[willamette-fcst] Forecast - Wednesday, April 2nd, 2008
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Wed Apr 2 10:09:01 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, April 2, 2008 at 12:00 pm.
Agricultural burning is allowed. Suggested burn times are from now until 5:30 pm.
Stack burning is not allowed.
An unseasonably cold northerly flow aloft continues over the
Pacific Northwest today. A weak upper-level disturbance
brought some clouds to NE Oregon early this morning, before
pushing southeastward to over Idaho. The remainder of
Oregon was under mostly clear skies this morning.
The dry and cold air mass lead to near record cold
temperatures once again this morning. Astoria set a new
record low of 29 degrees (old record 30 set in 1980).
Eugene tied their record low of 27 degrees (previously set
in 1980). For the second day in-a-row, Salem missed a
record low by 1 degree with a low of 27 (Salem\'s low
temperature Tuesday was 28). Hillsboro and McMinnville both
dropped to 28 degrees...just missing their record lows.
A multitude of record lows were broken yesterday morning
across Eastern Washington and Eastern Oregon, and I expect
that more records were broken this morning. Redmond tied
their April monthly record low Tuesday morning with 10
degrees. Meacham, in NE Oregon, significantly undercut
their daily record low of 11 degrees, set in 1999, with a
low Tuesday of 5. The Dalles also set a new daily record
low Tuesday morning with 25 degrees (the old record was 28
degrees back in 1982). It was slightly warmer in Meacham
this morning with a low of 15 degrees. Redmond and Rome
fell to 14, Baker City and Burns fell to 17, and Klamath
Falls dropped to 18. The Dalles tied their record low this
morning with 25 degrees (previously set in 1948), and
Pendleton set a new record daily low temperature record with
19 degrees (previously 20 in 1999).
The sounding over Salem this morning showed some warming and
drying aloft, so skies should stay sunny all day over
Western Oregon. The late-morning ODA surface analysis
showed northerly gradients across the state with valley
locations generally reporting north winds around 10 mph.
Northerly transport winds are not conducive to good valley
ventilation, so stack burning is not allowed again today.
Midday temperatures had warmed into the mid 40s across the
valley and should warm into the upper 50s this afternoon
under sunny skies. Mostly sunny skies will also prevail
over Central and Eastern Oregon this afternoon with highs
generally in the 50s.
N 10-15 G20 south valley this afternoon.
NNE 15 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 4000 feet. Ventilation index 60.
Salem\'s high temperature today will be near 59.
Minimum relative humidity will be near 33%.
Salem sunset tonight: 7:42pm; sunrise tomorrow: 6:48am.
Thursday should be the warmest day of the week from the
Willamette Valley eastward across the state, as the
upper-level ridge pushes over Washington and Oregon.
Northerly surface flow will turn onshore late in the day, as
a weak thermal trough moves inland and then east of the
Cascades. The dry air mass and fair skies will allow
morning minimums to dip near or below the freezing mark
across the Willamette Valley Thursday morning with afternoon
highs warming into the low to mid 60s.
Clouds will increase Thursday night, as a weather system
pushes through the upper-level ridge and approaches the west
coast. That should keep minimum temperatures above freezing
Friday morning. Afternoon temperatures in the valley will
be about 10 degrees cooler than on Thursday with highs in
the low to mid 50s. Rain will likely move onshore by late
Friday morning and spread across the state in the afternoon.
The snow level should drop to about 4000 feet by Friday
evening with accumulating snow possible over the Cascade
Passes and in the mountains of NE Oregon.
A weak transitory ridge is forecast to bring some drying and
warming early Saturday with another weather system moving
onshore late in the day. The long-range models are coming
into agreement on a fairly strong trough near the west coast
for early next week. That means more rain, mountain snow,
and below normal temperatures for Oregon...but we are used
to that by now.
Tomorrow (03 Apr): Mostly Sunny. 29/63
Fri (04 Apr): Showers Likely. Snow Level Dropping to 4000 Feet. 35/54
Sat (05 Apr): Mostly Cloudy. Rain Likely Late. Snow Level 4000 Feet. 35/54
Sun (06 Apr): Rain Turning to Showers. Snow Level 4000 Feet. 38/53
Mon (07 Apr): Rain Likely. Snow Level Dropping to 2500 Feet. 38/53
Tue (08 Apr): Showers Likely. Chance T-Storms with Hail. Snow Level 2000 Feet. 37/52
Wed (09 Apr): Mostly Cloudy. Chance of Showers. Snow Level 3-4000 Feet. 34/57
weather at oda.state.or.us
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