Alert archive / Indiana / Special Weather Statements in 2021

Special Weather Statement, NWS Chicago, IL

August 25, 2021Porter County, Indiana

NWS Chicago, IL issued this special weather statement at Aug 25, 2021, 8:46 PM CDT for Porter County, Indiana. It was in force for 44 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: Aug 25, 2021, 8:46 PM CDT (01:46 UTC)
Expired: Aug 25, 2021, 9:30 PM CDT
In force: 44 min
Issued by: NWS Chicago, IL
Hail: 0.00 in
Wind: 50

County Porter County, IN

The radar

The Chicago radar (KLOT), 84 km from the middle of the area, began a volume at 01:48 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, 1.8 hours before the alert went out and 190 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: 2295 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1479 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 51 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 Aug 25, 6:38 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Aug 25, 6:38 PM CDT, 2 hours 8 minutes before

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Hazardous weather outlook, Aug 25, 3:46 PM CDT, 5 hours before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
346 PM CDT Wed Aug 25 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-262100-
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-
346 PM CDT Wed Aug 25 2021 /446 PM EDT Wed Aug 25 2021/

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 mph.
  Limited Flooding Risk.
  Elevated Excessive Heat Risk.
  Limited Fog Risk.

DISCUSSION...

Scattered thunderstorms are probable this evening. A few storms
could become strong to marginally severe with winds strong
enough to down tree limbs. In addition, torrential rainfall with
the strongest storms could lead to some isolated instances of
flooding.

Peak heat indices early this evening of up to 105 to 109 degrees
are expected for areas along and south of I-80 where a Heat
Advisory remains in effect through 7 PM CDT.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Limited Severe Thunderstorm Risk.
  Limited Flooding Risk.
  Elevated Excessive Heat Risk.
  Limited Fog Risk.
Friday and Saturday...
  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.
Sunday...
  Elevated Thunderstorm Risk.
  Limited Excessive Heat Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.

DISCUSSION:

 Thunderstorms are expected each day of the period, but appear
 most widespread on Sunday and least widespread on Saturday.
 Early next week the focus shifts to southern portions of the
 forecast area.

.SPOTTER INFORMATION STATEMENT...

 Spotters are encourage to report any damage they might observe
 this evening.

GENERAL STORM MOTION OF THE DAY:

 Moving toward the east and southeast at 20 to 25 mph.

LMZ740>745-262100-
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-
346 PM CDT Wed Aug 25 2021

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...

  Limited Thunderstorm Risk.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Limited Severe Thunderstorm Risk.
Friday and Saturday...
  Limited Thunderstorm Risk.
Sunday...
  Elevated Thunderstorm Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.

Lenning

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In the hours before

Local storm report, Aug 25, 6:41 PM CDT, 2 hours 5 minutes before

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Local storm report, Aug 25, 6:43 PM CDT, 2 hours 3 minutes before

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Local storm report, Aug 25, 6:44 PM CDT, 2 hours 2 minutes before

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Local storm report, Aug 25, 6:45 PM CDT, 2 hours 1 minute before

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Local storm report, Aug 25, 6:51 PM CDT, 1 hour 55 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
Aug 25, 7:21 PM CDT	Flash Flood Warning	LOT	Cook, DuPage	3 hr
Aug 25, 7:33 PM CDT	Special Marine Warning	LOT		117 min
Aug 25, 8:34 PM CDT	Areal Flood Advisory	LOT	Cook, Kankakee, Will	3 hr
Aug 25, 8:43 PM CDT	Special Weather Statement	LOT	Kankakee	47 min
Aug 25, 8:54 PM CDT	Areal Flood Advisory	LOT	DuPage, Kane, Kendall, Will	17 min
Aug 25, 9:06 PM CDT	Flash Flood Warning	LOT	DuPage, Kane, Kendall, Will	5 hr
Aug 25, 9:15 PM CDT	Flash Flood Warning	LOT	Cook, Kankakee, Will	4 hr
Aug 26, 1:38 AM CDT	Areal Flood Advisory	LOT	Kane, Kendall	2 hr
Aug 26, 5:30 PM CDT	Special Weather Statement	LOT	Cook	30 min
Aug 26, 1:28 AM CDT	Areal Flood Advisory	LOT	Lake, Porter	2 hr

Nearby

Special Weather Statements in Indiana, 2021 Every special weather statement in 2021

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.