Weather alerts in DeKalb County, Alabama, 2009

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

DeKalb County and its neighbors

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

Alerts: 185
Warnings: 81
Watches: 42
Advisories: 21
Busiest month: April35 alerts
Busiest day: April 10, 200915 alerts

Over time

By month

Warning verification

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

5 of 15 tornado warnings covering DeKalb County in 2009 had a tornado report inside them; 6 of 7 tornado reports fell inside a warning, on average 17 minutes after it went out.

DeKalb County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	15	5	67%	7	86%	17 min
Severe thunderstorm warnings	23	10	57%	20	40%	16 min
Flash flood warnings	14	7	50%	9	67%	155 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Huntsville, AL: tornado warnings	79	21	73%	47	70%	12 min
NWS Huntsville, AL: severe thunderstorm warnings	246	99	60%	469	63%	20 min
NWS Huntsville, AL: flash flood warnings	98	46	53%	199	79%	95 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 5, 4:11 AM CST	Flood Watch	HUN	44 hr
Jan 6, 8:22 AM CST	Areal Flood Warning	HUN	3 hr
Jan 6, 10:43 AM CST	Flash Flood Warning	HUN	6 hr
Jan 6, 1:51 PM CST	Severe Thunderstorm Warning	HUN	24 min
Jan 6, 1:53 PM CST	Tornado Warning	HUN	37 min
Jan 6, 2:03 PM CST	Tornado Watch	SPC	5 hr
Jan 6, 3:13 PM CST	Flash Flood Warning	HUN	6 hr
Jan 6, 3:20 PM CST	Tornado Warning	HUN	25 min
Jan 6, 4:26 PM CST	Flash Flood Warning	HUN	7 hr
Jan 6, 11:30 PM CST	Areal Flood Warning	HUN	12 hr
Jan 7, 1:09 PM CST	Wind Advisory	HUN	4 hr
Jan 15, 4:05 AM CST	Wind Chill Advisory	HUN	29 hr
Jan 15, 7:07 AM CST	Fire Weather Watch	HUN	7 hr
Jan 15, 2:27 PM CST	Red Flag Warning	HUN	13 hr
Jan 16, 9:27 AM CST	Red Flag Warning	HUN	9 hr
Jan 17, 4:10 PM CST	Freezing Rain Advisory	HUN	7 hr
Feb 3, 11:14 AM CST	Wind Advisory	HUN	7 hr
Feb 3, 9:56 PM CST	Wind Chill Advisory	HUN	6 hr
Feb 4, 1:38 PM CST	Fire Weather Watch	HUN	14 hr
Feb 5, 3:58 AM CST	Red Flag Warning	HUN	13 hr
Feb 10, 3:10 PM CST	Wind Advisory	HUN	12 hr
Feb 11, 3:06 AM CST	High Wind Warning	HUN	15 hr
Feb 11, 10:02 AM CST	Mesoscale Discussion	SPC	88 min
Feb 11, 11:10 AM CST	Tornado Watch	SPC	6 hr
Feb 11, 1:29 PM CST	Mesoscale Discussion	SPC	2 hr
Feb 11, 2:00 PM CST	Severe Thunderstorm Warning	HUN	30 min
Feb 11, 2:16 PM CST	Severe Thunderstorm Warning	HUN	29 min
Feb 18, 12:42 PM CST	Tornado Watch	SPC	7 hr
Feb 18, 2:13 PM CST	Tornado Warning	HUN	32 min
Feb 18, 2:33 PM CST	Severe Thunderstorm Warning	HUN	27 min
Feb 18, 3:22 PM CST	Mesoscale Discussion	SPC	83 min
Feb 19, 4:07 PM CST	Fire Weather Watch	HUN	11 hr
Feb 20, 3:09 AM CST	Red Flag Warning	HUN	14 hr
Feb 21, 1:20 PM CST	Red Flag Warning	HUN	3 hr
