Alert archive / South Carolina / Berkeley County

Weather alerts in Berkeley County, South Carolina, 2017

181 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Berkeley County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts: 181
Warnings: 33
Watches: 18
Advisories: 61
Busiest month: July24 alerts
Busiest day: September 11, 20178 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 Berkeley County in 2017 had a tornado report inside them.

Berkeley County, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	1	75%	0
Severe thunderstorm warnings	18	10	44%	12	75%	20 min
Flash flood warnings	2	1	50%	0

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Charleston, SC: tornado warnings	35	10	71%	25	64%	9 min
NWS Charleston, SC: severe thunderstorm warnings	102	64	37%	213	67%	21 min
NWS Charleston, SC: flash flood warnings	10	5	50%	6	100%	247 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 3, 2:39 AM EST	Severe Thunderstorm Warning	CHS	49 min
Jan 6, 3:38 AM EST	Lake Wind Advisory	CHS	43 hr
Jan 16, 1:20 AM EST	Dense Fog Advisory	CHS	10 hr
Jan 17, 3:20 AM EST	Dense Fog Advisory	CHS	8 hr
Jan 21, 1:51 PM EST	Tornado Watch	SPC	4 hr
Jan 21, 3:56 PM EST	Severe Thunderstorm Warning	CHS	49 min
Jan 21, 5:04 PM EST	Special Weather Statement	CHS	26 min
Jan 22, 3:48 AM EST	Lake Wind Advisory	CHS	47 hr
Jan 22, 4:02 PM EST	Mesoscale Discussion	SPC	88 min
Jan 22, 4:25 PM EST	Tornado Watch PDS	SPC	3 hr
Jan 22, 6:58 PM EST	Mesoscale Discussion	SPC	92 min
Jan 25, 3:44 PM EST	Lake Wind Advisory	CHS	26 hr
Jan 29, 3:31 AM EST	Lake Wind Advisory	CHS	24 hr
Feb 8, 3:27 PM EST	Lake Wind Advisory	CHS	27 hr
Feb 9, 3:12 AM EST	Mesoscale Discussion	SPC	2 hr
Feb 15, 10:19 AM EST	Mesoscale Discussion	SPC	2 hr
Feb 15, 10:54 AM EST	Severe Thunderstorm Warning	CHS	35 min
Feb 15, 11:45 AM EST	Severe Thunderstorm Warning	CHS	45 min
Feb 15, 11:57 AM EST	Tornado Warning	CHS	33 min
Feb 15, 12:21 PM EST	Tornado Warning	CHS	24 min
Feb 25, 3:15 AM EST	Lake Wind Advisory	CHS	18 hr
Mar 3, 3:33 AM EST	Freeze Watch	CHS	12 hr
Mar 3, 3:08 PM EST	Freeze Warning	CHS	17 hr
Mar 4, 3:15 PM EST	Freeze Warning	CHS	18 hr
Mar 13, 3:45 PM EDT	Freeze Watch	CHS	12 hr
Mar 14, 3:25 AM EDT	Freeze Warning	CHS	30 hr
Mar 14, 3:25 AM EDT	Lake Wind Advisory	CHS	30 hr
Mar 15, 10:14 AM EDT	Freeze Warning	CHS	24 hr
Mar 16, 10:53 AM EDT	Freeze Warning	CHS	23 hr
Mar 19, 9:45 PM EDT	Frost Advisory	CHS	10 hr
Mar 21, 8:35 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Mar 21, 11:18 PM EDT	Mesoscale Discussion	SPC	57 min
Mar 22, 12:50 AM EDT	Severe Thunderstorm Warning	CHS	44 min
Mar 24, 6:16 PM EDT	Dense Smoke Advisory	CHS	15 hr
Mar 31, 12:53 AM EDT	Mesoscale Discussion	SPC	2 hr
Mar 31, 3:45 AM EDT	Special Weather Statement	CHS	30 min
Mar 31, 7:54 AM EDT	Special Weather Statement	CHS	36 min
