Alert archive / Indiana / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 110, NWS Chicago, IL

July 7, 2017Jasper County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jul 7, 2017, 1:41 PM CDT for Jasper County, Indiana. It was in force for 19 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 7, 2017, 1:41 PM CDT (18:41 UTC)
Expired: Jul 7, 2017, 2:00 PM CDT
In force: 19 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

County Jasper County, IN

The radar

The Chicago radar (KLOT), 104 km from the middle of the area, began a volume at 18:44 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 7, 12:45 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.7 hours before the alert went out and 159 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: 1263 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1203 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

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 7, 1:38 PM CDT, 3 minutes earlier.

Area forecast discussion, Jul 7, 1:38 PM CDT, 3 minutes before

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Hazardous weather outlook, Jul 7, 3:29 AM CDT, 10 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
329 AM CDT Fri Jul 7 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
080830-
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-
329 AM CDT Fri Jul 7 2017 /429 AM EDT Fri Jul 7 2017/

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

.DAY ONE...Today and Tonight.

WEATHER HAZARDS EXPECTED:
  Limited Thunderstorm Risk...with an associated:
      Limited Hail Risk...up to quarter size.
      Limited Thunderstorm Wind Damage Risk...up to 60 MPH.

DISCUSSION:

Thunderstorms are possible this morning as an outflow boundary
from overnight thunderstorms moves south through northern Illinois
and northwest Indiana. There will be another chance for
thunderstorms this afternoon into early this evening as a weak
cold front moves through the region. Some storms may pose some
risk of large hail or damaging winds,

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Sunday...
  Limited Severe Thunderstorm Risk.
Monday through Wednesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon into early evening.

GENERAL STORM MOTION OF THE DAY:

Moving southeast at 25 mph.

&&

LMZ740>745-080830-
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-
329 AM CDT Fri Jul 7 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...Today and Tonight.

  Limited Thunderstorm Risk.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Sunday through Wednesday...
  Limited Thunderstorm Risk.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-080830-
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-
329 AM CDT Fri Jul 7 2017

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

.DAY ONE...Today and Tonight.

There is a chance for thunderstorms over the far southern portion
of the lake this morning.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

There will be periodic chances of thunderstorms Sunday through
Wednesday.

&&

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In the hours before

Local storm report, Jul 7, 12:12 PM CDT, 1 hour 29 minutes before

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Local storm report, Jul 7, 12:16 PM CDT, 1 hour 25 minutes before

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Local storm report, Jul 7, 12:45 PM CDT, 56 minutes before

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Special weather statement, Jul 7, 12:50 PM CDT, 51 minutes before

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Local storm report, Jul 7, 12:53 PM CDT, 48 minutes before

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Special weather statement, Jul 7, 12:53 PM CDT, 48 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
Jul 7, 12:45 AM CDT	Special Marine Warning	LOT		90 min
Jul 7, 12:48 AM CDT	Severe Thunderstorm Warning	LOT	Lake	45 min
Jul 7, 6:36 AM CDT	Special Marine Warning	LOT		39 min
Jul 7, 7:55 AM CDT	Special Weather Statement	LOT	Lake	20 min
Jul 7, 8:14 AM CDT	Special Marine Warning	LOT		46 min
Jul 7, 8:19 AM CDT	Special Weather Statement	LOT	Cook	26 min
Jul 7, 8:56 AM CDT	Special Marine Warning	LOT		49 min
Jul 7, 11:49 AM CDT	Severe Thunderstorm Warning	LOT	Cook	41 min
Jul 7, 12:36 PM CDT	Severe Thunderstorm Warning	LOT	Will	27 min
Jul 7, 12:50 PM CDT	Special Weather Statement	LOT	Kankakee	25 min
Jul 7, 6:45 AM CDT	Special Weather Statement	LOT	Porter	30 min
Jul 7, 7:04 AM CDT	Severe Thunderstorm Warning	LOT	Porter	26 min
Jul 7, 9:11 AM CDT	Severe Thunderstorm Warning	LOT	Porter	19 min
Jul 7, 11:53 AM CDT	Severe Thunderstorm Warning	LOT	Jasper, Porter	37 min
Jul 7, 12:53 PM CDT	Special Weather Statement	LOT	Jasper	22 min
Jul 7, 1:13 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Newton	47 min
Jul 7, 3:00 PM CDT	Special Weather Statement	LOT	Benton	30 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2017 Every severe thunderstorm warning 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.