Weather alerts in Porter County, Indiana, 2020

155 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts: 155
Warnings: 29
Watches: 21
Advisories: 61
Busiest month: May26 alerts
Busiest day: June 22, 20206 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, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	12	12	0%	24	100%	38 min
Flash flood warnings	2	0	100%	0

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Chicago, IL: tornado warnings	25	5	80%	35	37%	13 min
NWS Chicago, IL: severe thunderstorm warnings	112	77	31%	443	83%	33 min
NWS Chicago, IL: flash flood warnings	19	11	42%	64	83%	114 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 5, 3:18 AM CST	Lakeshore Flood Advisory	LOT	27 hr
Jan 7, 3:38 AM CST	Lakeshore Flood Advisory	LOT	32 hr
Jan 9, 3:39 AM CST	Flood Watch	LOT	55 hr
Jan 9, 3:54 AM CST	Lakeshore Flood Watch	LOT	17 hr
Jan 9, 10:58 AM CST	River Flood Warning	LOT	21 days
Jan 9, 10:58 AM CST	River Flood Warning	LOT	7 days
Jan 9, 8:50 PM CST	Lakeshore Flood Warning	LOT	57 hr
Jan 10, 11:44 AM CST	Winter Weather Advisory	LOT	38 hr
Jan 12, 7:37 PM CST	Winter Weather Advisory	LOT	7 hr
Jan 14, 8:49 PM CST	Dense Fog Advisory	LOT	14 hr
Jan 15, 4:02 AM CST	Lakeshore Flood Advisory	LOT	38 hr
Jan 16, 9:08 AM CST	River Flood Advisory	LOT	3 days
Jan 16, 2:44 PM CST	Winter Weather Advisory	LOT	51 hr
Jan 17, 10:00 AM CST	Lakeshore Flood Advisory	LOT	50 hr
Jan 18, 12:01 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 19, 3:09 PM CST	Winter Weather Advisory	LOT	13 hr
Feb 3, 3:31 AM CST	Lakeshore Flood Advisory	LOT	50 hr
Feb 5, 2:23 AM CST	Winter Weather Advisory	LOT	33 hr
Feb 8, 1:38 PM CST	Winter Weather Advisory	LOT	26 hr
Feb 11, 2:18 PM CST	Lakeshore Flood Watch	LOT	13 hr
Feb 11, 2:38 PM CST	Winter Weather Advisory	LOT	52 hr
Feb 12, 3:17 AM CST	Lakeshore Flood Warning	LOT	45 hr
Feb 23, 2:11 PM CST	Winter Storm Watch	LOT	48 hr
Feb 24, 3:40 AM CST	Lakeshore Flood Watch	LOT	12 hr
Feb 24, 3:13 PM CST	Lakeshore Flood Warning	LOT	66 hr
Feb 25, 3:34 AM CST	Winter Weather Advisory	LOT	38 hr
Mar 4, 2:46 PM CST	Lakeshore Flood Watch	LOT	13 hr
Mar 5, 4:13 AM CST	Lakeshore Flood Warning	LOT	41 hr
Mar 5, 2:10 PM CST	Wind Advisory	LOT	22 hr
Mar 9, 2:50 AM CDT	Lakeshore Flood Advisory	LOT	40 hr
Mar 19, 3:48 AM CDT	Lakeshore Flood Watch	LOT	12 hr
Mar 19, 3:59 PM CDT	Lakeshore Flood Advisory	LOT	39 hr
Mar 20, 3:08 AM CDT	Lakeshore Flood Warning	LOT	28 hr
Mar 25, 4:39 AM CDT	Dense Fog Advisory	LOT	6 hr
Mar 28, 2:43 PM CDT	Wind Advisory	LOT	29 hr
Apr 1, 10:43 PM CDT	Dense Fog Advisory	LOT	10 hr
Apr 6, 11:03 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 7, 5:26 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 7, 5:59 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 7, 7:22 PM CDT	Mesoscale Discussion	SPC	83 min
Apr 7, 8:19 PM CDT	Severe Thunderstorm Warning	LOT	41 min
Apr 7, 8:55 PM CDT	Severe Thunderstorm Warning	LOT	65 min
Apr 7, 9:13 PM CDT	Areal Flood Advisory	LOT	3 hr
Apr 9, 3:18 AM CDT	Wind Advisory	LOT	16 hr
Apr 12, 3:57 AM CDT	Wind Advisory	LOT	36 hr
Apr 12, 2:52 PM CDT	Lakeshore Flood Advisory	LOT	29 hr
Apr 15, 5:22 AM CDT	Winter Weather Advisory	LOT	5 hr
Apr 16, 3:28 AM CDT	Winter Weather Advisory	LOT	32 hr
