Alert archive / Maryland / Howard County
Weather alerts in Howard County, Maryland, 2020
170 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Howard County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 170
- Warnings
- 61
- Watches
- 35
- Advisories
- 33
- Busiest month
- August30 alerts
- Busiest day
- September 3, 202010 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 5 tornado warnings covering Howard County in 2020 had a tornado report inside them.
Howard County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 35 | 28 | 20% | 58 | 71% | 24 min |
| Flash flood warnings | 3 | 1 | 67% | 1 | 100% | 68 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 27 | 6 | 78% | 15 | 47% | 9 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 456 | 314 | 31% | 1,047 | 79% | 23 min |
| NWS Baltimore/Washington: flash flood warnings | 66 | 34 | 48% | 130 | 90% | 72 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, 4:14 AM EST | Dense Fog Advisory | LWX | 7 hr |
| Jan 6, 1:49 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Jan 7, 12:29 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 8, 3:40 AM EST | Wind Advisory | LWX | 13 hr |
| Jan 14, 10:41 PM EST | Dense Fog Advisory | LWX | 10 hr |
| Jan 17, 1:33 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Feb 5, 3:23 PM EST | Flood Watch | LWX | 35 hr |
| Feb 6, 9:30 PM EST | Wind Advisory | LWX | 20 hr |
| Feb 7, 4:08 AM EST | Dense Fog Advisory | LWX | 3 hr |
| Feb 7, 7:37 AM EST | Tornado Warning | LWX | 23 min |
| Feb 7, 7:56 AM EST | Severe Thunderstorm Warning | LWX | 34 min |
| Feb 26, 12:54 AM EST | Dense Fog Advisory | LWX | 8 hr |
| Mar 3, 6:50 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 3, 10:52 PM EST | Mesoscale Discussion | SPC | 113 min |
| Mar 3, 11:49 PM EST | Severe Thunderstorm Warning | LWX | 41 min |
| Mar 20, 2:18 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Mar 29, 11:16 PM EDT | Dense Fog Advisory | LWX | 5 hr |
| Apr 8, 3:53 AM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Apr 8, 3:53 AM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 8, 8:13 PM EDT | Wind Advisory | LWX | 23 hr |
| Apr 9, 11:51 AM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Apr 9, 12:01 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 9, 7:38 PM EDT | Wind Advisory | LWX | 22 hr |
| Apr 9, 7:47 PM EDT | Freeze Watch | LWX | 19 hr |
| Apr 10, 2:28 PM EDT | Freeze Warning | LWX | 19 hr |
| Apr 12, 12:35 PM EDT | Wind Advisory | LWX | 29 hr |
| Apr 13, 10:34 AM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 13, 11:09 AM EDT | Areal Flood Warning | LWX | 12 hr |
| Apr 13, 11:33 AM EDT | Tornado Watch | SPC | 5 hr |
| Apr 13, 12:07 PM EDT | Tornado Warning | LWX | 23 min |
| Apr 13, 1:20 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Apr 13, 1:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 13, 2:01 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| Apr 13, 2:18 PM EDT | Severe Thunderstorm Warning | LWX | 27 min |
| Apr 13, 2:24 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Apr 15, 1:09 PM EDT | Freeze Watch | LWX | 24 hr |
| Apr 16, 1:19 PM EDT | Freeze Warning | LWX | 20 hr |
| Apr 18, 1:19 PM EDT | Frost Advisory | LWX | 20 hr |
| Apr 21, 4:04 AM EDT | Freeze Warning | LWX | 27 hr |
| Apr 21, 12:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 29, 4:24 AM EDT | Flood Watch | LWX | 39 hr |
| May 7, 2:16 PM EDT | Freeze Watch | LWX | 24 hr |
| May 7, 2:16 PM EDT | Freeze Warning | LWX | 43 hr |
| May 8, 3:30 AM EDT | Freeze Watch | LWX | 24 hr |
| May 9, 3:36 AM EDT | Freeze Warning | LWX | 28 hr |
| May 11, 3:43 AM EDT | Frost Advisory | LWX | 26 hr |
| May 12, 2:41 PM EDT | Frost Advisory | LWX | 18 hr |
| May 29, 12:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 29, 2:25 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 29, 3:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 3, 3:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 2:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 4, 4:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 4, 7:52 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Jun 5, 3:40 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jun 5, 4:28 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Jun 10, 7:45 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Jun 10, 10:06 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Jun 20, 10:45 AM EDT | Flash Flood Watch | LWX | 10 hr |
| Jun 22, 1:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 22, 4:12 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jun 22, 4:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jun 22, 5:00 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jun 22, 5:23 PM EDT | Flash Flood Watch | LWX | 116 min |
| Jun 22, 5:30 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jun 22, 5:45 PM EDT | Flash Flood Warning | LWX | 96 min |
| Jun 23, 6:50 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Jun 25, 1:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 25, 6:08 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Jun 25, 6:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 25, 6:20 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Jun 25, 6:53 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Jun 28, 4:21 PM EDT | Severe Thunderstorm Warning | LWX | 17 min |
| Jul 5, 1:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 6, 12:33 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 6, 12:41 PM EDT | Flash Flood Watch | LWX | 15 hr |
| Jul 6, 1:38 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 6, 4:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 6, 6:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 8:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 2:59 PM EDT | Heat Advisory | LWX | 29 hr |
