Alert archive / Illinois / Special Weather Statements in 2021

Special Weather Statement, NWS Chicago, IL

August 12, 2021Iroquois County, Illinois

NWS Chicago, IL issued this special weather statement at Aug 12, 2021, 1:09 PM CDT for Iroquois County, Illinois. It was in force for 51 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
Aug 12, 2021, 1:09 PM CDT (18:09 UTC)
Expired
Aug 12, 2021, 2:00 PM CDT
In force
51 min
Issued by
NWS Chicago, IL
Hail
0.00 in
Wind
40

County Iroquois County, IL

The radar

The Lincoln radar (KILX), 123 km from the middle of the area, began a volume at 18:11 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 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 Chicago, IL wrote its last area forecast discussion before this special weather statement went out at Aug 12, 11:48 AM CDT, 1 hour 21 minutes earlier.

Area forecast discussion, Aug 12, 11:48 AM CDT, 1 hour 21 minutes before
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Hazardous weather outlook, Aug 12, 4:42 AM CDT, 8 hours 27 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
442 AM CDT Thu Aug 12 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-130945-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
442 AM CDT Thu Aug 12 2021 /542 AM EDT Thu Aug 12 2021/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited hail risk...up to quarter size here.
     Limited damaging wind risk...up to 65 mph.
  Limited Flooding Risk.
  Elevated Excessive Heat Risk.

DISCUSSION...

Scattered thunderstorms may produce isolated damaging wind gusts
south of the Interstate 80 corridor early this morning, along with
locally heavy rainfall and possibly some flooding. Additional
scattered thunderstorms are possible late this afternoon into
tonight across the entire area. Some of these storms may be
severe, with damaging wind gusts the main threat, with the severe
threat decreasing late evening into the overnight.

Warm and humid conditions will persist today, though peak
afternoon heat indices should top out just under 105 degrees.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Limited Thunderstorm Risk.
Tuesday and Wednesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed late this afternoon and this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward east at 35 mph early this morning, and to the
  southeast at 35 mph later today and tonight.

LMZ740>745-130945-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
442 AM CDT Thu Aug 12 2021

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited Waterspout Risk.
     Limited hail risk...up to quarter size.
     Limited thunderstorm wind gust risk...up to 55 knots.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Limited Thunderstorm Risk.
Wednesday...
  Limited Thunderstorm Risk.

Ratzer

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In the hours before

Local storm report, Aug 12, 10:49 AM CDT, 2 hours 20 minutes before
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Local storm report, Aug 12, 11:01 AM CDT, 2 hours 8 minutes before
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Local storm report, Aug 12, 11:58 AM CDT, 1 hour 11 minutes before
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Special weather statement, Aug 12, 12:09 PM CDT, 1 hour before
Special Weather Statement
National Weather Service Chicago/Romeoville
1209 PM CDT Thu Aug 12 2021

ILZ019-032-121800-
Livingston IL-La Salle IL-
1209 PM CDT Thu Aug 12 2021

...Strong thunderstorms will impact portions of northern Livingston
and southern La Salle Counties through 100 PM CDT...

At 1209 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Wenona to Cornell to near Pontiac.
Movement was east at 30 mph.

HAZARD...Winds in excess of 30 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Streator, Pontiac, Dwight, Wenona, Odell, South Streator, Cornell,
Saunemin, Ransom, Kangley, Long Point, Dana and Emington.

Including the following interstates...
 I-39 near mile marker 41.
 I-55 between mile markers 193 and 216.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4077 8865 4093 8880 4093 8893 4104 8905
      4110 8905 4111 8916 4117 8866 4111 8858
      4111 8848 4097 8829 4076 8837
TIME...MOT...LOC 1709Z 273DEG 27KT 4107 8899 4099 8874 4085 8861

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...30 MPH

Carlaw
Local storm report, Aug 12, 12:52 PM CDT, 17 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1252 PM CDT THU AUG 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1251 PM     FLASH FLOOD      1 S GIBSON CITY         40.46N 88.38W
08/12/2021                   FORD               IL   EMERGENCY MNGR

            SIGNIFICANT FLASH FLOODING OCCURRING IN AND
            AROUND GIBSON CITY, AND POINTS SOUTH AND
            WEST. WATER IS INUNDATING HOMES AND
            BUSINESSES, SEWERS ARE BACKING UP, AND ALL
            ROADS ARE IMPASSABLE. NUMEROUS WATER RESCUES
            CONTINUE.

