Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 1605

July 4, 20035 states

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2003, 12:48 PM CDT for 5 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Jul 4, 2003, 12:48 PM CDT (17:48 UTC)
Expired
Jul 4, 2003, 2:45 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 58 counties

Des Moines County, IA, Henry County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Carroll County, IN, Cass County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Wabash County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Rock County, WI, Walworth County, WI

The radar

The Chicago radar (KLOT), 69 km from the middle of the area, began a volume at 17:51 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, 5.8 hours before the alert went out and 163 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 2003-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1934 joules per kilogram.LCLLFCEL10008507005003002001001 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 2003-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 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
1934 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
1197 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
114 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
Jul 4, 1:15 AM CDTSevere Thunderstorm WatchSPCCarroll, Jo Daviess, Lee, Ogle, Rock Island, Stephenson and 2 more6 hr
Jul 4, 3:27 AM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Grundy and 12 more93 min
Jul 4, 5:20 AM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Kane, Lake and 1 more4 hr
Jul 4, 7:25 AM CDTMesoscale DiscussionSPCCook, Lake, McHenry95 min
Jul 4, 2:20 PM CDTSevere Thunderstorm WatchSPCBureau, Champaign, DeWitt, Ford, Fulton, Grundy and 21 more6 hr
Jul 4, 3:29 PM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Ford, Iroquois, Kankakee and 4 more2 hr
Jul 4, 5:07 PM CDTMesoscale DiscussionSPCBond, Clark, Clay, Clinton, Coles, Crawford and 27 more53 min
Jul 4, 6:29 PM CDTMesoscale DiscussionSPCBureau, Champaign, Clark, Coles, DeWitt, Douglas and 29 more61 min
Jul 4, 7:50 AM CDTSevere Thunderstorm WatchSPCElkhart, LaGrange, LaPorte, Saint Joseph, Steuben3 hr
Jul 4, 9:28 AM CDTMesoscale DiscussionSPCDeKalb, Elkhart, Kosciusko, LaGrange, Noble, Steuben2 hr
Jul 4, 12:04 PM CDTMesoscale DiscussionSPCAllen, DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte and 7 more116 min
Jul 4, 1:45 PM CDTMesoscale DiscussionSPCAdams, Allen, DeKalb, Whitley60 min
Jul 4, 5:50 PM CDTSevere Thunderstorm WatchSPCBartholomew, Brown, Clay, Daviess, Dearborn, Decatur and 29 more5 hr
Jul 3, 8:11 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more94 min
Jul 3, 9:40 PM CDTSevere Thunderstorm WatchSPCBoone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 22 more6 hr
Jul 3, 11:23 PM CDTMesoscale DiscussionSPCAllamakee, Boone, Bremer, Buena Vista, Butler, Calhoun and 36 more97 min
Jul 4, 12:42 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Boone, Bremer, Butler, Calhoun and 24 more63 min
Jul 4, 9:45 AM CDTSevere Thunderstorm WatchSPCClinton, Genesee, Gratiot, Hillsdale, Ingham, Jackson and 11 more5 hr

Nearby

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