Alert archive / Illinois / Special Weather Statements in 2011

Special Weather Statement, NWS Chicago, IL

March 22, 2011Grundy County, Illinois

NWS Chicago, IL issued this special weather statement at Mar 22, 2011, 2:39 AM CDT for Grundy County, Illinois. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 22, 2011, 2:39 AM CDT (07:39 UTC)
Expired: Mar 22, 2011, 3:15 AM CDT
In force: 36 min
Issued by: NWS Chicago, IL

County Grundy County, IL

The radar

The Chicago radar (KLOT), 20 km from the middle of the area, began a volume at 07:42 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 00:00Z, 7.7 hours before the alert went out and 188 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: 3088 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Mar 21, 6:59 PM CDT, 7 hours 40 minutes earlier.

Area forecast discussion, Mar 21, 6:59 PM CDT, 7 hours 40 minutes before

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Hazardous weather outlook, Mar 21, 4:09 PM CDT, 10 hours 30 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
Mar 22, 12:55 AM CDT	Special Weather Statement	LOT	Lee	65 min
Mar 22, 4:49 AM CDT	River Flood Watch	LOT	Winnebago	29 hr
Mar 22, 4:49 AM CDT	River Flood Watch	LOT	Winnebago	5 hr
Mar 22, 10:35 AM CDT	River Flood Watch	LOT	Kane, McHenry	24 hr

Nearby

Special Weather Statements in Illinois, 2011 Every special weather statement in 2011

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.