Alert archive / Mississippi / Calhoun County

Weather alerts in Calhoun County, Mississippi, 2009

154 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Calhoun County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts: 154
Warnings: 45
Watches: 38
Advisories: 32
Busiest month: May31 alerts
Busiest day: May 6, 200917 alerts

Over time

By month

Warning verification

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

0 of 1 tornado reports fell inside a warning.

Calhoun County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			1	0%
Severe thunderstorm warnings	26	18	31%	14	64%	18 min
Flash flood warnings	14	11	21%	3	100%	36 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Memphis, TN: tornado warnings	69	19	72%	51	65%	19 min
NWS Memphis, TN: severe thunderstorm warnings	439	207	53%	423	82%	24 min
NWS Memphis, TN: flash flood warnings	235	126	46%	204	92%	94 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 2, 10:01 PM CST	Dense Fog Advisory	MEG	12 hr
Jan 3, 4:10 PM CST	Severe Thunderstorm Warning	MEG	35 min
Jan 5, 4:10 AM CST	Flash Flood Watch	MEG	38 hr
Feb 10, 3:31 AM CST	Wind Advisory	MEG	39 hr
Feb 17, 9:45 PM CST	Mesoscale Discussion	SPC	2 hr
Feb 18, 11:14 AM CST	Mesoscale Discussion	SPC	91 min
Feb 27, 6:49 AM CST	Flash Flood Warning	MEG	3 hr
Feb 27, 8:29 AM CST	Mesoscale Discussion	SPC	31 min
Feb 27, 8:40 AM CST	Severe Thunderstorm Watch	SPC	6 hr
Feb 27, 10:15 AM CST	Mesoscale Discussion	SPC	90 min
Feb 27, 12:41 PM CST	Areal Flood Advisory	MEG	3 hr
Feb 27, 3:14 PM CST	Flash Flood Watch	MEG	14 hr
Feb 27, 8:48 PM CST	Mesoscale Discussion	SPC	117 min
Feb 27, 9:33 PM CST	Winter Weather Advisory	MEG	6 hr
Feb 28, 3:59 AM CST	Winter Storm Warning	MEG	28 hr
Mar 15, 3:56 AM CDT	Dense Fog Advisory	MEG	6 hr
Mar 16, 9:39 PM CDT	Dense Fog Advisory	MEG	12 hr
Mar 17, 11:27 PM CDT	Dense Fog Advisory	MEG	10 hr
Mar 25, 5:10 AM CDT	Flash Flood Watch	MEG	23 hr
Mar 27, 3:11 PM CDT	Flash Flood Watch	MEG	14 hr
Mar 29, 4:41 AM CDT	Frost Advisory	MEG	28 hr
Apr 2, 10:53 AM CDT	Tornado Watch	SPC	4 hr
Apr 2, 5:36 PM CDT	Mesoscale Discussion	SPC	84 min
Apr 2, 6:21 PM CDT	Tornado Watch	SPC	3 hr
Apr 5, 4:05 AM CDT	Freeze Watch	MEG	24 hr
Apr 5, 4:05 AM CDT	Wind Advisory	MEG	24 hr
Apr 6, 3:52 AM CDT	Freeze Warning	MEG	27 hr
Apr 10, 1:24 AM CDT	Mesoscale Discussion	SPC	96 min
Apr 10, 1:42 AM CDT	Severe Thunderstorm Warning	MEG	63 min
Apr 10, 1:43 AM CDT	Tornado Watch	SPC	5 hr
Apr 10, 8:22 AM CDT	Mesoscale Discussion	SPC	83 min
Apr 10, 8:53 AM CDT	Tornado Watch	SPC	7 hr
Apr 10, 11:30 AM CDT	Severe Thunderstorm Warning	MEG	60 min
Apr 10, 1:13 PM CDT	Wind Advisory	MEG	6 hr
Apr 19, 1:17 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 19, 2:22 PM CDT	Mesoscale Discussion	SPC	53 min
Apr 19, 3:16 PM CDT	Severe Thunderstorm Warning	MEG	44 min
Apr 19, 3:44 PM CDT	Severe Thunderstorm Warning	MEG	46 min
Apr 19, 3:49 PM CDT	Mesoscale Discussion	SPC	56 min
Apr 19, 5:47 PM CDT	Mesoscale Discussion	SPC	58 min
Apr 30, 3:34 PM CDT	Mesoscale Discussion	SPC	86 min
May 1, 3:40 PM CDT	Flash Flood Watch	MEG	55 hr
May 2, 1:45 AM CDT	Mesoscale Discussion	SPC	90 min
May 2, 2:38 PM CDT	Mesoscale Discussion	SPC	97 min
