[willamette-fcst] Forecast - Wednesday, July 25th, 2007
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Wed Jul 25 08:35:03 PDT 2007
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, July 25th, 2007 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from 11:00am until 7:00pm.
Preparatory burning is not allowed.
Propane flaming is allowed from 12:00pm until 7:00pm.
Stack burning is not allowed.
With a drier air mass in place, overnight tempertures
dropped into the upper 40s and lower 50s in the Willamette
Valley...leading to widespread areas of ground fog early
this morning. Low clouds were limited mainly to coastal
regions this morning, with northerly surface gradients and
very weak onshore flow across Western Oregon.
Sunshine will prevail, over the Willamette Valley, through
Friday, with high pressure firmly in place across the
region. North winds will not be as strong today, as
pressure gradients have relaxed somewhat from yesterday.
Weak southwesterly flow aloft will prevent the surface
thermal trough, currently in Northern California, from building
northward into the Willamete Valley this week, so
temperatures will not rise much above seasonal normals.
No preparatory burning is allowed today, because of
northerly transport winds, and open field burning is
unlikely. The transport winds are forecast to become more
northwesterly tomorrow and Friday. We will closely monitor
this for possible field burning opportunities.
N 7 this morning, N 10 this afternoon.
N 10 this morning, N 15 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 4900 feet. Ventilation index 74.
Salem\'s high temperature today will be near 85.
Relative humidity drops to 50% by 12pm.
Minimum relative humidity will be near 31%.
Salem sunset tonight: 8:47pm; sunrise tomorrow: 5:51am.
A weak weather system is still forecast to slide into
Western Washington late Saturday, which will increase the
onshore flow across Western Oregon. That will cool high
temperatures to near or slightly below seasonal normals
Sunday and Monday. There is also a slight chance of
showers, especially in the Northern Willamette Valley,
Saturday night and Sunday morning.
Computer models are indicating that surface gradients will be
northerly on Monday, which would not be conducive to
burning. By Tuesday and Wednesday, the onshore flow
decreases and the transport winds are forecast to become
northwesterly...which increases the burning potential.
Tomorrow (26 Jul): Sunny. 53/87
Fri (27 Jul): Mostly Sunny. 55/86
Sat (28 Jul): Areas of Morning Clouds...Mostly Sunny Afternoon. 56/83
Sun (29 Jul): Slight Chance of Morning Showers. Partly Sunny Afternoon. 56/78
Mon (30 Jul): Morning Clouds...Mostly Sunny Afternoon. 51/82
Tue (31 Jul): Mostly Sunny. 53/85
Wed (01 Aug): Mostly Sunny. 54/85
weather at oda.state.or.us
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