Alert archive / Indiana / Porter County
Weather alerts in Porter County, Indiana, 2025
112 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Porter County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 112
- Warnings
- 15
- Watches
- 16
- Advisories
- 38
- Busiest month
- July22 alerts
- Busiest day
- March 14, 20254 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Porter County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 6 | 14% | 30 | 87% | 32 min |
| Flash flood warnings | 2 | 0 | 100% | 1 | 0% |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 19 | 6 | 68% | 23 | 48% | 11 min |
| NWS Chicago, IL: severe thunderstorm warnings | 137 | 95 | 31% | 628 | 86% | 25 min |
| NWS Chicago, IL: flash flood warnings | 34 | 19 | 44% | 130 | 78% | 56 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 18, 1:21 PM CST | Cold Weather Advisory | LOT | 46 hr |
| Jan 19, 12:58 PM CST | Cold Weather Advisory | LOT | 59 hr |
| Jan 30, 8:28 PM CST | Dense Fog Advisory | LOT | 13 hr |
| Jan 31, 1:07 AM CST | Flood Watch | LOT | 14 hr |
| Feb 4, 2:21 PM CST | Winter Weather Advisory | LOT | 40 hr |
| Feb 8, 2:00 AM CST | Winter Weather Advisory | LOT | 16 hr |
| Feb 10, 1:15 PM CST | Winter Storm Watch | LOT | 22 hr |
| Feb 11, 11:41 AM CST | Winter Weather Advisory | LOT | 39 hr |
| Feb 27, 1:55 PM CST | Wind Advisory | LOT | 31 hr |
| Mar 4, 3:06 PM CST | Wind Advisory | LOT | 33 hr |
| Mar 4, 3:08 PM CST | Lakeshore Flood Advisory | LOT | 37 hr |
| Mar 5, 11:07 AM CST | Areal Flood Advisory | LOT | 6 hr |
| Mar 13, 3:40 AM CDT | High Wind Watch | LOT | 35 hr |
| Mar 13, 3:40 AM CDT | Wind Advisory | LOT | 51 hr |
| Mar 13, 10:36 AM CDT | Fire Weather Watch | LOT | 24 hr |
| Mar 14, 4:11 AM CDT | Red Flag Warning | LOT | 20 hr |
| Mar 14, 2:26 PM CDT | High Wind Warning | LOT | 18 hr |
| Mar 14, 2:26 PM CDT | Wind Advisory | LOT | 26 hr |
| Mar 14, 6:55 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 14, 11:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Mar 15, 1:02 AM CDT | Special Weather Statement | LOT | 73 min |
| Mar 19, 2:57 AM CDT | Wind Advisory | LOT | 28 hr |
| Mar 19, 5:27 PM CDT | Severe Thunderstorm Warning | LOT | 56 min |
| Mar 23, 3:15 AM CDT | Wind Advisory | LOT | 21 hr |
| Mar 28, 10:33 AM CDT | Special Weather Statement | LOT | 27 min |
| Mar 30, 12:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 1:13 PM CDT | Tornado Watch | SPC | 5 hr |
| Mar 30, 2:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 30, 2:28 PM CDT | Severe Thunderstorm Warning | LOT | 56 min |
| Apr 2, 3:17 PM CDT | Tornado Watch | SPC | 7 hr |
| May 15, 5:15 PM CDT | Tornado Watch | SPC | 4 hr |
| May 15, 8:13 PM CDT | Severe Thunderstorm Warning | LOT | 62 min |
| May 16, 10:56 AM CDT | Wind Advisory | LOT | 10 hr |
| May 16, 5:32 PM CDT | Dust Storm Warning | LOT | 94 min |
| May 16, 6:00 PM CDT | Dust Storm Warning | LOT | 75 min |
| May 21, 3:09 AM CDT | Beach Hazards Statement | LOT | 46 hr |
| Jun 8, 5:35 PM CDT | Special Weather Statement | LOT | 40 min |
| Jun 18, 10:57 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 12:01 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 18, 12:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 1:57 PM CDT | Severe Thunderstorm Warning | LOT | 63 min |
| Jun 19, 3:33 PM CDT | Special Weather Statement | LOT | 27 min |
| Jun 19, 3:52 PM CDT | Special Weather Statement | LOT | 23 min |
| Jun 19, 4:10 PM CDT | Special Weather Statement | LOT | 20 min |
| Jun 20, 3:50 AM CDT | Heat Advisory | LOT | 5 days |
| Jun 24, 12:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 26, 8:04 PM CDT | Severe Thunderstorm Warning | LOT | 37 min |
| Jul 5, 8:55 PM CDT | Beach Hazards Statement | LOT | 48 hr |
| Jul 8, 5:19 PM CDT | Areal Flood Advisory | LOT | 116 min |
| Jul 9, 2:55 AM CDT | Beach Hazards Statement | LOT | 31 hr |
| Jul 16, 12:37 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 16, 3:41 PM CDT | Beach Hazards Statement | LOT | 36 hr |
| Jul 16, 4:08 PM CDT | Severe Thunderstorm Warning | LOT | 67 min |
