Weather alerts in Nemaha County, Kansas, 2020

148 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Nemaha County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts: 148
Warnings: 39
Watches: 20
Advisories: 42
Busiest month: June34 alerts
Busiest day: July 29, 20207 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 Nemaha County in 2020 had a tornado report inside them.

Nemaha County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	1	50%	0
Severe thunderstorm warnings	20	11	45%	4	100%	31 min
Flash flood warnings	2	1	50%	3	100%	175 min

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Topeka, KS: tornado warnings	9	1	89%	2	50%	0 min
NWS Topeka, KS: severe thunderstorm warnings	167	88	47%	220	88%	24 min
NWS Topeka, KS: flash flood warnings	39	20	49%	50	94%	78 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 9, 3:15 PM CST	Winter Storm Watch	TOP	13 hr
Jan 10, 4:15 AM CST	Winter Storm Warning	TOP	34 hr
Jan 10, 4:15 AM CST	Winter Weather Advisory	TOP	34 hr
Jan 10, 12:54 PM CST	Mesoscale Discussion	SPC	6 hr
Jan 12, 12:47 PM CST	Winter Weather Advisory	TOP	7 hr
Jan 13, 5:55 PM CST	Dense Fog Advisory	TOP	18 hr
Jan 15, 3:14 PM CST	Winter Weather Advisory	TOP	47 hr
Jan 21, 3:27 PM CST	Winter Weather Advisory	TOP	21 hr
Jan 23, 3:27 AM CST	Winter Weather Advisory	TOP	27 hr
Jan 26, 5:14 AM CST	Dense Fog Advisory	TOP	5 hr
Feb 12, 3:33 AM CST	Wind Chill Advisory	TOP	30 hr
Mar 4, 2:21 PM CST	Fire Weather Watch	TOP	5 hr
Mar 4, 7:24 PM CST	Red Flag Warning	TOP	23 hr
Mar 6, 2:44 PM CST	Fire Weather Watch	TOP	12 hr
Mar 7, 3:06 AM CST	Red Flag Warning	TOP	16 hr
Mar 7, 9:44 PM CST	Fire Weather Watch	TOP	9 min
Mar 8, 3:41 AM CDT	Fire Weather Watch	TOP	7 hr
Mar 11, 6:07 AM CDT	Dense Fog Advisory	TOP	7 hr
Mar 19, 9:20 AM CDT	Wind Advisory	TOP	20 hr
Mar 19, 2:41 PM CDT	Mesoscale Discussion	SPC	3 hr
Mar 19, 5:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Mar 19, 5:50 PM CDT	Special Weather Statement	TOP	25 min
Mar 19, 6:00 PM CDT	Severe Thunderstorm Warning	TOP	45 min
Mar 22, 11:27 PM CDT	Dense Fog Advisory	TOP	12 hr
Mar 27, 3:40 PM CDT	Wind Advisory	TOP	28 hr
Mar 28, 1:34 AM CDT	Mesoscale Discussion	SPC	56 min
Apr 2, 3:47 AM CDT	Winter Weather Advisory	TOP	34 hr
Apr 9, 2:27 AM CDT	Freeze Warning	TOP	31 hr
Apr 11, 4:04 PM CDT	Wind Advisory	TOP	33 hr
Apr 11, 10:16 PM CDT	Severe Thunderstorm Warning	TOP	44 min
Apr 11, 10:57 PM CDT	Severe Thunderstorm Warning	TOP	48 min
Apr 12, 4:19 AM CDT	Freeze Warning	TOP	30 hr
Apr 13, 3:37 AM CDT	Freeze Warning	TOP	30 hr
Apr 14, 3:46 PM CDT	Freeze Warning	TOP	17 hr
Apr 16, 3:48 AM CDT	Winter Weather Advisory	TOP	24 hr
Apr 16, 3:50 AM CDT	Freeze Warning	TOP	29 hr
Apr 17, 2:37 PM CDT	Freeze Warning	TOP	18 hr
Apr 25, 6:23 PM CDT	Special Weather Statement	TOP	37 min
Apr 28, 7:41 PM CDT	Special Weather Statement	TOP	64 min
Apr 29, 3:44 AM CDT	Wind Advisory	TOP	15 hr
May 4, 6:33 AM CDT	Severe Thunderstorm Watch	SPC	12 hr
May 5, 9:40 AM CDT	Wind Advisory	TOP	8 hr
May 8, 2:21 PM CDT	Frost Advisory	TOP	17 hr
May 10, 2:29 PM CDT	Frost Advisory	TOP	13 hr
May 13, 11:48 PM CDT	Mesoscale Discussion	SPC	2 hr
