[willamette-fcst] Forecast - Friday, July 11th, 2008
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Fri Jul 11 07:43:13 PDT 2008
Daily Smoke Management Forecast
Oregon Department of Agriculture
Smoke Management Program
Weather Outlook and Field Burning Advisory for Willamette Valley Growers and Fire Districts.
Friday, July 11th, 2008 at 9:00am.
Agricultural burning is not recommended.
Preparatory burning is not allowed.
Propane flaming is not allowed.
Stack burning is not allowed.
Upper level ridge continues to dominate the area weather.
This keeps the air mass fairly stable but allows daytime
temperatures to rise above normal throughout the Willamette
Valley. The thermal trough edged northward from California
to the southern Oregon coast. Doesn\'t appear that the
trough will hold its position and is forecast to slip
inland, into the western valleys by mid day. Result is that
slightly offshore low-level flow this morning gives way to
northerly winds through the afternoon.
The morning surface analysis shows a direct north to south
pressure gradient, and northerly wind flow will thus be
fairly brisk during the afternoon. Air quality looks fairly
good this morning but the winds will tend to concentrate any
generated pollutants in the south end of the valley.
N 7-12 this morning, N 13-18 this afternoon.
NNE 12-18 this morning, N 15-20 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 4300 feet. Ventilation index 65.
Salem\'s high temperature today will be near 90.
Relative humidity drops to 50% by 9.
Minimum relative humidity will be near 19%.
Salem sunset tonight: 8:58pm; sunrise tomorrow: 5:38am.
Upper ridge remains locked over the Pacific Northwest
through the weekend. By early next week, a minor
disturbance pushes through the ridge. This will increase
the onshore flow somewhat and may tend to turn the low-level
wind flow slightly more northwesterly. Disturbance looks
weak enough that precipitation in the interior looks
unlikely. The coast and Coast Range may see a little
precipitation but in the Willamette Valley the impact will
be predominately increased morning clouds.
Temperatures will cool as the marine air flow into the
Willamette Valley increases. Daytime temperatures are still
likely to be slightly above normal.
Tomorrow (12 Jul): Sunny. 49/90
Sun (13 Jul): Partly Cloudy. 52/88
Mon (14 Jul): Partly Cloudy. 53/82
Tue (15 Jul): Partly Cloudy. 52/80
Wed (16 Jul): Partly Cloudy. 51/82
Thu (17 Jul): Partly Cloudy. 52/81
Fri (18 Jul): Mostly Sunny. 53/83
ODF Meteorologist for
weather at oda.state.or.us
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