[willamette-fcst] Forecast - Wednesday, January 7th, 2009
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Wed Jan 7 09:12:01 PST 2009
Daily Smoke Management Forecast
Oregon Department of Agriculture
Smoke Management Program
Weather Outlook and Field Burning Advisory for Willamette Valley Growers and Fire Districts.
...Corrected Salem sunrise and sunset times...
Issued:
Wednesday, January 7th, 2009 at 9:00am.
Burn Advisory:
Agricultural burning is allowed. Suggested burn times are from now until 3:00pm.
Straw stack burning is allowed from now until 3:00pm.
Weather Discussion:
A very moist warm front was bringing heavy rain to western
Washington and extreme northwestern Oregon this morning,
along with strong southerly winds. Rain and wind will
continue to increase across western Oregon today, as the
frontal boundary sags southward. High wind warnings have
been issued for the northern and central coast, and the
northern coast range, for southerly gusts between 60 and 70
mph. Southerly winds in the Willamette Valley will gust to
between 30 and 40 mph with increasing rain.
The freezing levels over Oregon are near 10,000 feet. Flood
watches have been issued western Oregon due to melting snow
and increasing rain. The latest flood advisories can be
accessed at: http://www.wrh.noaa.gov/pqr/
Surface Winds:
S 15-25 G 35 this morning, S 15-25 G 35 this afternoon.
Transport Winds:
SSW 35 this morning, SSW 40 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 2500 feet. Ventilation index 88.
High Temperature:
Salem\'s high temperature today will be near 54.
Humidities:
Minimum relative humidity will be near 89%.
Sunrise/Sunset:
Salem sunset tonight: 4:48 pm; sunrise tomorrow: 7:49 am.
Extended Outlook:
A strong cold front will move onshore early Thursday morning
with locally heavy rain and strong winds continuing. South
winds could gust to around 60 mph along the coastal
headlands and beaches, and to near 70 mph in the northern
coastal range, until the cold front pushes east. Southerly
winds will continue to gust to near 40 mph in the Willamette
Valley through early Thursday. Cooler air aloft will drop
the snow level to near 3000 feet by Thursday evening with
the precipitation becoming more showery and focused mainly
on the western slopes of the coast range and Cascades.
Showers will taper off Thursday night, as an upper-level
ridge of high pressure begins building over the region.
Cooler overnight temperatures and moist low-level air will
likely lead to areas of fog in the western valleys by Friday
morning. Freezing levels will jump back above the Cascade
passes, but dry weather should help river levels drop and
ease flooding concerns.
The upper-level ridge will initially be rather flat.
Westerly flow aloft will allow another Pacific storm to slide
into western Washington Saturday. Some rain could make it
south into northwestern Oregon late in the day. The
upper-level ridge is forecast to amplify Sunday with the
flow aloft becoming northwesterly and drying out. The ridge
is forecast to move over the region early next week with dry
weather expected and freezing levels rising to more than
10,000 feet. Ventilation conditions will become stagnant.
Some easterly outflow from the Columbia Gorge will help to
clear skies in the north valley, but the south valley may
have fairly persistent fog Monday through Wednesday.
Thu (08 Jan): Rain and Windy...Turning to Showers. Snow Level Dropping to 3000 Feet. 48/50
Fri (09 Jan): Areas of AM Fog. Becoming Partly Sunny. 34/46
Sat (10 Jan): Areas AM Fog. Mostly Cloudy. Increasing Chance of Light Rain North. 32/46
Sun (11 Jan): Areas of AM Fog. Partial Clearing. 34/48
Mon (12 Jan): Areas of AM Fog. Partly Sunny. 33/50
Tue (13 Jan): Areas of AM Fog...Mainly South. Partly Sunny. 34/51
Wed (14 Jan): Areas of AM Fog...Mainly South. Partly Sunny. 34/51
ODA Meteorologist
weather at oda.state.or.us
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