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<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>SILVERTON
HILLS FIELD BURNING FORECAST<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>OREGON
DEPARTMENT OF FORESTRY WEATHER OFFICE<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>12:00 PM PDT
THU JUL 08 2010<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>BURN ADVISORY:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Agricultural
burning is not recommended.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Prep burning
is not allowed. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Propane
flaming burning is not allowed. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>WEATHER
DISCUSSION:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>A strong ridge
of high pressure remains over the Pacific Northwest, but there are some changes
in the weather pattern today. The strong surface thermal trough that was just
off the northern Oregon coast on Wednesday has shifted eastward into the
Willamette Valley. That has changed the wind-flow pattern from offshore to
onshore along the coast with light winds in the Willamette Valley.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Midday visible
satellite imagery showed the marine low clouds, which briefly penetrated into
some of the western coastal range gaps this morning, had backed off to the
immediate coastline. Skies were sunny over the remainder of Oregon, except for
some shower and thunderstorm activity beginning to build up again across
extreme southwestern and south-central Oregon. Midday temperatures were
running about 5-8 degrees cooler than 24 hours ago, across the Willamette
Valley, and today’s forecast high temperature has been lowered a few
degrees.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>A weak
upper-level trough, just off the northern California coastline, will continue
to circulate enough moisture northward for afternoon showers and thunderstorms
over mainly southern Oregon. A few storms could push as far north as the
central Cascades, but the convective activity is forecast to stay south and
east of the Willamette Valley. The surface thermal trough is forecast to
remain over the valley through this afternoon and then shift eastward to over
the Cascades this evening. Light winds may turn northwesterly this evening,
with some cooler marine air beginning to filter into the Willamette Valley.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>TODAY:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Sunny and
hot. Light north winds turning northwesterly this evening. High near 95
degrees. Minimum relative humidity will be near 24%.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Salem Sunset:
8:55 pm <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>THREE-HOURLY
DATA: <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>
2pm 5pm 8pm <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>
Temperature: 89 94 86 <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> Relative
Humidity: 28% 24% 32% <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> Surface
Wind Direction: 350 340 330 <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> Surface
Wind Speed: 7 7 7 <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> Transport
Wind Direction: 360 350 340 <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> Transport
Wind Speed: 5 10 7 <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> Estimated
Mixing Height: 3000 3800 1500<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>
Ventilation Index: 15 38 10 <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>EXTENDED
DISCUSSION:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>A weak
upper-level trough is forecast to push across Oregon Friday with a return of
onshore flow cooling temperatures a few more degrees. There may still be a few
thunderstorms over the Cascades, but most of the convective activity should
remain well east of the Willamette Valley. A dry northwesterly flow aloft will
prevail Saturday through Tuesday with temperatures progressively cooling back
to near normal. Increasing onshore flow may bring patchy marine clouds into
the Willamette Valley by Sunday morning. The latest long-range models are now
showing a more significant trough moving into the region Wednesday and Thursday
of next week. That would further cool temperatures and possibly bring some
light showers.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>EXTENDED
FORECAST: <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Friday:
Mostly Sunny and a touch cooler. Wind: NW 5-12 mph. 58/92<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Saturday:
Mostly Sunny but cooler. Wind: NW 5-15 mph. 59/87<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Sunday:
Patchy morning clouds. Sunny in the afternoon. 56/85<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Monday:
Patchy morning clouds. Sunny in the afternoon. 55/85<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Tuesday:
Patchy morning clouds. Sunny in the afternoon. 53/82<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Wednesday:
Mostly cloudy. Slight chance of showers north. 52/77<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Thursday:
Mostly cloudy. Chance of showers…mainly north. 52/74<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>Notes:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> 1.
Mixing height, as used here, is the lowest height at which the<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>
potential temperature exceeds the potential temperature at the<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>
surface. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> As a
practical matter it is the approximate height to which a <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> smoke
plume will rise assuming good ignition, dry fuels, and <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> winds
less than about 15mph. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> 2.
Transport winds are a layer average through the mixing height, <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>
weighted slightly toward the winds at the top of the layer. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> 3.
Ventilation Index is the height of the mixing layer times <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> the
transport wind speed divided by 1000. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> 4.
Surface wind direction is the general expected wind direction. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'> At a
specific point surface winds are highly dependent on local<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>
terrain conditions.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal'><span style='font-size:10.0pt;font-family:"Courier New"'>This forecast
is provided under an agreement between the Oregon Department of<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;line-height:115%;font-family:
"Courier New"'>Agriculture and the Oregon Department of Forestry. For
information contact ODA at 503-986-4701.</span><o:p></o:p></p>
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