BORTAS A 2010-07

BORTAS A (2010)
BORTAS Meteorological and Air Quality Forecast for Halifax region (Boundary
Layer and Free Troposphere)
Issued: Tuesday, July 20, 2010
Issued by: Doug Steeves
Valid Today, Tonight and Wednesday with an outlook for Thursday
Quick overview: Low Potential influence from biomass burning aerosols through
the period.
Low Potential influence from LRT anthropogenic through period.
Synopsis/Synoptic Discussion:
Northern Saskatchewan and northwestern Manitoba continue to be the area of interest
for biomass burning. However the upper flow in that region remains light which is not
conducive to long range transport. US Smoke model shows no smoke over Atlantic
Canada through period.
There has been little change in the weather pattern with a large low over Labrador
both at the surface and aloft. A zonal flow persists across southern Canada and
northern US. This pattern will break down Wednesday night as an upper low forms in
a sharp trough over Montreal then moves over the Maritimes by Thursday.
GEM-MACH is showing a bogus area of high anthropogenic aerosols greater than 35
ug/m3 over much of mainland Nova Scotia this morning. This is not substantiated by
the monitoring network. Otherwise the main anthropogenic plume remains south of
the Maritimes.
Cloudy with sunny periods. No significant aerosols.
Cloudy periods. No significant aerosols.
Sunny with cloudy periods. A slight chance of showers in the afternoon. No significant
Outlook for Thursday: Periods of rain. Low potential for anthropogenic aerosols.
Low potential for biomass aerosols.
Contact: Doug Steeves
Contact number: 426-1717