Feb 27, 10:17 AM CST	Flash Flood Watch	HUN	20 hr
Feb 28, 2:16 PM CST	Winter Weather Advisory	HUN	3 hr
Feb 28, 5:29 PM CST	Winter Storm Warning	HUN	16 hr
Mar 1, 4:48 AM CST	Wind Advisory	HUN	13 hr
Mar 2, 12:29 PM CST	Fire Weather Watch	HUN	16 hr
Mar 3, 4:30 AM CST	Red Flag Warning	HUN	14 hr
Mar 3, 1:57 PM CST	Fire Weather Watch	HUN	15 hr
Mar 4, 4:33 AM CST	Red Flag Warning	HUN	13 hr
Mar 17, 1:38 AM CDT	Dense Fog Advisory	HUN	8 hr
Mar 20, 10:26 AM CDT	Red Flag Warning	HUN	8 hr
Mar 28, 2:23 PM CDT	Tornado Watch	SPC	7 hr
Mar 28, 5:18 PM CDT	Mesoscale Discussion	SPC	57 min
Mar 28, 7:21 PM CDT	Mesoscale Discussion	SPC	54 min
Mar 28, 7:54 PM CDT	Tornado Warning	HUN	36 min
Mar 28, 8:29 PM CDT	Tornado Warning	HUN	16 min
Mar 28, 9:42 PM CDT	Mesoscale Discussion	SPC	63 min
Apr 2, 1:09 PM CDT	Mesoscale Discussion	SPC	66 min
Apr 2, 5:25 PM CDT	Mesoscale Discussion	SPC	95 min
Apr 2, 6:02 PM CDT	Tornado Watch	SPC	7 hr
Apr 2, 7:05 PM CDT	Flood Watch	HUN	3 hr
Apr 2, 9:15 PM CDT	Mesoscale Discussion	SPC	90 min
Apr 2, 9:23 PM CDT	Severe Thunderstorm Warning	HUN	25 min
Apr 6, 4:14 AM CDT	Freeze Warning	HUN	27 hr
Apr 6, 4:14 AM CDT	Freeze Warning	HUN	50 hr
Apr 10, 4:25 AM CDT	Mesoscale Discussion	SPC	95 min
Apr 10, 6:04 AM CDT	Severe Thunderstorm Warning	HUN	27 min
Apr 10, 11:23 AM CDT	Tornado Watch PDS	SPC	8 hr
Apr 10, 1:06 PM CDT	Wind Advisory	HUN	6 hr
Apr 10, 3:12 PM CDT	Tornado Warning	HUN	33 min
Apr 10, 3:27 PM CDT	Flash Flood Warning	HUN	2 hr
Apr 10, 3:30 PM CDT	Severe Thunderstorm Warning	HUN	45 min
Apr 10, 3:32 PM CDT	Severe Thunderstorm Warning	HUN	43 min
Apr 10, 3:33 PM CDT	Severe Thunderstorm Warning	HUN	27 min
Apr 10, 3:33 PM CDT	Tornado Warning	HUN	27 min
Apr 10, 3:43 PM CDT	Mesoscale Discussion	SPC	92 min
Apr 10, 3:58 PM CDT	Severe Thunderstorm Warning	HUN	47 min
Apr 10, 4:04 PM CDT	Tornado Warning	HUN	26 min
Apr 10, 4:28 PM CDT	Severe Thunderstorm Warning	HUN	32 min
Apr 10, 4:40 PM CDT	Tornado Warning	HUN	16 min
Apr 13, 12:58 PM CDT	Tornado Watch	SPC	7 hr
Apr 13, 5:52 PM CDT	Mesoscale Discussion	SPC	53 min
Apr 19, 4:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 19, 7:27 PM CDT	Mesoscale Discussion	SPC	63 min
Apr 19, 8:16 PM CDT	Severe Thunderstorm Warning	HUN	29 min
Apr 19, 8:43 PM CDT	Tornado Warning	HUN	32 min
Apr 19, 8:55 PM CDT	Severe Thunderstorm Warning	HUN	35 min
Apr 19, 9:10 PM CDT	Tornado Warning	HUN	35 min
Apr 19, 9:19 PM CDT	Tornado Warning	HUN	26 min
Apr 21, 3:03 AM CDT	Wind Advisory	HUN	15 hr
Apr 21, 11:49 AM CDT	Red Flag Warning	HUN	6 hr
Apr 23, 2:03 PM CDT	Mesoscale Discussion	SPC	117 min
May 1, 1:18 PM CDT	Mesoscale Discussion	SPC	87 min
May 1, 2:23 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 1, 3:48 PM CDT	Mesoscale Discussion	SPC	87 min
