Alert archive / Illinois / Special Weather Statements in 2021

Special Weather Statement, NWS Chicago, IL

June 18, 2021Ford County, Iroquois County, Illinois; Benton County, Indiana

NWS Chicago, IL issued this special weather statement at Jun 18, 2021, 12:17 PM CDT for Ford County, Iroquois County, Illinois; Benton County, Indiana. It was in force for 73 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 18, 2021, 12:17 PM CDT (17:17 UTC)
Expired: Jun 18, 2021, 1:30 PM CDT
In force: 73 min
Issued by: NWS Chicago, IL

Counties Ford County, IL, Iroquois County, IL, Benton County, IN

The radar

The Chicago radar (KLOT), 108 km from the middle of the area, began a volume at 17:19 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 12:00Z, 5.3 hours before the alert went out and 94 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: 1125 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1976 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Chicago, IL wrote its last area forecast discussion before this special weather statement went out at Jun 18, 11:10 AM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jun 18, 11:10 AM CDT, 1 hour 7 minutes before

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Hazardous weather outlook, Jun 18, 3:30 AM CDT, 8 hours 47 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
330 AM CDT Fri Jun 18 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-190830-
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-
330 AM CDT Fri Jun 18 2021 /430 AM EDT Fri Jun 18 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 Tornado risk.
     Limited hail risk...up to quarter size.
     Elevated damaging wind risk...up to 60.
  Limited Excessive Heat Risk.

DISCUSSION...

Scattered thunderstorms will be possible early this morning,
mainly north of Interstate 80. Scattered thunderstorms will be
possible again this afternoon into tonight, mainly along and
south of Interstate 80. Some of these thunderstorms may become
severe.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
  Limited Severe Thunderstorm Risk.
Sunday...
  Elevated Thunderstorm Risk.
Monday...
  Limited Thunderstorm Risk.
  High Swim Risk.
Tuesday...
  High Swim Risk.
Thursday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon and tonight.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east southeast at 40 to 50 mph.

LMZ740>745-190830-
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-
330 AM CDT Fri Jun 18 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...

  Limited Thunderstorm Risk...with an associated:
     Limited hail risk...up to quarter size.
     Limited thunderstorm wind gust risk...up to 40 knots.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Sunday...
  Elevated Thunderstorm Risk.
Monday...
  Hazardous conditions for small craft are likely.
  Limited Thunderstorm Risk.
Tuesday...
  Hazardous conditions for small craft are likely.
Thursday...
  Limited Thunderstorm Risk.

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In the hours before

Special weather statement, Jun 18, 8:25 AM CDT, 3 hours 52 minutes before

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Special weather statement, Jun 18, 11:42 AM CDT, 35 minutes before

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Special weather statement, Jun 18, 12:17 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 2:41 AM CDT	Special Weather Statement	LOT	Boone, Winnebago	49 min
Jun 18, 3:34 AM CDT	Special Weather Statement	LOT	Boone, McHenry, Winnebago	41 min
Jun 18, 4:07 AM CDT	Special Weather Statement	LOT	Lake	23 min
Jun 18, 4:21 AM CDT	Special Marine Warning	LOT		54 min
Jun 18, 4:34 AM CDT	Special Weather Statement	LOT	Cook, DuPage	41 min
Jun 18, 4:42 AM CDT	Special Marine Warning	LOT		63 min
Jun 18, 5:07 AM CDT	Special Weather Statement	LOT	Will	53 min
Jun 18, 11:42 AM CDT	Special Weather Statement	LOT	Livingston	33 min

Nearby

Special Weather Statements in Illinois, 2021 Special Weather Statements in Indiana, 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.