Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS Chicago, IL

June 13, 2017DeKalb County, Illinois

NWS Chicago, IL issued this special weather statement at Jun 13, 2017, 2:08 PM CDT for DeKalb County, Illinois. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 13, 2017, 2:08 PM CDT (19:08 UTC)
Expired: Jun 13, 2017, 2:45 PM CDT
In force: 37 min
Issued by: NWS Chicago, IL

County DeKalb County, IL

The radar

The Chicago radar (KLOT), 87 km from the middle of the area, began a volume at 19:07 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, 7.1 hours before the alert went out and 220 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: 1770 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: -40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jun 13, 1:13 PM CDT, 55 minutes earlier.

Area forecast discussion, Jun 13, 1:13 PM CDT, 55 minutes before

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</head>
<body>
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    <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>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Hazardous weather outlook, Jun 13, 11:32 AM CDT, 2 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1132 AM CDT Tue Jun 13 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
141645-
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-
1132 AM CDT Tue Jun 13 2017 /1232 PM EDT Tue Jun 13 2017/

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

.DAY ONE...This Afternoon and Tonight.

WEATHER HAZARDS EXPECTED:
  Limited Thunderstorm Risk...with an associated:
 Limited Thunderstorm Wind Damage Risk...up to 50 MPH. Limited
Hail Risk...up to penny size. Limited Excessive Heat Risk.

DISCUSSION:

Continued early season heat and more humid conditions will be
in place today with heat index readings near 100.

Scattered storms are mainly expected this afternoon and early
evening. Individual storms are unlikely to persist long enough to
bring a severe weather threat, though a few storms could provide
brief gusty winds to near severe limits, small hail, and
localized ponding on urban roads.

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

Wednesday...
  Elevated Severe Thunderstorm Risk.
  Limited Flooding Risk.
  Limited Excessive Heat Risk.
Thursday through Sunday...
  Limited Thunderstorm Risk.

DISCUSSION:

Early season hot and humid air will continue Wednesday with
afternoon heat index readings likely to be near 100 again in some
locations.

Organized storms are possible Wednesday afternoon and evening,
some of which could bring a severe weather threat. The risks
if storms do reach severe limits appear to be gusty winds and
possibly large hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely not be needed through tonight.

GENERAL STORM MOTION OF THE DAY:

Moving to the east at 10 mph.

&&

LMZ740>745-141645-
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-
1132 AM CDT Tue Jun 13 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.

  Limited Thunderstorm Risk.

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

Wednesday...
  Elevated Thunderstorm Risk.
Thursday through Sunday...
  Limited Thunderstorm Risk.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-141645-
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-
1132 AM CDT Tue Jun 13 2017

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

.DAY ONE...This Afternoon and Tonight.

Scattered thunderstorms are possible across the lake. The best
chance will be across the central and southern parts of the lake.

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

There will be periodic chances for thunderstorms though the
weekend.

&&

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In the hours before

Special weather statement, Jun 13, 2:08 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville Il
208 PM CDT TUE JUN 13 2017

ILZ004-008-011-131945-
Boone IL-De Kalb IL-Ogle IL-
208 PM CDT TUE JUN 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL OGLE...NORTHWESTERN
DE KALB AND SOUTHWESTERN BOONE COUNTIES UNTIL 245 PM CDT...

At 207 PM CDT, Doppler radar was tracking a strong thunderstorm over
Kirkland, or 9 miles west of Genoa, moving northeast at 15 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Genoa, Kirkland and Kingston.

Including the following interstate...
 I-39 between mile markers 109 and 111.

LAT...LON 4209 8868 4196 8888 4208 8905 4215 8898
      4215 8894 4220 8894 4222 8892
TIME...MOT...LOC 1907Z 222DEG 14KT 4209 8887

RODRIGUEZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 8:05 PM CDT	Special Marine Warning	LOT		115 min
Jun 12, 8:13 PM CDT	Special Weather Statement	LOT	McHenry	32 min
Jun 13, 2:13 PM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Ogle	21 min
Jun 13, 3:10 PM CDT	Severe Thunderstorm Warning	LOT	Boone, McHenry	30 min
Jun 13, 3:48 PM CDT	Severe Thunderstorm Warning	LOT	Will	42 min
Jun 13, 4:49 PM CDT	Special Weather Statement	LOT	Ogle	26 min
Jun 13, 5:52 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	38 min
Jun 13, 5:54 PM CDT	Areal Flood Advisory	LOT	Iroquois	3 hr
Jun 13, 6:17 PM CDT	Flash Flood Warning	LOT	Iroquois	6 hr
Jun 13, 6:35 PM CDT	Areal Flood Advisory	LOT	Iroquois	3 hr
Jun 13, 6:47 PM CDT	Areal Flood Warning	LOT	Iroquois, Kankakee	3 hr
Jun 13, 4:22 PM CDT	Severe Thunderstorm Warning	LOT	Benton	38 min
Jun 13, 5:02 PM CDT	Special Weather Statement	LOT	Benton	28 min
Jun 13, 5:34 PM CDT	Special Weather Statement	LOT	Benton	26 min
Jun 13, 6:00 PM CDT	Severe Thunderstorm Warning	LOT	Porter	30 min

Nearby

Special Weather Statements in Illinois, 2017 Every special weather statement 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.