Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 73, NWS Chicago, IL

June 14, 2017Iroquois County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 14, 2017, 2:50 PM CDT for Iroquois County, Illinois. It was in force for 40 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: Jun 14, 2017, 2:50 PM CDT (19:50 UTC)
Expired: Jun 14, 2017, 3:30 PM CDT
In force: 40 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Iroquois County, IL

The radar

The Chicago radar (KLOT), 98 km from the middle of the area, began a volume at 19:49 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 14, 12:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 93 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: 971 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jun 14, 2:49 PM CDT, 1 minute earlier.

Area forecast discussion, Jun 14, 2:49 PM CDT, 1 minute before

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Hazardous weather outlook, Jun 14, 12:16 PM CDT, 2 hours 34 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1216 PM CDT Wed Jun 14 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
151730-
Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane-
DuPage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston-
Iroquois-Ford-Lake Indiana-Porter-Newton-Jasper-Benton-
1216 PM CDT Wed Jun 14 2017 /116 PM EDT Wed Jun 14 2017/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...This Afternoon and Tonight.

WEATHER HAZARDS EXPECTED:
  Elevated Thunderstorm Risk...with an associated:
    Limited Tornado Risk.
    Elevated Hail Risk...up to half dollar size.
    Elevated Thunderstorm Wind Damage Risk...up to 65 MPH.
    Elevated Flooding Risk. Limited Excessive Heat Risk.

DISCUSSION:

Thunderstorm development will continue through the afternoon.
Thunderstorms are likely to be scattered to numerous in coverage,
with a couple periods likely in the afternoon into evening. There is
fairly high uncertainty though on the precise evolution and thus the
coverage of a severe weather threat but development of clusters of
thunderstorms may be favored.

Those storms that do reach severe limits will be capable of
large hail, strong winds, and possible flooding. There is a limited risk
for an isolated tornado. Locations that received the heaviest rainfall
on Tuesday will have a particularly elevated risk of flooding if they
receive heavy rainfall today.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Limited Thunderstorm Risk.
Friday...
  Limited Severe Thunderstorm Risk.
Saturday and Sunday...
  Limited Thunderstorm Risk.
Tuesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

Spotters will likely be needed this afternoon|.

GENERAL STORM MOTION OF THE DAY:

Moving to the east and northeast 30 to 35 mph.

&&

LMZ740>745-151730-
Winthrop Harbor to Wilmette Harbor-
Wilmette Harbor to Northerly Island-
Northerly Island to Calumet Harbor-Calumet Harbor to Gary-
Gary to Burns Harbor-Burns Harbor to Michigan City-
1216 PM CDT Wed Jun 14 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...This Afternoon and Tonight.

  Elevated Thunderstorm Risk.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday through Saturday...
  Limited Thunderstorm Risk.
Sunday...
  Limited Thunderstorm Risk.
  Hazardous Conditions for Small Craft are likely.
Tuesday...
  Limited Thunderstorm Risk.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-151730-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and north of a line from Charlevoix MI to South
Fox Island 5 NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to
Mid Lake-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to
Mid Lake-
Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5 NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5 NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM
offshore to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid
Lake-
Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
1216 PM CDT Wed Jun 14 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...This Afternoon and Tonight.

Elevated Thunderstorm Risk, with some storms capable of wind
gusts
in excess of 35 knots.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

There is a chance of thunderstorms Thursday morning, then
periodic
chances Friday through early Sunday, before chances return again
Tuesday.

&&

MDB

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In the hours before

Local storm report, Jun 14, 1:11 PM CDT, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
111 PM CDT WED JUN 14 2017

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

0103 PM     HAIL             1 NNE BELVIDERE         42.26N 88.84W
06/14/2017  E1.25 INCH       BOONE              IL   BROADCAST MEDIA

            NEAR STATE ST.

&&

EP

Local storm report, Jun 14, 1:13 PM CDT, 1 hour 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
113 PM CDT WED JUN 14 2017

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

0107 PM     FLOOD            1 NW BELVIDERE          42.26N 88.86W
06/14/2017                   BOONE              IL   LAW ENFORCEMENT

            OFFICER REPORTED ABOUT 1 FOOT OF WATER AT GARDEN DRIVE
            AND RUBY STREET.

