Weather alerts in Indiana, 2015
2,975 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
- 2,975
- Warnings
- 1,318
- Watches
- 175
- Advisories
- 571
- Busiest month
- June789 alerts
- Busiest day
- July 14, 2015127 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
7 of 38 tornado warnings covering Indiana in 2015 had a tornado report inside them; 12 of 24 tornado reports fell inside a warning, on average 8 minutes after it went out.
Indiana, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 38 | 7 | 82% | 24 | 50% | 8 min |
| Severe thunderstorm warnings | 419 | 224 | 47% | 578 | 63% | 19 min |
| Flash flood warnings | 142 | 59 | 58% | 124 | 87% | 82 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 36 | 22 | 39% | 69 | 83% | 15 min |
| NWS Chicago, IL: severe thunderstorm warnings | 147 | 73 | 50% | 252 | 71% | 20 min |
| NWS Chicago, IL: flash flood warnings | 46 | 20 | 57% | 44 | 84% | 87 min |
| NWS Indianapolis, IN: tornado warnings | 18 | 2 | 89% | 7 | 43% | 9 min |
| NWS Indianapolis, IN: severe thunderstorm warnings | 141 | 59 | 58% | 209 | 62% | 21 min |
| NWS Indianapolis, IN: flash flood warnings | 48 | 13 | 73% | 35 | 77% | 72 min |
| NWS Lincoln, IL: tornado warnings | 20 | 4 | 80% | 16 | 31% | 3 min |
| NWS Lincoln, IL: severe thunderstorm warnings | 150 | 72 | 52% | 307 | 67% | 22 min |
| NWS Lincoln, IL: flash flood warnings | 78 | 25 | 68% | 55 | 80% | 144 min |
| 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 Paducah, KY: tornado warnings | 30 | 7 | 77% | 27 | 37% | 7 min |
| NWS Paducah, KY: severe thunderstorm warnings | 172 | 79 | 54% | 194 | 70% | 18 min |
| NWS Paducah, KY: flash flood warnings | 54 | 20 | 63% | 47 | 60% | 63 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 Louisville, KY: tornado warnings | 32 | 4 | 88% | 15 | 40% | 16 min |
| NWS Louisville, KY: severe thunderstorm warnings | 384 | 225 | 41% | 592 | 73% | 16 min |
| NWS Louisville, KY: flash flood warnings | 100 | 59 | 41% | 174 | 77% | 79 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
2,975 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.
- Harrison County204
- Clark County202
- Washington County185
- Lake County183
- Allen County182
- Newton County181
- Crawford County180
- Floyd County178
- Tippecanoe County176
- Jasper County175
- Perry County175
- Marion County174
- Porter County173
- Knox County166
- Parke County166
- Montgomery County162
- Morgan County159
- Jefferson County157
- Huntington County155
- White County153
- Wells County152
- Putnam County152
- Carroll County151
- Hamilton County151
- Scott County150
- Starke County149
- Johnson County149
- Vermillion County148
- Dubois County148
- Fountain County147
- Adams County147
- Gibson County147
- Marshall County146
- Pulaski County146
- Wabash County146
- Switzerland County146
- Boone County145
- Miami County145
- Posey County145
- Lawrence County144
52 more counties
- Hancock County144
- Elkhart County143
- Warren County141
- Hendricks County141
- Madison County140
- Ohio County140
- Wayne County139
- Orange County139
- Whitley County138
- Spencer County137
- Cass County136
- Daviess County136
- Fulton County135
- Dearborn County135
- Vanderburgh County135
- Benton County134
- Clinton County133
- Warrick County133
- Shelby County132
- Noble County130
- Owen County130
- Randolph County129
- Ripley County129
- Delaware County128
- LaGrange County128
- Henry County127
- DeKalb County127
- Jackson County127
- Bartholomew County127
- Jay County126
- Monroe County126
- Pike County125
- Martin County124
- Franklin County123
- Greene County123
- Blackford County121
- Grant County118
- Steuben County118
- Clay County117
- Tipton County114
- Vigo County114
- Union County113
- Brown County111
- Howard County109
- Rush County108
- Fayette County107
- Jennings County107
- Sullivan County105
- Kosciusko County105
- Decatur County95
- LaPorte County75
- Saint Joseph County70
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.