Alert archive / Illinois / Special Weather Statements in 2019

Special Weather Statement, NWS Chicago, IL

November 27, 2019Will County, Illinois

NWS Chicago, IL issued this special weather statement at Nov 27, 2019, 2:21 AM CST for Will County, Illinois. It was in force for 24 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
Nov 27, 2019, 2:21 AM CST (08:21 UTC)
Expired
Nov 27, 2019, 2:45 AM CST
In force
24 min
Issued by
NWS Chicago, IL

County Will County, IL

The radar

The Chicago radar (KLOT), 10 km from the middle of the area, began a volume at 08:22 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, 8.4 hours before the alert went out and 177 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2019-11-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2019-11-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 417 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
596 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
417 m²/s²
0-3 km storm-relative helicity
467 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 Nov 27, 1:51 AM CST, 30 minutes earlier.

Area forecast discussion, Nov 27, 1:51 AM CST, 30 minutes before
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Hazardous weather outlook, Nov 26, 3:52 PM CST, 10 hours 29 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
352 PM CST Tue Nov 26 2019

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
272200-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
352 PM CST Tue Nov 26 2019 /452 PM EST Tue Nov 26 2019/

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:
     Limited damaging wind risk...up to 60.
     Limited Tornado risk...south of I-88.
  Limited Non thunderstorm wind Risk.

DISCUSSION...

A broken line of thunderstorms may develop and push towards the
I-39 corridor late this evening before proceeding northeastward.
Some of these storms may be strong to locally severe with a threat
for damaging winds although a brief tornado spin up along the line
cannot be ruled out.

Southwest winds will become gusty through the overnight hours.

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

Wednesday...
  Significant Non Thunderstorm Wind Risk.
  Elevated Lakeshore Flood Risk for northwest Indiana.
Friday and Saturday...
  Limited Snow Risk.
Sunday...
  Limited Snow Risk.

DISCUSSION:

Southwest winds will become westerly through Wednesday morning and
increase in speed. Wind gusts of 50 to 60 mph are anticipated with
the strongest winds expected during the 9 AM to 4 PM timeframe. A
High Wind Warning is in effect for all of northeast Illinois and
northwest Indiana.

The strong west to northwest winds will lead to the potential for
lakeshore flooding for the Indiana shore of Lake Michigan on
Wednesday and through Wednesday night.

.SPOTTER INFORMATION STATEMENT...

 Spotters may be needed during the late evening and early
 overnight hours.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the northeast at 50 to 60 mph.

LMZ740>745-272200-
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-
352 PM CST Tue Nov 26 2019

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.
  Limited Thunderstorm Risk.

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

Wednesday...
  Storm force winds and or extremely hazardous waves are likely.
Thursday through Monday...
  Hazardous conditions for small craft are likely.

Carlaw

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In the hours before

Local storm report, Nov 27, 1:17 AM CST, 1 hour 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
117 AM CST WED NOV 27 2019

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

1255 AM     TSTM WND GST     PERU                    41.33N 89.13W
11/27/2019  M63 MPH          LA SALLE           IL   ASOS

&&
Special weather statement, Nov 27, 1:27 AM CST, 54 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
127 AM CST Wed Nov 27 2019

ILZ012-270800-
Kane IL-
127 AM CST Wed Nov 27 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN KANE COUNTY UNTIL 200 AM
CST...

At 127 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Hinckley to near Plano. Movement was
northeast at 55 mph.

Wind gusts of 50 to 55 mph will be possible with these storms.

Locations impacted include...
Aurora, St. Charles, West Chicago, Batavia, Geneva, Montgomery, North
Aurora, Sugar Grove, Elburn, Wayne, Maple Park, Lily Lake, Virgil and
South Elgin.

Including the following interstate...
 I-88 between mile markers 102 and 120.

This includes...Aurora University, Fermilab, IL Math and Science
Academy, Kane County Cougars Ballpark, and Waubonsee Community
College.