May 2, 2:55 PM CDT	Tornado Watch	SPC	6 hr
May 2, 5:22 PM CDT	Mesoscale Discussion	SPC	53 min
May 2, 7:30 PM CDT	Mesoscale Discussion	SPC	60 min
May 5, 4:13 AM CDT	Flash Flood Watch	MEG	35 hr
May 5, 10:07 PM CDT	Mesoscale Discussion	SPC	83 min
May 5, 10:27 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 5, 11:33 PM CDT	Areal Flood Advisory	MEG	57 min
May 6, 12:04 AM CDT	Severe Thunderstorm Warning	MEG	41 min
May 6, 12:23 AM CDT	Flash Flood Warning	MEG	12 hr
May 6, 12:53 AM CDT	Mesoscale Discussion	SPC	37 min
May 6, 12:54 AM CDT	Tornado Watch	SPC	5 hr
May 6, 1:20 AM CDT	Severe Thunderstorm Warning	MEG	70 min
May 6, 1:27 AM CDT	Mesoscale Discussion	SPC	3 hr
May 6, 3:05 AM CDT	Mesoscale Discussion	SPC	115 min
May 6, 4:15 AM CDT	Severe Thunderstorm Warning	MEG	60 min
May 6, 4:42 AM CDT	Severe Thunderstorm Warning	MEG	48 min
May 6, 5:07 AM CDT	Severe Thunderstorm Warning	MEG	68 min
May 6, 5:10 AM CDT	Severe Thunderstorm Warning	MEG	65 min
May 6, 5:45 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 6, 12:23 PM CDT	Flash Flood Warning	MEG	118 min
May 6, 2:25 PM CDT	Areal Flood Warning	MEG	8 hr
May 8, 8:29 PM CDT	Flash Flood Watch	MEG	47 hr
May 9, 5:31 PM CDT	Mesoscale Discussion	SPC	89 min
May 10, 11:17 AM CDT	Mesoscale Discussion	SPC	118 min
May 12, 6:38 PM CDT	Mesoscale Discussion	SPC	97 min
May 15, 4:03 PM CDT	Flash Flood Watch	MEG	27 hr
May 16, 3:34 PM CDT	Severe Thunderstorm Warning	MEG	24 min
May 23, 3:47 AM CDT	Flash Flood Watch	MEG	27 hr
Jun 10, 1:12 AM CDT	Mesoscale Discussion	SPC	33 min
Jun 10, 1:29 AM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jun 10, 4:41 AM CDT	Mesoscale Discussion	SPC	34 min
Jun 11, 2:38 AM CDT	Mesoscale Discussion	SPC	67 min
Jun 12, 10:03 AM CDT	Mesoscale Discussion	SPC	87 min
Jun 12, 11:35 AM CDT	Severe Thunderstorm Watch PDS	SPC	9 hr
Jun 12, 2:07 PM CDT	Severe Thunderstorm Warning	MEG	38 min
Jun 12, 2:43 PM CDT	Severe Thunderstorm Warning	MEG	47 min
Jun 12, 3:16 PM CDT	Areal Flood Advisory	MEG	119 min
Jun 12, 3:22 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 12, 3:26 PM CDT	Severe Thunderstorm Warning	MEG	23 min
Jun 12, 5:24 PM CDT	Severe Thunderstorm Warning	MEG	51 min
Jun 12, 5:24 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 12, 5:35 PM CDT	Flash Flood Warning	MEG	3 hr
Jun 12, 5:50 PM CDT	Severe Thunderstorm Warning	MEG	40 min
Jun 13, 9:04 AM CDT	Flash Flood Warning	MEG	3 hr
Jun 13, 5:07 PM CDT	Mesoscale Discussion	SPC	53 min
Jun 14, 8:38 AM CDT	Mesoscale Discussion	SPC	97 min
Jun 14, 8:50 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 17, 3:12 PM CDT	Heat Advisory	MEG	5 days
Jun 23, 3:26 AM CDT	Heat Advisory	MEG	16 hr
Jun 23, 11:27 AM CDT	Excessive Heat Warning	MEG	8 hr
Jun 26, 3:17 AM CDT	Heat Advisory	MEG	61 hr
Jun 28, 2:20 PM CDT	Severe Thunderstorm Warning	MEG	55 min
Jun 28, 2:53 PM CDT	Severe Thunderstorm Warning	MEG	52 min
Jun 28, 3:52 PM CDT	Mesoscale Discussion	SPC	53 min
Jul 13, 5:39 AM CDT	Severe Thunderstorm Warning	MEG	66 min
Jul 13, 5:46 AM CDT	Areal Flood Advisory	MEG	3 hr
Jul 13, 11:03 AM CDT	Severe Thunderstorm Warning	MEG	42 min
Jul 13, 11:31 AM CDT	Severe Thunderstorm Warning	MEG	44 min
Jul 15, 3:40 AM CDT	Heat Advisory	MEG	15 hr
