[willamette-fcst] Forecast - Wednesday, January 30th, 2008
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Wed Jan 30 09:10:41 PST 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.
Wednesday, January 30th, 2008 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from 10:00am until 3:30pm.
Straw stack burning is allowed from 10:00am until 3:30pm.
A cold upper-level trough brought locally heavy rain and
snow showers to Western Oregon overnight and early this
morning. Most of the sticking snow fell in the hills. 2-3
inches of snow fell in the west hills of Portland, above 500
feet, which was the greatest snowfall there this winter.
The Cascades picked up about a foot of new snow overnight.
The foothills above 1000 feet, east of Salem, picked up 4+
inches of new snow, and the coast range received a couple
more inches. Wet snow was able to briefly accumulate, under
heavy showers, down to the valley floors. Corvallis and
Salem both received a coating of wet snow.
The showers and brisk southerly winds helped keep valley
floor temperatures near to slightly above freezing
overnight. By mid-morning temperatures had warmed into the
mid 30s. Satellite and radar imagery both show some
showers still rotating onshore into NW Oregon this morning.
The freezing level was measured over Salem early this
morning at 2000 feet, so the snow levels have likely risen
to between 500 and 1000 feet over Northwest Oregon, but snow
could still mix to the valley floors under the heavier
The upper-level trough will quickly shift east of the region
with showers decreasing later this morning. High
temperatures will climb into the low 40s across the valley.
Clouds from the next weather system are already moving
Steady rain will return to the coastline later this afternoon
and move into the valley this evening. Warmer air aloft will
lift snow levels to about 2500 feet tonight with more heavy snow
expected in the Cascades. Strong southerly winds may also hit the
coastline tonight, where high wind watches are in effect for gusts
to 65 mph. Ventilation conditions will be good for burning today.
S 10-20 this morning, S 10-20 this afternoon.
SW 20 this morning, SW 25 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 3000 feet. Ventilation index 75.
Salem\'s high temperature today will be near 42.
Minimum relative humidity will be near 85%.
Salem sunset tonight: 5:17pm; sunrise tomorrow: 7:33am.
The cool stormy pattern is forecast to continue through the
week with low snow levels at times and heavy snow expected
in the mountains. A cool trough will follow tonight\'s storm
with showers and low snow levels Thursday and Friday.
The next system is forecast to take a more southern track with
the low-pressure center taking aim at northern Oregon. That
track will keep snow levels near or below 1000 feet across
Western Oregon Saturday. This storm will need to be monitored
closely for the possibility of snow levels dropping to the valley
floors, if it takes a more southern track. In any case, more
showers are on tap for Sunday with continued very low snow levels.
It appears that a transitory ridge will bring some drying on
Monday with the next weather system bringing more rain and
mountain snow by Tuesday afternoon. Another weak ridge will
bring some drying Wednesday.
Thu (31 Jan): Rain and Wind...Turning To Showers. Snow Level Dropping to 1000 Feet. 37/43
Fri (01 Feb): Showers. Snow Level 1000 Feet. 34/42
Sat (02 Feb): Rain Turning to Showers. Snow Level Near or Below 1000 Feet. 33/42
Sun (03 Feb): Showers. Snow Level Near 1000 Feet. 33/42
Mon (04 Feb): Partly Cloudy. 31/43
Tue (05 Feb): Rain and Windy. Mountain Snow. 34/46
Wed (06 Feb): Decreasing Showers. 34/46
weather at oda.state.or.us
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