Weather alerts in Knox County, Nebraska, 2019

157 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Knox County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts: 157
Warnings: 46
Watches: 22
Advisories: 42
Busiest month: July29 alerts
Busiest day: March 13, 20198 alerts

Over time

By month

Warning verification

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

Knox County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	13	5	62%	6	83%	14 min
Flash flood warnings	1	1	0%	0

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Omaha, NE: tornado warnings	23	7	70%	9	78%	18 min
NWS Omaha, NE: severe thunderstorm warnings	191	82	57%	179	74%	17 min
NWS Omaha, NE: flash flood warnings	47	10	79%	27	81%	284 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 7, 2:53 PM CST	Wind Advisory	OAX	25 hr
Jan 17, 3:38 AM CST	Winter Weather Advisory	OAX	48 hr
Jan 21, 3:47 AM CST	Winter Weather Advisory	OAX	50 hr
Jan 26, 3:02 PM CST	High Wind Watch	OAX	12 hr
Jan 27, 3:04 AM CST	High Wind Warning	OAX	31 hr
Jan 27, 3:55 AM CST	Wind Advisory	OAX	38 hr
Jan 27, 3:18 PM CST	Wind Chill Watch	OAX	36 hr
Jan 28, 2:38 AM CST	Wind Chill Warning	OAX	57 hr
Jan 28, 2:38 AM CST	Wind Chill Advisory	OAX	3 days
Jan 29, 3:19 AM CST	Wind Chill Advisory	OAX	54 hr
Feb 3, 8:49 PM CST	Winter Weather Advisory	OAX	7 hr
Feb 5, 3:31 PM CST	Winter Weather Advisory	OAX	50 hr
Feb 7, 3:29 AM CST	Wind Chill Advisory	OAX	33 hr
Feb 10, 3:56 AM CST	Winter Weather Advisory	OAX	44 hr
Feb 15, 3:35 PM CST	Winter Weather Advisory	OAX	50 hr
Feb 18, 3:50 AM CST	Winter Storm Watch	OAX	24 hr
Feb 19, 3:40 AM CST	Winter Storm Warning	OAX	32 hr
Feb 21, 4:18 AM CST	Winter Weather Advisory	OAX	71 hr
Feb 24, 5:02 AM CST	Winter Weather Advisory	OAX	10 hr
Mar 2, 3:22 AM CST	Wind Chill Advisory	OAX	57 hr
Mar 6, 3:21 AM CST	Winter Weather Advisory	OAX	36 hr
Mar 7, 3:08 PM CST	Winter Storm Watch	OAX	13 hr
Mar 8, 4:26 AM CST	Winter Weather Advisory	OAX	35 hr
Mar 9, 3:27 AM CST	Wind Advisory	OAX	21 hr
Mar 11, 3:31 AM CDT	Flood Watch	OAX	3 days
Mar 12, 3:42 AM CDT	High Wind Watch	OAX	36 hr
Mar 12, 11:25 AM CDT	River Flood Warning	OAX	4 days
Mar 12, 1:48 PM CDT	Areal Flood Advisory	OAX	6 hr
Mar 12, 3:13 PM CDT	Dense Fog Advisory	OAX	25 hr
Mar 13, 4:00 AM CDT	Winter Storm Watch	OAX	12 hr
Mar 13, 8:46 AM CDT	Areal Flood Warning	OAX	6 hr
Mar 13, 10:51 AM CDT	River Flood Warning	OAX	3 days
Mar 13, 1:26 PM CDT	Areal Flood Warning	OAX	6 hr
Mar 13, 3:35 PM CDT	Winter Storm Warning	OAX	23 hr
Mar 13, 4:02 PM CDT	High Wind Warning	OAX	28 hr
Mar 13, 4:02 PM CDT	Wind Advisory	OAX	33 hr
Mar 13, 6:29 PM CDT	Areal Flood Warning	OAX	39 hr
Mar 13, 7:57 PM CDT	River Flood Warning	FSD	21 days
Mar 13, 9:24 PM CDT	Flash Flood Warning	OAX	12 hr
Mar 13, 10:32 PM CDT	River Flood Warning	FSD	5 days
Mar 14, 1:13 AM CDT	River Flood Warning	FSD	21 days
Mar 14, 3:40 AM CDT	Winter Weather Advisory	OAX	14 hr
Mar 15, 9:45 AM CDT	Areal Flood Warning	OAX	24 hr
Mar 15, 10:28 AM CDT	River Flood Warning	OAX	27 hr
Mar 17, 4:24 AM CDT	River Flood Warning	OAX	15 hr
Mar 21, 5:20 AM CDT	River Flood Advisory	OAX	36 hr
Mar 29, 3:01 PM CDT	River Flood Warning	FSD	265 days
Apr 5, 1:05 AM CDT	Dense Fog Advisory	OAX	9 hr
Apr 5, 10:38 AM CDT	River Flood Warning	FSD	21 days
Apr 8, 4:25 PM CDT	Winter Storm Watch	OAX	35 hr
