Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1709

July 16, 20045 states

The Storm Prediction Center issued this mesoscale discussion at Jul 16, 2004, 2:45 PM CDT for 5 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jul 16, 2004, 2:45 PM CDT (19:45 UTC)
Expired: Jul 16, 2004, 4:15 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 86 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb 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, 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, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island 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, Carroll County, IN, Cass County, IN, Clinton County, IN, Elkhart County, IN, Fulton County, IN, Howard County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Warren County, IN, White County, IN, Berrien County, MI, Cass County, MI, Van Buren County, MI, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 90 km from the middle of the area, began a volume at 19:49 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 12:00Z, 7.8 hours before the alert went out and 85 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: 227 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 44 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 16, 10:51 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 22 more	2 hr
Jul 16, 12:10 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more	5 hr
Jul 15, 11:34 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Decatur, Fremont and 10 more	86 min
Jul 15, 8:01 PM CDT	Mesoscale Discussion	SPC	Barry, Jasper, McDonald, Newton	119 min
Jul 16, 3:33 AM CDT	Mesoscale Discussion	SPC	Andrew, Barton, Bates, Benton, Buchanan, Cass and 19 more	117 min
Jul 16, 3:45 AM CDT	Severe Thunderstorm Watch	SPC	Barry, Barton, Bates, Benton, Camden, Cass and 27 more	5 hr
Jul 16, 6:28 AM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Camden, Cedar, Christian and 18 more	92 min

Nearby

Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Indiana, 2004 Mesoscale Discussions in Iowa, 2004 Every mesoscale discussion in 2004

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.