Apr 3, 3:37 AM EDT	Lake Wind Advisory	CHS	19 hr
Apr 3, 4:00 PM EDT	Mesoscale Discussion	SPC	90 min
Apr 3, 4:36 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Apr 3, 6:10 PM EDT	Severe Thunderstorm Warning	CHS	65 min
Apr 3, 6:36 PM EDT	Severe Thunderstorm Warning	CHS	54 min
Apr 3, 6:41 PM EDT	Mesoscale Discussion	SPC	64 min
Apr 5, 12:54 PM EDT	Tornado Watch PDS	SPC	10 hr
Apr 5, 2:44 PM EDT	Wind Advisory	CHS	29 hr
Apr 5, 3:38 PM EDT	Tornado Warning	CHS	37 min
Apr 5, 4:19 PM EDT	Special Weather Statement	CHS	26 min
Apr 5, 4:23 PM EDT	Mesoscale Discussion	SPC	97 min
Apr 5, 6:29 PM EDT	Mesoscale Discussion	SPC	61 min
Apr 5, 7:56 PM EDT	Severe Thunderstorm Warning	CHS	64 min
Apr 6, 3:10 AM EDT	Areal Flood Advisory	CHS	2 hr
Apr 6, 4:33 AM EDT	Special Weather Statement	CHS	42 min
Apr 6, 7:18 PM EDT	Lake Wind Advisory	CHS	27 hr
Apr 18, 6:39 PM EDT	Special Weather Statement	CHS	36 min
Apr 23, 2:24 PM EDT	Mesoscale Discussion	SPC	3 hr
Apr 23, 3:29 PM EDT	Flash Flood Watch	CHS	33 hr
Apr 23, 10:32 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 24, 8:10 AM EDT	Areal Flood Advisory	CHS	65 min
Apr 24, 9:13 AM EDT	Areal Flood Advisory	CHS	2 hr
Apr 26, 2:42 AM EDT	River Flood Warning	CHS	13 days
May 1, 3:29 AM EDT	Lake Wind Advisory	CHS	8 hr
May 1, 11:45 AM EDT	Wind Advisory	CHS	8 hr
May 4, 7:16 PM EDT	Mesoscale Discussion	SPC	89 min
May 4, 8:49 PM EDT	Tornado Watch	SPC	6 hr
May 4, 9:49 PM EDT	Special Weather Statement	CHS	26 min
May 5, 2:27 AM EDT	Special Weather Statement	CHS	48 min
May 12, 6:33 PM EDT	Mesoscale Discussion	SPC	2 hr
May 13, 3:37 PM EDT	Areal Flood Advisory	CHS	53 min
May 22, 5:38 PM EDT	Areal Flood Advisory	CHS	67 min
May 23, 3:34 AM EDT	Flash Flood Watch	CHS	20 hr
May 23, 1:28 PM EDT	Areal Flood Advisory	CHS	92 min
May 23, 2:02 PM EDT	Mesoscale Discussion	SPC	118 min
May 23, 2:45 PM EDT	Tornado Watch	SPC	8 hr
May 23, 4:38 PM EDT	Areal Flood Advisory	CHS	52 min
May 23, 4:50 PM EDT	Mesoscale Discussion	SPC	85 min
May 24, 8:29 AM EDT	Mesoscale Discussion	SPC	3 hr
May 24, 11:03 AM EDT	Tornado Watch	SPC	10 hr
May 24, 2:10 PM EDT	Mesoscale Discussion	SPC	95 min
May 24, 2:30 PM EDT	Special Weather Statement	CHS	45 min
May 25, 7:38 AM EDT	River Flood Warning	CHS	9 days
May 28, 7:06 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
May 28, 8:20 PM EDT	Mesoscale Discussion	SPC	85 min
May 31, 6:55 PM EDT	Special Weather Statement	CHS	50 min
Jun 1, 4:33 PM EDT	Special Weather Statement	CHS	42 min
Jun 1, 5:14 PM EDT	Special Weather Statement	CHS	46 min
Jun 5, 3:36 PM EDT	Areal Flood Advisory	CHS	2 hr
Jun 6, 3:05 PM EDT	Areal Flood Advisory	CHS	2 hr
Jun 6, 5:17 PM EDT	Areal Flood Advisory	CHS	2 hr
Jun 14, 1:17 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 15, 2:38 PM EDT	Special Weather Statement	CHS	22 min
