[willamette-fcst] Forecast - Wednesday, February 3rd, 2010
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Wed Feb 3 09:14:41 PST 2010
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, February 3rd, 2010 at 9:00am.
Recommended burn times for agricultural burning are from now to 3:30pm.
Stack burning is not allowed.
Satellite imagery showed cloudy skies covering most of
Oregon and Washington this morning, with areas of showers
rotating northward over both states. The freezing level is
near 5000 feet this morning, so the showers have been
falling as snow over the Cascade passes, although accumulations have
been minimal. Doppler radar showed a fairly impressive band of
showers rotating northward into south-central Washington, at mid-morning.
Another line of showers extended from around Newport to Salem to Eugene
and was moving northeastward. With the upper-level low pressure center
only about 100 miles off the central Oregon coast, the air aloft is
just cold enough to support possible thundershower development today,
especially along the coast and over the coastal range.
The morning ODA surface analysis showed weak offshore
gradients, in response the the approaching weather system.
Easterly winds will likely turn more southerly later today,
as the offshore low-presure center slowly migrates northward
along the Oregon coast. Generally cloudy skies and occasional
showers will combine with cool air aloft to keep western Oregon
temperatures mostly in the 40s today, which is normal for early
February. Several inches of new snow are possible over the Cascade
passes and ski areas. Cooler air aloft will improve ventilation
ESE 5-10 this morning, SSE 5-15 this afternoon.
SSE 10 this morning, SSE 15 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 2000 feet. Ventilation index 30.
Salem\'s high temperature today will be near 49.
Minimum relative humidity will be near 77%.
Salem sunset tonight: 5:23pm; sunrise tomorrow: 7:28am.
A transitory ridge of high pressure will bring brief drying
tonight and early Thursday, before another weather system
renews the steady rain and higher elevation snow Thursday
afternoon and night. Showers will continue into Friday,
with a split-flow jet steram pattern developing, typical of
El Nino. Once again, the real punch of approaching storms
will be directed south of the state, into California,
beginning later this week. It appears as if western Oregon
may have a few dry days early next week, with continued mild
Tomorrow (04 Feb): Rain Developing and Mild. Snow Level Rising to 4500 Feet. 38/50
Fri (05 Feb): Mostly Cloudy and Mild. Chance of Showers. Snow Level 4000 Feet. 38/54
Sat (06 Feb): Rain Developing...Mainly South. Snow Level 4000 Feet. 37/52
Sun (07 Feb): Areas of AM Fog...Partly Sunny and Mild. Snow Level 4000 Feet. 37/51
Mon (08 Feb): Increasing Clouds. Slight Chance of Rain Late. Snow Level 4500 Feet. 36/52
Tue (09 Feb): Mostly Cloudy. Slight Chance of Rain. Snow Level 5000 Feet. 40/54
Wed (10 Feb): Areas of AM Fog...Partly Sunny. 36/52
weather at oda.state.or.us
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