| Jul 19, 2:47 PM EDT | Excessive Heat Watch | LWX | 5 hr |
| Jul 19, 2:47 PM EDT | Heat Advisory | LWX | 29 hr |
| Jul 21, 2:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 21, 7:59 PM EDT | Severe Thunderstorm Warning | LWX | 27 min |
| Jul 22, 12:07 AM EDT | Heat Advisory | LWX | 18 hr |
| Jul 22, 10:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 22, 12:01 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 22, 1:36 PM EDT | Flash Flood Watch | LWX | 4 hr |
| Jul 22, 3:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 22, 3:55 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Jul 22, 4:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 24, 6:01 PM EDT | Flash Flood Watch | LWX | 3 hr |
| Jul 28, 3:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 30, 8:27 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Jul 30, 10:01 PM EDT | Flash Flood Watch | LWX | 20 hr |
| Aug 1, 4:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 7:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 2, 3:28 PM EDT | Flash Flood Watch | LWX | 45 hr |
| Aug 3, 5:29 AM EDT | Tropical Storm Warning | LWX | 36 hr |
| Aug 4, 1:41 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 4, 9:53 AM EDT | Areal Flood Warning | LWX | 6 hr |
| Aug 5, 10:51 PM EDT | Flash Flood Watch | LWX | 25 hr |
| Aug 7, 3:46 AM EDT | Flash Flood Watch | LWX | 21 hr |
| Aug 7, 1:30 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 11, 3:19 PM EDT | Flash Flood Watch | LWX | 52 hr |
| Aug 12, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 1:30 PM EDT | Areal Flood Warning | LWX | 57 min |
| Aug 12, 5:05 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Aug 12, 5:23 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Aug 12, 5:35 PM EDT | Areal Flood Warning | LWX | 7 hr |
| Aug 12, 5:42 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 12, 5:49 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 23, 3:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 23, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 24, 12:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 2:51 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Aug 25, 3:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 25, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 25, 7:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 27, 6:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 28, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 28, 3:07 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Aug 28, 4:33 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Aug 28, 4:59 PM EDT | Flash Flood Watch | LWX | 11 hr |
| Aug 29, 12:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 2, 3:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Sep 2, 6:43 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 2, 7:06 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Sep 2, 7:36 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Sep 2, 7:38 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Sep 2, 8:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Sep 3, 3:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 3, 3:41 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Sep 3, 3:42 PM EDT | Tornado Watch | SPC | 6 hr |
| Sep 3, 3:43 PM EDT | Tornado Warning | LWX | 19 min |
| Sep 3, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| Sep 3, 4:36 PM EDT | Severe Thunderstorm Warning | LWX | 54 min |
| Sep 3, 4:36 PM EDT | Tornado Warning | LWX | 24 min |
| Sep 3, 4:43 PM EDT | Tornado Warning | LWX | 32 min |
| Sep 3, 5:33 PM EDT | Areal Flood Warning | LWX | 3 hr |
| Sep 9, 2:15 PM EDT | Flash Flood Watch | LWX | 30 hr |
| Sep 21, 1:31 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 17, 2:25 PM EDT | Frost Advisory | LWX | 20 hr |
| Oct 21, 1:51 AM EDT | Dense Fog Advisory | LWX | 9 hr |
| Oct 22, 1:01 AM EDT | Dense Fog Advisory | LWX | 9 hr |
| Oct 22, 10:21 AM EDT | Dense Fog Advisory | LWX | 99 min |
| Oct 23, 3:26 AM EDT | Dense Fog Advisory | LWX | 8 hr |
| Oct 28, 3:05 PM EDT | Flood Watch | LWX | 25 hr |
| Oct 29, 3:24 AM EDT | Freeze Watch | LWX | 13 hr |
| Oct 29, 11:30 AM EDT | Areal Flood Warning | LWX | 6 hr |
| Oct 29, 4:14 PM EDT | Freeze Warning | LWX | 41 hr |
| Oct 29, 8:44 PM EDT | Frost Advisory | LWX | 36 hr |
| Oct 31, 6:59 PM EDT | Wind Advisory | LWX | 44 hr |
| Nov 1, 8:45 PM EST | Wind Advisory | LWX | 3 hr |
| Nov 3, 8:41 PM EST | Frost Advisory | LWX | 12 hr |
| Nov 9, 4:44 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Nov 15, 3:33 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Nov 15, 5:35 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Nov 15, 6:28 PM EST | Severe Thunderstorm Warning | LWX | 92 min |
| Nov 15, 6:52 PM EST | Mesoscale Discussion | SPC | 113 min |
| Dec 12, 7:09 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Dec 14, 4:43 AM EST | Winter Storm Watch | LWX | 35 hr |
| Dec 15, 4:09 AM EST | Winter Storm Warning | LWX | 46 hr |
| Dec 15, 4:00 PM EST | Winter Weather Advisory | LWX | 33 hr |
| Dec 21, 4:21 AM EST | Dense Fog Advisory | LWX | 8 hr |
| Dec 23, 4:27 AM EST | Flash Flood Watch | LWX | 47 hr |
| Dec 25, 2:17 AM EST | Areal Flood Warning | LWX | 8 hr |
| Dec 25, 2:18 AM EST | Areal Flood Warning | LWX | 6 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 | 35 |
| Tornado Warning | 5 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 41 |
| Flooding | |
| Areal Flood Warning | 10 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 14 |
| Flood Watch | 3 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 3 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 5 |
| Frost Advisory | 7 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 13 |
| Tropical | |
| Tropical Storm Warning | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.