Alert archive / Indiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 41, NWS Chicago, IL

July 5, 2018Lake County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jul 5, 2018, 3:10 PM CDT for Lake County, Indiana. It was in force for 36 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: Jul 5, 2018, 3:10 PM CDT (20:10 UTC)
Expired: Jul 5, 2018, 3:46 PM CDT
In force: 36 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Lake County, IN

The radar

The Chicago radar (KLOT), 61 km from the middle of the area, began a volume at 20:13 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, 8.2 hours before the alert went out and 179 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: 2343 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1116 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 38 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 Jul 5, 2:33 PM CDT, 37 minutes earlier.

Area forecast discussion, Jul 5, 2:33 PM CDT, 37 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Jul 5, 12:36 PM CDT, 2 hours 34 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1236 PM CDT Thu Jul 5 2018

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
061745-
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-
1236 PM CDT Thu Jul 5 2018 /136 PM EDT Thu Jul 5 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 damaging wind risk...up to 60 mph.
     Limited Flooding Risk.
     Limited hail risk...isolated up to nickel to quarter size.
  Significant Excessive heat Risk.

DISCUSSION...

Periods of thunderstorms will occur today and into early to mid
evening. Storms are likely to have at least 30 to 35 mph gusts,
and some stronger storms could have 45 to 60 mph gusts. Also,
storms are likely to have brief heavy rain that could lead to
flash flooding, particularly south of the Illinois and Kankakee
rivers. Finally, while large hail is not expected to be a
significant risk, can't rule out isolated marginally severe
hail from the strongest thunderstorms, especially along and south
of I-80.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  High Swim Risk
Tuesday and Wednesday...
  Limited Excessive Heat Risk.

DISCUSSION:

High waves could lead to dangerous swimming conditions on Lake
Michigan beaches Friday morning, and possibly continuing along
Indiana beaches into the afternoon.

.SPOTTER INFORMATION STATEMENT...

 Spotters activation is unlikely today.

GENERAL STORM MOTION OF THE DAY:

 Moving toward east southeast at 20 mph.

LMZ740>745-061745-
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-
1236 PM CDT Thu Jul 5 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...

 Limited Thunderstorm Risk...with an associated:
    Limited thunderstorm wind gust risk...up to 50 knots.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Winds and waves could approach small craft advisory criteria
Friday morning.

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-061745-
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-
1236 PM CDT Thu Jul 5 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...with an associated:
 Limited thunderstorm wind gust risk...up to 50 knots.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Monday through Wednesday...
  Limited Thunderstorm Risk mainly across the north.

RC

Visit us at http://weather.gov/chicago

Follow us on Facebook, Twitter, and Youtube at:
www.facebook.com/nwschicago
www.twitter.com/nwschicago
www.youtube.com/nwschicago

In the hours before

Special weather statement, Jul 5, 12:00 PM CDT, 3 hours 10 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
1200 PM CDT THU JUL 5 2018

ILZ010-019-051730-
La Salle IL-Lee IL-
1200 PM CDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LA SALLE AND
SOUTHEASTERN LEE COUNTIES UNTIL 1230 PM CDT...

At 1159 AM CDT, Doppler radar was tracking a strong thunderstorm near
Mendota, moving east at 15 to 20 mph.

Dime size hail and winds in of 40 to 50 mph will be possible with
this storm.

Locations impacted include...
Mendota, Paw Paw, Sublette, Compton, Troy Grove and West Brooklyn.

Including the following interstate...
 I-39 between mile markers 69 and 82.

This includes...  Tri-County Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4172 8926 4169 8896 4143 8909 4146 8917
      4158 8917 4158 8936
TIME...MOT...LOC 1659Z 285DEG 18KT 4162 8921

BIRK

Special weather statement, Jul 5, 1:42 PM CDT, 1 hour 28 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
142 PM CDT THU JUL 5 2018

ILZ013-014-020-022-051915-
Cook IL-DuPage IL-Will IL-Kendall IL-
142 PM CDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL KENDALL...
NORTHWESTERN WILL...SOUTHEASTERN DUPAGE AND CENTRAL COOK COUNTIES
UNTIL 215 PM CDT...

At 142 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Bolingbrook to Shorewood. Movement was
southeast at 20 mph.

Wind gusts up to 55 mph will be possible with these storms.

Locations impacted include...
Joliet, Naperville, Bolingbrook, Romeoville, Plainfield, Lockport,
New Lenox, Homer Glen, Lemont, Channahon, Burr Ridge, Willow Springs,
Ingalls Park, Woodridge, Darien, Palos Hills, Shorewood, Elwood,
Rockdale and Goodings Grove.

Including the following interstates...
 I-55 between mile markers 247 and 272.
 I-80 between mile markers 124 and 136.
 I-355 between mile markers 2 and 14.

This includes...  Argonne National Laboratory, University of St.
Francis, Joliet Junior College, Joliet Slammers Baseball, and Lewis
University.

LAT...LON 4170 8784 4139 8814 4153 8831 4174 8816
      4174 8803
TIME...MOT...LOC 1842Z 313DEG 18KT 4172 8807 4152 8823

BIRK

Local storm report, Jul 5, 1:43 PM CDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
143 PM CDT THU JUL 5 2018

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

0135 PM     TSTM WND GST     NAPERVILLE              41.76N 88.15W
07/05/2018  E50 MPH          DUPAGE             IL   NWS EMPLOYEE

&&

ACS

Local storm report, Jul 5, 2:03 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
203 PM CDT THU JUL 5 2018

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

0148 PM     TSTM WND DMG     WESTMONT                41.80N 87.97W
07/05/2018                   DUPAGE             IL   PUBLIC

            FAIRVIEW DR AND 63RD ST. TREE BRANCH OF 6-7 INCHES IN
            DIAMETER DOWN.

