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Impact on policy from three severe weather events in the Omaha area in June, 2008 PowerPoint PPT Presentation


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Daniel Nietfeld – NOAA/NWS/WFO Omaha NE. Impact on policy from three severe weather events in the Omaha area in June, 2008. (and many other issues raised). Kansas City IWT Workshop: Using the WAS*IS Approach January 22, 2009.

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Impact on policy from three severe weather events in the Omaha area in June, 2008

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Daniel nietfeld noaa nws wfo omaha ne

Daniel Nietfeld – NOAA/NWS/WFO Omaha NE

Impact on policy from three severe weather events in the Omaha area in June, 2008

(and many other issues raised)

Kansas City IWT Workshop: Using the WAS*IS Approach January 22, 2009


Is this something you would want to be warned about would you expect the sirens to be blown

Is this something you would want to be warned about? Would you expect the sirens to be blown?


What was that

What was that ?

  • 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 ???


May 22 2004 hallam nebraska f4

May 22, 2004 Hallam, Nebraska F4

T


June 8 2008 omaha nebraska mid morning

June 8 2008: Omaha, Nebraska(mid-morning)


June 8 2008 omaha nebraska

June 8 2008: Omaha, Nebraska

NWS WCM

Home

Owner

Saw


2 10 2 30 am june 8 2008

2:10 – 2:30 AM June 8 2008


Storm relative velocity

Storm-Relative Velocity


The omaha policy on 8 june 2008

The Omaha Policy on 8 June, 2008

  • Sound the sirens when the NWS issues a tornado warning

  • IT HI T WITHOUT ANY WARNING !!!!!

    • (From the NWS, or from a siren perspective)


June 8 2008 omaha nebraska1

June 8 2008: Omaha, Nebraska

NWS WCM

Home

Owner

Saw


The aftermath of 8 june

The Aftermath of 8 June

  • Significant outcry

  • Meeting with the Mayor and Staff

  • Press Conference

  • 3 days of news coverage

  • Google “Omaha” “Tornadoes” “June 8”


11 june 2008

11 June 2008

Xavier

14 Yr Old Boy Scout

Note the scar


11 june 20081

11 June 2008

  • 4 Killed

  • 48 Injured


Had an outdoor warning device and noaa weather radio

Had an “outdoor warning device” and NOAA Weather Radio


Boy scout policy changes

Boy Scout Policy Changes

  • Must camp with a Severe Wx Trained adult

    • Severe weather training courses

    • Involving the IWT in groups such as Boy Scouts

  • Sirens / Outdoor warning devices

  • Storm Shelters


Impact on policy from three severe weather events in the omaha area in june 2008

What IF ?

Do you want a TOR

Inside a SVR ???


June 11 2008 tornado warnings in the omaha area

June 11, 2008 Tornado Warnings in the Omaha Area

  • 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?


27 june 2008

27 June 2008


Impact on policy from three severe weather events in the omaha area in june 2008

3-D KOAX Reflectivity at 2159 UTC (courtesy GR Level 2 Analyst)


June 27 2008

June 27, 2008


June 27 severe thunderstorm

June 27 Severe Thunderstorm

  • Hurricane force winds

  • Lasting for several minutes

  • Damage and debris was widespread

  • NO TORNADOES

  • (?What is the best product for this scenario?)


Damage survey

Damage Survey


Event impacts

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)

Event Impacts


Motivation new policy from lessons learned

MOTIVATION! New Policy from Lessons Learned! …

  • 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.


New policy

New Policy…

  • 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…


Conclusions

Conclusions

  • 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


What other lessons can be learned

What other lessons can be learned… (?)

  • Kansas City Metro area ?

  • Lincoln, Nebraska – spotter sighting only

    • Minimizing False Alarms

  • Flash flood policies ?


Post event activities

Post-Event Activities

  • 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.


Discussion questions

Discussion Questions

  • Siren Policies

  • Scout Camp issues

    • Shelters

    • Sirens

    • Should NWS Warnings have GIS data? (camps, etc…)

  • Polygon methodologies

  • Products that fit the event (wide range of Severe)


Daniel nietfeld noaa nws wfo omaha ne1

Daniel Nietfeld – NOAA/NWS/WFO Omaha NE

Impact on policy from three severe weather events in the Omaha area in June, 2008

(and many other issues raised)

Kansas City IWT Workshop: Using the WAS*IS Approach January 22, 2009


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