Alert archive / South Dakota / Fall River County

Weather alerts in Fall River County, South Dakota, 2008

157 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Fall River County and its neighbors

Each county as a circle sized by its count in 2008. Tap one for its archive.

Alerts: 157
Warnings: 58
Watches: 28
Advisories: 30
Busiest month: July48 alerts
Busiest day: July 22, 200810 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 4 tornado warnings covering Fall River County in 2008 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 30 minutes after it went out.

Fall River County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	1	75%	1	100%	30 min
Severe thunderstorm warnings	45	27	40%	25	80%	33 min
Flash flood warnings	3	0	100%	1	0%

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Rapid City, SD: tornado warnings	20	8	60%	11	73%	15 min
NWS Rapid City, SD: severe thunderstorm warnings	496	269	46%	410	90%	28 min
NWS Rapid City, SD: flash flood warnings	13	1	92%	2	50%	93 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 19, 2:56 PM MST	Winter Weather Advisory	UNR	44 hr
Jan 21, 2:48 PM MST	Wind Chill Advisory	UNR	18 hr
Jan 22, 2:54 PM MST	Blowing Snow Advisory	UNR	19 hr
Jan 28, 2:46 PM MST	Wind Chill Advisory	UNR	26 hr
Mar 13, 2:45 PM MDT	Snow Advisory	UNR	24 hr
Mar 15, 2:35 PM MDT	Snow Advisory	UNR	23 hr
Mar 29, 2:26 PM MDT	Mesoscale Discussion	SPC	3 hr
Mar 29, 2:56 PM MDT	Winter Storm Watch	UNR	37 hr
Mar 30, 11:45 AM MDT	Snow Advisory	UNR	33 hr
Apr 8, 2:43 AM MDT	Winter Storm Watch	UNR	49 hr
Apr 9, 3:04 PM MDT	Winter Weather Advisory	UNR	44 hr
Apr 20, 6:05 PM MDT	Mesoscale Discussion	SPC	55 min
Apr 23, 12:16 PM MDT	Mesoscale Discussion	SPC	2 hr
Apr 23, 5:35 PM MDT	Severe Thunderstorm Warning	UNR	55 min
Apr 23, 5:48 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 23, 6:03 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Apr 30, 4:38 AM MDT	Winter Storm Watch	UNR	34 hr
Apr 30, 4:38 AM MDT	Winter Storm Warning	UNR	58 hr
Apr 30, 4:18 PM MDT	Mesoscale Discussion	SPC	117 min
May 1, 2:18 PM MDT	Snow and Blowing Snow Advisory	UNR	24 hr
May 9, 12:00 PM MDT	Mesoscale Discussion	SPC	3 hr
May 9, 12:30 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
May 9, 2:47 PM MDT	Mesoscale Discussion	SPC	118 min
May 9, 5:02 PM MDT	Mesoscale Discussion	SPC	118 min
May 21, 2:55 AM MDT	Wind Advisory	UNR	11 hr
May 21, 2:21 PM MDT	Mesoscale Discussion	SPC	54 min
May 21, 2:46 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
May 21, 5:33 PM MDT	Mesoscale Discussion	SPC	57 min
May 21, 7:40 PM MDT	Mesoscale Discussion	SPC	65 min
May 23, 5:02 PM MDT	Mesoscale Discussion	SPC	58 min
May 23, 5:19 PM MDT	Wind Advisory	UNR	4 hr
May 23, 5:37 PM MDT	Mesoscale Discussion	SPC	23 min
May 23, 6:07 PM MDT	Tornado Watch	SPC	5 hr
May 29, 12:33 PM MDT	Tornado Watch	SPC	7 hr
May 29, 4:15 PM MDT	Severe Thunderstorm Warning	UNR	60 min
May 30, 5:46 PM MDT	Severe Thunderstorm Warning	UNR	36 min
May 31, 3:08 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jun 1, 2:02 PM MDT	Mesoscale Discussion	SPC	88 min
Jun 1, 2:29 PM MDT	Tornado Watch	SPC	8 hr
Jun 1, 4:42 PM MDT	Mesoscale Discussion	SPC	93 min
Jun 1, 6:45 PM MDT	Mesoscale Discussion	SPC	60 min
Jun 1, 8:46 PM MDT	Mesoscale Discussion	SPC	59 min
Jun 1, 9:56 PM MDT	Severe Thunderstorm Warning	UNR	64 min
Jun 1, 10:10 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jun 1, 10:57 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jun 1, 11:00 PM MDT	Severe Thunderstorm Warning	UNR	45 min