May 1, 4:11 PM CDT	Flash Flood Watch	HUN	8 hr
May 1, 5:57 PM CDT	Severe Thunderstorm Warning	HUN	48 min
May 1, 6:15 PM CDT	Severe Thunderstorm Warning	HUN	45 min
May 1, 6:23 PM CDT	Flash Flood Warning	HUN	6 hr
May 1, 6:41 PM CDT	Mesoscale Discussion	SPC	64 min
May 2, 12:38 AM CDT	Flash Flood Watch	HUN	10 hr
May 2, 10:12 AM CDT	Flood Watch	HUN	39 hr
May 2, 10:40 AM CDT	Flash Flood Warning	HUN	2 hr
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 5, 4:03 PM CDT	Flash Flood Watch	HUN	27 hr
May 6, 4:03 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 6, 5:04 AM CDT	Flash Flood Warning	HUN	5 hr
May 6, 6:05 AM CDT	Flash Flood Warning	HUN	3 hr
May 6, 7:22 AM CDT	Mesoscale Discussion	SPC	83 min
May 6, 9:02 AM CDT	Flash Flood Warning	HUN	5 hr
May 6, 9:04 AM CDT	Mesoscale Discussion	SPC	56 min
May 6, 9:27 AM CDT	Tornado Watch	SPC	9 hr
May 6, 10:46 AM CDT	Tornado Warning	HUN	23 min
May 6, 11:12 AM CDT	Tornado Warning	HUN	13 min
May 9, 2:20 PM CDT	Flood Watch	HUN	23 hr
May 9, 5:31 PM CDT	Mesoscale Discussion	SPC	89 min
May 16, 10:21 AM CDT	Flash Flood Watch	HUN	10 hr
May 28, 12:28 PM CDT	Mesoscale Discussion	SPC	62 min
Jun 11, 9:41 AM CDT	Mesoscale Discussion	SPC	94 min
Jun 11, 4:30 PM CDT	Severe Thunderstorm Warning	HUN	30 min
Jun 11, 4:55 PM CDT	Severe Thunderstorm Warning	HUN	35 min
Jun 11, 5:28 PM CDT	Severe Thunderstorm Warning	HUN	47 min
Jun 12, 3:01 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 12, 5:24 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 12, 8:00 PM CDT	Mesoscale Discussion	SPC	90 min
Jun 14, 2:35 AM CDT	Dense Fog Advisory	HUN	6 hr
Jun 14, 8:50 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 14, 10:45 AM CDT	Mesoscale Discussion	SPC	90 min
Jun 15, 12:36 AM CDT	Dense Fog Advisory	HUN	7 hr
Jun 15, 4:57 PM CDT	Mesoscale Discussion	SPC	63 min
Jun 15, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 15, 7:50 PM CDT	Mesoscale Discussion	SPC	55 min
Jun 28, 11:39 AM CDT	Mesoscale Discussion	SPC	66 min
Jun 28, 12:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 28, 1:38 PM CDT	Severe Thunderstorm Warning	HUN	23 min
Jun 28, 2:24 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 28, 3:52 PM CDT	Mesoscale Discussion	SPC	53 min
Jun 28, 5:11 PM CDT	Severe Thunderstorm Warning	HUN	29 min
Jun 28, 6:27 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 3:42 AM CDT	Red Flag Warning	HUN	14 hr
Jul 5, 4:18 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 13, 12:45 AM CDT	Severe Thunderstorm Warning	HUN	30 min
Jul 13, 12:46 AM CDT	Flash Flood Warning	HUN	106 min
Jul 30, 3:48 AM CDT	Flash Flood Watch	HUN	32 hr
Jul 30, 5:38 PM CDT	Severe Thunderstorm Watch	SPC	3 hr
