Alert archive / Illinois / Special Marine Warnings in 2021

Special Marine Warning 39, NWS Chicago, IL

August 28, 2021

NWS Chicago, IL issued this special marine warning at Aug 28, 2021, 5:53 PM CDT. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 28, 2021, 5:53 PM CDT (22:53 UTC)
Expired
Aug 28, 2021, 6:20 PM CDT
In force
27 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
0.0 in
Wind
34.0 mph

What forecasters said that day

The local office's own words before this special marine warning 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 marine warning went out at Aug 28, 2:51 PM CDT, 3 hours 2 minutes earlier.

Area forecast discussion, Aug 28, 2:51 PM CDT, 3 hours 2 minutes before
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Hazardous weather outlook, Aug 28, 3:31 PM CDT, 2 hours 22 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
331 PM CDT Sat Aug 28 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-292045-
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-
331 PM CDT Sat Aug 28 2021 /431 PM EDT Sat Aug 28 2021/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.

DISCUSSION...

Isolated thunderstorms will continue through sunset. Severe weather
is not anticipated, but torrential downpours and localized strong
wind gusts will be possible with these storms.

Heat index values are expected to remain around 100 into early
evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Limited Afternoon Severe Thunderstorm Risk.
  Limited Flooding Risk.
  Limited Excessive Heat Risk.
Monday...
  Elevated Thunderstorm Risk.
Tuesday...
  Limited Thunderstorm Risk.

DISCUSSION:

Scattered thunderstorms are possible Sunday afternoon into
Sunday evening. A few of these storms may be severe, especially
across northeast Illinois and northwest Indiana. Locally heavy
rainfall will also be possible with these storms and this could
cause isolated instances of flooding.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east northeast at 10 to 15 mph.

LMZ740>745-292045-
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-
331 PM CDT Sat Aug 28 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...Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Limited Severe Thunderstorm Risk.
Monday...
  Limited Thunderstorm Risk.

KJB

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In the hours before

Special weather statement, Aug 28, 3:31 PM CDT, 2 hours 22 minutes before
SPECIAL WEATHER STATEMENT
National Weather Service Chicago/Romeoville IL
331 PM CDT Sat Aug 28 2021

ILZ003>006-008-010>013-019>021-023-103>108-INZ001-002-282345-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Northern Cook-Central Cook-
Southern Cook-Northern Will-Southern Will-Eastern Will-Lake IN-
Porter-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove,
Mundelein, Gurnee, Rochelle, Oregon, Byron, Dixon, DeKalb,
Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove,
Lombard, Carol Stream, Ottawa, Streator, La Salle, Mendota,
Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka,
Kankakee, Bourbonnais, Bradley, Evanston, Des Plaines,
Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn,
Oak Park, La Grange, Calumet City, Oak Forest, Lemont,
Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield,
Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone,
Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso,
and Chesterton
331 PM CDT Sat Aug 28 2021

...THUNDERSTORMS WITH GUSTY WINDS THIS AFTERNOON...

Widely scattered thunderstorms will continue developing across
northern Illinois and northwestern Indiana this afternoon. The
strongest thunderstorms will produce torrential downpours,
frequent lightning, and gusty winds strong enough to down small
tree limbs and tented structures. Many areas will stay dry,
however. Keep an eye to the sky, and move indoors if you hear
thunder.

Borchardt
Local storm report, Aug 28, 5:49 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
549 PM CDT SAT AUG 28 2021

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

0544 PM     TSTM WND GST     BATAVIA                 41.85N 88.31W
08/28/2021  M50 MPH          KANE               IL   CO-OP OBSERVER

&&

EL

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 4:16 PM CDTSpecial Marine WarningLOT59 min
Aug 28, 5:13 PM CDTSpecial Marine WarningLOT62 min
Aug 28, 5:26 PM CDTAreal Flood AdvisoryLOTBoone, McHenry2 hr

Nearby

Special Marine Warnings in Illinois, 2021Every special marine warning 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.