Weather alerts in Ohio, 2015
2,499 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 2,499
- Warnings
- 859
- Watches
- 135
- Advisories
- 528
- Busiest month
- June630 alerts
- Busiest day
- July 14, 2015131 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
4 of 26 tornado warnings covering Ohio in 2015 had a tornado report inside them; 2 of 6 tornado reports fell inside a warning, on average 11 minutes after it went out.
Ohio, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 26 | 4 | 85% | 6 | 33% | 11 min |
| Severe thunderstorm warnings | 391 | 268 | 31% | 759 | 73% | 19 min |
| Flash flood warnings | 65 | 41 | 37% | 101 | 88% | 122 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Cleveland, OH: tornado warnings | 9 | 0 | 100% | 0 | ||
| NWS Cleveland, OH: severe thunderstorm warnings | 112 | 77 | 31% | 158 | 78% | 16 min |
| NWS Cleveland, OH: flash flood warnings | 3 | 0 | 100% | 0 | ||
| NWS Wilmington, OH: tornado warnings | 18 | 6 | 67% | 13 | 77% | 9 min |
| NWS Wilmington, OH: severe thunderstorm warnings | 218 | 136 | 38% | 587 | 71% | 19 min |
| NWS Wilmington, OH: flash flood warnings | 30 | 12 | 60% | 34 | 79% | 59 min |
| NWS Northern Indiana: tornado warnings | 2 | 0 | 100% | 2 | 0% | |
| NWS Northern Indiana: severe thunderstorm warnings | 107 | 71 | 34% | 257 | 56% | 20 min |
| NWS Northern Indiana: flash flood warnings | 17 | 5 | 71% | 18 | 89% | 70 min |
| NWS Charleston, WV: tornado warnings | 5 | 1 | 80% | 4 | 25% | 4 min |
| NWS Charleston, WV: severe thunderstorm warnings | 124 | 89 | 28% | 313 | 84% | 28 min |
| NWS Charleston, WV: flash flood warnings | 70 | 55 | 21% | 214 | 89% | 98 min |
| NWS Pittsburgh, PA: tornado warnings | 13 | 1 | 92% | 2 | 50% | 5 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 174 | 133 | 24% | 505 | 84% | 19 min |
| NWS Pittsburgh, PA: flash flood warnings | 49 | 38 | 22% | 140 | 91% | 106 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
2,499 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Adams County188
- Brown County186
- Clermont County182
- Warren County175
- Clinton County168
- Franklin County167
- Scioto County165
- Gallia County165
- Highland County161
- Mercer County160
- Greene County160
- Darke County158
- Madison County158
- Butler County158
- Pickaway County158
- Pike County158
- Miami County157
- Hamilton County157
- Lawrence County157
- Shelby County156
- Clark County153
- Defiance County152
- Auglaize County151
- Ross County151
- Champaign County150
- Meigs County150
- Fayette County148
- Montgomery County147
- Fairfield County147
- Union County146
- Henry County145
- Licking County144
- Van Wert County143
- Delaware County140
- Logan County140
- Putnam County140
- Preble County140
- Washington County138
- Athens County137
- Jackson County136
48 more counties
- Paulding County135
- Hardin County133
- Allen County132
- Hocking County131
- Hancock County124
- Vinton County124
- Sandusky County122
- Fulton County122
- Williams County120
- Marion County119
- Wood County115
- Lorain County113
- Erie County109
- Wyandot County108
- Lake County107
- Guernsey County106
- Morgan County105
- Seneca County104
- Carroll County103
- Lucas County101
- Columbiana County101
- Crawford County100
- Cuyahoga County100
- Trumbull County100
- Perry County100
- Ottawa County99
- Jefferson County99
- Morrow County97
- Harrison County97
- Tuscarawas County96
- Muskingum County95
- Ashtabula County94
- Knox County94
- Coshocton County94
- Huron County93
- Belmont County93
- Portage County91
- Stark County90
- Summit County90
- Ashland County88
- Mahoning County88
- Richland County88
- Noble County88
- Geauga County87
- Wayne County86
- Medina County84
- Holmes County82
- Monroe County80
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20142016
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.