Alert archive / Indiana / Flash Flood Warnings in 2025

Flash Flood Warning 10, NWS Chicago, IL

July 30, 20254 counties in Indiana

NWS Chicago, IL issued this flash flood warning at Jul 30, 2025, 1:56 PM CDT for 4 counties in Indiana. It was in force for 3 hr. 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 30, 2025, 1:56 PM CDT (18:56 UTC)
Expired: Jul 30, 2025, 4:41 PM CDT
In force: 3 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 81 km from the middle of the area, began a volume at 18:59 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, 6.9 hours before the alert went out and 167 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: 2051 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 30, 1:34 PM CDT, 22 minutes earlier.

Area forecast discussion, Jul 30, 1:34 PM CDT, 22 minutes before

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Hazardous weather outlook, Jul 30, 9:55 AM CDT, 4 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
955 AM CDT Wed Jul 30 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-311500-
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-
955 AM CDT Wed Jul 30 2025 /1055 AM EDT Wed Jul 30 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk along and southeast of Interstate 55:
     Level 1 of 5 Damaging Wind Risk...Up to 60 mph.
  Elevated Flooding Risk.
  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

Showers and storms will move across the area today. A few storms
may be severe mainly southeast of Interstate 55 primarily between
11 AM and 3 PM. Additional showers and storms are possible after
sunset with a threat for localized flooding.

Strengthening northeast winds and building waves on Lake Michigan
will produce hazardous swim conditions from this afternoon through
tonight.

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

DISCUSSION...

Thursday...
  Elevated Flooding Risk.
  Elevated Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.
Friday...
  High Swim Risk Lake Michigan Beaches.
Tuesday...
  Limited Thunderstorm Risk.

Showers and scattered thunderstorms will linger Thursday. Some of
these storms may produce locally heavy rainfall through early
afternoon.

Hazardous swimming conditions will persist at Lake Michigan
beaches into Friday.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation is not anticipated today, but any reports of severe
  weather would be appreciated.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east at 30 to 40 mph.

LMZ740>745-311500-
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-
955 AM CDT Wed Jul 30 2025

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...Today and Tonight.

Weather hazards expected...

  Hazardous conditions for small craft.
  Elevated Thunderstorm Risk...with an associated:
    Level 1 of 5 Thunderstorm Wind Gust Risk...up to 45 kt.

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

Thursday...
  Hazardous conditions for small craft are likely.
  Limited Thunderstorm Risk.
Friday...
  Hazardous conditions for small craft are likely.
Tuesday...
  Limited Thunderstorm Risk.

Borchardt

Visit us at www.weather.gov/chicago

In the hours before

Special weather statement, Jul 30, 12:41 PM CDT, 1 hour 15 minutes before

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Special weather statement, Jul 30, 12:47 PM CDT, 1 hour 9 minutes before

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Special weather statement, Jul 30, 1:09 PM CDT, 47 minutes before

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Special weather statement, Jul 30, 1:14 PM CDT, 42 minutes before

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Special weather statement, Jul 30, 1:32 PM CDT, 24 minutes before

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Local storm report, Jul 30, 1:35 PM CDT, 21 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 30, 3:18 AM CDT	Flood Watch	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	25 hr
Jul 30, 5:01 AM CDT	Special Weather Statement	LOT	Ogle	44 min
Jul 30, 11:01 AM CDT	Special Weather Statement	LOT	LaSalle	29 min
Jul 30, 11:17 AM CDT	Special Weather Statement	LOT	Grundy	28 min
Jul 30, 11:43 AM CDT	Special Weather Statement	LOT	Grundy	32 min
Jul 30, 11:52 AM CDT	Areal Flood Advisory	LOT	Grundy, Kankakee, Livingston, Will	5 hr
Jul 30, 12:12 PM CDT	Special Weather Statement	LOT	Grundy	33 min
Jul 30, 12:41 PM CDT	Special Weather Statement	LOT	Kankakee	34 min
Jul 30, 12:47 PM CDT	Special Weather Statement	LOT	Kankakee	28 min
Jul 30, 1:08 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois	4 hr
Jul 30, 1:14 PM CDT	Special Weather Statement	LOT	Kankakee	31 min
Jul 30, 12:57 PM CDT	Areal Flood Advisory	LOT	Jasper, Lake, Newton, Porter	5 hr
Jul 30, 1:09 PM CDT	Special Weather Statement	LOT	Jasper	21 min
Jul 30, 1:32 PM CDT	Special Weather Statement	LOT	Newton	28 min
Jul 30, 2:00 PM CDT	Special Weather Statement	LOT	Jasper, Newton	30 min

Nearby

Flash Flood Warnings in Indiana, 2025 Every flash flood warning in 2025

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.