Alert archive / Indiana / Porter County

Weather alerts in Porter County, Indiana, 2023

108 weather alerts in 2023, 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 2023. Tap one for its archive.

Alerts
108
Warnings
20
Watches
12
Advisories
33
Busiest month
July27 alerts
Busiest day
July 29, 20236 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

1 of 2 tornado warnings covering Porter County in 2023 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 4 minutes after it went out.

Porter County, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%1100%4 min
Severe thunderstorm warnings13746%1182%17 min
Flash flood warnings00

Each office's whole area, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Chicago, IL: tornado warnings321747%6856%11 min
NWS Chicago, IL: severe thunderstorm warnings16410635%54484%27 min
NWS Chicago, IL: flash flood warnings191047%4290%75 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.

IssuedProductOfficeLasted
Jan 1, 5:16 PM CSTDense Fog AdvisoryLOT16 hr
Jan 2, 9:04 AM CSTDense Fog AdvisoryLOT19 hr
Jan 3, 9:35 AM CSTDense Fog AdvisoryLOT16 hr
Jan 24, 1:57 AM CSTWinter Weather AdvisoryLOT52 hr
Jan 27, 2:28 PM CSTWinter Weather AdvisoryLOT40 hr
Jan 30, 12:03 AM CSTWinter Weather AdvisoryLOT8 hr
Feb 7, 2:42 PM CSTHigh Wind WatchLOT23 hr
Feb 8, 2:01 PM CSTWind AdvisoryLOT28 hr
Feb 14, 4:03 AM CSTWind AdvisoryLOT34 hr
Feb 15, 3:35 AM CSTWinter Weather AdvisoryLOT53 hr
Feb 16, 3:18 AM CSTLakeshore Flood AdvisoryLOT24 hr
Feb 23, 4:19 AM CSTDense Fog AdvisoryLOT5 hr
Feb 27, 9:14 AM CSTWind AdvisoryLOT3 hr
Feb 27, 10:38 AM CSTTornado WarningLOT37 min
Mar 2, 2:39 AM CSTWinter Storm WatchLOT18 hr
Mar 2, 8:38 PM CSTWinter Storm WarningLOT22 hr
Mar 3, 12:44 PM CSTRiver Flood WatchLOT22 hr
Mar 3, 4:25 PM CSTMesoscale DiscussionSPC4 hr
Mar 4, 10:24 PM CSTDense Fog AdvisoryLOT11 hr
Mar 26, 1:41 PM CDTMesoscale DiscussionSPC2 hr
Mar 26, 5:45 PM CDTSevere Thunderstorm WarningLOT20 min
Mar 31, 3:06 AM CDTWind AdvisoryLOT37 hr
Mar 31, 2:36 PM CDTTornado WatchSPC7 hr
Mar 31, 4:33 PM CDTSevere Thunderstorm WarningLOT57 min
Mar 31, 6:20 PM CDTMesoscale DiscussionSPC115 min
Mar 31, 7:54 PM CDTMesoscale DiscussionSPC2 hr
Mar 31, 8:22 PM CDTSevere Thunderstorm WarningLOT23 min
Mar 31, 8:39 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT46 min
Mar 31, 8:57 PM CDTTornado WarningLOT18 min
Mar 31, 9:07 PM CDTSevere Thunderstorm WarningLOT42 min
Apr 4, 3:42 PM CDTWind AdvisoryLOT24 hr
Apr 5, 3:27 AM CDTMesoscale DiscussionSPC93 min
Apr 5, 3:57 AM CDTSevere Thunderstorm WatchSPC8 hr
Apr 5, 5:10 AM CDTSevere Thunderstorm WarningLOT50 min
Apr 5, 6:44 AM CDTSevere Thunderstorm WarningLOT29 min
Apr 5, 8:11 AM CDTSevere Thunderstorm WarningLOT34 min
Apr 11, 3:19 AM CDTFire Weather WatchLOT23 hr
Apr 12, 2:40 AM CDTRed Flag WarningLOT16 hr
Apr 20, 3:53 AM CDTWind AdvisoryLOT14 hr
Apr 22, 1:56 PM CDTFreeze WatchLOT13 hr
Apr 23, 2:56 AM CDTFreeze WarningLOT29 hr
Apr 25, 1:41 PM CDTFrost AdvisoryLOT18 hr
Apr 26, 2:28 PM CDTFrost AdvisoryLOT17 hr
May 12, 5:53 PM CDTAreal Flood AdvisoryLOT112 min
May 24, 4:15 AM CDTBeach Hazards StatementLOT32 hr
Jun 7, 3:40 AM CDTBeach Hazards StatementLOT24 hr
Jun 10, 3:51 AM CDTBeach Hazards StatementLOT59 hr
