Alert archive / Illinois / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 34, NWS Chicago, IL

June 10, 2018Ford County, Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 10, 2018, 3:35 AM CDT for Ford County, Livingston 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 10, 2018, 3:35 AM CDT (08:35 UTC)
Expired: Jun 10, 2018, 4:15 AM CDT
In force: 40 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Ford County, IL, Livingston County, IL

The radar

The Chicago radar (KLOT), 99 km from the middle of the area, began a volume at 08:37 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, 8.6 hours before the alert went out and 68 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: 673 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1144 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 112 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 10, 2:41 AM CDT, 54 minutes earlier.

Area forecast discussion, Jun 10, 2:41 AM CDT, 54 minutes before

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Hazardous weather outlook, Jun 9, 3:57 PM CDT, 11 hours 38 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
357 PM CDT Sat Jun 9 2018

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
102100-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
357 PM CDT Sat Jun 9 2018 /457 PM EDT Sat Jun 9 2018/

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

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited hail risk...up to Quarter size.
     Elevated damaging wind risk...up to 60 mph.
  Limited Flooding Risk.
  Elevated Fog Risk.

DISCUSSION...

Some isolated to widely scattered thunderstorms will be possible
this evening. However, it appears the main threat for more
substantial thunderstorms will be in association with a complex
of thunderstorms expected to drop southeastward across eastern
Iowa and into portions of north central Illinois after midnight.
These storms will be capable of producing damaging wind gusts to
60 mph and possible hail to the size of quarters. Very heavy
rainfall will also accompany these storms and may result in some
flash flooding, especially over the areas that experienced heavy
rainfall Friday night. The highest threat of flash flooding and
possible severe storms currently appears to be along and west of
I-39, though some stronger storms could shift east of the area
towards morning.

Areas of fog, possibly dense at times, will be possible near Lake
Michigan.

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

Sunday...
  Limited Severe Thunderstorm Risk.
  Limited Flooding Risk.
Monday...
  Limited Severe Thunderstorm Risk.
Tuesday
  Limited Thunderstorm Risk.
Thursday through Friday...
  Limited Thunderstorm Risk.

DISCUSSION...

Showers and thunderstorms are expected to continue at times across
the area Sunday into Sunday night as an upper level disturbance
slowly shifts across the area. These storms will again be capable
of producing heavy rainfall and possible flash flooding. A few
strong storms with gusty winds and hail will also be possible,
especially to the south of I-80.

.SPOTTER INFORMATION STATEMENT...

 Spotters may be needed overnight.

GENERAL STORM MOTION OF THE DAY:

 Moving toward east southeast at 20 to 30 mph

LMZ740>745-102100-
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-
357 PM CDT Sat Jun 9 2018

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...This Afternoon and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk.
  Elevated Dense Fog Risk.

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

Sunday...
  Limited Severe Thunderstorm Risk.
  Elevated Dense Fog Risk in the morning.
Monday through Friday...
  Limited Thunderstorm Risk.

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-102100-
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 Holland to Whitehall MI 5 nm off shore to mid-
line of 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-
357 PM CDT Sat Jun 9 2018

This Hazardous Weather Outlook is for portions of the open waters
of Lake Michigan.

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk South.
  Elevated Dense Fog Risk South.

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

Sunday...
  Limited Severe Thunderstorm Risk South Lake.
  Elevated Dense Fog Risk South Lake in the morning.
Monday through Friday...
  Limited Thunderstorm Risk.

KJB

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In the hours before

Special weather statement, Jun 10, 1:04 AM CDT, 2 hours 31 minutes before

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Special weather statement, Jun 10, 1:10 AM CDT, 2 hours 25 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
110 AM CDT SUN JUN 10 2018

ILZ008-010-100645-
Ogle IL-Lee IL-
110 AM CDT SUN JUN 10 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN OGLE AND WESTERN LEE
COUNTIES UNTIL 145 AM CDT...

At 110 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Shannon to near Tampico. Movement was east
at 45 mph.

Wind gusts up to 50 mph will be possible with these storms.

Strong thunderstorms will be near...
  Polo and Forreston around 120 AM CDT.
  Mount Morris around 130 AM CDT.
  Dixon, Oregon and Walton around 135 AM CDT.

Other locations impacted by these storms include Nelson, Leaf River,
Harmon and Adeline.

A severe thunderstorm watch remains in effect until 200 AM CDT for
north central Illinois.