Jun 1, 11:02 PM MDT	Severe Thunderstorm Warning	UNR	88 min
Jun 2, 12:48 AM MDT	Severe Thunderstorm Warning	UNR	37 min
Jun 2, 2:36 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 3, 1:53 AM MDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 4, 3:22 AM MDT	Flood Watch	UNR	40 hr
Jun 8, 1:53 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 16, 7:06 PM MDT	Severe Thunderstorm Warning	UNR	54 min
Jun 17, 12:40 PM MDT	Mesoscale Discussion	SPC	65 min
Jun 17, 1:27 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 17, 5:50 PM MDT	Tornado Warning	UNR	40 min
Jun 17, 6:11 PM MDT	Tornado Warning	UNR	49 min
Jun 17, 6:23 PM MDT	Tornado Warning	UNR	52 min
Jun 17, 6:29 PM MDT	Mesoscale Discussion	SPC	61 min
Jun 17, 6:53 PM MDT	Severe Thunderstorm Warning	UNR	35 min
Jun 18, 1:19 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 18, 5:29 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 18, 6:01 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 18, 9:46 PM MDT	Severe Thunderstorm Warning	UNR	74 min
Jun 18, 10:28 PM MDT	Mesoscale Discussion	SPC	62 min
Jun 18, 10:55 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jun 19, 3:07 AM MDT	Severe Thunderstorm Warning	UNR	34 min
Jun 19, 2:53 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 19, 6:22 PM MDT	Severe Thunderstorm Watch	SPC	27 hr
Jun 20, 2:31 PM MDT	Mesoscale Discussion	SPC	59 min
Jun 20, 5:34 PM MDT	Severe Thunderstorm Warning	UNR	34 min
Jun 20, 6:08 PM MDT	Mesoscale Discussion	SPC	67 min
Jun 23, 4:13 PM MDT	Mesoscale Discussion	SPC	62 min
Jun 23, 4:26 PM MDT	Severe Thunderstorm Warning	UNR	34 min
Jun 23, 4:52 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 23, 6:03 PM MDT	Severe Thunderstorm Warning	UNR	57 min
Jun 23, 6:50 PM MDT	Mesoscale Discussion	SPC	55 min
Jun 23, 7:37 PM MDT	Severe Thunderstorm Warning	UNR	53 min
Jun 25, 6:49 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Jun 25, 7:02 PM MDT	Areal Flood Advisory	UNR	3 hr
Jun 25, 7:19 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Jun 25, 7:40 PM MDT	Severe Thunderstorm Warning	UNR	35 min
Jun 26, 8:14 PM MDT	Severe Thunderstorm Warning	UNR	61 min
Jul 1, 1:37 PM MDT	Areal Flood Advisory	UNR	4 hr
Jul 2, 1:27 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 2, 4:57 PM MDT	Mesoscale Discussion	SPC	63 min
Jul 6, 6:08 PM MDT	Mesoscale Discussion	SPC	67 min
Jul 18, 3:30 AM MDT	Severe Thunderstorm Warning	UNR	60 min
Jul 18, 3:41 AM MDT	Flash Flood Watch	UNR	25 hr
Jul 18, 4:22 AM MDT	Severe Thunderstorm Warning	UNR	53 min
Jul 18, 5:00 AM MDT	Flash Flood Warning	UNR	3 hr
Jul 18, 12:29 PM MDT	Areal Flood Advisory	UNR	6 hr
Jul 18, 4:32 PM MDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 18, 5:15 PM MDT	Areal Flood Warning	UNR	5 hr
Jul 18, 5:40 PM MDT	Severe Thunderstorm Warning	UNR	65 min
Jul 18, 10:47 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 20, 3:45 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 20, 4:22 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 22, 11:38 AM MDT	Flash Flood Watch	UNR	16 hr
Jul 22, 2:25 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 22, 3:54 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jul 22, 3:57 PM MDT	Severe Thunderstorm Warning	UNR	63 min
Jul 22, 3:58 PM MDT	Flash Flood Warning	UNR	6 hr
Jul 22, 4:38 PM MDT	Flash Flood Warning	UNR	6 hr
Jul 22, 4:44 PM MDT	Severe Thunderstorm Warning	UNR	44 min