&&

EP

Local storm report, Jun 14, 1:19 PM CDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
119 PM CDT WED JUN 14 2017

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

0100 PM     HAIL             NW BELVIDERE            42.26N 88.86W
06/14/2017  E1.00 INCH       BOONE              IL   PUBLIC

            1 INCH HAIL REPORTED NEAR THE WILLIAM GRADY POOL.

&&

EP

Local storm report, Jun 14, 1:36 PM CDT, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
136 PM CDT WED JUN 14 2017

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

0101 PM     HAIL             1 NE BELVIDERE          42.26N 88.84W
06/14/2017  E1.00 INCH       BOONE              IL   PUBLIC

            1 INCH HAIL REPORTED NEAR NORTH STATE STREET.

&&

EP

Local storm report, Jun 14, 2:00 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
200 PM CDT WED JUN 14 2017

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

0145 PM     TSTM WND DMG     4 SW WONDER LAKE        42.33N 88.41W
06/14/2017                   MCHENRY            IL   EMERGENCY MNGR

            MULTIPLE TREES DOWN NEAR WOODSTOCK AND WONDER LAKE. TREE
            BLOCKING ROAD AT BANFORD AND QUEEN ANNE IN WOODSTOCK AND
            ON THOMPSON NORTH OF ROUTE 120 IN WONDER LAKE.

&&

RC

Local storm report, Jun 14, 2:03 PM CDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
203 PM CDT WED JUN 14 2017

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

0156 PM     HAIL             WOODSTOCK               42.31N 88.44W
06/14/2017  E0.75 INCH       MCHENRY            IL   TRAINED SPOTTER

            DIME SIZED HAIL REPORTED A HALF MILE SOUTH OF ROUTE 14,
            ON DEAN STREET.

&&

EP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 7:49 PM CDT	Special Weather Statement	LOT	Livingston	26 min
Jun 13, 8:03 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Livingston	117 min
Jun 14, 12:15 AM CDT	Areal Flood Warning	LOT	Iroquois	9 hr
Jun 14, 12:11 PM CDT	Severe Thunderstorm Warning	LOT	Boone, McHenry, Winnebago	49 min
Jun 14, 12:43 PM CDT	Special Weather Statement	LOT	Cook	32 min
Jun 14, 12:47 PM CDT	Severe Thunderstorm Warning	LOT	Boone, McHenry	43 min
Jun 14, 1:11 PM CDT	Areal Flood Advisory	LOT	Boone, McHenry	3 hr
Jun 14, 1:14 PM CDT	Special Marine Warning	LOT		61 min
Jun 14, 1:28 PM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	47 min
Jun 14, 1:31 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kankakee, Livingston	44 min
Jun 14, 2:10 PM CDT	Areal Flood Advisory	LOT	Lake, McHenry	3 hr
Jun 14, 2:19 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	3 hr
Jun 14, 2:29 PM CDT	Severe Thunderstorm Warning	LOT	Cook	32 min
Jun 14, 2:38 PM CDT	Special Marine Warning	LOT		82 min
Jun 14, 2:40 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois	50 min
Jun 14, 2:40 PM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	35 min
Jun 14, 3:08 PM CDT	Areal Flood Advisory	LOT	Lake	3 hr
Jun 14, 3:11 PM CDT	Areal Flood Advisory	LOT	DeKalb	3 hr
Jun 14, 3:16 PM CDT	Areal Flood Advisory	LOT	Iroquois	3 hr
Jun 14, 3:34 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Kane, Lake, McHenry	31 min
Jun 14, 3:55 PM CDT	Special Marine Warning	LOT		95 min
Jun 14, 4:07 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Livingston	38 min
Jun 14, 4:36 PM CDT	Areal Flood Advisory	LOT	Boone, Cook, DeKalb, Kane, Lake, McHenry and 1 more	3 hr
Jun 14, 4:36 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall, LaSalle	39 min
Jun 14, 4:39 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kankakee, Kendall, LaSalle, Livingston, Will	36 min
Jun 14, 5:03 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Kane, Kendall, Will	42 min
Jun 14, 5:13 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	35 min
Jun 14, 5:23 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois	38 min
Jun 14, 5:28 PM CDT	Special Marine Warning	LOT		92 min
Jun 14, 5:56 PM CDT	Areal Flood Warning	LOT	Boone, DeKalb, Kane, McHenry	6 hr
Jun 14, 6:16 PM CDT	Areal Flood Warning	LOT	Iroquois	6 hr
Jun 14, 2:43 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Newton	47 min
Jun 14, 3:34 PM CDT	Severe Thunderstorm Warning	LOT	Jasper	41 min
Jun 14, 3:41 PM CDT	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	64 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 Every severe thunderstorm warning in 2017

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.