[willamette-fcst] Forecast - Tuesday, November 24th, 2009

[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, November 24th, 2009 at 9:00am.

Burn Advisory:
     Agricultural burning is not recommended.
     Stack burning is not allowed.

Weather Discussion:
     A weak cold front sagged southward overnight and was falling
     apart over extreme northern Oregon this morning.  Doppler
     radar and surface reports indicated some rain was falling
     along the northern Oregon Coast and inland as far south as
     the extreme northern Willamette Valley.  The rain was
     falling moderately in the Astoria area, with over two-thirds
     of an inch coming down since midnight.  The rainfall was
     much lighter inland, with Portland just picking up trace
     amounts so far today.

     The weak front is forecast to lift northward this afternoon,
     as a warm front, with an upper-level ridge of high pressure
     building over Oregon.  The rain should taper off along the
     north coast by this afternoon, with dry conditions expected
     over the remainder of the state.  Satellite imagery showed
     breaks in the clouds over much of the central and southern
     Willamette Valley at mid-morning.  Temperatures were in the
     mild mid to upper 40s.  With some sunbreaks again this
     afternoon, highs should climb into the low to mid
     50s...above normal for late November.

Surface Winds:
     SE 5-10 this morning, SE 5-10 this afternoon.
Transport Winds:
     S 10 this morning, S 6 this afternoon.
Atmospheric Ventilation Conditions:
     Maximum mixing height today will be near 1500 feet.  Ventilation index 15.
High Temperature:
     Salem\'s high temperature today will be near 56.
Humidities:
     Minimum relative humidity will be near 45%.
Sunrise/Sunset:
     Salem sunset tonight: 4:36pm; sunrise tomorrow: 7:23am.

Extended Outlook:
     Dry and mild conditions should prevail from late Tuesday
     through midday Thursday, with another wet weather system
     moving onshore Thanksgiving afternoon.  Steady rain should
     turn to showers Friday, with snow making for wintry travel
     over the mountain passes.  Travel conditions are forecast to
     improve Saturday through Monday, with a ridge of high
     pressure bringing mostly dry and mild conditions to the region.

Tomorrow (25 Nov):  Areas of AM Fog.  Partly Sunny and Mild.  39/56

Thu (26 Nov):  Rain Developing in the Afternoon.  40/54

Fri (27 Nov):  Showers.  Snow Level 3000 Feet.  39/49

Sat (28 Nov):  Mostly Cloudy.  Chance of Sprinkles North.  35/48

Sun (29 Nov):  Partly Sunny.  36/51

Mon (30 Nov):  Partly Sunny.  35/53

Tue (01 Dec):  Partly Sunny.  33/48

ODA Meteorologist
weather at oda.state.or.us