Alert archive / South Carolina / Berkeley County

Weather alerts in Berkeley County, South Carolina, 2020

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

Alerts: 169
Warnings: 31
Watches: 10
Advisories: 76
Busiest month: August32 alerts
Busiest day: April 13, 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 Berkeley County in 2020 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 12 minutes after it went out.

Berkeley County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	1	50%	1	100%	12 min
Severe thunderstorm warnings	12	5	58%	17	71%	37 min
Flash flood warnings	0			0

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Charleston, SC: tornado warnings	20	10	50%	19	89%	12 min
NWS Charleston, SC: severe thunderstorm warnings	72	50	31%	301	69%	27 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 4, 2:40 AM EST	Lake Wind Advisory	CHS	25 hr
Jan 12, 7:22 PM EST	Dense Fog Advisory	CHS	15 hr
Jan 13, 9:20 PM EST	Dense Fog Advisory	CHS	9 hr
Jan 16, 3:17 PM EST	Lake Wind Advisory	CHS	22 hr
Jan 21, 3:00 PM EST	Lake Wind Advisory	CHS	19 hr
Jan 24, 4:39 PM EST	Mesoscale Discussion	SPC	2 hr
Feb 6, 3:39 AM EST	Lake Wind Advisory	CHS	10 hr
Feb 6, 1:52 PM EST	Lake Wind Advisory	CHS	14 hr
Feb 6, 1:52 PM EST	Wind Advisory	CHS	9 hr
Feb 6, 5:30 PM EST	Tornado Watch	SPC	7 hr
Feb 6, 11:32 PM EST	Mesoscale Discussion	SPC	118 min
Feb 6, 11:59 PM EST	Severe Thunderstorm Warning	CHS	29 min
Feb 7, 3:48 AM EST	Wind Advisory	CHS	11 hr
Feb 7, 2:52 PM EST	Lake Wind Advisory	CHS	4 hr
Feb 11, 6:33 AM EST	Lake Wind Advisory	CHS	11 hr
Feb 13, 2:17 PM EST	Special Weather Statement	CHS	43 min
Feb 13, 2:59 PM EST	Special Weather Statement	CHS	31 min
Feb 18, 9:41 PM EST	Dense Fog Advisory	CHS	8 hr
Feb 20, 3:16 AM EST	Lake Wind Advisory	CHS	39 hr
Feb 26, 2:56 AM EST	Lake Wind Advisory	CHS	32 hr
Feb 29, 2:25 AM EST	Freeze Watch	CHS	13 hr
Feb 29, 3:12 PM EST	Freeze Warning	CHS	17 hr
Mar 5, 12:38 PM EST	Areal Flood Advisory	CHS	82 min
Mar 5, 2:06 PM EST	Areal Flood Advisory	CHS	114 min
Mar 5, 4:01 PM EST	Areal Flood Advisory	CHS	119 min
Mar 6, 3:24 AM EST	Lake Wind Advisory	CHS	32 hr
Mar 6, 3:10 PM EST	Freeze Watch	CHS	24 hr
Mar 7, 3:08 PM EST	Freeze Warning	CHS	17 hr
Mar 25, 7:02 AM EDT	River Flood Warning	CHS	21 days
Mar 31, 2:22 PM EDT	Tornado Watch	SPC	6 hr
Mar 31, 5:32 PM EDT	Special Weather Statement	CHS	28 min
Apr 9, 3:56 AM EDT	Lake Wind Advisory	CHS	16 hr
Apr 12, 3:40 AM EDT	Lake Wind Advisory	CHS	20 hr
Apr 12, 3:09 PM EDT	Wind Advisory	CHS	19 hr
Apr 13, 3:20 AM EDT	Tornado Watch	SPC	8 hr
