Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 54, NWS Chicago, IL

May 21, 2014Ford County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at May 21, 2014, 3:26 PM CDT for Ford County, Illinois. It was in force for 64 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 21, 2014, 3:26 PM CDT (20:26 UTC)
Expired: May 21, 2014, 4:30 PM CDT
In force: 64 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Ford County, IL

The radar

The Lincoln radar (KILX), 107 km from the middle of the area, began a volume at 20:25 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

Lincoln, IL (KILX), launched 12:00Z, 8.4 hours before the alert went out and 59 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: 806 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1032 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 21, 2:53 PM CDT, 33 minutes earlier.

Area forecast discussion, May 21, 2:53 PM CDT, 33 minutes before

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Hazardous weather outlook, May 21, 10:51 AM CDT, 4 hours 35 minutes before

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In the hours before

Special weather statement, May 21, 3:23 PM CDT, 3 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 20, 7:11 PM CDT	Special Marine Warning	LOT		3 hr
May 20, 7:14 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall	46 min
May 20, 7:20 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	55 min
May 20, 7:23 PM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	52 min
May 20, 7:40 PM CDT	Severe Thunderstorm Warning	LOT	DuPage, Kane, Kendall, Will	50 min
May 20, 8:03 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Kane	6 hr
May 20, 8:10 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	65 min
May 20, 8:32 PM CDT	Flash Flood Warning	LOT	Cook, DuPage	3 hr
May 20, 9:05 PM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	55 min
May 20, 9:11 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	79 min
May 20, 9:16 PM CDT	Areal Flood Advisory	LOT	Cook, Will	6 hr
May 20, 9:33 PM CDT	Flash Flood Warning	LOT	Cook	6 hr
May 20, 9:51 PM CDT	River Flood Advisory	LOT	Lake	49 hr
May 20, 10:03 PM CDT	Special Weather Statement	LOT	Winnebago	27 min
May 20, 10:05 PM CDT	River Flood Warning	LOT	Kane, Kendall	63 hr
May 20, 10:05 PM CDT	Special Weather Statement	LOT	Cook	25 min
May 20, 10:13 PM CDT	Severe Thunderstorm Warning	LOT	Ogle	47 min
May 20, 10:21 PM CDT	River Flood Warning	LOT	Will	28 hr
May 20, 10:32 PM CDT	Special Weather Statement	LOT	Cook	13 min
May 20, 10:34 PM CDT	Special Marine Warning	LOT		116 min
May 20, 10:57 PM CDT	Special Weather Statement	LOT	McHenry	33 min
May 20, 11:36 PM CDT	Special Weather Statement	LOT	Cook	24 min
May 20, 11:59 PM CDT	Special Marine Warning	LOT		61 min
May 21, 3:01 AM CDT	Marine Dense Fog Advisory	LOT		12 hr
May 21, 3:46 AM CDT	Special Weather Statement	LOT	Lee	29 min
May 21, 4:12 AM CDT	Special Weather Statement	LOT	LaSalle	33 min
May 21, 4:37 AM CDT	Special Weather Statement	LOT	Kendall	38 min
May 21, 9:12 AM CDT	Dense Fog Advisory	LOT	Lake	3 hr
May 21, 9:39 AM CDT	River Flood Advisory	LOT	Kane, Kendall	3 days
May 21, 3:23 PM CDT	Special Weather Statement	LOT	Ford	22 min
May 20, 10:10 PM CDT	Severe Thunderstorm Warning	LOT	Porter	65 min
May 20, 10:54 PM CDT	River Flood Advisory	LOT	Lake	36 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Every severe thunderstorm warning in 2014

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.