Jun 15, 4:02 PM EDT	Severe Thunderstorm Warning	CHS	43 min
Jun 15, 4:47 PM EDT	Areal Flood Advisory	CHS	88 min
Jun 16, 1:27 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 17, 2:47 PM EDT	Areal Flood Advisory	CHS	88 min
Jun 19, 3:59 PM EDT	Special Weather Statement	CHS	46 min
Jun 22, 5:27 PM EDT	Areal Flood Advisory	CHS	2 hr
Jun 30, 3:54 PM EDT	Special Weather Statement	CHS	36 min
Jul 3, 7:47 AM EDT	Areal Flood Advisory	CHS	118 min
Jul 7, 3:18 PM EDT	Special Weather Statement	CHS	42 min
Jul 7, 3:26 PM EDT	Severe Thunderstorm Warning	CHS	64 min
Jul 7, 5:40 PM EDT	Severe Thunderstorm Warning	CHS	65 min
Jul 8, 4:48 PM EDT	Special Weather Statement	CHS	42 min
Jul 8, 8:59 PM EDT	Severe Thunderstorm Warning	CHS	61 min
Jul 8, 9:59 PM EDT	Severe Thunderstorm Warning	CHS	61 min
Jul 15, 4:10 PM EDT	Special Weather Statement	CHS	35 min
Jul 15, 4:45 PM EDT	Special Weather Statement	CHS	30 min
Jul 15, 5:01 PM EDT	Special Weather Statement	CHS	29 min
Jul 15, 5:27 PM EDT	Special Weather Statement	CHS	33 min
Jul 16, 2:57 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 16, 9:32 PM EDT	Special Weather Statement	CHS	43 min
Jul 19, 3:21 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 19, 4:38 PM EDT	Special Weather Statement	CHS	22 min
Jul 19, 4:43 PM EDT	Special Weather Statement	CHS	32 min
Jul 19, 4:56 PM EDT	Severe Thunderstorm Warning	CHS	46 min
Jul 19, 5:11 PM EDT	Areal Flood Advisory	CHS	94 min
Jul 23, 4:49 PM EDT	Special Weather Statement	CHS	41 min
Jul 24, 4:34 PM EDT	Special Weather Statement	CHS	41 min
Jul 24, 5:19 PM EDT	Special Weather Statement	CHS	41 min
Jul 26, 6:45 AM EDT	Areal Flood Advisory	CHS	60 min
Jul 26, 1:33 PM EDT	Special Weather Statement	CHS	27 min
Jul 28, 7:18 PM EDT	Special Weather Statement	CHS	27 min
Aug 3, 4:58 AM EDT	Areal Flood Advisory	CHS	4 hr
Aug 4, 7:43 PM EDT	Special Weather Statement	CHS	47 min
Aug 6, 6:58 PM EDT	Special Weather Statement	CHS	32 min
Aug 12, 1:05 AM EDT	Areal Flood Advisory	CHS	55 min
Aug 12, 1:58 AM EDT	Areal Flood Advisory	CHS	62 min
Aug 13, 2:44 PM EDT	Special Weather Statement	CHS	31 min
Aug 13, 5:20 PM EDT	Special Weather Statement	CHS	40 min
Aug 16, 9:59 AM EDT	Heat Advisory	CHS	9 hr
Aug 17, 3:09 AM EDT	Heat Advisory	CHS	10 hr
Aug 17, 3:15 PM EDT	Special Weather Statement	CHS	30 min
Aug 21, 2:29 PM EDT	Areal Flood Advisory	CHS	2 hr
Aug 23, 3:14 PM EDT	Mesoscale Discussion	SPC	91 min
Aug 23, 8:59 PM EDT	Special Weather Statement	CHS	46 min
Aug 24, 4:33 PM EDT	Areal Flood Advisory	CHS	87 min
Aug 28, 2:48 PM EDT	Areal Flood Advisory	CHS	87 min
Aug 28, 3:13 PM EDT	Areal Flood Advisory	CHS	62 min
Aug 28, 3:21 PM EDT	Areal Flood Advisory	CHS	54 min
Aug 28, 3:33 PM EDT	Lake Wind Advisory	CHS	12 hr
Aug 28, 4:12 PM EDT	Areal Flood Advisory	CHS	2 hr
