Did it seem dangerous, or even life-threatening? Rear flank downdraft (straight-line winds) Behind a tornadic supercell (Hallam, NE) What would be the best way to handle this scenario with a warning, and any associated siren blowing ??? What would be a good polygon solution for this scenario ???
Tornado Warnings off/on 715 pm – 10 pm Sirens off/on for nearly 3 hours Were polygons too large? (We were operating without a radar at times) Should we take these political boundaries into account?
Storm statistics: Path length: 90 miles Path width: 4 to 6 miles Estimated maximum wind speeds: 110-115 mph (EF2) One fatality (tree fell on car in Council Bluffs, IA) and several minor injuries Damage estimate: $53+ million in Douglas County (Omaha)
When to activate: When the National Weather Service initiates a Tornado Warning for any portion of Douglas County. When a public safety official or trained storm- spotter states that s/he is in site of a rotating funnel cloud or tornado within Douglas County. When Douglas County 911 receives credible reports of damage or the eminent threat of hurricane-force sustained winds equal to or greater than 74 mph.
During night-time conditions or in the absence of adequate warning, the on-duty 911 supervisor can direct an activation of the outdoor warning sirens if he/she determines that lives may be saved and injuries averted by alerting the public to the severe weather condition. Getting a bit vague here…
Original Policy was product driven and failed when the science did not permit the proper product to be issued Revised Policy was more impact driven, and worked when a life-threatening (but non- tornadic) weather event occurred
Kansas City Metro area ? Lincoln, Nebraska – spotter sighting only Minimizing False Alarms Flash flood policies ?
June 8 Local Media flurry Live press conference with Mayor and 911 Director June 11 National Media June 27 Local Media Insurance companies, lawyers, roofing companies, etc.