Jul 22, 4:53 PM MDT	Severe Thunderstorm Warning	UNR	67 min
Jul 22, 5:20 PM MDT	Areal Flood Advisory	UNR	6 hr
Jul 22, 5:38 PM MDT	Severe Thunderstorm Warning	UNR	50 min
Jul 22, 10:01 PM MDT	Areal Flood Advisory	UNR	7 hr
Jul 22, 10:45 PM MDT	Areal Flood Advisory	UNR	7 hr
Jul 22, 11:01 PM MDT	Areal Flood Advisory	UNR	6 hr
Jul 23, 1:22 PM MDT	Mesoscale Discussion	SPC	113 min
Jul 23, 3:24 PM MDT	Severe Thunderstorm Warning	UNR	66 min
Jul 23, 5:17 PM MDT	Severe Thunderstorm Warning	UNR	58 min
Jul 23, 5:54 PM MDT	Tornado Warning	UNR	51 min
Jul 23, 6:10 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jul 23, 7:02 PM MDT	Severe Thunderstorm Warning	UNR	28 min
Jul 23, 7:45 PM MDT	Areal Flood Advisory	UNR	6 hr
Jul 24, 1:31 PM MDT	Mesoscale Discussion	SPC	59 min
Jul 24, 2:04 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 24, 6:01 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jul 24, 6:04 PM MDT	Severe Thunderstorm Warning	UNR	56 min
Jul 24, 6:17 PM MDT	Severe Thunderstorm Warning	UNR	58 min
Jul 24, 6:36 PM MDT	Mesoscale Discussion	SPC	54 min
Jul 24, 8:08 PM MDT	Mesoscale Discussion	SPC	67 min
Jul 25, 1:36 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 25, 9:17 PM MDT	Severe Thunderstorm Warning	UNR	58 min
Jul 25, 9:41 PM MDT	Areal Flood Advisory	UNR	6 hr
Jul 26, 7:07 PM MDT	Severe Thunderstorm Warning	UNR	68 min
Jul 26, 7:46 PM MDT	Severe Thunderstorm Warning	UNR	59 min
Jul 26, 8:02 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 5, 4:58 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 5, 8:40 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 10, 2:11 PM MDT	Flash Flood Watch	UNR	4 hr
Aug 10, 2:53 PM MDT	Severe Thunderstorm Warning	UNR	47 min
Aug 10, 4:16 PM MDT	Areal Flood Advisory	UNR	6 hr
Aug 10, 5:41 PM MDT	Areal Flood Advisory	UNR	12 hr
Aug 13, 5:44 PM MDT	Severe Thunderstorm Warning	UNR	48 min
Aug 24, 1:48 PM MDT	Mesoscale Discussion	SPC	117 min
Aug 26, 1:33 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 26, 3:00 PM MDT	Severe Thunderstorm Warning	UNR	60 min
Sep 21, 1:50 PM MDT	Mesoscale Discussion	SPC	2 hr
Sep 22, 4:21 PM MDT	Mesoscale Discussion	SPC	84 min
Sep 29, 1:49 PM MDT	Frost Advisory	UNR	14 hr
Oct 8, 2:31 PM MDT	Freeze Warning	UNR	12 hr
Oct 10, 3:52 PM MDT	Winter Weather Advisory	UNR	24 hr
Oct 26, 2:30 AM MDT	Wind Advisory	UNR	16 hr
Nov 5, 10:09 AM MST	Winter Weather Advisory	UNR	31 hr
Nov 13, 2:26 PM MST	Wind Advisory	UNR	27 hr
Nov 14, 1:17 PM MST	Mesoscale Discussion	SPC	58 min
Dec 2, 4:05 AM MST	Winter Weather Advisory	UNR	23 hr
Dec 13, 3:56 AM MST	Winter Storm Warning	UNR	29 hr
Dec 13, 5:23 AM MST	Winter Weather Advisory	UNR	13 hr
Dec 13, 5:29 PM MST	Mesoscale Discussion	SPC	4 hr
Dec 14, 8:53 AM MST	Wind Chill Warning	UNR	26 hr
Dec 19, 2:34 PM MST	Wind Chill Warning	UNR	44 hr
Dec 19, 2:34 PM MST	Wind Chill Advisory	UNR	26 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	45
Tornado Warning	4
Severe Thunderstorm Watch	18
Tornado Watch	3
Mesoscale Discussion	41
Flooding
Areal Flood Warning	1
Flash Flood Warning	3
Flash Flood Watch	3
Flood Watch	1
Areal Flood Advisory	11
Winter
Winter Storm Warning	2
Winter Storm Watch	3
Blowing Snow Advisory	1
Snow Advisory	3
Snow and Blowing Snow Advisory	1
Winter Weather Advisory	6
Cold
Freeze Warning	1
Wind Chill Warning	2
Frost Advisory	1
Wind Chill Advisory	3
Wind and dust
Wind 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 2007 2009

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.