Alert archive / Indiana / Special Weather Statements in 2021

Special Weather Statement, NWS Chicago, IL

August 11, 2021Porter County, Indiana

NWS Chicago, IL issued this special weather statement at Aug 11, 2021, 4:06 AM CDT for Porter County, Indiana. It was in force for 39 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 11, 2021, 4:06 AM CDT (09:06 UTC)
Expired: Aug 11, 2021, 4:45 AM CDT
In force: 39 min
Issued by: NWS Chicago, IL
Hail: 0.88 in
Wind: 30

County Porter County, IN

The radar

The Chicago radar (KLOT), 87 km from the middle of the area, began a volume at 09:06 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, 9.1 hours before the alert went out and 183 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: 2608 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 194 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 11, 3:53 AM CDT, 13 minutes earlier.

Area forecast discussion, Aug 11, 3:53 AM CDT, 13 minutes before

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Hazardous weather outlook, Aug 11, 12:15 AM CDT, 3 hours 51 minutes before

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In the hours before

Local storm report, Aug 10, 11:09 PM CDT, 4 hours 57 minutes before

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Local storm report, Aug 10, 11:11 PM CDT, 4 hours 55 minutes before

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Special weather statement, Aug 11, 1:59 AM CDT, 2 hours 7 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville
159 AM CDT Wed Aug 11 2021

ILZ023-033-INZ010-110745-
Iroquois IL-Kankakee IL-Newton IN-
159 AM CDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of southeastern
Kankakee, northern Iroquois and Newton Counties through 245 AM CDT...

At 158 AM CDT, Doppler radar was tracking a strong thunderstorm over
Clifton, moving east at 30 mph.

HAZARD...Nickel size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
Kankakee, Momence, Kentland, Clifton, Morocco, Lake Village,
Roselawn, St. Anne, Chebanse, Goodland, Brook, Ashkum, Aroma Park,
Hopkins Park, Martinton, Sun River Terrace, Beaverville, Donovan,
Sammons Point and Papineau.

Including the following interstates...
 I-57 between mile markers 291 and 312.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4074 8753 4088 8753 4084 8796 4090 8804
      4105 8805 4123 8753 4117 8753 4117 8745
      4116 8739 4118 8733 4122 8728 4074 8727
TIME...MOT...LOC 0658Z 247DEG 25KT 4093 8795

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH

FRIEDLEIN

Special weather statement, Aug 11, 2:43 AM CDT, 1 hour 23 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville
243 AM CDT Wed Aug 11 2021

ILZ023-INZ001-002-010-011-110845-
Kankakee IL-Porter IN-Newton IN-Jasper IN-Lake IN-
243 AM CDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of southeastern
Kankakee, northern Newton, southwestern Porter, southern Lake and
northwestern Jasper Counties through 345 AM CDT...

At 243 AM CDT, Doppler radar was tracking a strong thunderstorm over
Hopkins Park, or 8 miles south of Momence, moving northeast at 25
mph.

HAZARD...Nickel size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
DeMotte, Hebron, Momence, Lake Village, Roselawn, Hopkins Park,
Shelby, Schneider, Boone Grove, Sumava Resorts, Thayer, Stoutsburg,
Fair Oaks and Parr.

Including the following interstate...
 Indiana I-65 between mile markers 220 and 241.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4100 8710 4100 8753 4101 8753 4101 8769
      4117 8769 4138 8709
TIME...MOT...LOC 0743Z 245DEG 23KT 4105 8762

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH

FRIEDLEIN

Special weather statement, Aug 11, 3:45 AM CDT, 21 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville
345 AM CDT Wed Aug 11 2021

INZ001-002-110930-
Porter IN-Lake IN-
345 AM CDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of southwestern Porter
and southeastern Lake Counties through 430 AM CDT...

At 345 AM CDT, Doppler radar was tracking a strong thunderstorm near
Lowell, moving northeast at 20 mph.

HAZARD...Nickel size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
Portage, Merrillville, Hobart, Crown Point, Lowell, Hebron, Lakes of
the Four Seasons, Winfield, Lake Dalecarlia, Wheeler and Boone Grove.

Including the following interstate...
 Indiana I-65 between mile markers 237 and 249.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4128 8711 4128 8714 4126 8719 4122 8736
      4131 8745 4156 8718 4130 8705
TIME...MOT...LOC 0845Z 237DEG 19KT 4131 8734

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH

Kluber

Special weather statement, Aug 11, 4:06 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Chicago/Romeoville
406 AM CDT Wed Aug 11 2021

INZ001-002-011-110945-
Porter IN-Jasper IN-Lake IN-
406 AM CDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of southern Porter,
east central Lake and north central Jasper Counties through 445 AM
CDT...

At 405 AM CDT, Doppler radar was tracking a strong thunderstorm near
Hebron, moving northeast at 30 mph.

HAZARD...Winds in excess of 30 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Valparaiso, Hebron, Lakes of the Four Seasons, Winfield, Kouts, Boone
Grove and Malden.

Including the following interstate...
 Indiana I-90 between mile markers 35 and 37.

This includes...  Valparaiso University and Porter County
Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4123 8718 4138 8728 4160 8693 4127 8693
TIME...MOT...LOC 0905Z 241DEG 24KT 4133 8712

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...30 MPH

RATZER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:03 PM CDT	Special Marine Warning	LOT		117 min
Aug 10, 7:11 PM CDT	Severe Thunderstorm Warning	LOT	Will	49 min
Aug 10, 7:13 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, LaSalle	47 min
Aug 10, 9:22 PM CDT	Special Weather Statement	LOT	Kankakee	53 min
Aug 11, 6:39 AM CDT	Small Craft Advisory	LOT		15 hr
Aug 11, 8:25 AM CDT	Severe Thunderstorm Warning	LOT	Lee	50 min
Aug 11, 8:41 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	DeKalb, LaSalle, Lee	49 min
Aug 11, 9:05 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Grundy, Kane, Kendall	40 min
Aug 11, 9:25 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	DuPage, Kane, Will	65 min
Aug 11, 9:35 AM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Ogle, Winnebago	42 min
Aug 11, 9:40 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Cook, Will	65 min
Aug 11, 9:46 AM CDT	Severe Thunderstorm Warning	LOT	Kane, Lake, McHenry	59 min
Aug 11, 9:47 AM CDT	Special Marine Warning	LOT		118 min
Aug 11, 9:50 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Grundy, Kane, Kendall	40 min
Aug 11, 10:24 AM CDT	Special Weather Statement	LOT	Iroquois, Kankakee	66 min
Aug 11, 12:06 PM CDT	Special Marine Warning	LOT		54 min
Aug 10, 7:54 PM CDT	Severe Thunderstorm Warning	LOT	Lake	81 min
Aug 10, 8:20 PM CDT	Severe Thunderstorm Warning	LOT	Porter	55 min
Aug 10, 9:37 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Newton, Porter	68 min
Aug 11, 1:59 AM CDT	Special Weather Statement	LOT	Newton	46 min
Aug 11, 2:43 AM CDT	Special Weather Statement	LOT	Jasper	62 min
Aug 11, 3:45 AM CDT	Special Weather Statement	LOT	Lake	45 min
Aug 11, 4:08 AM CDT	Severe Thunderstorm Warning	LOT	Porter	36 min
Aug 11, 10:12 AM CDT	Severe Thunderstorm Warning	LOT	Lake, Porter	63 min
Aug 11, 11:15 AM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Newton, Porter	45 min

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.