Jun 14, 2:59 PM CDTBeach Hazards StatementLOT54 hr
Jun 25, 2:27 AM CDTSpecial Weather StatementLOT33 min
Jun 25, 12:49 PM CDTSpecial Weather StatementLOT11 min
Jun 26, 10:37 AM CDTBeach Hazards StatementLOT38 hr
Jun 29, 10:34 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 29, 12:41 PM CDTMesoscale DiscussionSPC2 hr
Jul 5, 3:22 PM CDTBeach Hazards StatementLOT29 hr
Jul 5, 7:14 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT46 min
Jul 11, 2:41 PM CDTMesoscale DiscussionSPC94 min
Jul 12, 3:53 PM CDTTornado WatchSPC5 hr
Jul 12, 7:02 PM CDTMesoscale DiscussionSPC58 min
Jul 12, 8:10 PM CDTBeach Hazards StatementLOT14 hr
Jul 14, 9:29 PM CDTMesoscale DiscussionSPC91 min
Jul 14, 10:50 PM CDTSevere Thunderstorm WarningLOT40 min
Jul 15, 4:04 PM CDTSpecial Weather StatementLOT41 min
Jul 15, 5:30 PM CDTSpecial Weather StatementLOT15 min
Jul 20, 3:11 AM CDTBeach Hazards StatementLOT37 hr
Jul 22, 4:21 PM CDTSpecial Weather StatementLOT39 min
Jul 22, 6:39 PM CDTAreal Flood AdvisoryLOT3 hr
Jul 26, 3:50 AM CDTHeat AdvisoryLOT65 hr
Jul 26, 11:01 AM CDTSpecial Weather StatementLOT44 min
Jul 26, 3:57 PM CDTMesoscale DiscussionSPC63 min
Jul 27, 4:06 AM CDTDense Fog AdvisoryLOT4 hr
Jul 28, 2:52 AM CDTMesoscale DiscussionSPC113 min
Jul 28, 5:00 AM CDTSevere Thunderstorm WarningLOT45 min
Jul 28, 5:59 AM CDTMesoscale DiscussionSPC2 hr
Jul 28, 6:37 AM CDTSevere Thunderstorm WarningLOT38 min
Jul 28, 7:21 PM CDTMesoscale DiscussionSPC2 hr
Jul 28, 7:30 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 28, 7:36 PM CDTFlood WatchLOT5 hr
Jul 28, 7:38 PM CDTMesoscale DiscussionSPC97 min
Jul 28, 11:43 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT62 min
Jul 29, 3:25 AM CDTBeach Hazards StatementLOT16 hr
Aug 3, 4:18 AM CDTDense Fog AdvisoryLOT5 hr
Aug 4, 3:55 AM CDTBeach Hazards StatementLOT24 hr
Aug 5, 3:47 PM CDTBeach Hazards StatementLOT53 hr
Aug 6, 9:58 PM CDTBeach Hazards StatementLOT30 hr
Aug 14, 3:42 AM CDTBeach Hazards StatementLOT42 hr
Aug 14, 11:13 AM CDTMesoscale DiscussionSPC2 hr
Aug 16, 7:48 PM CDTBeach Hazards StatementLOT43 hr
Aug 17, 4:41 AM CDTMesoscale DiscussionSPC3 hr
Aug 21, 2:47 AM CDTExcessive Heat WatchLOT48 hr
Aug 22, 2:59 AM CDTExcessive Heat WarningLOT65 hr
Aug 22, 2:17 PM CDTHeat AdvisoryLOT13 hr
Aug 25, 3:25 AM CDTBeach Hazards StatementLOT10 hr
Aug 25, 2:48 PM CDTBeach Hazards StatementLOT55 hr
Aug 28, 2:58 PM CDTBeach Hazards StatementLOT67 hr
Sep 6, 3:27 PM CDTBeach Hazards StatementLOT58 hr
Sep 11, 3:21 PM CDTBeach Hazards StatementLOT37 hr
Sep 13, 3:47 AM CDTSpecial Weather StatementLOT28 min
Sep 17, 3:55 AM CDTBeach Hazards StatementLOT29 hr
Oct 9, 2:04 PM CDTFrost AdvisoryLOT18 hr
Oct 10, 2:18 PM CDTFrost AdvisoryLOT18 hr
Oct 30, 8:34 AM CDTFreeze WarningLOT24 hr
Oct 31, 2:45 PM CDTWinter Weather AdvisoryLOT14 hr
Nov 5, 12:33 AM CDTDense Fog AdvisoryLOT10 hr
Dec 17, 2:28 AM CSTWind AdvisoryLOT40 hr
Dec 22, 11:35 PM CSTDense Fog AdvisoryLOT12 hr
Dec 23, 3:29 PM CSTDense Fog AdvisoryLOT21 hr
Dec 30, 6:15 PM CSTWinter Weather AdvisoryLOT17 hr
Dec 31, 5:07 PM CSTWinter Weather AdvisoryLOT9 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20222024

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.