Weather alerts in Florida, 2019
6,502 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 6,502
- Warnings
- 2,310
- Watches
- 87
- Advisories
- 1,083
- Busiest month
- June1,038 alerts
- Busiest day
- April 19, 2019163 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
18 of 81 tornado warnings covering Florida in 2019 had a tornado report inside them; 20 of 26 tornado reports fell inside a warning, on average 13 minutes after it went out.
Florida, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 81 | 18 | 78% | 26 | 77% | 13 min |
| Severe thunderstorm warnings | 413 | 216 | 48% | 525 | 70% | 22 min |
| Flash flood warnings | 24 | 11 | 54% | 22 | 95% | 60 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Miami, FL: tornado warnings | 9 | 3 | 67% | 3 | 100% | 2 min |
| NWS Miami, FL: severe thunderstorm warnings | 49 | 15 | 69% | 35 | 54% | 18 min |
| NWS Miami, FL: flash flood warnings | 9 | 3 | 67% | 9 | 100% | 78 min |
| NWS Mobile, AL: tornado warnings | 57 | 6 | 89% | 16 | 88% | 13 min |
| NWS Mobile, AL: severe thunderstorm warnings | 174 | 51 | 71% | 112 | 79% | 22 min |
| NWS Mobile, AL: flash flood warnings | 27 | 14 | 48% | 50 | 96% | 111 min |
| NWS Tallahassee, FL: tornado warnings | 74 | 20 | 73% | 32 | 78% | 11 min |
| NWS Tallahassee, FL: severe thunderstorm warnings | 232 | 170 | 27% | 351 | 87% | 25 min |
| NWS Tallahassee, FL: flash flood warnings | 16 | 12 | 25% | 18 | 94% | 66 min |
| NWS Tampa Bay, FL: tornado warnings | 13 | 3 | 77% | 6 | 83% | 21 min |
| NWS Tampa Bay, FL: severe thunderstorm warnings | 48 | 22 | 54% | 70 | 60% | 19 min |
| NWS Jacksonville, FL: tornado warnings | 24 | 5 | 79% | 8 | 100% | 14 min |
| NWS Jacksonville, FL: severe thunderstorm warnings | 142 | 73 | 49% | 233 | 67% | 24 min |
| NWS Jacksonville, FL: flash flood warnings | 2 | 1 | 50% | 5 | 100% | 29 min |
| NWS Melbourne, FL: tornado warnings | 8 | 0 | 100% | 2 | 0% | |
| NWS Melbourne, FL: severe thunderstorm warnings | 76 | 29 | 62% | 87 | 72% | 18 min |
| NWS Key West, FL: tornado warnings | 1 | 0 | 100% | 1 | 0% |
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
6,502 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.
- Palm Beach County378
- Broward County300
- Miami-Dade County293
- Duval County256
- Okaloosa County238
- Nassau County236
- Walton County235
- Volusia County225
- Escambia County224
- Bay County220
- Santa Rosa County215
- Gulf County201
- Flagler County199
- Franklin County169
- Collier County163
- Orange County154
- Hillsborough County151
- Marion County150
- Leon County147
- Jackson County137
- Holmes County136
- Gadsden County135
- Pinellas County134
- Wakulla County133
- Washington County132
- Seminole County129
- Monroe County128
- Hendry County127
- Calhoun County125
- Lake County124
- Saint Johns County120
- Brevard County117
- Manatee County115
- Jefferson County112
- Baker County111
- Alachua County109
- Martin County108
- Sarasota County107
- Clay County107
- Liberty County104
27 more counties
- Suwannee County100
- Putnam County99
- Osceola County98
- Charlotte County96
- Polk County95
- Taylor County95
- Lee County94
- Gilchrist County91
- Madison County91
- Dixie County90
- Pasco County90
- Lafayette County85
- Levy County84
- Bradford County83
- Union County83
- Columbia County83
- Citrus County82
- Glades County79
- Hernando County79
- Indian River County72
- Sumter County69
- Saint Lucie County68
- Hamilton County60
- Okeechobee County58
- Highlands County55
- Hardee County54
- DeSoto County53
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20182020
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.