO AROUND SPI. 50-60KT SWLY LLJ IS ENHANCING LOW-LEVEL
LOW-LEVEL MOIST/THERMAL ADVECTION OVER THIS FRONTAL ZONE AND
EFFECTIVELY DESTABILIZING PRE FRONTAL AIRMASS FROM NERN MO INTO
W-CNTRL IL WITH MUCAPES APPROACHING 1000-1500 J/KG. STRENGTHENING
TSTMS OVER OVER NERN MO WILL CONTINUE TO SPREAD NEWD OVER THE NEXT
FEW HOURS WITH THE POTENTIAL FOR A FEW ELEVATED SUPERCELLS GIVEN THE
SUFFICIENT SPEED SHEAR THROUGH THE BUOYANT LAYER. LARGE HAIL WILL BE
THE PRIMARY SEVERE WEATHER THREAT WITH THE STRONGEST STORMS.

A WW WILL BE ISSUED SOON.

..MEAD.. 05/10/2003

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

ATTN...WFO...ILX...LSX...DVN...EAX...

39419261 39979248 40289243 40689200 40839081 40798994
40508935 39998912 39558912 39028953 38729068 38639162
38649245 38839264

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 7:47 PM CDT	Mesoscale Discussion	SPC	Calhoun, Greene, Morgan, Pike, Scott	88 min
May 9, 8:40 PM CDT	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Clinton, Coles and 18 more	2 hr
May 9, 10:04 PM CDT	Mesoscale Discussion	SPC	Adams	26 min
May 9, 10:40 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Cass, Champaign, DeWitt, Ford, Fulton and 22 more	5 hr
May 10, 5:50 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 25 more	5 hr
May 10, 8:30 AM CDT	Tornado Watch	SPC	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more	6 hr
May 10, 9:25 AM CDT	Mesoscale Discussion	SPC	Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more	2 hr
May 10, 10:39 AM CDT	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Douglas and 5 more	2 hr
May 10, 10:54 AM CDT	Mesoscale Discussion	SPC	Adams, Alexander, Bond, Brown, Calhoun, Cass and 69 more	66 min
May 10, 12:38 PM CDT	Mesoscale Discussion	SPC	Clay, Crawford, Jasper, Lawrence, Richland	97 min
May 10, 3:17 PM CDT	Mesoscale Discussion	SPC	Hancock, Henderson, Mercer, Rock Island	58 min
May 10, 3:50 PM CDT	Tornado Watch	SPC	Bureau, Carroll, Fulton, Henderson, Henry, Jo Daviess and 14 more	6 hr
May 10, 4:00 PM CDT	Tornado Watch	SPC	Franklin, Jackson, Perry, Randolph, Union	5 hr
May 10, 4:48 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 25 more	87 min
May 10, 5:40 PM CDT	Tornado Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 21 more	5 hr
May 10, 6:41 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 14 more	64 min
May 10, 5:57 PM CDT	Mesoscale Discussion	SPC	Allamakee, Clayton, Fayette	93 min
May 10, 6:15 PM CDT	Tornado Watch	SPC	Allamakee, Clayton, Fayette, Winneshiek	5 hr
May 9, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Barton, Bates, Benton, Caldwell, Carroll and 36 more	6 hr
May 10, 1:15 AM CDT	Severe Thunderstorm Watch	SPC	Andrew	5 hr
May 10, 1:22 AM CDT	Mesoscale Discussion	SPC	Newton	83 min
May 10, 2:28 AM CDT	Mesoscale Discussion	SPC	Andrew, Buchanan	92 min
May 10, 3:05 AM CDT	Tornado Watch	SPC	Barton, Bates, Benton, Cedar, Dade, Henry and 7 more	5 hr
May 10, 3:15 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more	5 hr
May 10, 5:27 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Cass, Cedar, Dade and 9 more	93 min
May 10, 7:06 AM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more	54 min
May 10, 10:58 AM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Audrain, Barton, Bates, Benton and 42 more	2 hr
May 10, 11:35 AM CDT	Tornado Watch	SPC	Adair, Audrain, Bates, Benton, Boone, Caldwell and 38 more	7 hr
May 10, 11:55 AM CDT	Tornado Watch	SPC	Barry, Barton, Camden, Cedar, Christian, Dade and 13 more	7 hr
May 10, 1:42 PM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Bates, Benton, Boone, Caldwell and 38 more	2 hr
May 10, 1:59 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Camden, Cedar, Christian, Dade and 12 more	2 hr
May 10, 3:30 PM CDT	Mesoscale Discussion	SPC	Crawford, Dent, Douglas, Franklin, Gasconade, Howell and 16 more	2 hr

Nearby

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