Alberta Broadcasters Public Alerting Recognition Symposium Meteorological Decision Making Image Courtesy Steve Ricketts.

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Presentation transcript:

Alberta Broadcasters Public Alerting Recognition Symposium Meteorological Decision Making Image Courtesy Steve Ricketts

Outline Alberta Summer Weather Weather Centre Operations Severe Weather Meteorologist Convective warnings Decision Making Process

Photo Courtesy Justin Hobson Elie Manitoba June 22, 2007

Alberta Convective Climate

Annual Alberta Svr Weather Events YearHailWindTornadoRainTotal Average

Weather Centre Operations PASPC Responsible for Public and Marine Forecasts & Warnings Edmonton & Winnipeg split the Responsibility Each office 2.4 people shifts, 24hrs per day, 365 days per year Automation leveraged Co located with Aviation forecast centre – CMAC in Edmonton Graphic Courtesy McCarthy 2007

Equivalent Areas of Responsibility Graphics Courtesy McCarthy

Means for Dissemination Weatheroffice web site. Most popular Web site in gc.ca domain… Specialized media site WeatherRadio ATADs Media Partners EPWS Warning Lead time for supercells/tornados is critical

Weather Radio Network in Alberta

Severe Weather Meteorologist Supervisor on shift Analysis/Diagnosis/Pr ognosis Highly trained Convective weather Radar interpretation Decision making Phases of shift Workup-anticipation Weather watch Heat of battle Bulletins Thunderstorm Watches/warnings Tornado Watches/warnings

Radar Critical and sophisticated tool Spirit River, Jimmy Lake Carvel, Strathmore, Schuler Measures hydrometeor intensity and radial motions Detects rotating storms (Supercells) but not tornadoes Ground reports critical for tornadoes Doppler coverage of southern and central Alberta is not continuous

Decision Making Information Analysis of temp, wind and moisture NWP guidance Radar and satellite –Monitor boundaries Lightning detection Soundings including aircraft Weather watchers Thunderstorm Options Watches - When to issue? Where? Type to issue? Thunderstorm Warnings – When? Where? Difference between a Watch and a Warning? Tornado warnings On busy days numerous bulletins can be in effect Photo copyright Neil Taylor

Decision Making EPWS Always Issue for Dangerous Supercells Tornado warnings require SPC to trigger EPWS Most effective way to deliver message Nerve racking task Practice is key Info includes storm/tornado location and motion Preset Forms Unusually strong Supercell Possible tornado (rotation detected within doppler range) Tornado on ground

Conclusion Weather Radio fills an important gap in our dissemination process because said radios can sleep until a programmed watch or warning id is received EPWS decisions add to the work load of the forecast team However, within Environment Canadas dissemination network there is no better means to quickly disseminate life threatening severe weather situations than the EPWS

Copyrighted and courtesy of Brad McLeod

Why do we activate EPWS?