Aug 1, 6:08 PM CDT	Flash Flood Warning	HUN	2 hr
Aug 21, 4:58 PM CDT	Severe Thunderstorm Warning	HUN	20 min
Sep 9, 11:39 AM CDT	Mesoscale Discussion	SPC	96 min
Sep 9, 11:39 AM CDT	Mesoscale Discussion	SPC	96 min
Sep 10, 4:13 AM CDT	Dense Fog Advisory	HUN	5 hr
Sep 17, 3:50 AM CDT	Flash Flood Watch	HUN	6 days
Sep 21, 11:32 AM CDT	Areal Flood Warning	HUN	4 hr
Sep 21, 4:46 PM CDT	Flash Flood Warning	HUN	112 min
Sep 21, 4:59 PM CDT	Areal Flood Warning	HUN	6 hr
Sep 25, 3:50 AM CDT	Flash Flood Watch	HUN	35 hr
Sep 25, 6:43 AM CDT	Dense Fog Advisory	HUN	3 hr
Sep 26, 10:25 AM CDT	Mesoscale Discussion	SPC	2 hr
Sep 26, 11:23 AM CDT	Mesoscale Discussion	SPC	3 hr
Oct 9, 3:12 AM CDT	Flash Flood Watch	HUN	16 hr
Oct 9, 12:24 PM CDT	Tornado Watch	SPC	7 hr
Oct 9, 1:41 PM CDT	Mesoscale Discussion	SPC	94 min
Oct 9, 6:11 PM CDT	Tornado Warning	HUN	24 min
Oct 9, 6:12 PM CDT	Severe Thunderstorm Warning	HUN	26 min
Oct 11, 9:18 PM CDT	Flash Flood Watch	HUN	15 hr
Oct 12, 7:48 AM CDT	Flash Flood Warning	HUN	6 hr
Oct 13, 1:33 PM CDT	Flash Flood Watch	HUN	13 hr
Oct 18, 3:25 AM CDT	Freeze Warning	HUN	30 hr
Nov 6, 2:48 AM CST	Red Flag Warning	HUN	14 hr
Nov 7, 1:05 PM CST	Red Flag Warning	HUN	4 hr
Nov 9, 4:15 AM CST	Flash Flood Watch	HUN	38 hr
Nov 26, 9:50 PM CST	Freeze Warning	HUN	10 hr
Dec 1, 3:03 AM CST	Wind Advisory	HUN	32 hr
Dec 4, 1:43 PM CST	Winter Weather Advisory	HUN	19 hr
Dec 4, 11:18 PM CST	Mesoscale Discussion	SPC	6 hr
Dec 8, 4:55 AM CST	Wind Advisory	HUN	37 hr
Dec 8, 10:24 PM CST	Mesoscale Discussion	SPC	96 min
Dec 8, 11:09 PM CST	Tornado Watch	SPC	5 hr
Dec 9, 12:28 AM CST	Flash Flood Warning	HUN	2 hr
Dec 9, 1:56 AM CST	Areal Flood Warning	HUN	3 hr
Dec 9, 2:54 AM CST	Areal Flood Warning	HUN	3 hr
Dec 9, 6:26 AM CST	Areal Flood Warning	HUN	6 hr
Dec 9, 12:16 PM CST	Areal Flood Warning	HUN	8 hr
Dec 10, 3:14 PM CST	Fire Weather Watch	HUN	13 hr
Dec 11, 4:24 AM CST	Red Flag Warning	HUN	13 hr
Dec 13, 2:47 PM CST	Dense Fog Advisory	HUN	15 hr
Dec 18, 10:19 AM CST	Areal Flood Warning	HUN	3 hr
Dec 23, 3:35 AM CST	Wind Advisory	HUN	30 hr
Dec 23, 3:36 AM CST	Flash Flood Watch	HUN	41 hr
Dec 24, 9:54 AM CST	High Wind Warning	HUN	11 hr
Dec 24, 8:33 PM CST	Wind Advisory	HUN	12 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	23
Tornado Warning	15
Severe Thunderstorm Watch	8
Tornado Watch	11
Mesoscale Discussion	41
Flooding
Areal Flood Warning	9
Flash Flood Warning	14
Flash Flood Watch	13
Flood Watch	4
Winter
Winter Storm Warning	1
Freezing Rain Advisory	1
Winter Weather Advisory	2
Cold
Freeze Warning	4
Wind Chill Advisory	2
Wind and dust
High Wind Warning	2
Wind Advisory	10
Fire
Red Flag Warning	13
Fire Weather Watch	6
Fog and smoke
Dense Fog Advisory	6

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.