[willamette-fcst] Forecast - Tuesday, July 8th, 2008
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Tue Jul 8 08:01:23 PDT 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.
Tuesday, July 8th, 2008 at 9:00am.
...Due to the Olympic Trials in Eugene, ODA will not be issuing
any burning permits through July 8th....
Agricultural burning is not recommended.
Preparatory burning is not allowed.
Propane flaming is not allowed.
Stack burning is not allowed.
A broad but flat upper-level ridge of high pressure is
contining to build over the Pacific Northwest today. Today
will be another sunny and warm day across Oregon. The early
morning Salem sounding showed a few degrees of additional
warming aloft, since Monday morning, with continued
northeasterly transport winds. Surface temperatures started
warmer this morning than Monday morning with valley minimums
in the 50s. McMinnville was one of the cooler spots with a
low of 50. Eugene had a morning low of 54 degrees and Salem
bottomed out at 55.
The ODA surface analysis reflected the flat nature of the
upper-level ridge. Pressure gradients remainded onshore
this morning into the Washington and the extreme Northern
Oregon Coasts with some marine low clouds. Northerly gradients
prevailed across the remainder of the Oregon Coast and the
interior of Western Oregon under sunny skies. A thermal trough
continued to build northward into SW Oregon. Northerly winds
should increase to between 10 and 20 mph across the Willamette
Valley again this afternoon with gusts to near 30 mph in the
south valley. Temperatures will be at least 5 degrees warmer
today with highs near 90 degrees.
N 5-15 G20 south valley this morning, N 10-20 G30 south valley this afternoon.
NE 18 this morning, NNE 22 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 3500 feet. Ventilation index 77.
Salem\'s high temperature today will be near 90.
Relative humidity drops to 50% by 11am.
Minimum relative humidity will be near 26%.
Salem sunset tonight: 9:00pm; sunrise tomorrow: 5:35am.
The upper-level ridge will begin to flatten further, by late
Wednesday, in response to an upper-level trough cutting
across extreme Southern British Columbia. That will likely
increase the onshore flow across Western Oregon Wednesday
night and Thursday with temperatures cooling to near normal.
Transport winds may turn more northwesterly by Thursday
afternoon, which would improve valley ventilation conditions
for burning...especially north.
A transitory ridge is forecast to turn the low-level flow
northerly again Friday, with valley temperatures rebounding
back into the mid 80s. Another trough is forecast to
increase the westerly flow aloft and turn the surface flow
onshore again over the weekend. A stronger trough is
forecast to approach the coastline Monday with light showers
possibly extending southward into Western Washington and NW
Oregon by next Tuesday.
Tomorrow (09 Jul): Sunny. North Winds 10-20 mph. 55/91
Thu (10 Jul): Mostly Sunny & Cooler. Wind Becoming NW 10-20 in the Afternoon. 53/82
Fri (11 Jul): Areas of Morning Clouds. Mostly Sunny Afternoon. 50/85
Sat (12 Jul): Mostly Sunny but Cooler. 50/80
Sun (13 Jul): Morning Clouds. Afternoon Clearing. 51/78
Mon (14 Jul): Morning Clouds. Partly Sunny. 53/78
Tue (15 Jul): Mostly Cloudy. Slight Chance of a Light Shower North. 53/75
weather at oda.state.or.us
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