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<p class=MsoNormal><b>SILVERTON HILLS FIELD BURNING FORECAST<o:p></o:p></b></p>
<p class=MsoNormal>OREGON DEPARTMENT OF FORESTRY WEATHER OFFICE<o:p></o:p></p>
<p class=MsoNormal>9:00 A.M. PDT FRI JUL 02 2010<o:p></o:p></p>
<p class=MsoNormal><b>TODAY’S BURNING ADVISORY:<o:p></o:p></b></p>
<p class=MsoNormal>Prep burning is not allowed. <o:p></o:p></p>
<p class=MsoNormal>Propane flaming burning is not allowed.<o:p></o:p></p>
<p class=MsoNormal><b>TODAY’S WEATHER DISCUSSION:<o:p></o:p></b></p>
<p class=MsoNormal>An upper level trough will bring cool and showery weather to
the northern Willamette Valley today. Fields are not ready for burning.<o:p></o:p></p>
<p class=MsoNormal><b>TODAY’S FORECAST: <o:p></o:p></b></p>
<p class=MsoNormal>Mostly cloudy and very cool with a few showers likely.
Surface winds will be S at 5-12 mph this morning; becoming W 5-15 mph this
afternoon. Transport winds will be SW at 8 mph this morning; becoming W
at 10 mph this afternoon. Maximum mixing height today will be 4000
feet. The ventilation Index will rise to 40 this afternoon.
Salem’s high temperature today will be near 65 degrees. The
relative humidity will drop to 50% around 2 p.m.<o:p></o:p></p>
<p class=MsoNormal>Salem’s sunset tonight is at 8:57 pm <o:p></o:p></p>
<p class=MsoNormal><b>EXTENDED DISCUSSION:<o:p></o:p></b></p>
<p class=MsoNormal>A drier northwesterly flow aloft is forecast for Saturday
and Sunday. An upper-level ridge will build over the region late Monday
through Wednesday. A surface thermal trough will build northward along
the coast with the transport winds turning offshore Tuesday and
Wednesday. Sinking air aloft and plenty of July sunshine will warm
northern Willamette Valley temperatures to well above normal. The ridge
may begin to back off the coast as next Thursday with increasing northwesterly
flow aloft. That is still a dry pattern, but the low-level flow would
turn back onshore…likely cooling temperatures back closer to normal by
Friday.<b><o:p></o:p></b></p>
<p class=MsoNormal><b>EXTENDED FORECAST:<o:p></o:p></b></p>
<p class=MsoNormal>Sat July 3<sup>rd</sup>: Chance of a morning
shower...becoming partly sunny. 49/71<o:p></o:p></p>
<p class=MsoNormal>Sun July 4<sup>th</sup>: Morning clouds. Partly
sunny in the afternoon. 49/73<o:p></o:p></p>
<p class=MsoNormal>Mon July 5<sup>th</sup>: Morning clouds…becoming
mostly sunny in the Afternoon. 50/75<o:p></o:p></p>
<p class=MsoNormal>Tue July 6<sup>th</sup>: Sunny and much warmer.
Northeast winds. 50/87<o:p></o:p></p>
<p class=MsoNormal>Wed July 7<sup>th</sup>: Sunny and very warm.
Northeast winds. 57/92<o:p></o:p></p>
<p class=MsoNormal>Thu July 8<sup>th</sup>: Sunny. Increasing
onshore flow late. 60/90<o:p></o:p></p>
<p class=MsoNormal>Fri July 9<sup>th</sup>: Patchy morning clouds.
Mostly sunny. 55/85<o:p></o:p></p>
<p class=MsoNormal><b>Notes: <o:p></o:p></b></p>
<p class=MsoNormal> 1. Mixing height, as used
here, is the lowest height at which the<o:p></o:p></p>
<p class=MsoNormal> potential
temperature exceeds the potential temperature at the surface. <o:p></o:p></p>
<p class=MsoNormal> As a
practical matter it is the approximate height to which a <o:p></o:p></p>
<p class=MsoNormal> smoke plume
will rise assuming good ignition, dry fuels, and <o:p></o:p></p>
<p class=MsoNormal> winds less
than about 15mph. <o:p></o:p></p>
<p class=MsoNormal> 2. Transport winds are a
layer average through the mixing height, <o:p></o:p></p>
<p class=MsoNormal> weighted
slightly toward the winds at the top of the layer. <o:p></o:p></p>
<p class=MsoNormal> 3. Ventilation Index is the
height of the mixing layer times <o:p></o:p></p>
<p class=MsoNormal> the
transport wind speed divided by 1000. <o:p></o:p></p>
<p class=MsoNormal> 4. Surface wind direction is
the general expected wind direction. <o:p></o:p></p>
<p class=MsoNormal> At a
specific point surface winds are highly dependent on <o:p></o:p></p>
<p class=MsoNormal> local
terrain conditions.<o:p></o:p></p>
<p class=MsoNormal><b>This forecast is provided under an agreement between the
Oregon Department of<o:p></o:p></b></p>
<p class=MsoNormal><b>Agriculture and the Oregon Department of Forestry.
For information contact ODA<o:p></o:p></b></p>
<p class=MsoNormal><b>at 503-986-4701.</b><o:p></o:p></p>
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