Weather alerts in Missouri, 2012
2,326 weather alerts in 2012, 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 2012. Tap one for its archive.
- Alerts
- 2,326
- Warnings
- 1,156
- Watches
- 117
- Advisories
- 296
- Busiest month
- March367 alerts
- Busiest day
- February 29, 201289 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
20 of 86 tornado warnings covering Missouri in 2012 had a tornado report inside them; 28 of 41 tornado reports fell inside a warning, on average 18 minutes after it went out.
Missouri, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 86 | 20 | 77% | 41 | 68% | 18 min |
| Severe thunderstorm warnings | 800 | 404 | 50% | 971 | 78% | 20 min |
| Flash flood warnings | 66 | 35 | 47% | 61 | 90% | 146 min |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 27 | 6 | 78% | 20 | 55% | 11 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 346 | 163 | 53% | 601 | 81% | 22 min |
| NWS St. Louis, MO: flash flood warnings | 28 | 9 | 68% | 17 | 88% | 144 min |
| NWS Memphis, TN: tornado warnings | 76 | 11 | 86% | 22 | 68% | 14 min |
| NWS Memphis, TN: severe thunderstorm warnings | 482 | 201 | 58% | 468 | 72% | 22 min |
| NWS Memphis, TN: flash flood warnings | 64 | 16 | 75% | 39 | 82% | 48 min |
| NWS Paducah, KY: tornado warnings | 84 | 21 | 75% | 41 | 61% | 14 min |
| NWS Paducah, KY: severe thunderstorm warnings | 450 | 165 | 63% | 478 | 65% | 18 min |
| NWS Paducah, KY: flash flood warnings | 16 | 7 | 56% | 17 | 94% | 117 min |
| NWS Springfield, MO: tornado warnings | 28 | 9 | 68% | 21 | 81% | 21 min |
| NWS Springfield, MO: severe thunderstorm warnings | 328 | 198 | 40% | 465 | 78% | 21 min |
| NWS Springfield, MO: flash flood warnings | 31 | 19 | 39% | 36 | 92% | 172 min |
| NWS Omaha, NE: tornado warnings | 19 | 5 | 74% | 19 | 21% | 19 min |
| NWS Omaha, NE: severe thunderstorm warnings | 225 | 124 | 45% | 230 | 81% | 16 min |
| NWS Omaha, NE: flash flood warnings | 14 | 7 | 50% | 14 | 79% | 36 min |
| NWS Quad Cities, IA: tornado warnings | 4 | 1 | 75% | 4 | 75% | 23 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 87 | 64 | 26% | 265 | 74% | 30 min |
| NWS Quad Cities, IA: flash flood warnings | 11 | 4 | 64% | 10 | 80% | 85 min |
| NWS Kansas City, MO: tornado warnings | 3 | 2 | 33% | 4 | 75% | 4 min |
| NWS Kansas City, MO: severe thunderstorm warnings | 111 | 50 | 55% | 137 | 66% | 15 min |
| NWS Kansas City, MO: flash flood warnings | 8 | 6 | 25% | 8 | 88% | 41 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
2,326 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.
- Dunklin County162
- Pemiscot County156
- Scott County151
- Stoddard County145
- Jasper County144
- Vernon County144
- Barton County141
- Cape Girardeau County140
- Bollinger County137
- Mississippi County136
- Greene County134
- New Madrid County131
- Dade County130
- Saint Louis County130
- Lawrence County129
- Newton County129
- Jefferson County129
- Barry County128
- Cedar County128
- Saint Charles County127
- Butler County126
- Christian County126
- Stone County126
- Phelps County125
- Wayne County124
- Washington County123
- Perry County121
- McDonald County121
- Maries County119
- Webster County119
- Texas County118
- Miller County117
- St. Clair County117
- Franklin County115
- Camden County114
- Dallas County113
- Douglas County113
- Wright County113
- Howell County111
- Taney County111
75 more counties
- Polk County110
- Ripley County109
- Ozark County107
- Pulaski County107
- Crawford County107
- Laclede County106
- Shannon County106
- City of Saint Louis105
- Saint Francois County103
- Carter County102
- Nodaway County101
- Buchanan County101
- Warren County101
- Dent County100
- Gasconade County98
- Sainte Genevieve County97
- Cass County96
- Hickory County96
- Osage County96
- Lincoln County95
- Atchison County94
- Oregon County93
- Bates County92
- Platte County92
- Clark County91
- Andrew County91
- Holt County91
- Madison County91
- DeKalb County89
- Daviess County88
- Jackson County88
- Iron County88
- Morgan County87
- Reynolds County87
- Henry County84
- Gentry County83
- Harrison County83
- Clay County82
- Benton County82
- Worth County81
- Pettis County81
- Cole County81
- Cooper County80
- Callaway County80
- Montgomery County80
- Clinton County78
- Johnson County77
- Caldwell County76
- Scotland County75
- Saline County74
- Grundy County73
- Pike County73
- Ray County72
- Livingston County69
- Mercer County69
- Lafayette County68
- Boone County68
- Chariton County67
- Howard County66
- Linn County66
- Macon County66
- Carroll County65
- Lewis County63
- Putnam County62
- Randolph County61
- Audrain County61
- Sullivan County59
- Moniteau County59
- Adair County57
- Shelby County56
- Marion County55
- Ralls County55
- Knox County54
- Monroe County53
- Schuyler County50
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
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.