Alert archive / Illinois / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 43, NWS Chicago, IL

June 10, 2020Ogle County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 10, 2020, 2:23 AM CDT for Ogle County, Illinois. 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: Jun 10, 2020, 2:23 AM CDT (07:23 UTC)
Expired: Jun 10, 2020, 2:50 AM CDT
In force: 27 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Ogle County, IL

The radar

The Chicago radar (KLOT), 113 km from the middle of the area, began a volume at 07:23 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

Davenport, (KDVN), launched 00:00Z, 7.4 hours before the alert went out and 108 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: 104 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 582 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 260 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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, 12:59 AM CDT, 1 hour 24 minutes earlier.

Area forecast discussion, Jun 10, 12:59 AM CDT, 1 hour 24 minutes before

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Hazardous weather outlook, Jun 9, 3:59 PM CDT, 10 hours 24 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
359 PM CDT Tue Jun 9 2020

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-102100-
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-
359 PM CDT Tue Jun 9 2020 /459 PM EDT Tue Jun 9 2020/

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...with an associated:
     Elevated Tornado risk.
     Elevated damaging wind risk...up to 65 mph.
  Limited Flooding Risk.
  Elevated Non thunderstorm wind Risk.
  High Swim Risk through this evening.

DISCUSSION...

The remnants of Tropical Depression Cristobal will move across the
area through this evening. There is a chance for thunderstorms
that could pose a brief tornado or damaging wind threat both
through this afternoon and also later this evening into the
overnight hours. Showers with brief but torrential rains are
likely.

Outside of thunderstorms, southeast winds will gust 40 to 45 mph
this afternoon, shifting southwest tonight before diminishing.

Strong southeast winds this afternoon will create high waves on
Lake Michigan, producing dangerous swimming conditions as well as
the potential for minor lakeshore flooding along the Illinois
shore, mainly through this evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Limited Thunderstorm Risk mainly in the morning.
Saturday...
  High Swim Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotters activation is not expected...however reports of any
  severe weather would be appreciated.

GENERAL STORM MOTION OF THE DAY:

 Moving toward the north at 50 mph this afternoon and towards the
 northeast tonight.

LMZ740>745-102100-
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-
359 PM CDT Tue Jun 9 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...

  Gale force winds and or very hazardous waves.
  Limited Thunderstorm Risk...with an associated:
     Elevated Waterspout Risk.
     Elevated thunderstorm wind gust risk...up to 50 kt.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Hazardous conditions for small craft are likely.
  Limited Thunderstorm Risk.
Saturday...
  Hazardous conditions for small craft are likely.

Carlaw

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In the hours before

Local storm report, Jun 9, 8:43 PM CDT, 5 hours 40 minutes before

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Local storm report, Jun 9, 11:25 PM CDT, 2 hours 58 minutes before

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Local storm report, Jun 9, 11:26 PM CDT, 2 hours 57 minutes before

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Local storm report, Jun 9, 11:42 PM CDT, 2 hours 41 minutes before

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Local storm report, Jun 9, 11:43 PM CDT, 2 hours 40 minutes before

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Special weather statement, Jun 10, 2:12 AM CDT, 11 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 9, 7:13 PM CDT	Tornado Warning	LOT	Will	47 min
Jun 9, 7:25 PM CDT	Special Marine Warning	LOT		95 min
Jun 9, 7:25 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	50 min
Jun 9, 7:47 PM CDT	Tornado Warning	LOT	Cook	18 min
Jun 9, 8:54 PM CDT	Special Marine Warning	LOT		96 min
Jun 10, 1:02 AM CDT	Small Craft Advisory	LOT		14 hr
Jun 10, 2:12 AM CDT	Special Weather Statement	LOT	Ogle	48 min
Jun 10, 2:40 AM CDT	Special Weather Statement	LOT	Winnebago	50 min
Jun 10, 7:29 AM CDT	Special Weather Statement	LOT	Ford	16 min
Jun 10, 7:47 AM CDT	Special Weather Statement	LOT	Ford	13 min
Jun 10, 8:01 AM CDT	Special Weather Statement	LOT	Kankakee, Will	29 min
Jun 10, 8:14 AM CDT	Severe Thunderstorm Warning	LOT	Cook, Kankakee, Will	76 min
Jun 10, 8:17 AM CDT	Special Marine Warning	LOT		3 hr
Jun 10, 9:00 AM CDT	Special Weather Statement	LOT	Iroquois	30 min
Jun 10, 9:35 AM CDT	Areal Flood Advisory	LOT	Cook	115 min
Jun 10, 2:40 PM CDT	Gale Warning	LOT		7 hr
Jun 10, 2:40 PM CDT	Small Craft Advisory	LOT		13 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2020 Every severe thunderstorm warning in 2020

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.