Alert archive / Illinois / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

September 20, 2021Bureau County, Putnam County, Illinois

NWS Quad Cities, IA issued this special weather statement at Sep 20, 2021, 10:34 PM CDT for Bureau County, Putnam County, Illinois. It was in force for 26 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: Sep 20, 2021, 10:34 PM CDT (03:34 UTC)
Expired: Sep 20, 2021, 11:00 PM CDT
In force: 26 min
Issued by: NWS Quad Cities, IA
Hail: 0.00 in
Wind: 40

Counties Bureau County, IL, Putnam County, IL

The radar

The Quad Cities radar (KDVN), 98 km from the middle of the area, began a volume at 03:37 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, 3.6 hours before the alert went out and 92 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: 1090 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1240 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.7

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 Sep 20, 8:47 PM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, Sep 20, 8:47 PM CDT, 1 hour 47 minutes before

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Hazardous weather outlook, Sep 20, 2:30 PM CDT, 8 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
230 PM CDT Mon Sep 20 2021

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-211930-
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-
230 PM CDT Mon Sep 20 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...THIS AFTERNOON AND TONIGHT

A Severe Thunderstorm Watch has been issued for much of eastern
Iowa through 10 PM. Thunderstorms associated with a strong cold
front will be capable of producing damaging wind gusts, a few
tornadoes, torrential rain and frequent lightning. Expect storms
to quickly move through eastern Iowa, northwest Illinois, and
northeast Missouri in the 6 PM to 10 PM timeframe.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening, especially in
eastern Iowa.

PS

In the hours before

Special weather statement, Sep 20, 9:00 PM CDT, 1 hour 34 minutes before

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Special weather statement, Sep 20, 9:37 PM CDT, 57 minutes before

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Local storm report, Sep 20, 10:11 PM CDT, 23 minutes before

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Local storm report, Sep 20, 10:23 PM CDT, 11 minutes before

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Local storm report, Sep 20, 10:33 PM CDT, 1 minute before

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Special weather statement, Sep 20, 10:34 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
Sep 20, 7:13 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Keokuk, Washington	47 min
Sep 20, 7:53 PM CDT	Special Weather Statement	DVN	Louisa	52 min
Sep 20, 8:52 PM CDT	Special Weather Statement	DVN	Scott	23 min
Sep 20, 9:00 PM CDT	Special Weather Statement	DVN	Henderson, Warren	45 min
Sep 20, 9:37 PM CDT	Special Weather Statement	DVN	Hancock, Henderson, Henry, McDonough, Warren	38 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.