&&

ACS

Special weather statement, Jul 5, 2:18 PM CDT, 52 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
218 PM CDT THU JUL 5 2018

ILZ014-022-INZ001-051945-
Cook IL-Will IL-Lake IN-
218 PM CDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WILL...SOUTHEASTERN COOK
AND NORTHWESTERN LAKE COUNTIES UNTIL 245 PM CDT...

At 217 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Evergreen Park to Mokena. Movement was east at
30 mph.

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

Locations impacted include...
Chicago, Hammond, Orland Park, Tinley Park, Oak Lawn, Calumet City,
Chicago Heights, East Chicago, Lansing, New Lenox, Blue Island,
Munster, Dolton, Park Forest, Alsip, Matteson, Mokena, Frankfort,
Midlothian and Chatham.

Including the following interstates...
 I-57 between mile markers 332 and 358.
 I-80 between mile markers 144 and 155.
 I-94 between mile markers 59 and 74.
 I-294 between mile markers 59 and 74.
 Indiana I-80 near mile marker 1.
 Indiana I-90 between mile markers 1 and 8.

This includes...  Windy City Thunderbolts Baseball, First Midwest
Bank Amphitheatre, Governors State University, Prairie State College,
and South Suburban College.

LAT...LON 4165 8744 4164 8742 4137 8775 4148 8798
      4178 8766 4178 8756 4176 8756 4176 8754
      4175 8753 4171 8753 4167 8747 4168 8746
      4167 8744 4168 8743 4167 8742
TIME...MOT...LOC 1917Z 291DEG 26KT 4172 8770 4153 8790

BIRK

Special weather statement, Jul 5, 2:41 PM CDT, 29 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
241 PM CDT THU JUL 5 2018

ILZ014-022-INZ001-052015-
Cook IL-Will IL-Lake IN-
241 PM CDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL WILL...SOUTHEASTERN
COOK AND LAKE COUNTIES UNTIL 315 PM CDT...

At 241 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near East Chicago to near Griffith to near
Beecher. Movement was southeast at 20 mph.

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

Locations impacted include...
Hammond, Gary, Calumet City, Portage, Merrillville, Chicago Heights,
East Chicago, Schererville, Hobart, Lansing, Crown Point, Highland,
Munster, Park Forest, Griffith, St. John, Lake Station, Cedar Lake,
Steger and Glenwood.

Including the following interstates...
 I-57 near mile marker 332.
 Indiana I-80 between mile markers 1 and 15.
 Indiana I-90 between mile markers 6 and 21.
 Indiana I-94 near mile marker 16.
 Indiana I-65 between mile markers 245 and 261.

This includes...  Indiana University Northwest, Purdue University
Calumet, Illiana Motor Speedway, Lake County Fairgrounds, and South
Shore Rail Cats Baseball.

LAT...LON 4127 8753 4130 8753 4130 8762 4138 8779
      4156 8756 4167 8745 4167 8744 4168 8743
      4168 8742 4162 8730 4162 8722 4140 8722
TIME...MOT...LOC 1941Z 299DEG 19KT 4165 8738 4149 8740 4138 8768

BIRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:38 PM CDT	Special Weather Statement	LOT	Kendall	37 min
Jul 4, 9:05 PM CDT	Special Weather Statement	LOT	DuPage	25 min
Jul 4, 9:11 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	28 min
Jul 4, 9:43 PM CDT	Special Marine Warning	LOT		62 min
Jul 4, 9:51 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Will	3 hr
Jul 5, 12:00 PM CDT	Special Weather Statement	LOT	Lee	30 min
Jul 5, 12:39 PM CDT	Areal Flood Advisory	LOT	Livingston	3 hr
Jul 5, 1:00 PM CDT	Areal Flood Advisory	LOT	Iroquois	3 hr
Jul 5, 1:30 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	30 min
Jul 5, 1:42 PM CDT	Special Weather Statement	LOT	Will	33 min
Jul 5, 1:48 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	42 min
Jul 5, 2:09 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois	3 hr
Jul 5, 2:18 PM CDT	Special Weather Statement	LOT	Will	27 min
Jul 5, 2:31 PM CDT	Areal Flood Advisory	LOT	Cook, Will	3 hr
Jul 5, 3:43 PM CDT	Beach Hazards Statement	LOT	Lake	33 hr
Jul 5, 3:59 PM CDT	Small Craft Advisory	LOT		36 hr
Jul 5, 4:08 PM CDT	Areal Flood Warning	LOT	Iroquois	5 hr
Jul 5, 6:25 PM CDT	Special Weather Statement	LOT	LaSalle	35 min
Jul 4, 8:30 PM CDT	Special Weather Statement	LOT	Porter	30 min
Jul 5, 11:55 AM CDT	Special Weather Statement	LOT	Benton	35 min
Jul 5, 1:28 PM CDT	Flash Flood Warning	LOT	Benton, Jasper, Newton	6 hr
Jul 5, 2:41 PM CDT	Special Weather Statement	LOT	Lake	34 min
Jul 5, 3:22 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Newton, Porter	53 min
Jul 5, 4:18 PM CDT	Areal Flood Warning	LOT	Lake	5 hr
Jul 5, 4:26 PM CDT	River Flood Warning	LOT	Lake	12 hr

Nearby

Severe Thunderstorm Warnings in Indiana, 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.