[willamette-fcst] Forecast - Monday, July 14th, 2008
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Mon Jul 14 07:11:17 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.
Monday, July 14th, 2008 at 9:00am.
Agricultural burning is not recommended.
Preparatory burning is not allowed.
Propane flaming is not allowed.
Stack burning is not allowed.
An upper level ridge of high pressure will shift slowly
eastward today. Surface pressure charts show the thermal
trough from the central valley of California, extending
northward into the Rogue Valley then weakly into the south
end of the Willamette Valley. Pressure gradients as of 8am
included: Newport to Salem, 0.1 mb onshore; Salem to
Redmond, 1.0 mb offshore; and Eugene to Medford, 2.4 mb
northerly. Obviously the Medford Draw is dominating.
Surface reports show low level flow is generally northerly
and computer models indicate this trend continuing. Warm
air aloft will limit mixing heights and it looks like the
maximum will struggle to reach about 3000 feet this
N 7-12 this morning, N 13-18 this afternoon.
NNE 12-18 this morning, N 15-20 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 3000 feet. Ventilation index 45.
Salem\'s high temperature today will be near 89.
Relative humidity drops to 50% by 9.
Minimum relative humidity will be near 25%.
Salem sunset tonight: 8:56pm; sunrise tomorrow: 5:41am.
The axis of the upper level ridge will be well to the east
of the area tomorrow and a trough of low pressure aloft will
be movinging into the Pacific Northwest. As the trough
nears, more cool marine air will move into the interior
valleys west of the Cascades. The trasition to a more
onshore flow could give a burn opportunity tomorrow or
possibly Wednesday, depending on timing. After midweek the
ridge of high pressure should slowly rebuild with warmer
Tomorrow (15 Jul): Sunny. 53/84
Wed (16 Jul): Partly Cloudy. 51/80
Thu (17 Jul): Partly Cloudy. 49/82
Fri (18 Jul): Sunny. 51/83
Sat (19 Jul): Sunny. 52/83
Sun (20 Jul): Sunny. 53/82
weather at oda.state.or.us
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