Severe Thunderstorm Warning 55, NWS Chicago, IL

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Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
343 PM CDT Fri Jun 26 2020

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-272045-
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-
343 PM CDT Fri Jun 26 2020 /443 PM EDT Fri Jun 26 2020/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Significant damaging wind risk...up to 70 mph.
     Elevated hail risk...up to the size of quarters.
     Elevated Tornado risk.
  Limited Flooding Risk...mainly along and north of I-80.

DISCUSSION...

Scattered thunderstorms will gradually increase in coverage
through early evening peaking throughout the evening hours and
then gradually working southward and fading into the overnight.
Damaging wind gusts will be the main threat, but a risk for a
few brief tornadoes exists as well. A threat for flash flooding
also is present, mainly north of I-80. Thunderstorms will slowly
sink southeastward into the overnight with likely a weakening
trend.

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

Saturday...
  Limited Severe Thunderstorm Risk.
  Limited Flooding Risk.
Sunday...
  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.
Wednesday and Thursday...
  Limited Thunderstorm Risk.

DISCUSSION:

Scattered thunderstorms are possible on Saturday with the greatest
coverage along and south of I-80. Some of these may produce
locally heavy rainfall and gusty downburst winds. A continued
chance for storms will persist into Sunday.

Another round of thunderstorms may develop very late Sunday night
into Monday morning. Thereafter, a daily chance for mainly
isolated to widely scattered thunderstorms exists through
Thursday.

Heat index values will likely to rise above 95 on Monday and
Tuesday away from the lake.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation is requested through mid evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east at 40 to 45 mph.

LMZ740>745-272045-
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-
343 PM CDT Fri Jun 26 2020

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...

  Hazardous conditions for small craft.
  Significant Thunderstorm Risk...with an associated:
     Significant Thunderstorm Wind Gust Risk...up to 60 knots.
     Elevated Hail Risk...up to the size of quarters.
     Elevated Waterspout Risk.

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

Saturday through Thursday...
  Limited Thunderstorm Risk.

MTF

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Special Weather Statement
National Weather Service Chicago/Romeoville
222 PM CDT Fri Jun 26 2020

ILZ004-005-011-012-261945-
Kane IL-Boone IL-De Kalb IL-McHenry IL-
222 PM CDT Fri Jun 26 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DE KALB...WEST
CENTRAL KANE...SOUTHWESTERN MCHENRY AND SOUTHEASTERN BOONE COUNTIES
UNTIL 245 PM CDT...

At 222 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Belvidere to near Sycamore. Movement was
east at 35 mph.

Nickel size hail will be possible with these storms.

Locations impacted include...
Sycamore, Genoa, Kingston and Burlington.

Including the following interstate...
 I-90 between mile markers 26 and 33.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
north central and northeastern Illinois.

LAT...LON 4227 8873 4201 8850 4197 8868 4219 8891
TIME...MOT...LOC 1922Z 260DEG 32KT 4220 8885 4201 8867

IZZI

Special Weather Statement
National Weather Service Chicago/Romeoville
244 PM CDT Fri Jun 26 2020

ILZ005-012-103-262000-
Kane IL-McHenry IL-Northern Cook IL-
244 PM CDT Fri Jun 26 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN KANE...SOUTHERN MCHENRY
AND NORTHWESTERN COOK COUNTIES UNTIL 300 PM CDT...

At 244 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Marengo to near Gilberts. Movement was east at
50 mph.

Nickel size hail will be possible with these storms.

Strong thunderstorms will be near...
  Elgin, Sleepy Hollow, West Dundee and Gilberts around 250 PM CDT.
  Carpentersville, East Dundee and Lakewood around 255 PM CDT.
  Hoffman Estates, Algonquin, Lake In The Hills, Oakwood Hills,
  Prairie Grove and Trout Valley around 300 PM CDT.

Other locations impacted by these storms include Fox River Grove,
Crystal Lake, Cary, Barrington Hills, Pingree Grove, Union and South
Barrington.

Including the following interstate...
 I-90 between mile markers 38 and 62.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern Illinois.

LAT...LON 4227 8826 4206 8814 4201 8850 4223 8863
TIME...MOT...LOC 1944Z 260DEG 43KT 4224 8857 4205 8840

IZZI

Special Weather Statement
National Weather Service Chicago/Romeoville
508 PM CDT Fri Jun 26 2020

ILZ008-010-262230-
Ogle IL-Lee IL-
508 PM CDT Fri Jun 26 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LEE AND SOUTHWESTERN
OGLE COUNTIES UNTIL 530 PM CDT...

At 508 PM CDT, Doppler radar was tracking a strong thunderstorm near
Dixon, moving east at 45 mph.

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

This strong thunderstorm will be near...
  Franklin Grove around 520 PM CDT.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
north central Illinois.

LAT...LON 4185 8955 4197 8957 4199 8929 4184 8929
TIME...MOT...LOC 2208Z 259DEG 38KT 4191 8949

IZZI