[willamette-fcst] Forecast - Wednesday, July 18th, 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: 
     Wednesday, July 18th, 2007 at 9:00am.

Burn Advisory:
     Agricultural burning is not recommended.
     Preparatory burning is not allowed.
     Propane flaming is not allowed.
     Stack burning is not allowed.

Weather Discussion:
     A Strong upper-level low pressure area, off the Southern
     Oregon Coastline this morning, was continuing to spread
     clouds and rain across Western Oregon.  Rainfall amounts, in
     the past 30 hours, have exceeded .10\" throughout the
     Willamette Valley, with Eugene recording a third of an
     inch.

     The steady rainfall will taper off to showers behind a
     northward-moving surface front, which was near Eugene at
     8am.  This front should reach Salem by 10am and Portland by
     noon.  Colder air aloft, in the wake of this front, may help
     trigger afternoon shower and thundershower development
     across the Willamette Valley.

     Due to wet conditions, burning is not allowed today.  With
     showers expected to continue through Thursday morning and
     more rain possible Friday, the potential for burning this week
     is low.

Surface Winds:
     Var 3 this morning, WSW 6 this afternoon.
Transport Winds:
     Var 3 this morning, WSW 10 this afternoon.
Atmospheric Ventilation Conditions:
     Maximum mixing height today will be near 3500 feet.  Ventilation index 35.
High Temperature:
     Salem\'s high temperature today will be near 72.
Humidities:
     Minimum relative humidity will be near 55%.
Sunrise/Sunset:
     Salem sunset tonight: 8:54pm; sunrise tomorrow: 5:44am.

Extended Outlook:
     An upper-level trough will move through Western Oregon
     Thursday morning, followed by brief drier weather through early
     Friday.  Another weather system will likely spread rain onto
     the Oregon Coastline Friday morning.  This front appears as
     if it will be strong enough to bring light rain into the
     Willamette Valley Friday afternoon, with the greatest
     potential for rain in the northern sections.

     Some dry weather is possible Saturday afternoon, with
     another weather system now forecast to makes its way onto
     the Oregon Coast Sunday morning.  This system will weaken,
     as it moves inland, but it may also be strong enough to bring
     light rain into the Willamette Valley...especially northern
     sections.

     The long-range computer models show the southwesterly flow
     aloft shifting northward, beginning Monday, which will bring
     drier and warmer weather to the region.  The next threat of
     a weather system moving into the region looks to be late on
     Wednesday.

Tomorrow (19 Jul):  Showers early.  Afternoon Clearing.  58/76

Fri (20 Jul):  Mostly Cloudy. Chance of Rain By Afternoon. 55/74

Sat (21 Jul):  Mostly Cloudy. Chance of Morning Showers. 59/77

Sun (22 Jul):  Increasing Clouds.  Slight Chance of Rain in the Afternoon.  59/79

Mon (23 Jul):  Becoming Mostly Sunny.  58/80

Tue (24 Jul):  Sunny.  58/88

Wed (25 Jul):  Increasing Clouds.  59/88

ODA Meteorologist
weather at oda.state.or.us