Apr 20, 9:13 PM CDT	Special Weather Statement	LOT	62 min
Apr 26, 3:08 PM CDT	Frost Advisory	LOT	17 hr
Apr 29, 3:19 AM CDT	Lakeshore Flood Warning	LOT	46 hr
Apr 29, 8:22 PM CDT	Wind Advisory	LOT	19 hr
Apr 29, 8:48 PM CDT	Areal Flood Advisory	LOT	7 hr
May 7, 3:33 AM CDT	Freeze Watch	LOT	24 hr
May 7, 3:26 PM CDT	Lakeshore Flood Advisory	LOT	28 hr
May 8, 3:56 AM CDT	Freeze Warning	LOT	27 hr
May 8, 4:00 AM CDT	Lakeshore Flood Warning	LOT	18 hr
May 9, 2:48 PM CDT	Lakeshore Flood Advisory	LOT	36 hr
May 11, 2:45 PM CDT	Frost Advisory	LOT	17 hr
May 14, 12:06 PM CDT	Flash Flood Watch	LOT	17 hr
May 14, 10:58 PM CDT	Areal Flood Advisory	LOT	5 hr
May 15, 1:35 AM CDT	Areal Flood Advisory	LOT	115 min
May 15, 1:37 AM CDT	Special Weather Statement	LOT	38 min
May 16, 2:47 PM CDT	Flash Flood Watch	LOT	32 hr
May 16, 3:06 PM CDT	Lakeshore Flood Advisory	LOT	4 days
May 17, 1:07 PM CDT	River Flood Watch	LOT	21 days
May 17, 1:07 PM CDT	River Flood Watch	LOT	21 days
May 17, 1:44 PM CDT	Mesoscale Discussion	SPC	2 hr
May 17, 8:02 PM CDT	Flash Flood Warning	LOT	2 hr
May 19, 9:28 PM CDT	River Flood Advisory	LOT	59 hr
May 19, 9:28 PM CDT	River Flood Advisory	LOT	5 days
May 23, 12:33 PM CDT	Tornado Watch	SPC	8 hr
May 23, 2:51 PM CDT	Mesoscale Discussion	SPC	84 min
May 23, 4:23 PM CDT	Severe Thunderstorm Warning	LOT	56 min
May 23, 5:29 PM CDT	Severe Thunderstorm Warning	LOT	31 min
May 23, 7:33 PM CDT	Severe Thunderstorm Warning	LOT	72 min
May 23, 7:54 PM CDT	Areal Flood Advisory	LOT	3 hr
May 23, 8:06 PM CDT	Flash Flood Warning	LOT	4 hr
May 24, 3:52 PM CDT	River Flood Advisory	LOT	17 hr
Jun 5, 12:26 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 9, 2:33 AM CDT	Wind Advisory	LOT	21 hr
Jun 9, 6:20 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 10, 8:44 AM CDT	Mesoscale Discussion	SPC	91 min
Jun 11, 3:08 PM CDT	Beach Hazards Statement	LOT	66 hr
Jun 22, 12:48 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 1:36 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 22, 2:32 PM CDT	Special Weather Statement	LOT	58 min
Jun 22, 2:36 PM CDT	Severe Thunderstorm Warning	LOT	69 min
Jun 22, 4:01 PM CDT	Special Weather Statement	LOT	29 min
Jun 22, 4:59 PM CDT	Special Weather Statement	LOT	46 min
Jun 22, 9:21 PM CDT	Beach Hazards Statement	LOT	18 hr
Jun 26, 1:38 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 26, 6:39 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 26, 8:22 PM CDT	Severe Thunderstorm Warning	LOT	53 min
Jun 26, 8:50 PM CDT	Severe Thunderstorm Warning	LOT	25 min
Jun 26, 10:37 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 27, 1:40 AM CDT	Special Weather Statement	LOT	35 min
Jun 29, 5:41 PM CDT	Areal Flood Advisory	LOT	2 hr
Jul 9, 9:14 PM CDT	Beach Hazards Statement	LOT	34 hr
Jul 11, 3:58 PM CDT	Beach Hazards Statement	LOT	39 hr
Jul 11, 10:08 PM CDT	Severe Thunderstorm Warning	LOT	67 min
Jul 15, 9:42 PM CDT	Beach Hazards Statement	LOT	17 hr
Jul 16, 3:17 PM CDT	Beach Hazards Statement	LOT	4 hr
Jul 17, 3:36 AM CDT	Heat Advisory	LOT	40 hr
Jul 19, 9:17 AM CDT	Special Weather Statement	LOT	28 min
Jul 19, 10:12 AM CDT	Mesoscale Discussion	SPC	93 min
Jul 19, 10:32 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 19, 12:19 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 29, 3:33 PM CDT	Beach Hazards Statement	LOT	57 hr