&&

BB
Special weather statement, Aug 12, 1:09 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
109 PM CDT Thu Aug 12 2021

ILZ033-039-121900-
Iroquois IL-Ford IL-
109 PM CDT Thu Aug 12 2021

...A strong thunderstorm will impact portions of southeastern Ford
and southern Iroquois Counties through 200 PM CDT...

At 108 PM CDT, Doppler radar was tracking a strong thunderstorm over
Paxton, moving east at 45 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Paxton, Loda, Wellington and Clarence.

Including the following interstate...
 I-57 between mile markers 258 and 268.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4054 8825 4058 8753 4049 8753 4049 8794
      4040 8793 4040 8827
TIME...MOT...LOC 1808Z 268DEG 41KT 4044 8814

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Carlaw

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 11, 8:57 PM CDTSevere Thunderstorm WarningLOTDuPage, Kane48 min
Aug 11, 9:43 PM CDTSevere Thunderstorm WarningLOTCook, DuPage26 min
Aug 12, 12:45 AM CDTSpecial Weather StatementLOTKendall45 min
Aug 12, 1:31 AM CDTSpecial Weather StatementLOTLivingston44 min
Aug 12, 2:13 AM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Kankakee, Livingston47 min
Aug 12, 2:22 AM CDTSpecial Weather StatementLOTWill38 min
Aug 12, 2:27 AM CDTSpecial Weather StatementLOTWill33 min
Aug 12, 2:30 AM CDTSevere Thunderstorm WarningLOTKankakee, Will29 min
Aug 12, 2:46 AM CDTSpecial Marine WarningLOT89 min
Aug 12, 2:50 AM CDTSpecial Weather StatementLOTLaSalle40 min
Aug 12, 2:55 AM CDTSevere Thunderstorm WarningLOTCook50 min
Aug 12, 3:02 AM CDTSevere Thunderstorm WarningLOTLaSalle43 min
Aug 12, 3:16 AM CDTSpecial Weather StatementLOTGrundy, Kendall, Will44 min
Aug 12, 3:43 AM CDTSpecial Weather StatementLOTDuPage, Kane, Kendall, Will47 min
Aug 12, 3:51 AM CDTSpecial Weather StatementLOTFord, Iroquois39 min
Aug 12, 4:59 AM CDTSpecial Weather StatementLOTLivingston31 min
Aug 12, 8:01 AM CDTSpecial Weather StatementLOTFord29 min
Aug 12, 8:22 AM CDTSevere Thunderstorm WarningLOTFord, Iroquois68 min
Aug 12, 9:27 AM CDTAreal Flood AdvisoryLOTFord2 hr
Aug 12, 9:30 AM CDTSpecial Weather StatementLOTFord45 min
Aug 12, 9:59 AM CDTFlash Flood WarningLOTFord5 hr
Aug 12, 12:01 PM CDTAreal Flood AdvisoryLOTFord4 hr
Aug 12, 12:09 PM CDTSpecial Weather StatementLOTLivingston51 min
Aug 12, 2:44 PM CDTSmall Craft AdvisoryLOT7 hr
Aug 12, 2:59 PM CDTAreal Flood WarningLOTFord19 hr
Aug 12, 2:43 AM CDTSpecial Weather StatementLOTLake47 min
Aug 12, 2:51 AM CDTSpecial Weather StatementLOTJasper, Lake, Newton, Porter54 min
Aug 12, 4:20 AM CDTSpecial Weather StatementLOTBenton, Newton40 min
Aug 12, 4:30 AM CDTSevere Thunderstorm WarningLOTJasper, Newton45 min

Nearby

Special Weather Statements in Illinois, 2021Every 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; radar from the NEXRAD Level II archive.