Apr 13, 6:17 AM EDT	Mesoscale Discussion	SPC	88 min
Apr 13, 6:53 AM EDT	Severe Thunderstorm Warning	CHS	52 min
Apr 13, 7:26 AM EDT	Tornado Warning	CHS	34 min
Apr 13, 7:42 AM EDT	Severe Thunderstorm Warning	CHS	63 min
Apr 13, 7:54 AM EDT	Tornado Warning Tornado observed	CHS	18 min
Apr 13, 8:42 AM EDT	Severe Thunderstorm Warning	CHS	33 min
Apr 20, 1:52 AM EDT	Mesoscale Discussion	SPC	83 min
Apr 21, 10:14 AM EDT	River Flood Warning	CHS	6 days
Apr 23, 3:13 AM EDT	Lake Wind Advisory	CHS	13 hr
Apr 23, 2:22 PM EDT	Mesoscale Discussion	SPC	83 min
Apr 23, 5:31 PM EDT	Areal Flood Advisory	CHS	89 min
Apr 23, 6:45 PM EDT	Areal Flood Advisory	CHS	6 hr
Apr 26, 3:28 AM EDT	Lake Wind Advisory	CHS	31 hr
Apr 27, 8:36 PM EDT	River Flood Warning	CHS	17 hr
Apr 29, 3:39 AM EDT	Lake Wind Advisory	CHS	27 hr
Apr 30, 2:55 AM EDT	Special Weather Statement	CHS	35 min
Apr 30, 4:44 AM EDT	Special Weather Statement	CHS	31 min
May 1, 9:34 PM EDT	River Flood Warning	CHS	14 days
May 6, 1:29 AM EDT	Lake Wind Advisory	CHS	29 hr
May 19, 9:24 PM EDT	River Flood Warning	CHS	29 days
May 20, 10:12 AM EDT	Mesoscale Discussion	SPC	2 hr
May 20, 12:09 PM EDT	Severe Thunderstorm Warning	CHS	66 min
May 20, 12:15 PM EDT	Areal Flood Advisory	CHS	90 min
May 20, 1:31 PM EDT	Areal Flood Advisory	CHS	89 min
May 21, 3:55 PM EDT	Special Weather Statement	CHS	50 min
May 22, 3:50 PM EDT	Special Weather Statement	CHS	25 min
May 22, 4:03 PM EDT	Severe Thunderstorm Warning	CHS	42 min
May 22, 4:45 PM EDT	Special Weather Statement	CHS	30 min
May 22, 5:14 PM EDT	Special Weather Statement	CHS	31 min
May 22, 7:17 PM EDT	Severe Thunderstorm Warning	CHS	58 min
May 24, 3:42 PM EDT	Special Weather Statement	CHS	33 min
May 27, 6:10 AM EDT	Areal Flood Advisory	CHS	3 hr
May 27, 8:23 AM EDT	Tropical Storm Warning	CHS	5 hr
May 27, 9:09 AM EDT	Areal Flood Advisory	CHS	81 min
May 27, 10:24 AM EDT	Areal Flood Advisory	CHS	111 min
May 27, 12:10 PM EDT	Areal Flood Advisory	CHS	28 min
May 31, 6:00 PM EDT	Areal Flood Advisory	CHS	60 min
Jun 8, 3:33 PM EDT	Areal Flood Advisory	CHS	87 min
Jun 11, 3:18 PM EDT	Areal Flood Advisory	CHS	53 min
Jun 12, 3:28 AM EDT	Flash Flood Watch	CHS	9 hr
Jun 15, 3:36 AM EDT	Flash Flood Watch	CHS	4 hr
Jun 15, 5:44 AM EDT	Areal Flood Advisory	CHS	2 hr
Jun 19, 2:40 PM EDT	Special Weather Statement	CHS	50 min
Jun 19, 3:57 PM EDT	Special Weather Statement	CHS	33 min
Jun 22, 5:38 PM EDT	Special Weather Statement	CHS	37 min
Jun 24, 2:42 PM EDT	Special Weather Statement	CHS	48 min
Jun 24, 3:31 PM EDT	Special Weather Statement	CHS	44 min