Aug 2, 3:25 AM CDT	Beach Hazards Statement	LOT	3 days
Aug 2, 3:16 PM CDT	Lakeshore Flood Advisory	LOT	54 hr
Aug 10, 11:26 AM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr
Aug 10, 2:03 PM CDT	Beach Hazards Statement	LOT	23 hr
Aug 10, 3:31 PM CDT	Severe Thunderstorm Warning	LOT	89 min
Aug 10, 3:36 PM CDT	Mesoscale Discussion	SPC	84 min
Aug 15, 8:55 PM CDT	Beach Hazards Statement	LOT	22 hr
Aug 17, 3:41 AM CDT	Beach Hazards Statement	LOT	48 hr
Aug 28, 3:16 AM CDT	Beach Hazards Statement	LOT	59 hr
Aug 28, 12:32 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 28, 10:41 PM CDT	Mesoscale Discussion	SPC	94 min
Aug 31, 3:01 PM CDT	Beach Hazards Statement	LOT	25 hr
Sep 2, 3:27 PM CDT	Beach Hazards Statement	LOT	46 hr
Sep 5, 3:25 AM CDT	Beach Hazards Statement	LOT	19 hr
Sep 6, 3:44 PM CDT	Beach Hazards Statement	LOT	6 days
Sep 16, 3:05 AM CDT	Beach Hazards Statement	LOT	66 hr
Sep 18, 3:37 AM CDT	Frost Advisory	LOT	28 hr
Sep 27, 4:27 PM CDT	Beach Hazards Statement	LOT	12 hr
Sep 28, 4:36 AM CDT	Beach Hazards Statement	LOT	23 hr
Oct 4, 3:46 AM CDT	Frost Advisory	LOT	28 hr
Oct 12, 2:24 PM CDT	Severe Thunderstorm Warning	LOT	36 min
Oct 14, 3:44 AM CDT	Red Flag Warning	LOT	15 hr
Oct 14, 7:41 PM CDT	Freeze Watch	LOT	7 hr
Oct 15, 2:35 AM CDT	Freeze Warning	LOT	30 hr
Oct 16, 3:52 AM CDT	Fire Weather Watch	LOT	11 hr
Oct 16, 2:40 PM CDT	Wind Advisory	LOT	28 hr
Oct 16, 2:52 PM CDT	Red Flag Warning	LOT	29 hr
Oct 22, 3:30 AM CDT	Dense Fog Advisory	LOT	9 hr
Oct 23, 3:35 AM CDT	Lakeshore Flood Advisory	LOT	30 hr
Oct 28, 3:07 PM CDT	Lakeshore Flood Advisory	LOT	43 hr
Oct 30, 3:34 PM CDT	Lakeshore Flood Warning	LOT	60 hr
Oct 31, 10:44 AM CDT	Wind Advisory	LOT	30 hr
Nov 10, 2:58 AM CST	Wind Advisory	LOT	24 hr
Nov 10, 2:05 PM CST	Tornado Watch	SPC	6 hr
Nov 10, 6:04 PM CST	Mesoscale Discussion	SPC	116 min
Nov 10, 6:43 PM CST	Severe Thunderstorm Warning	LOT	63 min
Nov 14, 3:04 AM CST	Wind Advisory	LOT	41 hr
Nov 14, 3:10 PM CST	Lakeshore Flood Advisory	LOT	30 hr
Nov 18, 2:15 PM CST	Wind Advisory	LOT	26 hr
Nov 28, 2:42 PM CST	Lakeshore Flood Warning	LOT	69 hr
Nov 29, 1:45 PM CST	Winter Weather Advisory	LOT	42 hr
Dec 11, 2:47 PM CST	Lakeshore Flood Advisory	LOT	42 hr
Dec 23, 2:32 AM CST	Wind Advisory	LOT	25 hr
Dec 24, 2:54 AM CST	Winter Weather Advisory	LOT	33 hr
Dec 28, 3:04 PM CST	Winter Weather Advisory	LOT	39 hr
Dec 29, 3:52 PM CST	Mesoscale Discussion	SPC	4 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	12
Severe Thunderstorm Watch	5
Tornado Watch	2
Mesoscale Discussion	18
Special Weather Statement	7
Flooding
Flash Flood Warning	2
River Flood Warning	2
Flash Flood Watch	2
Flood Watch	1
River Flood Watch	2
Areal Flood Advisory	7
River Flood Advisory	4
Winter
Winter Storm Watch	1
Winter Weather Advisory	13
Heat
Heat Advisory	1
Cold
Freeze Warning	2
Freeze Watch	2
Frost Advisory	4
Wind and dust
Wind Advisory	12
Fire
Red Flag Warning	2
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	4
Coast and beach
Lakeshore Flood Warning	9
Lakeshore Flood Watch	5
Lakeshore Flood Advisory	16
Beach Hazards Statement	19

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2019 2021

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.