| Jul 16, 4:28 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 19, 2:43 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 19, 4:23 PM CDT | Beach Hazards Statement | LOT | 41 hr |
| Jul 22, 3:21 AM CDT | Heat Advisory | LOT | 64 hr |
| Jul 24, 2:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 24, 2:31 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 24, 3:42 PM CDT | Special Weather Statement | LOT | 33 min |
| Jul 24, 4:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 26, 11:27 AM CDT | Areal Flood Advisory | LOT | 2 hr |
| Jul 26, 12:37 PM CDT | Areal Flood Advisory | LOT | 113 min |
| Jul 27, 1:27 PM CDT | Heat Advisory | LOT | 31 hr |
| Jul 29, 3:28 PM CDT | Beach Hazards Statement | LOT | 3 days |
| Jul 30, 3:18 AM CDT | Flood Watch | LOT | 25 hr |
| Jul 30, 12:02 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 12:57 PM CDT | Areal Flood Advisory | LOT | 5 hr |
| Jul 30, 1:56 PM CDT | Flash Flood Warning | LOT | 3 hr |
| Aug 12, 2:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 3:57 PM CDT | Special Weather Statement | LOT | 48 min |
| Aug 12, 4:09 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 16, 1:56 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 16, 2:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 16, 4:44 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Aug 16, 6:45 PM CDT | Severe Thunderstorm Warning | LOT | 45 min |
| Aug 17, 1:21 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 17, 2:04 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 17, 5:16 AM CDT | Beach Hazards Statement | LOT | 34 hr |
| Aug 18, 2:21 PM CDT | Flood Watch | LOT | 13 hr |
| Aug 18, 5:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 18, 9:12 PM CDT | Flash Flood Warning | LOT | 2 hr |
| Aug 18, 11:33 PM CDT | Areal Flood Advisory | LOT | 13 hr |
| Aug 19, 4:18 AM CDT | Beach Hazards Statement | LOT | 57 hr |
| Aug 19, 10:53 AM CDT | Areal Flood Advisory | LOT | 6 hr |
| Aug 23, 3:20 AM CDT | Beach Hazards Statement | LOT | 4 days |
| Aug 27, 2:44 PM CDT | Beach Hazards Statement | LOT | 47 hr |
| Sep 3, 3:39 AM CDT | Beach Hazards Statement | LOT | 35 hr |
| Sep 4, 2:46 PM CDT | Beach Hazards Statement | LOT | 28 hr |
| Sep 5, 10:58 PM CDT | Beach Hazards Statement | LOT | 5 hr |
| Sep 13, 8:21 AM CDT | Special Weather Statement | LOT | 39 min |
| Sep 21, 6:22 PM CDT | Special Weather Statement | LOT | 38 min |
| Sep 23, 4:56 PM CDT | Beach Hazards Statement | LOT | 44 hr |
| Oct 8, 1:33 PM CDT | Frost Advisory | LOT | 18 hr |
| Oct 23, 3:07 AM CDT | Frost Advisory | LOT | 29 hr |
| Nov 8, 2:27 AM CST | Winter Storm Watch | LOT | 24 hr |
| Nov 9, 2:24 AM CST | Winter Storm Warning | LOT | 31 hr |
| Nov 9, 2:24 AM CST | Winter Weather Advisory | LOT | 36 hr |
| Nov 9, 9:55 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Nov 10, 3:52 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Nov 10, 8:47 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Nov 25, 2:03 AM CST | Wind Advisory | LOT | 42 hr |
| Nov 27, 3:07 AM CST | Winter Storm Watch | LOT | 32 hr |
| Nov 28, 2:03 AM CST | Winter Storm Warning | LOT | 48 hr |
| Nov 30, 1:51 AM CST | Winter Weather Advisory | LOT | 10 hr |
| Dec 1, 1:54 AM CST | Winter Weather Advisory | LOT | 25 hr |
| Dec 6, 2:34 AM CST | Winter Weather Advisory | LOT | 32 hr |
| Dec 10, 9:12 AM CST | Special Weather Statement | LOT | 63 min |
| Dec 26, 5:19 AM CST | Dense Fog Advisory | LOT | 6 hr |
| Dec 27, 1:25 PM CST | Wind Advisory | LOT | 50 hr |
| Dec 28, 10:44 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 28, 1:17 PM CST | Areal Flood Advisory | LOT | 5 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 7 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 11 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flood Watch | 3 |
| Areal Flood Advisory | 12 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Cold Weather Advisory | 2 |
| Frost Advisory | 2 |
| Wind and dust | |
| Dust Storm Warning | 2 |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 9 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Coast and beach | |
| Lakeshore Flood Advisory | 1 |
| Beach Hazards Statement | 14 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.