[willamette-fcst] Forecast - Friday, February 27th, 2009
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Fri Feb 27 09:09:24 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 Temperatures for Next Friday (March 6th) in Extended Forecast...
Friday, February 27th, 2009 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from 10:00am until 4:00pm.
Straw stack burning is allowed from 10:00am until 4:00pm.
The cold upper-level low-pressure system that moved across
Oregon Thursday rapidly pushed east of the region
overnight...allowing for clearing skies. Willamette Valley
temperatures dropped well below freezing overnight, with
areas of dense fog making for locally slick travel
conditions this morning. McMinnville dipped down to just 26
degrees this morning, and it was only 27 in Hillsboro.
Mid-morning temperatures were generally in the low 30s with
widespread fog and low clouds.
A transitory ridge of high pressure will likely allow for at
least partly sunny skies later today, but temperatures will
be well below normal. Valley highs will only raech the mid
to upper 40s. Normal valley highs, for late February, would
be the low to mid 50s. The ODA surface analysis showed weak
offshore pressure gradients. Light north-northeasterly
winds in the valley this morning may become light
southeasterly this afternoon. The freezing level over Salem
was just 1100 feet this morning and will slowly rise to
about 3000 feet this afternoon.
NE 0-5 this morning, ESE 5 this afternoon.
ESE 5 this morning, S 5 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 3000 feet. Ventilation index 15.
Salem\'s high temperature today will be near 48.
Minimum relative humidity will be near 60%.
Salem sunset tonight: 5:57pm; sunrise tomorrow: 6:51am.
Mostly clear skies this evening will lead to areas of fog
forming overnight. Valley temperatures should, once again,
drop to near or below freezing by Saturday morning. The next
weather system will increase clouds over the region Saturday
with a chance of rain by the afternoon. Increasing
southwesterly flow aloft should lift the snow level to near
or slighty above the Cascade passes. Rain is likely
Saturday night and Sunday, as the storm moves onshore. Snow
levels will hover around the Cascade passes Sunday, before
dropping to near 3000 feet Sunday night.
An upper-level trough will slowly move onshore Monday and
Tuesday with an ongoing threat of showers. Snow levels
should stay in the 3-4000 foot range. Valley temperature
will be near normal. A stronger and colder system is
forecast to bring more rain and mountain snow late Wednesday
and Thursday with showers continuing into Friday.
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. 36/51
Thu (05 Mar): Rain Turning to Showers. Snow Level Dropping to 2000 feet. 35/49
Fri (06 Mar): Showers. Mountain Snow. Snow Level Near 2000 Feet. 33/50
weather at oda.state.or.us
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