Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 1152

May 30, 20036 counties in Illinois; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 30, 2003, 2:08 PM CDT for 6 counties in Illinois; 5 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 30, 2003, 2:08 PM CDT (19:08 UTC)
Expired: May 30, 2003, 4:45 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Boone County, IL, Carroll County, IL, Ogle County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Dane County, WI, Green County, WI, Jefferson County, WI, Rock County, WI, Walworth County, WI

The radar

The Milwaukee radar (KMKX), 85 km from the middle of the area, began a volume at 19:11 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.

Tornado Watch 442May 30, 3:45 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.1 hours before the alert went out and 137 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: 2273 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 187 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
May 30, 4:32 AM CDT	Mesoscale Discussion	SPC	Carroll, Henderson, Henry, Jo Daviess, Mercer, Rock Island and 3 more	58 min
May 30, 2:06 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Ogle, Stephenson, Whiteside, Winnebago	2 hr
May 30, 3:45 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, DeKalb, Fulton, Henry and 23 more	5 hr
May 30, 6:55 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Fulton, Henry and 21 more	95 min
May 29, 10:46 PM CDT	Mesoscale Discussion	SPC	Burnett, Douglas, Washburn	89 min
May 29, 11:30 PM CDT	Severe Thunderstorm Watch	SPC	Burnett, Douglas, Washburn	6 hr
May 30, 1:23 AM CDT	Mesoscale Discussion	SPC	Burnett, Douglas, Washburn	67 min
May 30, 5:54 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Clark, Forest, Juneau and 16 more	96 min

Nearby

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