Apr 9, 3:25 PM CDT	Blizzard Warning	OAX	53 hr
Apr 10, 3:32 AM CDT	Winter Weather Advisory	OAX	48 hr
Apr 11, 2:34 AM CDT	Mesoscale Discussion	SPC	6 hr
Apr 11, 9:55 AM CDT	River Flood Warning	FSD	237 days
Apr 17, 6:05 AM CDT	Special Weather Statement	OAX	25 min
Apr 17, 6:57 AM CDT	Special Weather Statement	OAX	18 min
Apr 27, 3:24 AM CDT	Frost Advisory	OAX	24 hr
May 1, 4:12 PM CDT	Frost Advisory	OAX	17 hr
May 4, 4:33 AM CDT	Dense Fog Advisory	OAX	4 hr
May 4, 1:58 PM CDT	Mesoscale Discussion	SPC	2 hr
May 9, 3:33 AM CDT	Frost Advisory	OAX	29 hr
May 17, 11:14 PM CDT	Mesoscale Discussion	SPC	2 hr
May 22, 11:01 AM CDT	River Flood Warning	OAX	11 hr
May 27, 12:14 AM CDT	Severe Thunderstorm Warning	OAX	61 min
May 29, 8:09 AM CDT	River Flood Warning	FSD	42 days
May 31, 3:45 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 8, 3:47 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 20, 4:32 AM CDT	Special Weather Statement	OAX	28 min
Jun 20, 9:53 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 20, 9:58 AM CDT	Severe Thunderstorm Warning	OAX	32 min
Jun 20, 10:25 AM CDT	Severe Thunderstorm Warning	OAX	35 min
Jun 28, 3:01 PM CDT	Heat Advisory	OAX	30 hr
Jun 29, 2:55 AM CDT	Heat Advisory	OAX	41 hr
Jul 1, 1:31 PM CDT	Mesoscale Discussion	SPC	119 min
Jul 1, 6:42 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 1, 10:18 PM CDT	Areal Flood Advisory	OAX	4 hr
Jul 5, 4:03 AM CDT	Severe Thunderstorm Warning	OAX	57 min
Jul 5, 4:54 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 6, 8:47 PM CDT	River Flood Warning	OAX	9 hr
Jul 12, 7:58 AM CDT	River Flood Warning	FSD	62 days
Jul 13, 2:22 AM CDT	Special Weather Statement	OAX	68 min
Jul 15, 3:48 PM CDT	Excessive Heat Watch	OAX	5 hr
Jul 15, 3:48 PM CDT	Excessive Heat Watch	OAX	5 hr
Jul 15, 3:48 PM CDT	Excessive Heat Watch	OAX	36 hr
Jul 15, 7:16 PM CDT	Special Weather Statement	OAX	29 min
Jul 15, 10:14 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 16, 2:01 AM CDT	Special Weather Statement	OAX	59 min
Jul 16, 3:02 AM CDT	Special Weather Statement	OAX	58 min
Jul 16, 3:56 PM CDT	Excessive Heat Warning	OAX	4 days
Jul 17, 4:14 AM CDT	Mesoscale Discussion	SPC	91 min
Jul 17, 4:48 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 17, 5:03 AM CDT	Severe Thunderstorm Warning	OAX	57 min
Jul 17, 5:58 AM CDT	Special Weather Statement	OAX	62 min
Jul 17, 6:13 AM CDT	Severe Thunderstorm Warning	OAX	62 min
Jul 17, 9:09 AM CDT	Mesoscale Discussion	SPC	96 min
Jul 26, 8:12 PM CDT	Special Weather Statement	OAX	33 min
Jul 26, 8:26 PM CDT	Severe Thunderstorm Warning	OAX	49 min
Jul 26, 9:07 PM CDT	Severe Thunderstorm Warning	OAX	27 min
Jul 26, 9:29 PM CDT	Special Weather Statement	OAX	31 min
Jul 28, 7:27 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 28, 9:30 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 28, 9:46 PM CDT	Special Weather Statement	OAX	29 min
Aug 6, 6:19 PM CDT	Mesoscale Discussion	SPC	116 min
Aug 6, 8:19 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 7, 10:50 PM CDT	Severe Thunderstorm Warning	OAX	25 min
Aug 7, 11:10 PM CDT	Severe Thunderstorm Warning	OAX	35 min
Aug 7, 11:13 PM CDT	Mesoscale Discussion	SPC	92 min
Aug 9, 6:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 9, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 9, 11:13 PM CDT	Special Weather Statement	OAX	17 min
