Alert archive / Illinois / Special Weather Statements in 2020

Special Weather Statement, NWS Quad Cities, IA

September 7, 2020Hancock County, Illinois

NWS Quad Cities, IA issued this special weather statement at Sep 7, 2020, 9:01 PM CDT for Hancock County, Illinois. It was in force for 44 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 7, 2020, 9:01 PM CDT (02:01 UTC)
Expired
Sep 7, 2020, 9:45 PM CDT
In force
44 min
Issued by
NWS Quad Cities, IA

County Hancock County, IL

The radar

The Quad Cities radar (KDVN), 140 km from the middle of the area, began a volume at 02:05 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 00:00Z, 2.0 hours before the alert went out and 233 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2020-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1489 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2020-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 146 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1489 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
1001 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
146 m²/s²
0-3 km storm-relative helicity
329 m²/s²
Significant tornado parameter
1.4
Supercell composite
10.5

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 7, 6:41 PM CDT, 2 hours 20 minutes earlier.

Area forecast discussion, Sep 7, 6:41 PM CDT, 2 hours 20 minutes before
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Hazardous weather outlook, Sep 7, 4:29 AM CDT, 16 hours 32 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
429 AM CDT Mon Sep 7 2020

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-080930-
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-
429 AM CDT Mon Sep 7 2020

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

Showers and thunderstorms are expected to develop across the
outlook area this evening lingering overnight. There is
a low risk of isolated large hail south of Interstate 80
this evening. Heavy rainfall of 1 to 3 inches is also possible
in some locations tonight into Tuesday morning. This could
pose a low risk for flash flooding in areas that received heavy
rainfall over the past 24 hours.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

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, Sep 7, 6:43 PM CDT, 2 hours 18 minutes before
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Special weather statement, Sep 7, 7:49 PM CDT, 1 hour 12 minutes before
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Special weather statement, Sep 7, 9:01 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.

IssuedProductOfficeCountiesLasted
Sep 7, 7:49 PM CDTSpecial Weather StatementDVNVan Buren41 min
Sep 7, 9:40 PM CDTSpecial Weather StatementDVNLouisa, Washington35 min
Sep 7, 10:49 PM CDTSpecial Weather StatementDVNScott26 min
Sep 8, 2:12 AM CDTSpecial Weather StatementDVNDes Moines33 min
Sep 8, 2:16 AM CDTSevere Thunderstorm WarningDVNDes Moines44 min
Sep 8, 3:31 AM CDTSpecial Weather StatementDVNScott29 min
Sep 7, 9:44 PM CDTSpecial Weather StatementDVNMcDonough46 min
Sep 7, 10:30 PM CDTSpecial Weather StatementDVNMcDonough45 min
Sep 8, 2:54 AM CDTSpecial Weather StatementDVNWarren36 min
Sep 7, 9:03 PM CDTSpecial Weather StatementDVNScotland42 min

Nearby

Special Weather Statements in Illinois, 2020Every special weather statement in 2020

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.