Weather alerts in Indiana, 2021
2,309 weather alerts in 2021, 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 2021. Tap one for its archive.
- Alerts
- 2,309
- Warnings
- 817
- Watches
- 108
- Advisories
- 530
- Busiest month
- June520 alerts
- Busiest day
- June 19, 2021100 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
6 of 34 tornado warnings covering Indiana in 2021 had a tornado report inside them; 6 of 22 tornado reports fell inside a warning, on average 6 minutes after it went out.
Indiana, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 34 | 6 | 82% | 22 | 27% | 6 min |
| Severe thunderstorm warnings | 290 | 174 | 40% | 532 | 68% | 19 min |
| Flash flood warnings | 56 | 33 | 41% | 68 | 81% | 74 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Louisville, KY: tornado warnings | 31 | 14 | 55% | 53 | 81% | 19 min |
| NWS Louisville, KY: severe thunderstorm warnings | 111 | 54 | 51% | 190 | 52% | 11 min |
| NWS Louisville, KY: flash flood warnings | 60 | 39 | 35% | 95 | 79% | 91 min |
| NWS Chicago, IL: tornado warnings | 41 | 12 | 71% | 25 | 56% | 16 min |
| NWS Chicago, IL: severe thunderstorm warnings | 116 | 75 | 35% | 398 | 87% | 31 min |
| NWS Chicago, IL: flash flood warnings | 11 | 7 | 36% | 27 | 96% | 106 min |
| NWS Paducah, KY: tornado warnings | 51 | 16 | 69% | 33 | 52% | 19 min |
| NWS Paducah, KY: severe thunderstorm warnings | 123 | 42 | 66% | 144 | 49% | 17 min |
| NWS Paducah, KY: flash flood warnings | 65 | 29 | 55% | 52 | 83% | 97 min |
| NWS Wilmington, OH: tornado warnings | 17 | 6 | 65% | 15 | 40% | 10 min |
| NWS Wilmington, OH: severe thunderstorm warnings | 126 | 85 | 33% | 276 | 64% | 19 min |
| NWS Wilmington, OH: flash flood warnings | 33 | 20 | 39% | 35 | 86% | 77 min |
| NWS Lincoln, IL: tornado warnings | 54 | 15 | 72% | 47 | 51% | 17 min |
| NWS Lincoln, IL: severe thunderstorm warnings | 130 | 49 | 62% | 213 | 54% | 22 min |
| NWS Lincoln, IL: flash flood warnings | 37 | 14 | 62% | 32 | 84% | 93 min |
| NWS Indianapolis, IN: tornado warnings | 11 | 2 | 82% | 4 | 50% | 8 min |
| NWS Indianapolis, IN: severe thunderstorm warnings | 105 | 65 | 38% | 207 | 73% | 17 min |
| NWS Indianapolis, IN: flash flood warnings | 27 | 14 | 48% | 23 | 78% | 102 min |
| NWS Northern Indiana: tornado warnings | 14 | 1 | 93% | 9 | 11% | 3 min |
| NWS Northern Indiana: severe thunderstorm warnings | 128 | 77 | 40% | 377 | 58% | 19 min |
| NWS Northern Indiana: flash flood warnings | 6 | 3 | 50% | 25 | 84% | 59 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
2,309 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.
- Lake County176
- Porter County150
- Elkhart County144
- Newton County138
- Marshall County131
- Jasper County129
- Starke County128
- Noble County125
- Knox County124
- LaGrange County123
- Steuben County114
- Gibson County113
- Ripley County112
- Fulton County111
- Dearborn County110
- Allen County109
- Pulaski County108
- Parke County107
- Saint Joseph County106
- DeKalb County105
- Kosciusko County104
- Marion County103
- Vermillion County103
- Whitley County102
- Cass County100
- Washington County99
- Wabash County99
- Miami County99
- Warren County98
- Wells County98
- Daviess County97
- Morgan County97
- Jefferson County96
- LaPorte County96
- Franklin County96
- Jackson County95
- Pike County94
- Lawrence County94
- Huntington County93
- Vigo County93
52 more counties
- Benton County92
- Greene County92
- Fountain County92
- Owen County92
- Monroe County91
- Switzerland County91
- Harrison County90
- Johnson County90
- Tippecanoe County90
- Vanderburgh County89
- Floyd County89
- Carroll County89
- Clark County88
- White County88
- Hamilton County88
- Posey County88
- Dubois County87
- Adams County87
- Shelby County87
- Ohio County85
- Sullivan County85
- Delaware County84
- Crawford County84
- Montgomery County84
- Rush County84
- Spencer County83
- Bartholomew County83
- Randolph County81
- Warrick County81
- Scott County81
- Orange County81
- Perry County80
- Fayette County80
- Brown County79
- Wayne County79
- Clinton County78
- Jay County77
- Madison County77
- Decatur County76
- Martin County76
- Boone County76
- Hendricks County76
- Howard County76
- Grant County75
- Jennings County74
- Clay County74
- Putnam County72
- Union County70
- Henry County69
- Blackford County68
- Tipton County68
- Hancock County66
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.