[willamette-fcst] Willamette Valley Ag Weather Forecast
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Thu Feb 26 09:26:37 PST 2009
Oregon Department of Agriculture
Smoke Management Program
Weather Outlook and Field Burning Advisory for Willamette
Valley Growers and Fire Districts.
Thursday, February 26th, 2009 at 9:00am.
Agricultural burning is allowed. Suggested burn
times are from 9:00am until 4:00pm.
Straw stack burning is allowed from 9:00am until
A cold upper-level low-pressure system slowly sagged
southward, along the Washington Coast, last night.
circulated cold Arctic air, from southern British
over the warmer ocean waters and then inland across
Washington and Oregon. That increased the shower
with progressively lowering snow levels. By early
morning, wet snow showers were falling down to sea
along the Oregon coast and down to the floor of the
Doppler radar showed the main area of snow showers
from just south of Portland to near Corvallis and
from the coast to the creast of the Cascades.
locally covered in slush along the I5 corridor with
up to a
couple of inches of snow reported on the eastern
side of the
valley near Stayton. Several inches of snow fell
coastal and Cascade passes with more than a foot of
reported at the ski areas on Mt. Hood. More than 4
snow have fallen in the past 72 hours at Timberline
Winter Weather Advisories are in effect until noon
northern and central Willamette Valley, north of
snow showers with local minor accumulations of wet
More significant snow accumulations are still
the coastal and Cascade passes. As the upper-level
low-pressure system moves east of the Cascades this
afternoon, showers will should rapidly taper off
western Oregon with the snow level rising to about
feet. Willamette Valley temperatures should recover
the mid 40s this afternoon, after hovering near the
mark through mid-morning.
The ODA surface analysis showed an Arcitc frontal
extending from just north of Seattle to near
Washington. North of that line, temperatures were
below freezing with cold northerly winds. The
of the cold front that brought the low-elevation
Oregon was pushing into Idaho at mid-mornig.
showed to showers beginning to taper off across
Oregon. Winds were mostly southwesterly in the
Valley between 5 and 15 mph. Showers had ended
coast, at Newport, where northwesterly winds were
near 30 mph. That is an indication that drier
will be moving into the interior valleys later this
WSW 5-15 G20 this morning, WSW 5-15 this afternoon.
WSW 20 this morning, W 15 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 4000 feet.
Ventilation index 80.
Salem\'s high temperature today will be near 45.
Minimum relative humidity will be near 55%.
Salem sunset tonight: 5:56pm; sunrise tomorrow:
The upper-level low-pressure system is forecast to
Idaho tonight with showers ending and skies clearing
Oregon. That will allow for much colder overnight
temperatures. Valley minimums will likely drop into
to upper 20s most areas. Please be aware that wet
surfaces may freeze and create locally slick driving
conditions through early Friday. There may also be
morning fog. A transitory ridge of high pressure
likely allow for at least partly sunny skies Friday,
temperatures will be well below normal.
Mostly clear skies Friday evening will lead to areas
forming Friday night. Valley temperatures should,
again, drop to near or below freezing by Saturday
The next weather system will increase clouds over
Saturday with a chance of rain by the afternoon.
southwesterly flow aloft should lift the snow level
or slighty above the Cascade passes. Rain is likely
Saturday night and Sunday, as the storm moves
levels will hover around the Cascade passes Sunday,
dropping to near 3000 feet Sunday night.
An upper-level trough will slowly move onshore
Tuesday with an ongoing threat of showers. That
should not be nearly as cold as the one that came
the region this morning, so snow levels should stay
3-4000 foot range. Valley temperature will be near
A stronger and colder system is forecast to come
late Wednesday and Thursday.
Tomorrow (27 Feb): Very Cold Start. Partly Sunny and
Cool Afternoon. 25/48
Sat (28 Feb): Increasing Clouds. Chance of PM Rain.
Snow Level Rising to 4000 Feet. 31/49
Sun (01 Mar): Rain. Snow Level 4000 Feet...Dropping to
3000 Feet Late. 39/52
Mon (02 Mar): Showers. Snow Level 3-4000 Feet. 37/51
Tue (03 Mar): Mostly Cloudy. Chance of Showers. Snow
Level near 4000 Feet. 37/52
Wed (04 Mar): Rain Increasing. Snow Level 3-4000 Feet.
Thu (05 Mar): Rain Turning to Showers. Snow Level
Dropping to 2000 feet. 35/49
weather at oda.state.or.us
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