Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 1620

July 5, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2003, 2:31 AM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jul 5, 2003, 2:31 AM CDT (07:31 UTC)
Expired
Jul 5, 2003, 4:00 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 68 counties

Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington 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, Jo Daviess 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, Lake County, IN, Newton County, IN, Porter County, IN, Columbia County, WI, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 86 km from the middle of the area, began a volume at 07:34 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

Davenport, (KDVN), launched 00:00Z, 7.5 hours before the alert went out and 79 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, Davenport, at 00:00Z on 2003-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 135 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, Davenport, at 00:00Z on 2003-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
135 J/kg
Mixed-layer CIN
-351 J/kg
Mixed-layer LCL
2353 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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, 8:58 PM CDTMesoscale DiscussionSPCDuPage, Grundy, Iroquois, Kane, Kankakee, Kendall and 1 more62 min
Jul 4, 10:09 PM CDTMesoscale DiscussionSPCBrown, Cass, Champaign, DeWitt, Douglas, Ford and 20 more2 hr
Jul 4, 10:45 PM CDTMesoscale DiscussionSPCJo Daviess, Rock Island90 min
Jul 4, 11:25 PM CDTSevere Thunderstorm WatchSPCCarroll, Henderson, Henry, Jo Daviess, Knox, Mercer and 6 more7 hr
Jul 5, 3:40 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more4 hr
Jul 5, 5:43 AM CDTMesoscale DiscussionSPCCook, Kankakee, Lake, Will92 min
Jul 5, 12:55 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more3 hr
Jul 5, 4:34 PM CDTMesoscale DiscussionSPCChampaign, Ford, Iroquois, Vermilion56 min
Jul 5, 5:18 PM CDTMesoscale DiscussionSPCCass, DeWitt, Fulton, Hancock, Henderson, Henry and 16 more57 min
Jul 5, 5:55 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Champaign, Christian, Clark and 36 more6 hr
Jul 5, 6:00 AM CDTSevere Thunderstorm WatchSPCElkhart, LaGrange, LaPorte, Porter, Saint Joseph, Steuben3 hr
Jul 5, 7:12 AM CDTMesoscale DiscussionSPCAdams, Allen, DeKalb, Elkhart, Fulton, Huntington and 10 more93 min
Jul 5, 4:55 PM CDTSevere Thunderstorm WatchSPCBartholomew, Benton, Boone, Brown, Carroll, Clay and 35 more4 hr
Jul 4, 8:43 PM CDTMesoscale DiscussionSPCAudubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 20 more62 min
Jul 4, 9:05 PM CDTTornado WatchSPCAudubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 31 more6 hr
Jul 5, 12:19 PM CDTMesoscale DiscussionSPCHarrison, Monona2 hr
Jul 5, 3:10 PM CDTSevere Thunderstorm WatchSPCHarrison, Mills, Monona, Plymouth, Pottawattamie, Woodbury7 hr
Jul 5, 6:42 PM CDTMesoscale DiscussionSPCFremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more93 min

Nearby

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