Jul 16, 3:32 AM CDT	Heat Advisory	MEG	6 hr
Jul 16, 10:06 PM CDT	Mesoscale Discussion	SPC	54 min
Jul 16, 10:51 PM CDT	Severe Thunderstorm Warning	MEG	54 min
Jul 16, 11:12 PM CDT	Areal Flood Advisory	MEG	2 hr
Jul 21, 10:06 AM CDT	Flash Flood Watch	MEG	17 hr
Jul 23, 3:17 AM CDT	Dense Fog Advisory	MEG	6 hr
Jul 28, 3:32 AM CDT	Flash Flood Watch	MEG	15 hr
Jul 29, 3:13 PM CDT	Flash Flood Watch	MEG	37 hr
Jul 30, 3:42 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jul 30, 4:10 PM CDT	Tornado Watch	SPC	6 hr
Jul 30, 5:01 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 30, 5:10 PM CDT	Severe Thunderstorm Warning	MEG	50 min
Jul 30, 6:29 PM CDT	Mesoscale Discussion	SPC	61 min
Aug 1, 7:33 AM CDT	Flash Flood Watch	MEG	14 hr
Aug 11, 6:46 PM CDT	Areal Flood Advisory	MEG	89 min
Sep 3, 6:02 AM CDT	Dense Fog Advisory	MEG	3 hr
Sep 6, 6:31 PM CDT	Flash Flood Warning	MEG	119 min
Sep 10, 3:11 PM CDT	Areal Flood Advisory	MEG	2 hr
Sep 15, 4:15 AM CDT	Flash Flood Watch	MEG	4 days
Sep 16, 10:13 PM CDT	Areal Flood Advisory	MEG	2 hr
Sep 17, 2:37 PM CDT	Flash Flood Warning	MEG	3 hr
Sep 18, 11:55 AM CDT	Flash Flood Warning	MEG	3 hr
Sep 18, 1:52 PM CDT	Flash Flood Warning	MEG	3 hr
Sep 20, 11:14 AM CDT	Flash Flood Watch	MEG	8 hr
Sep 20, 2:39 PM CDT	Flash Flood Warning	MEG	4 hr
Sep 20, 4:11 PM CDT	Flash Flood Warning	MEG	2 hr
Sep 21, 1:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 21, 9:58 PM CDT	Flash Flood Watch	MEG	26 hr
Sep 22, 6:43 PM CDT	Flash Flood Warning	MEG	3 hr
Sep 24, 5:17 PM CDT	Flash Flood Warning	MEG	3 hr
Sep 26, 3:30 PM CDT	Dense Fog Advisory	MEG	16 hr
Oct 9, 11:26 AM CDT	Tornado Watch	SPC	5 hr
Oct 9, 1:47 PM CDT	Severe Thunderstorm Warning	MEG	43 min
Oct 9, 2:20 PM CDT	Severe Thunderstorm Warning	MEG	40 min
Oct 13, 10:28 AM CDT	Flash Flood Watch	MEG	15 hr
Oct 13, 8:29 PM CDT	Flash Flood Warning	MEG	3 hr
Oct 13, 9:10 PM CDT	River Flood Warning	MEG	14 hr
Oct 15, 3:30 AM CDT	Dense Fog Advisory	MEG	3 hr
Oct 18, 3:56 AM CDT	Frost Advisory	MEG	29 hr
Oct 28, 1:16 AM CDT	Dense Fog Advisory	MEG	5 hr
Oct 30, 10:22 AM CDT	Mesoscale Discussion	SPC	83 min
Oct 30, 12:22 PM CDT	Tornado Watch	SPC	8 hr
Oct 30, 2:11 PM CDT	Mesoscale Discussion	SPC	94 min
Nov 5, 3:26 PM CST	Frost Advisory	MEG	15 hr
Nov 30, 12:23 AM CST	Areal Flood Advisory	MEG	2 hr
Dec 8, 3:31 PM CST	Flash Flood Watch	MEG	8 hr
Dec 8, 5:12 PM CST	Mesoscale Discussion	SPC	63 min
Dec 8, 5:48 PM CST	Tornado Watch	SPC	6 hr
Dec 21, 9:05 PM CST	Freezing Fog Advisory	MEG	11 hr
Dec 23, 3:32 PM CST	High Wind Watch	MEG	24 hr
Dec 23, 3:32 PM CST	Wind Advisory	MEG	44 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	26
Severe Thunderstorm Watch	8
Tornado Watch	10
Mesoscale Discussion	39
Flooding
Areal Flood Warning	1
Flash Flood Warning	14
River Flood Warning	1
Flash Flood Watch	18
Areal Flood Advisory	9
Winter
Winter Storm Warning	1
Winter Weather Advisory	1
Heat
Excessive Heat Warning	1
Heat Advisory	5
Cold
Freeze Warning	1
Freeze Watch	1
Frost Advisory	3
Wind and dust
High Wind Watch	1
Wind Advisory	4
Fog and smoke
Dense Fog Advisory	9
Freezing Fog Advisory	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 2008 2010

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.