May 14, 2:38 AM CDT	Special Weather Statement	TOP	22 min
May 14, 3:06 AM CDT	Special Weather Statement	TOP	24 min
May 14, 3:37 AM CDT	Special Weather Statement	TOP	38 min
May 14, 3:55 PM CDT	Mesoscale Discussion	SPC	95 min
May 14, 4:24 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
May 14, 8:54 PM CDT	Severe Thunderstorm Warning	TOP	51 min
May 14, 8:58 PM CDT	Severe Thunderstorm Warning	TOP	47 min
May 14, 9:23 PM CDT	Special Weather Statement	TOP	37 min
May 22, 10:45 AM CDT	Special Weather Statement	TOP	60 min
May 22, 3:54 PM CDT	Mesoscale Discussion	SPC	96 min
May 22, 6:45 PM CDT	Tornado Warning	TOP	45 min
May 22, 7:36 PM CDT	Special Weather Statement	TOP	24 min
May 22, 8:01 PM CDT	Severe Thunderstorm Warning	TOP	44 min
May 24, 3:42 AM CDT	Flash Flood Watch	TOP	56 hr
May 24, 1:13 PM CDT	Mesoscale Discussion	SPC	92 min
May 24, 1:40 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 24, 2:29 PM CDT	Special Weather Statement	TOP	31 min
Jun 3, 8:54 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 3, 9:38 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 3, 10:44 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 3, 11:58 PM CDT	Severe Thunderstorm Warning	TOP	62 min
Jun 4, 12:25 AM CDT	Severe Thunderstorm Warning	TOP	65 min
Jun 4, 11:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 5, 1:02 AM CDT	Severe Thunderstorm Warning	TOP	43 min
Jun 5, 1:36 AM CDT	Severe Thunderstorm Warning	TOP	39 min
Jun 5, 1:45 AM CDT	Severe Thunderstorm Warning	TOP	45 min
Jun 5, 1:59 AM CDT	Mesoscale Discussion	SPC	91 min
Jun 5, 2:58 PM CDT	Heat Advisory	TOP	28 hr
Jun 8, 3:40 PM CDT	High Wind Watch	TOP	12 hr
Jun 9, 3:31 AM CDT	Wind Advisory	TOP	32 hr
Jun 9, 2:36 PM CDT	Tornado Watch	SPC	7 hr
Jun 9, 5:47 PM CDT	Severe Thunderstorm Warning	TOP	43 min
Jun 9, 6:26 PM CDT	Tornado Warning	TOP	34 min
Jun 9, 6:43 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 9, 6:58 PM CDT	Severe Thunderstorm Warning	TOP	17 min
Jun 18, 6:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 18, 8:27 PM CDT	Severe Thunderstorm Warning	TOP	43 min
Jun 22, 6:40 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 6:58 PM CDT	Special Weather Statement	TOP	32 min
Jun 25, 1:05 AM CDT	Special Weather Statement	TOP	25 min
Jun 25, 3:36 AM CDT	Areal Flood Advisory	TOP	3 hr
Jun 26, 6:30 PM CDT	Mesoscale Discussion	SPC	90 min
Jun 26, 7:50 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 26, 10:41 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 27, 1:24 AM CDT	Special Weather Statement	TOP	36 min
Jun 27, 1:28 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 27, 2:08 AM CDT	Severe Thunderstorm Warning	TOP	52 min
Jun 28, 12:52 AM CDT	Mesoscale Discussion	SPC	83 min
Jun 28, 3:27 AM CDT	Special Weather Statement	TOP	48 min
Jun 28, 4:16 AM CDT	Special Weather Statement	TOP	44 min
Jun 29, 2:57 PM CDT	Heat Advisory	TOP	29 hr
Jul 1, 1:48 AM CDT	Mesoscale Discussion	SPC	87 min
Jul 1, 3:50 AM CDT	Mesoscale Discussion	SPC	85 min
Jul 8, 8:39 PM CDT	Mesoscale Discussion	SPC	96 min
Jul 8, 9:41 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 9, 1:07 AM CDT	Severe Thunderstorm Warning	TOP	53 min
