Alert archive / Illinois / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 68, NWS Chicago, IL

June 22, 2013Ford County, Iroquois County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 22, 2013, 11:19 AM CDT for Ford County, Iroquois County, Illinois. It was in force for 56 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 22, 2013, 11:19 AM CDT (16:19 UTC)
Expired: Jun 22, 2013, 12:15 PM CDT
In force: 56 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Ford County, IL, Iroquois County, IL

The radar

The Chicago radar (KLOT), 104 km from the middle of the area, began a volume at 16:20 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.

What was reported inside it

Time	Report	Where	Remark
Jun 22, 11:22 AM CDT	HAIL 0.75	Gibson City, IL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 4.3 hours before the alert went out and 76 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: 2564 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jun 22, 9:28 AM CDT, 1 hour 51 minutes earlier.

Area forecast discussion, Jun 22, 9:28 AM CDT, 1 hour 51 minutes before

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Hazardous weather outlook, Jun 22, 4:11 AM CDT, 7 hours 8 minutes before

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In the hours before

Special weather statement, Jun 22, 9:21 AM CDT, 1 hour 58 minutes before

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Local storm report, Jun 22, 11:08 AM CDT, 11 minutes before

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Special weather statement, Jun 22, 11:09 AM CDT, 10 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
Jun 22, 2:23 AM CDT	Special Weather Statement	LOT	DeKalb, DuPage, Kane	37 min
Jun 22, 5:05 AM CDT	Areal Flood Advisory	LOT	Lee, Ogle, Winnebago	5 hr
Jun 22, 9:21 AM CDT	Special Weather Statement	LOT	Boone, Ogle, Winnebago	54 min
Jun 22, 10:42 AM CDT	Flash Flood Warning	LOT	Ford, Iroquois, Livingston	6 hr
Jun 22, 11:09 AM CDT	Special Weather Statement	LOT	Ford	51 min
Jun 22, 12:07 PM CDT	River Flood Advisory	LOT	Winnebago	8 hr
Jun 22, 12:07 PM CDT	River Flood Advisory	LOT	Winnebago	8 hr
Jun 22, 12:07 PM CDT	River Flood Advisory	LOT	Ogle	8 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.