Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 1851

July 15, 20036 states

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2003, 2:40 AM CDT for 6 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2003, 2:40 AM CDT (07:40 UTC)
Expired: Jul 15, 2003, 5:30 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 79 counties

Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Adams County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock 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, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Starke County, IN, White County, IN, Berrien County, MI, Van Buren County, MI, Clark County, MO, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 74 km from the middle of the area, began a volume at 07:40 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.7 hours before the alert went out and 68 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: 2108 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 105 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.

Issued	Product	Office	Counties	Lasted
Jul 15, 8:35 AM CDT	Severe Thunderstorm Watch	SPC	Clay, Crawford, Edwards, Franklin, Gallatin, Hamilton and 13 more	5 hr
Jul 14, 7:16 PM CDT	Mesoscale Discussion	SPC	Allamakee, Chickasaw, Clayton, Fayette, Howard, Mitchell and 1 more	119 min
Jul 14, 7:40 PM CDT	Tornado Watch	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Fayette and 12 more	4 hr
Jul 14, 9:24 PM CDT	Mesoscale Discussion	SPC	Audubon, Boone, Calhoun, Carroll, Crawford, Dallas and 7 more	36 min
Jul 14, 11:05 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 22 more	55 min

Nearby

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