Jun 24, 6:27 PM EDT	Mesoscale Discussion	SPC	93 min
Jun 26, 8:17 PM EDT	Special Weather Statement	CHS	43 min
Jun 27, 9:28 PM EDT	Special Weather Statement	CHS	47 min
Jun 28, 5:33 PM EDT	Mesoscale Discussion	SPC	87 min
Jun 30, 3:29 AM EDT	Heat Advisory	CHS	15 hr
Jul 2, 4:13 PM EDT	Special Weather Statement	CHS	32 min
Jul 13, 7:00 PM EDT	Special Weather Statement	CHS	45 min
Jul 13, 7:42 PM EDT	Special Weather Statement	CHS	48 min
Jul 24, 12:07 PM EDT	Special Weather Statement	CHS	23 min
Jul 24, 3:31 PM EDT	Special Weather Statement	CHS	44 min
Jul 25, 2:56 PM EDT	Areal Flood Advisory	CHS	73 min
Jul 28, 4:13 PM EDT	Areal Flood Advisory	CHS	2 hr
Aug 1, 11:13 AM EDT	Tropical Storm Watch	CHS	18 hr
Aug 1, 1:23 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 3:51 PM EDT	Special Weather Statement	CHS	39 min
Aug 2, 5:04 AM EDT	Flash Flood Watch	CHS	42 hr
Aug 2, 5:21 AM EDT	Tropical Storm Warning	CHS	44 hr
Aug 3, 9:36 AM EDT	River Flood Warning	CHS	36 hr
Aug 3, 4:42 PM EDT	Areal Flood Advisory	CHS	3 hr
Aug 5, 12:39 PM EDT	Special Weather Statement	CHS	51 min
Aug 5, 1:04 PM EDT	Areal Flood Advisory	CHS	116 min
Aug 6, 3:08 PM EDT	Special Weather Statement	CHS	52 min
Aug 13, 4:36 PM EDT	Special Weather Statement	CHS	24 min
Aug 13, 4:53 PM EDT	Severe Thunderstorm Warning	CHS	67 min
Aug 13, 6:29 PM EDT	Areal Flood Advisory	CHS	91 min
Aug 13, 7:48 PM EDT	Areal Flood Advisory	CHS	54 min
Aug 15, 4:06 PM EDT	Areal Flood Advisory	CHS	3 hr
Aug 15, 5:35 PM EDT	Areal Flood Advisory	CHS	85 min
Aug 18, 5:58 PM EDT	Special Weather Statement	CHS	32 min
Aug 18, 6:34 PM EDT	Special Weather Statement	CHS	26 min
Aug 19, 4:05 PM EDT	Severe Thunderstorm Warning	CHS	55 min
Aug 19, 6:37 PM EDT	Special Weather Statement	CHS	38 min
Aug 19, 11:47 PM EDT	Special Weather Statement	CHS	28 min
Aug 20, 12:04 AM EDT	Special Weather Statement	CHS	26 min
Aug 20, 12:34 AM EDT	Special Weather Statement	CHS	41 min
Aug 21, 7:41 AM EDT	Severe Thunderstorm Warning	CHS	34 min
Aug 24, 5:28 PM EDT	Special Weather Statement	CHS	32 min
Aug 24, 6:58 PM EDT	Areal Flood Advisory	CHS	2 hr
Aug 24, 7:37 PM EDT	Areal Flood Advisory	CHS	113 min
Aug 24, 8:22 PM EDT	Areal Flood Advisory	CHS	3 hr
Aug 25, 10:11 AM EDT	River Flood Warning	CHS	6 days
Aug 25, 4:35 PM EDT	Areal Flood Advisory	CHS	70 min
Aug 29, 3:45 AM EDT	Lake Wind Advisory	CHS	15 hr
Aug 31, 10:35 AM EDT	River Flood Warning	CHS	34 hr
Sep 2, 10:40 AM EDT	Heat Advisory	CHS	8 hr
Sep 3, 3:26 AM EDT	Heat Advisory	CHS	16 hr
Sep 16, 3:48 PM EDT	Areal Flood Advisory	CHS	3 hr
Sep 16, 10:51 PM EDT	Areal Flood Advisory	CHS	55 min