Aug 28, 6:14 PM EDT	Areal Flood Advisory	CHS	61 min
Aug 28, 8:45 PM EDT	Areal Flood Advisory	CHS	2 hr
Aug 31, 6:41 PM EDT	Special Weather Statement	CHS	34 min
Sep 1, 3:06 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 2, 3:55 AM EDT	Severe Thunderstorm Warning	CHS	65 min
Sep 2, 4:25 AM EDT	Severe Thunderstorm Warning	CHS	37 min
Sep 2, 4:46 AM EDT	Areal Flood Advisory	CHS	89 min
Sep 6, 3:29 PM EDT	Special Weather Statement	CHS	31 min
Sep 6, 6:32 PM EDT	Special Weather Statement	CHS	43 min
Sep 9, 4:37 AM EDT	Tropical Storm Watch	CHS	13 hr
Sep 9, 10:37 AM EDT	Tropical Storm Warning	CHS	61 hr
Sep 9, 3:31 PM EDT	Flash Flood Watch	CHS	58 hr
Sep 10, 11:50 PM EDT	Tornado Watch	SPC	14 hr
Sep 11, 8:49 AM EDT	Mesoscale Discussion	SPC	116 min
Sep 11, 10:45 AM EDT	River Flood Warning	CHS	24 hr
Sep 11, 11:24 AM EDT	Flash Flood Warning Emergency	CHS	15 hr
Sep 11, 1:46 PM EDT	Tornado Watch	SPC	10 hr
Sep 11, 2:46 PM EDT	Tornado Warning	CHS	16 min
Sep 11, 3:10 PM EDT	Flash Flood Warning	CHS	7 hr
Sep 11, 5:45 PM EDT	Mesoscale Discussion	SPC	60 min
Sep 11, 9:11 PM EDT	Mesoscale Discussion	SPC	64 min
Sep 21, 6:27 PM EDT	Special Weather Statement	CHS	18 min
Oct 12, 8:06 PM EDT	Special Weather Statement	CHS	24 min
Oct 16, 3:33 AM EDT	Lake Wind Advisory	CHS	28 hr
Oct 16, 5:43 AM EDT	Dense Fog Advisory	CHS	4 hr
Oct 23, 2:00 PM EDT	Tornado Watch	SPC	8 hr
Oct 23, 3:05 PM EDT	Severe Thunderstorm Warning	CHS	24 min
Oct 23, 6:59 PM EDT	Mesoscale Discussion	SPC	91 min
Oct 23, 7:58 PM EDT	Severe Thunderstorm Warning	CHS	62 min
Oct 23, 8:55 PM EDT	Areal Flood Advisory	CHS	95 min
Oct 29, 3:14 AM EDT	Lake Wind Advisory	CHS	24 hr
Nov 5, 8:57 PM EST	Dense Fog Advisory	CHS	13 hr
Nov 10, 2:45 PM EST	Lake Wind Advisory	CHS	21 hr
Nov 19, 2:33 PM EST	Frost Advisory	CHS	18 hr
Nov 20, 9:59 PM EST	Frost Advisory	CHS	6 hr
Nov 24, 9:30 PM EST	Frost Advisory	CHS	12 hr
Nov 26, 3:33 PM EST	Frost Advisory	CHS	17 hr
Nov 27, 3:52 PM EST	Frost Advisory	CHS	15 hr
Dec 12, 3:42 AM EST	Lake Wind Advisory	CHS	24 hr
Dec 24, 2:35 PM EST	Lake Wind Advisory	CHS	16 hr
Dec 28, 3:49 AM EST	Winter Weather Advisory	CHS	29 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	18
Tornado Warning	4
Severe Thunderstorm Watch	3
Tornado Watch	9
Mesoscale Discussion	29
Special Weather Statement	40
Flooding
Flash Flood Warning	2
River Flood Warning	3
Flash Flood Watch	3
Areal Flood Advisory	29
Winter
Winter Weather Advisory	1
Heat
Heat Advisory	2
Cold
Freeze Warning	5
Freeze Watch	2
Frost Advisory	6
Wind and dust
Lake Wind Advisory	16
Wind Advisory	2
Fog and smoke
Dense Fog Advisory	4
Dense Smoke Advisory	1
Tropical
Tropical Storm Warning	1
Tropical Storm Watch	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2016 2018

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.