LAT...LON 4215 8969 4217 8929 4164 8941 4165 8963
      4193 8963 4193 8969
TIME...MOT...LOC 0610Z 265DEG 38KT 4209 8969 4171 8977

IZZI

Special weather statement, Jun 10, 1:56 AM CDT, 1 hour 39 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
156 AM CDT SUN JUN 10 2018

ILZ008-010-011-100715-
De Kalb IL-Ogle IL-Lee IL-
156 AM CDT SUN JUN 10 2018

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN OGLE...EASTERN LEE AND
WESTERN DE KALB COUNTIES UNTIL 215 AM CDT...

At 156 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Stillman Valley to near Rochelle to near
La Moille. Movement was east at 40 mph.

Wind gusts up to 50 mph will be possible with these storms.

Strong thunderstorms will be near...
  Rochelle and Hillcrest around 200 AM CDT.
  Shabbona, Kirkland and Malta around 215 AM CDT.

Other locations impacted by these storms include Compton, Creston,
Davis Junction, Sublette, West Brooklyn, Lee and Steward.

LAT...LON 4188 8920 4216 8923 4216 8917 4215 8917
      4215 8888 4182 8882 4163 8893 4162 8928
TIME...MOT...LOC 0656Z 280DEG 34KT 4215 8919 4188 8913 4161 8927

IZZI

Special weather statement, Jun 10, 2:23 AM CDT, 1 hour 12 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
223 AM CDT SUN JUN 10 2018

ILZ032-033-039-100745-
Livingston IL-Iroquois IL-Ford IL-
223 AM CDT SUN JUN 10 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LIVINGSTON...CENTRAL
FORD AND WEST CENTRAL IROQUOIS COUNTIES UNTIL 245 AM CDT...

At 222 AM CDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Piper City, moving east at 15 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

This storm will remain over mainly rural areas of southeastern
Livingston...central Ford and west central Iroquois Counties,
including the following locations: Roberts and Thawville.

LAT...LON 4062 8834 4075 8824 4071 8798 4052 8810
TIME...MOT...LOC 0722Z 290DEG 12KT 4065 8818

IZZI

Special weather statement, Jun 10, 3:22 AM CDT, 13 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
322 AM CDT SUN JUN 10 2018

ILZ032-100845-
Livingston IL-
322 AM CDT SUN JUN 10 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LIVINGSTON COUNTY UNTIL
345 AM CDT...

At 322 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles west of Odell to near Pontiac to near
Lexington. Movement was east at 35 mph.

Wind gusts up to 50 mph will be possible with these storms.

Strong thunderstorms will be near...
  Pontiac around 330 AM CDT.
  Fairbury and Odell around 340 AM CDT.

Other locations impacted by these storms include Cornell.

LAT...LON 4062 8858 4076 8858 4076 8879 4082 8875
      4105 8876 4104 8849 4082 8844 4062 8853
TIME...MOT...LOC 0822Z 273DEG 28KT 4099 8873 4083 8870 4069 8877

IZZI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 1:04 AM CDT	Special Weather Statement	LOT	Livingston	26 min
Jun 10, 1:10 AM CDT	Special Weather Statement	LOT	Ogle	35 min
Jun 10, 1:27 AM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	33 min
Jun 10, 1:37 AM CDT	Areal Flood Advisory	LOT	Ogle	3 hr
Jun 10, 1:56 AM CDT	Special Weather Statement	LOT	DeKalb	19 min
Jun 10, 2:23 AM CDT	Special Weather Statement	LOT	Ford	22 min
Jun 10, 2:35 AM CDT	Areal Flood Advisory	LOT	DeKalb, Ford, Grundy, LaSalle, Lee, Livingston	3 hr
Jun 10, 3:22 AM CDT	Special Weather Statement	LOT	Livingston	23 min
Jun 10, 9:23 AM CDT	River Flood Warning	LOT	Will	12 hr
Jun 10, 9:30 AM CDT	River Flood Advisory	LOT	Kane, Kendall, LaSalle	26 hr
Jun 10, 9:30 AM CDT	River Flood Advisory	LOT	LaSalle, Will	25 hr
Jun 10, 9:30 AM CDT	River Flood Advisory	LOT	Grundy	37 hr
Jun 10, 9:30 AM CDT	River Flood Advisory	LOT	Lake	8 hr
Jun 10, 11:31 AM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Livingston	3 hr
Jun 10, 1:03 PM CDT	River Flood Warning	LOT	Bureau, LaSalle, Putnam	19 hr
Jun 10, 2:51 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Livingston	6 hr
Jun 10, 3:53 PM CDT	Beach Hazards Statement	LOT	Lake	17 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2018 Every severe thunderstorm warning in 2018

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.