Jul 9, 1:35 AM CDT	Severe Thunderstorm Warning	TOP	55 min
Jul 9, 2:09 AM CDT	Severe Thunderstorm Warning	TOP	66 min
Jul 9, 3:10 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 11, 1:23 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 11, 12:19 PM CDT	Special Weather Statement	TOP	26 min
Jul 11, 12:32 PM CDT	Severe Thunderstorm Warning	TOP	33 min
Jul 11, 12:43 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 11, 1:35 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 11, 1:37 PM CDT	Severe Thunderstorm Warning	TOP	38 min
Jul 16, 3:05 PM CDT	Heat Advisory	TOP	53 hr
Jul 20, 2:52 AM CDT	Special Weather Statement	TOP	23 min
Jul 20, 6:20 AM CDT	Areal Flood Advisory	TOP	3 hr
Jul 20, 10:54 AM CDT	River Flood Warning	TOP	9 hr
Jul 21, 12:26 AM CDT	Special Weather Statement	TOP	34 min
Jul 25, 3:11 PM CDT	Flash Flood Watch	TOP	37 hr
Jul 26, 3:45 AM CDT	Heat Advisory	TOP	15 hr
Jul 26, 2:06 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 29, 9:12 AM CDT	Areal Flood Advisory	TOP	2 hr
Jul 29, 10:04 AM CDT	Flash Flood Watch	TOP	41 hr
Jul 29, 10:31 AM CDT	Areal Flood Advisory	TOP	119 min
Jul 29, 11:36 AM CDT	Flash Flood Warning	TOP	4 hr
Jul 29, 1:26 PM CDT	River Flood Warning	TOP	36 hr
Jul 29, 2:57 PM CDT	Areal Flood Advisory	TOP	2 hr
Jul 29, 3:25 PM CDT	Areal Flood Warning	TOP	4 hr
Jul 30, 5:35 PM CDT	Flash Flood Warning	TOP	6 hr
Aug 7, 3:26 PM CDT	Heat Advisory	TOP	29 hr
Aug 9, 3:18 AM CDT	Heat Advisory	TOP	17 hr
Aug 16, 7:00 PM CDT	Special Weather Statement	TOP	45 min
Aug 31, 4:56 AM CDT	Mesoscale Discussion	SPC	2 hr
Oct 11, 3:35 AM CDT	Wind Advisory	TOP	25 hr
Oct 15, 2:49 PM CDT	Frost Advisory	TOP	18 hr
Oct 16, 3:01 PM CDT	Wind Advisory	TOP	24 hr
Oct 21, 2:46 PM CDT	Dense Fog Advisory	TOP	19 hr
Oct 22, 3:38 AM CDT	Freeze Watch	TOP	23 hr
Oct 23, 2:50 AM CDT	Freeze Warning	TOP	31 hr
Oct 25, 3:19 AM CDT	Winter Weather Advisory	TOP	60 hr
Nov 14, 3:33 AM CST	Wind Advisory	TOP	22 hr
Nov 17, 2:32 PM CST	Fire Weather Watch	TOP	12 hr
Nov 17, 2:42 PM CST	Wind Advisory	TOP	27 hr
Nov 18, 2:07 AM CST	Red Flag Warning	TOP	22 hr
Dec 22, 2:56 AM CST	Wind Advisory	TOP	20 hr
Dec 22, 2:33 PM CST	Wind Advisory	TOP	27 hr
Dec 28, 3:19 AM CST	Winter Weather Advisory	TOP	39 hr
Dec 29, 4:00 AM CST	Mesoscale Discussion	SPC	6 hr
Dec 29, 4:07 AM CST	Winter Storm Warning	TOP	14 hr
Dec 29, 10:02 AM CST	Mesoscale Discussion	SPC	5 hr
Dec 29, 6:17 PM CST	Winter Weather Advisory	TOP	3 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	20
Tornado Warning	2
Severe Thunderstorm Watch	8
Tornado Watch	1
Mesoscale Discussion	28
Special Weather Statement	19
Flooding
Areal Flood Warning	1
Flash Flood Warning	2
River Flood Warning	2
Flash Flood Watch	3
Areal Flood Advisory	5
Winter
Winter Storm Warning	2
Winter Storm Watch	1
Winter Weather Advisory	10
Heat
Heat Advisory	6
Cold
Freeze Warning	7
Freeze Watch	1
Frost Advisory	3
Wind Chill Advisory	1
Wind and dust
High Wind Watch	1
Wind Advisory	12
Fire
Red Flag Warning	3
Fire Weather Watch	5
Fog and smoke
Dense Fog Advisory	5

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.