Sep 17, 10:27 AM EDT	Mesoscale Discussion	SPC	2 hr
Sep 17, 3:34 PM EDT	Special Weather Statement	CHS	26 min
Sep 17, 9:43 PM EDT	River Flood Warning	CHS	13 days
Sep 18, 9:23 PM EDT	Lake Wind Advisory	CHS	14 hr
Sep 20, 3:17 AM EDT	Lake Wind Advisory	CHS	11 hr
Sep 20, 5:21 PM EDT	Lake Wind Advisory	CHS	21 hr
Sep 25, 1:09 PM EDT	Mesoscale Discussion	SPC	3 hr
Sep 25, 6:32 PM EDT	Mesoscale Discussion	SPC	88 min
Sep 29, 2:36 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 29, 4:30 PM EDT	Lake Wind Advisory	CHS	4 hr
Sep 29, 5:03 PM EDT	Special Weather Statement	CHS	42 min
Sep 29, 5:31 PM EDT	Severe Thunderstorm Warning	CHS	29 min
Oct 8, 4:20 AM EDT	Dense Fog Advisory	CHS	5 hr
Oct 13, 9:23 PM EDT	River Flood Warning	CHS	10 days
Oct 15, 5:52 PM EDT	Special Weather Statement	CHS	23 min
Oct 28, 4:20 PM EDT	Lake Wind Advisory	CHS	40 hr
Nov 1, 2:47 AM EST	Lake Wind Advisory	CHS	32 hr
Nov 2, 3:30 AM EST	Frost Advisory	CHS	28 hr
Nov 2, 10:41 PM EST	River Flood Warning	CHS	3 days
Nov 11, 9:54 AM EST	River Flood Warning	CHS	73 days
Nov 11, 5:36 PM EST	Areal Flood Advisory	CHS	114 min
Nov 12, 4:25 AM EST	Flash Flood Watch	CHS	16 hr
Nov 12, 2:01 PM EST	Areal Flood Advisory	CHS	119 min
Nov 12, 3:38 PM EST	Areal Flood Advisory	CHS	3 hr
Nov 12, 4:46 PM EST	Special Weather Statement	CHS	44 min
Nov 12, 4:54 PM EST	Areal Flood Advisory	CHS	3 hr
Nov 12, 6:24 PM EST	Lake Wind Advisory	CHS	4 hr
Nov 14, 2:12 AM EST	Dense Fog Advisory	CHS	6 hr
Nov 18, 3:32 PM EST	Frost Advisory	CHS	16 hr
Nov 18, 10:00 PM EST	Freeze Warning	CHS	9 hr
Nov 23, 12:52 AM EST	Dense Fog Advisory	CHS	5 hr
Nov 29, 3:18 PM EST	Lake Wind Advisory	CHS	43 hr
Dec 7, 3:08 PM EST	Lake Wind Advisory	CHS	9 hr
Dec 14, 3:23 AM EST	Lake Wind Advisory	CHS	22 hr
Dec 21, 3:09 PM EST	Lake Wind Advisory	CHS	12 hr
Dec 23, 3:22 PM EST	Lake Wind Advisory	CHS	51 hr
Dec 24, 7:13 PM EST	Mesoscale Discussion	SPC	2 hr
Dec 24, 7:22 PM EST	Special Weather Statement	CHS	38 min
Dec 24, 7:38 PM EST	Severe Thunderstorm Warning	CHS	52 min

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
Tornado Warning	2
Tornado Watch	3
Mesoscale Discussion	14
Special Weather Statement	38
Flooding
River Flood Warning	12
Flash Flood Watch	4
Areal Flood Advisory	33
Heat
Heat Advisory	3
Cold
Freeze Warning	3
Freeze Watch	2
Frost Advisory	2
Wind and dust
Lake Wind Advisory	29
Wind Advisory	3
Fog and smoke
Dense Fog Advisory	6
Tropical
Tropical Storm Warning	2
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 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.