[willamette-fcst] Forecast - Wednesday, April 23rd, 2008
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Wed Apr 23 08:15:28 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.
Wednesday, April 23rd, 2008 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from now until 6:00pm.
Straw stack burning is allowed from now until 6:00pm.
After a soggy and cool day Tuesday, a strong and slow-moving
cold front moved through Western Oregon Tuesday night with
locally heavy rain and mountain snowfall. Rainfall amounts
in the 24-hour period ending at 5 am this morning were
generally one-half to one inch along the coast and one-third
to two-thirds of an inch across the Willamette Valley.
After starting out around 1500 feet Tuesday morning, snow
levels only climbed to about 4000 feet ahead of the cold
front Tuesday afternoon, so precipitation fell mainly as snow
in the Cascades. The passes picked up several inches of new
snow and the ski areas received 6-10 inches of fresh powder.
It has been a wintry week in the mountains with Timberline
Lodge picking up 22 inches of new snow since Sunday morning.
On a side note...The snowpack usually peaks around April 1st
in the Cascades, but it is still piling up as of late April
this year. Timberline now has an amazing base total of 232
inches. The well above average snowpack bodes well for the
summer water supply outlook, but there is some concern for
flooding. It should be noted that major flooding usually
occurs in the winter, when rapid snow-melt is accompanied by
heavy rain. That scenario is not likely once we get out of
the winter season.
Back to the current weather...The ODA surface analysis
showed a farily strong low-pressure center just off the
Northern Oregon Coast with strong southerly gradients along
most of the coast and in the Willamette Valley. That
generated some brisk southerly winds early this morning.
Some of the peak gusts along the coast were...
Cape Mears (1421 Feet above Tillamok): 36 mph
Lincoln City: 52 mph
Gleneden Beach: 40 mph
Cape Foulweather: 47 mph
Yaquina Bridge (Newport): 53 mph
Newport Airport: 44 mph
Yachats: 45 mph
In the Willamette Valley, some of the peak gusts were...
Hillsboro: 28 mph
McMinnville: 40 mph
Salem: 40 mph
Corvallis: 23 mph
Eugene: 28 mph
Winds were still gusting near their peak values across most
of the region at mid-morning with the low-pressure center
almost due west of Astoria. It is forecast to slowly weaken
and move inland, near the mouth of the Columbia river, this
aftenoon, so conditions will remain blustery today across
Western Oregon. The cold front moved east of the Cascades
early this morning and was bringing some rain and snow
showers to the eastern third of Oregon at mid-morning.
The associated cold upper-level trough will circulate
showers across the region this afternoon with the snow level
near 2000 feet. Cold air aloft and daytime heating may
combine to help the showers develop into thunderstorms with
small hail this afternoon. Clouds, rain, and wind helped to
hold valley temperatures in the low 40s overnight, but
afternoon temperatures will be about 10 degrees below normal
again today with highs only in the low 50s.
The upper-level trough is forecast to move eastward to over
Idaho by early Thursday with a continued cool, but drier,
northwesterly flow aloft over Oregon. That will likely
bring partial clearing to the region overnight, so surface
temperatures will be allowed to drop into the mid to upper
30s west of the Cascades.
Onshore flow and cold air aloft will keep a chance of showers
over the Willamette Valley Thursday with a few snow showers
over the Northern Cascades. Ventilation conditions should remain
good for burning through Thursday.
S 15-25 G35 this morning, SW 10-20 G30 this afternoon.
S 40 this morning, SW 30 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 5000 feet. Ventilation index 200.
Salem\'s high temperature today will be near 51.
Minimum relative humidity will be near 66%.
Salem sunset tonight: 8:08pm; sunrise tomorrow: 6:12am.
The next upper-level trough is forecast to slide mainly across
Washington on Friday, as a more westerly flow aloft sends a warm
front into Western Oregon. High pressure will build over the
Pacific Northwest Saturday and Sunday for some drying and warmer
conditions. The next weather system is forecast to move onshore
as early as Sunday afternoon with rain and cooler weather returning
by Monday and lasting well into next week.
Thu (24 Apr): Mostly Cloudy. Chance of Showers. Snow Level Rising to 3000 Feet. 37/56
Fri (25 Apr): Light Rain Developing. Snow Level Rising to 5000 Feet. 36/56
Sat (26 Apr): Chance of AM Rain...Becoming Partly Sunny and Warmer. 42/65
Sun (27 Apr): Increasing Clouds But Mild. Chance of Light Rain. 44/65
Mon (28 Apr): Rain Likely and Cooler. 45/58
Tue (29 Apr): Showers. Chance T-Storms. Snow Level 2500 Feet. 40/55
Wed (30 Apr): Showers. Chance T-Storms. Snow Level 2500 Feet. 40/57
weather at oda.state.or.us
More information about the willamette-fcst