Alert archive / Missouri / Mesoscale Discussions in 2003

Mesoscale Discussion 2407

September 26, 200329 counties in Illinois; Lee County, Iowa; 38 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Sep 26, 2003, 12:21 PM CDT for 29 counties in Illinois; Lee County, Iowa; 38 counties in Missouri. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Sep 26, 2003, 12:21 PM CDT (17:21 UTC)
Expired
Sep 26, 2003, 2:15 PM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 68 counties

Lee County, IA, Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Knox 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, Peoria County, IL, Pike County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Adair County, MO, Audrain County, MO, Benton County, MO, Boone County, MO, Caldwell County, MO, Callaway County, MO, Carroll County, MO, Cass County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Clinton County, MO, Cole County, MO, Cooper County, MO, Henry County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Knox County, MO, Lafayette County, MO, Lewis County, MO, Lincoln County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Pettis County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Scotland County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 159 km from the middle of the area, began a volume at 17:22 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, 5.4 hours before the alert went out and 316 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, Lincoln, IL at 12:00Z on 2003-09-26Temperature 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, Lincoln, IL at 12:00Z on 2003-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 210 square meters per square second.19395878Sfc1 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
2018 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
210 m²/s²
0-3 km storm-relative helicity
246 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 26, 1:20 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 26 more6 hr
Sep 26, 4:32 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 19 more88 min
Sep 26, 4:50 PM CDTTornado WatchSPCBond, Champaign, Christian, Clark, Clay, Coles and 18 more5 hr
Sep 26, 5:06 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 26 more84 min
Sep 26, 6:10 PM CDTSevere Thunderstorm WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more7 hr
Sep 26, 6:59 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Coles and 17 more91 min
Sep 26, 2:52 PM CDTMesoscale DiscussionSPCBarton, Bates, Cass, Vernon113 min
Sep 26, 2:55 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Cass, Jasper, Vernon4 hr

Nearby

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