LAT...LON 4204 8843 4192 8826 4173 8826 4172 8860
      4192 8860
TIME...MOT...LOC 0727Z 231DEG 48KT 4175 8870 4161 8851

Kluber
Special weather statement, Nov 27, 1:45 AM CST, 36 minutes before
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Special weather statement, Nov 27, 2:06 AM CST, 15 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
206 AM CST Wed Nov 27 2019

ILZ023-033-INZ001-002-010-011-019-270900-
Kankakee IL-Iroquois IL-Porter IN-Newton IN-Jasper IN-Lake IN-
Benton IN-
206 AM CST Wed Nov 27 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN KANKAKEE...
IROQUOIS...NEWTON...BENTON...SOUTHERN PORTER...SOUTHERN LAKE AND
JASPER COUNTIES UNTIL 300 AM CST/400 AM EST/...

At 204 AM CST/304 AM EST/, Doppler radar was tracking a line of
heavy showers along a line extending from near Chebanse to near
Cissna Park. Movement was northeast at 45 mph.

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

Locations impacted include...
Valparaiso, Kankakee, Bradley, Lowell, Rensselaer, Watseka, De Motte,
Hebron, Momence, Fowler, Kentland, Otterbein, Morocco, Stockland,
Hanging Grove, Claytonville, Roselawn, Talbot, Gifford and Pembroke.

Including the following interstates...
 I-57 between mile markers 296 and 313.
 Indiana I-65 between mile markers 200 and 245.

This includes...Valparaiso University, Kankakee Community College,
and US 41 Dragway.

LAT...LON 4091 8699 4084 8699 4084 8710 4048 8709
      4049 8783 4109 8798 4153 8693 4091 8693
TIME...MOT...LOC 0804Z 232DEG 41KT 4103 8785 4053 8775

Kluber
Special weather statement, Nov 27, 2:21 AM CST, 0 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
221 AM CST Wed Nov 27 2019

ILZ013-014-022-270845-
Cook IL-DuPage IL-Will IL-
221 AM CST Wed Nov 27 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WILL...SOUTHEASTERN
DUPAGE AND SOUTH CENTRAL COOK COUNTIES UNTIL 245 AM CST...

At 219 AM CST, Doppler radar was tracking heavy showers along a line
extending from near Plainfield to near Channahon. Movement was
northeast at 55 mph.

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

Locations impacted include...
Joliet, Naperville, Bolingbrook, Orland Park, Tinley Park, Downers
Grove, Elmhurst, Lombard, Romeoville, Plainfield, Lockport, Westmont,
New Lenox, Homer Glen, Lisle, Villa Park, Mokena, Hinsdale,
Westchester and Lemont.

Including the following interstates...
 I-55 between mile markers 244 and 279.
 I-80 between mile markers 123 and 147.
 I-88 between mile markers 131 and 140.
 I-290 between mile markers 13 and 16.
 I-355 between mile markers 1 and 22.

This includes... Argonne National Laboratory, University of St.
Francis, Benedictine University, Channahon State Park, Joliet Junior
College, and Lewis University.

LAT...LON 4192 8792 4156 8779 4137 8825 4166 8826
TIME...MOT...LOC 0819Z 232DEG 47KT 4159 8829 4140 8822

Kluber

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 26, 8:01 PM CSTRiver Flood AdvisoryLOTKane, Kendall25 hr
Nov 27, 1:03 AM CSTSevere Thunderstorm WarningLOTDeKalb, Grundy, Kendall, LaSalle42 min
Nov 27, 1:27 AM CSTSpecial Weather StatementLOTKane33 min
Nov 27, 1:45 AM CSTSpecial Weather StatementLOTKane45 min
Nov 27, 2:06 AM CSTSpecial Weather StatementLOTIroquois, Kankakee54 min
Nov 27, 10:11 AM CSTRiver Flood AdvisoryLOTWinnebago5 days

Nearby

Special Weather Statements in Illinois, 2019Every special weather statement in 2019

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.