[willamette-fcst] Forecast - Tuesday, July 24th, 2007

[Willamette Valley Ag/Burning Forecast]

Daily Smoke Management Forecast




Oregon Department of Agriculture
Smoke Management Program
Weather Outlook and Field Burning Advisory for Willamette Valley Growers and Fire Districts.

Issued: 
     Tuesday, July 24th, 2007 at 9:00am.

Burn Advisory:
     Agricultural burning is allowed.  Suggested burn times are from 11:00am until 7:00pm.
     Preparatory burning is not allowed.
     Propane flaming is allowed from 1:00pm until 7:00pm.
     Stack burning is not allowed.

Weather Discussion:
     The muggy air mass that has been over the region since the
     middle of last week was replaced overnight by a more typical
     summer-time marine air mass.  Dew-point temperatures, which
     have been running in the lower 60s, dropped into the upper
     40s and low 50s this morning across Western Oregon.  The
     cold front responsible for this change moved through the
     Willamette Valley Monday evening and was already in Western
     Montana and Idaho this morning.

     High pressure raqpidly built eastward across Oregon
     overnight.  The Northern Willamette Valley was mostly clear
     by 8am, due to drying northerly winds.  A fair amount of
     low-clouds blanketed the central and southern valley this
     morning, but the north winds will help clear the skies by
     this afternoon.

     No preparatory or stack burning is allowed today due to north
     winds across the valley.  Open field burning, the day after a
     marine push, is seldom a good idea and unlikely today.

Surface Winds:
     N 8 this morning, N 10-14 this afternoon.
Transport Winds:
     NNE 15 this morning, NNE 15 this afternoon.
Atmospheric Ventilation Conditions:
     Maximum mixing height today will be near 5000 feet.  Ventilation index 75.
High Temperature:
     Salem\'s high temperature today will be near 80.
Humidities:
     Relative humidity drops to 50% by 1pm.
     Minimum relative humidity will be near 35%.
Sunrise/Sunset:
     Salem sunset tonight: 8:48pm; sunrise tomorrow: 5:50am.

Extended Outlook:
     Computer models show a more typical, dry, summer-time weather
     pattern throughout the extended outlook period.  West-southwesterly
     flow aloft will maintain onshore surface gradients, so
     tempertures are not expected to be far from normal. 
     There is a slight chance of showers...mainly for the northern valley,
     late Saturday into early Sunday, as a weak weather system moves across
     Washington and Northern Oregon.

Tomorrow (25 Jul):  Areas of Brief Morning Clouds...Sunny & Warm.  52/88

Thu (26 Jul):  Areas of Brief Morning Clouds...Sunny & Warm.  54/88

Fri (27 Jul):  Areas of Morning Clouds...Sunny & Warm.  55/86

Sat (28 Jul):  Partly Cloudy.  56/84

Sun (29 Jul):  Slight Chance of Shower Early.  Partly Cloudy Afternoon.  54/80

Mon (30 Jul):  Morning Clouds....Afternoon Sun.  52/83

Tue (31 Jul):  Brief Morning Clouds...Sunny & Warm.  53/88

ODA Meteorologist
weather at oda.state.or.us