Aug 9, 11:32 PM CDT	Special Weather Statement	OAX	28 min
Aug 10, 12:57 AM CDT	Areal Flood Advisory	OAX	3 hr
Aug 17, 5:12 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 17, 6:14 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 17, 8:26 PM CDT	Mesoscale Discussion	SPC	94 min
Aug 17, 10:32 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 17, 11:29 PM CDT	Special Weather Statement	OAX	31 min
Aug 17, 11:51 PM CDT	Special Weather Statement	OAX	24 min
Aug 18, 12:00 AM CDT	Mesoscale Discussion	SPC	90 min
Aug 25, 9:49 PM CDT	Mesoscale Discussion	SPC	116 min
Sep 2, 4:30 AM CDT	Special Weather Statement	OAX	30 min
Sep 2, 5:02 AM CDT	Special Weather Statement	OAX	43 min
Sep 10, 7:26 PM CDT	Severe Thunderstorm Warning	OAX	23 min
Sep 10, 8:07 PM CDT	Mesoscale Discussion	SPC	83 min
Sep 10, 8:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 10, 11:42 PM CDT	Special Weather Statement	OAX	33 min
Sep 11, 4:13 AM CDT	Flash Flood Watch	OAX	27 hr
Sep 11, 5:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 11, 8:03 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 11, 8:41 PM CDT	Severe Thunderstorm Warning	OAX	34 min
Sep 11, 9:23 PM CDT	Special Weather Statement	OAX	37 min
Sep 12, 12:43 AM CDT	Special Weather Statement	OAX	47 min
Sep 12, 1:24 AM CDT	Special Weather Statement	OAX	51 min
Sep 12, 2:50 AM CDT	River Flood Warning	OAX	50 hr
Sep 13, 9:31 PM CDT	River Flood Warning	FSD	21 days
Sep 19, 8:26 AM CDT	River Flood Warning	FSD	72 days
Sep 30, 10:11 PM CDT	Severe Thunderstorm Warning	OAX	27 min
Oct 3, 8:16 PM CDT	Frost Advisory	OAX	13 hr
Oct 9, 3:11 AM CDT	Freeze Watch	OAX	12 hr
Oct 9, 3:33 PM CDT	Freeze Warning	OAX	42 hr
Oct 11, 4:12 AM CDT	Freeze Warning	OAX	30 hr
Oct 12, 9:56 AM CDT	Wind Advisory	OAX	9 hr
Oct 20, 5:48 PM CDT	Mesoscale Discussion	SPC	117 min
Oct 21, 3:42 AM CDT	Wind Advisory	OAX	30 hr
Nov 10, 2:34 PM CST	Winter Weather Advisory	OAX	18 hr
Nov 13, 3:32 AM CST	Winter Weather Advisory	OAX	9 hr
Nov 24, 1:51 PM CST	Winter Storm Watch	OAX	26 hr
Nov 25, 3:52 AM CST	Winter Storm Warning	OAX	53 hr
Nov 26, 10:58 AM CST	Mesoscale Discussion	SPC	6 hr
Nov 26, 5:23 PM CST	Mesoscale Discussion	SPC	6 hr
Nov 27, 4:07 PM CST	Winter Weather Advisory	OAX	47 hr
Nov 30, 3:20 AM CST	Winter Weather Advisory	OAX	33 hr
Dec 24, 9:10 PM CST	Dense Fog Advisory	OAX	12 hr
Dec 26, 4:06 PM CST	Winter Storm Watch	OAX	23 hr
Dec 27, 3:22 AM CST	Winter Weather Advisory	OAX	24 hr
Dec 27, 3:29 PM CST	Winter Storm Warning	OAX	63 hr
Dec 27, 3:29 PM CST	Winter Weather Advisory	OAX	3 days

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	13
Severe Thunderstorm Watch	7
Mesoscale Discussion	26
Special Weather Statement	21
Flooding
Areal Flood Warning	4
Flash Flood Warning	1
River Flood Warning	17
Flash Flood Watch	1
Flood Watch	1
Areal Flood Advisory	3
River Flood Advisory	1
Winter
Blizzard Warning	1
Winter Storm Warning	4
Winter Storm Watch	6
Winter Weather Advisory	18
Heat
Excessive Heat Warning	1
Excessive Heat Watch	3
Heat Advisory	2
Cold
Freeze Warning	2
Wind Chill Warning	1
Freeze Watch	1
Wind Chill Watch	1
Frost Advisory	4
Wind Chill Advisory	4
Wind and dust
High Wind Warning	2
High Wind Watch	2
Wind Advisory	6
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2018 2020

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.