Alert archive / Illinois / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 32, NWS Chicago, IL

May 30, 20136 counties in Illinois

NWS Chicago, IL issued this severe thunderstorm warning at May 30, 2013, 6:42 PM CDT for 6 counties in Illinois. It was in force for 78 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 30, 2013, 6:42 PM CDT (23:42 UTC)
Expired: May 30, 2013, 8:00 PM CDT
In force: 78 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Boone County, IL, DeKalb County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL

The radar

The Chicago radar (KLOT), 93 km from the middle of the area, began a volume at 23:45 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 30, 12:32 PM CDT	Tornado Watch	SPC	7 hr
May 30, 5:48 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.7 hours before the alert went out and 138 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: 378 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 920 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 30, 5:39 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, May 30, 5:39 PM CDT, 1 hour 3 minutes before

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Hazardous weather outlook, May 30, 5:03 PM CDT, 1 hour 39 minutes before

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In the hours before

Local storm report, May 30, 5:04 PM CDT, 1 hour 38 minutes before

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Local storm report, May 30, 5:09 PM CDT, 1 hour 33 minutes before

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Local storm report, May 30, 5:14 PM CDT, 1 hour 28 minutes before

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Special weather statement, May 30, 5:56 PM CDT, 46 minutes before

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Local storm report, May 30, 6:08 PM CDT, 34 minutes before

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Local storm report, May 30, 6:14 PM CDT, 28 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 29, 8:55 PM CDT	Small Craft Advisory	LOT		24 hr
May 30, 4:09 AM CDT	Flash Flood Watch	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	66 hr
May 30, 2:00 PM CDT	Severe Thunderstorm Warning	LOT	Lee	60 min
May 30, 2:35 PM CDT	Special Marine Warning	LOT		85 min
May 30, 2:55 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston, Will	65 min
May 30, 2:56 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	34 min
May 30, 3:08 PM CDT	Special Marine Warning	LOT		97 min
May 30, 3:34 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	56 min
May 30, 3:59 PM CDT	Special Marine Warning	LOT		2 hr
May 30, 4:16 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Grundy, Kane, Kendall, LaSalle, Will	59 min
May 30, 4:22 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Will	3 hr
May 30, 4:28 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	47 min
May 30, 5:13 PM CDT	Areal Flood Advisory	LOT	Cook, Will	3 hr
May 30, 5:50 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Lee, Ogle, Winnebago	70 min
May 30, 5:56 PM CDT	Special Weather Statement	LOT	Ford, Iroquois	64 min
May 30, 6:09 PM CDT	Special Marine Warning	LOT		51 min
May 30, 2:28 PM CDT	Special Weather Statement	LOT	Lake	47 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2013 Every severe thunderstorm warning in 2013

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.