Alert archive / Illinois / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

June 11, 2021Whiteside County, Illinois

NWS Quad Cities, IA issued this special weather statement at Jun 11, 2021, 4:19 PM CDT for Whiteside County, Illinois. It was in force for 41 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: Jun 11, 2021, 4:19 PM CDT (21:19 UTC)
Expired: Jun 11, 2021, 5:00 PM CDT
In force: 41 min
Issued by: NWS Quad Cities, IA

County Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 35 km from the middle of the area, began a volume at 21:20 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.3 hours before the alert went out and 29 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: 1156 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1370 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

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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 Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Jun 11, 2:53 PM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, Jun 11, 2:53 PM CDT, 1 hour 26 minutes before

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Hazardous weather outlook, Jun 11, 4:03 AM CDT, 12 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
403 AM CDT Fri Jun 11 2021

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-120915-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
403 AM CDT Fri Jun 11 2021

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...TODAY AND TONIGHT

There is a chance of thunderstorms this afternoon and tonight.
The main threats from any storms will be lightning, gusty winds,
and torrential downpours.

It will remain hot and humid today with afternoon heat indices
topping out in the mid 90s to near 100 degrees.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today or tonight.

In the hours before

Local storm report, Jun 11, 2:49 PM CDT, 1 hour 30 minutes before

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Local storm report, Jun 11, 2:50 PM CDT, 1 hour 29 minutes before

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Local storm report, Jun 11, 2:51 PM CDT, 1 hour 28 minutes before

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Local storm report, Jun 11, 4:00 PM CDT, 19 minutes before

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Local storm report, Jun 11, 4:02 PM CDT, 17 minutes before

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Special weather statement, Jun 11, 4:19 PM CDT, 0 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 2:18 PM CDT	Special Weather Statement	DVN	Des Moines	27 min
Jun 11, 2:33 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines	20 min
Jun 11, 2:26 PM CDT	Special Weather Statement	DVN	Rock Island	34 min
Jun 11, 2:38 PM CDT	Special Weather Statement	DVN	Stephenson	52 min

Nearby

Special Weather Statements in Illinois, 2021 Every special weather statement in 2021

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.