Alert archive / Michigan / Roscommon County
Weather alerts in Roscommon County, Michigan, 2009
68 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Roscommon County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 68
- Warnings
- 12
- Watches
- 14
- Advisories
- 30
- Busiest month
- February12 alerts
- Busiest day
- April 25, 20093 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Roscommon County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 1 | 0% | |||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gaylord, MI: tornado warnings | 1 | 0 | 100% | 0 | ||
| NWS Gaylord, MI: severe thunderstorm warnings | 18 | 6 | 67% | 17 | 59% | 16 min |
| NWS Gaylord, MI: flash flood warnings | 2 | 0 | 100% | 0 | ||
| NWS Marquette, MI: tornado warnings | 1 | 0 | 100% | 0 | ||
| NWS Marquette, MI: severe thunderstorm warnings | 14 | 3 | 79% | 9 | 44% | 13 min |
| NWS Northern Indiana: tornado warnings | 12 | 3 | 75% | 7 | 100% | 22 min |
| NWS Northern Indiana: severe thunderstorm warnings | 59 | 25 | 58% | 90 | 77% | 26 min |
| NWS Northern Indiana: flash flood warnings | 15 | 3 | 80% | 7 | 86% | 100 min |
| NWS Grand Rapids, MI: tornado warnings | 2 | 0 | 100% | 3 | 0% | |
| NWS Grand Rapids, MI: severe thunderstorm warnings | 40 | 22 | 45% | 85 | 62% | 24 min |
| NWS Grand Rapids, MI: flash flood warnings | 3 | 3 | 0% | 25 | 88% | 109 min |
| NWS Detroit, MI: tornado warnings | 5 | 0 | 100% | 0 | ||
| NWS Detroit, MI: severe thunderstorm warnings | 49 | 28 | 43% | 96 | 82% | 30 min |
| NWS Detroit, MI: flash flood warnings | 6 | 5 | 17% | 11 | 64% | 85 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, 4:13 PM EST | Freezing Rain Advisory | APX | 19 hr |
| Jan 4, 1:08 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 4, 6:56 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 11, 4:24 PM EST | Winter Storm Watch | APX | 23 hr |
| Jan 12, 3:38 PM EST | Winter Weather Advisory | APX | 25 hr |
| Jan 14, 4:10 PM EST | Wind Chill Advisory | APX | 19 hr |
| Jan 15, 10:43 PM EST | Wind Chill Advisory | APX | 13 hr |
| Jan 16, 4:24 PM EST | Winter Storm Watch | APX | 11 hr |
| Jan 17, 3:41 AM EST | Winter Storm Warning | APX | 24 hr |
| Jan 17, 6:35 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 4, 3:36 AM EST | Wind Chill Advisory | APX | 7 hr |
| Feb 11, 4:21 AM EST | Flood Watch | APX | 35 hr |
| Feb 11, 10:06 AM EST | Dense Fog Advisory | APX | 6 hr |
| Feb 16, 3:58 PM EST | Winter Storm Watch | APX | 43 hr |
| Feb 17, 4:17 PM EST | Winter Weather Advisory | APX | 36 hr |
| Feb 19, 4:39 AM EST | Winter Weather Advisory | APX | 18 hr |
| Feb 20, 4:12 PM EST | Winter Storm Warning | APX | 60 hr |
| Feb 21, 6:35 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 25, 4:16 AM EST | Winter Storm Watch | APX | 24 hr |
| Feb 25, 4:16 AM EST | Winter Weather Advisory | APX | 12 hr |
| Feb 26, 4:17 AM EST | Winter Weather Advisory | APX | 25 hr |
| Feb 26, 7:31 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Mar 8, 4:42 AM EDT | Winter Weather Advisory | APX | 24 hr |
| Mar 8, 7:42 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 10, 4:37 AM EDT | High Wind Watch | APX | 11 hr |
| Mar 10, 4:03 PM EDT | High Wind Warning | APX | 19 hr |
| Mar 11, 11:29 AM EDT | Wind Advisory | APX | 4 hr |
| Mar 28, 4:01 PM EDT | Winter Weather Advisory | APX | 20 hr |
| Apr 25, 10:23 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 25, 10:44 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 25, 11:55 AM EDT | Mesoscale Discussion | SPC | 95 min |
| May 10, 3:35 AM EDT | Freeze Warning | APX | 28 hr |
| May 11, 12:46 PM EDT | Freeze Warning | APX | 19 hr |
| May 16, 4:25 PM EDT | Freeze Warning | APX | 16 hr |
| May 17, 4:04 PM EDT | Freeze Warning | APX | 16 hr |
| May 18, 3:57 PM EDT | Fire Weather Watch | APX | 24 hr |
| May 19, 4:02 PM EDT | Red Flag Warning | APX | 28 hr |
| May 20, 4:09 PM EDT | Fire Weather Watch | APX | 19 hr |
| May 21, 10:48 AM EDT | Red Flag Warning | APX | 8 hr |
| May 24, 4:12 PM EDT | Frost Advisory | APX | 15 hr |
| May 30, 3:46 AM EDT | Freeze Watch | APX | 12 hr |
| May 30, 12:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 30, 4:10 PM EDT | Frost Advisory | APX | 16 hr |
| Jun 3, 2:50 PM EDT | Freeze Warning | APX | 16 hr |
| Jun 3, 4:18 PM EDT | Fire Weather Watch | APX | 37 hr |
| Jun 5, 5:25 AM EDT | Red Flag Warning | APX | 13 hr |
| Jun 18, 4:18 AM EDT | Dense Fog Advisory | APX | 5 hr |
| Aug 9, 3:13 PM EDT | Mesoscale Discussion | SPC | 32 min |
| Aug 9, 3:40 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 30, 3:48 AM EDT | Frost Advisory | APX | 28 hr |
| Aug 31, 3:35 PM EDT | Frost Advisory | APX | 16 hr |
| Sep 17, 1:53 AM EDT | Frost Advisory | APX | 7 hr |
| Sep 18, 3:44 PM EDT | Frost Advisory | APX | 17 hr |
| Sep 19, 3:55 PM EDT | Frost Advisory | APX | 16 hr |
| Sep 27, 2:40 PM EDT | Wind Advisory | APX | 25 hr |
| Nov 8, 3:16 AM EST | Dense Fog Advisory | APX | 3 hr |
| Nov 21, 9:06 PM EST | Dense Fog Advisory | APX | 13 hr |
| Dec 7, 4:13 AM EST | Winter Storm Watch | APX | 12 hr |
| Dec 7, 4:21 PM EST | Winter Storm Warning | APX | 4 days |
| Dec 9, 12:09 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 12, 11:26 PM EST | Flood Watch | APX | 17 hr |
| Dec 13, 4:21 AM EST | Winter Weather Advisory | APX | 6 hr |
| Dec 14, 9:14 AM EST | Winter Weather Advisory | APX | 7 hr |
| Dec 24, 10:15 AM EST | Winter Weather Advisory | APX | 16 hr |
| Dec 24, 7:28 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 25, 4:22 AM EST | Winter Weather Advisory | APX | 9 hr |
| Dec 26, 2:19 AM EST | Winter Weather Advisory | APX | 7 hr |
| Dec 27, 3:44 PM EST | Winter Weather Advisory | APX | 36 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 Watch | 2 |
| Mesoscale Discussion | 12 |
| Flooding | |
| Flood Watch | 2 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 5 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 13 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 1 |
| Frost Advisory | 7 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.