SMI West (Smoke Management Instructions) Western Oregon Smoke Management Instructions

Thu Jun 3 14:22:15 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, June 3, 2010       2:30 PM      Pete Parsons

1.  DISCUSSION AND FORECAST FOR THE WESTERN OREGON AREA FORECAST ZONES 601-623

    FRIDAY

An unseasonably strong westerly jet stream will direct another potent Pacific storm across Oregon.  Moderate to heavy rainfall is expected across all zones in the morning with steady rain becoming more showery in the afternoon.  A surface low-pressure system is forecast to track across extreme northwestern Oregon and western Washington in the early morning and then rapidly move into northeastern Washington in the afternoon.  It is not forecast to be a real strong low-pressure system, but the forecast track is favorable to bring brisk southerly winds to the coast and coastal range with breezy conditions extending eastward into the Cascades.  Clouds and rain will keep temperatures well below normal, but the snow level is expected to stay above 6000 feet.  High mixing heights and strong transport winds will make for good smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)

Saturday will be a break between storms, but the strong westerly jet stream will direct a weaker weather system across mainly the northern half of the state Sunday.  Some drying is expected again on Monday with temperatures moderating to near normal.  Daytime smoke dispersal conditions should be fair to good during the period, although transport winds will be light on Saturday.  The long-range computer models show wet conditions possibly returning later next week.

2.  DISPERSION

Zone 601, 602, 603 and 612 (North Coast Range):

MORNING

Mixing height 3000 - 4000 ft.

Transport wind W at 18 - 32 mph.

Surface wind W to NW at 10 - 20 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind decreases to WSW to WNW at 10 - 16 mph.

Surface wind W to NW at 9 - 15 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind decreases to W to NW at 5 - 9 mph.

Surface wind decreases to W to NW at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 3000 - 4000 ft.

Transport wind SW at 18 - 32 mph.

Surface wind SSW to WSW at 10 - 20 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind decreases to WSW to WNW at 10 - 20 mph.

Surface wind WSW to WNW at 10 - 16 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind decreases to WSW to NW at 6 - 10 mph.

Surface wind decreases to W to NNW at 5 - 9 mph.

Zone 615-623 (South Coast Range and Cascades):

MORNING

Mixing height 3000 - 4000 ft.

Transport wind SW at 18 - 32 mph.

Surface wind SSW to WSW at 10 - 20 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind shifts to WSW to WNW and decreases to 9 - 15 mph.

Surface wind shifts to WSW to WNW at 8 - 12 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind shifts to WNW to NNW and decreases to 4 - 8 mph.

Surface wind shifts to NW to N at 4 - 8 mph.

OUTLOOK:

SATURDAY

In the Coast Range mixing height below 1000 ft early rising to 2300 to 3300 ft by late morning rising to 3900 to 4900 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 3800 to 4800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind E to SSE at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

SUNDAY

Mixing height 2300 to 3300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 15 - 25 mph during the morning becoming SW to W at 13 - 25 mph during the afternoon.  Surface wind S to SW at 8 - 14 mph during the morning becoming WSW to WNW at 10 - 16 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind N to ENE at 6 - 12 mph during the morning becoming NNW to NNE at 10 - 20 mph during the afternoon.  Surface wind NNE to ENE at 6 - 10 mph during the morning becoming NNW to NNE at 8 - 14 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA

These instructions are valid for burning conducted on Friday, June 4, 2010.

=================================================================

Coast Range

Zone 601 and 612

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.

Zone 602, 603, and 620

Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Avoid burning in or near corridors.  Higher tonnage is possible south of the Siuslaw River in Zone 603.  Call the forecaster.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

Zone 615

Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W

Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618

Use standard guidance matrix. (See section 5 below.)

Zone 619

Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Cascades

All zones except Zone 610 and 611

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T15S through T20S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

Zone 610 and 611

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Siskiyous

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

==============================================================

4.  SPECIAL NOTE:

    Call the smoke management duty forecaster at (503) 945-7401 to

    discuss burning.  Please do not call individual's numbers to

    discuss daily burning.  If the forecaster is not available,

    leave a message and he will return your call as soon as possible.

    Avoid calling between 2 to 2:30 p.m.

    The forecast is available on the Internet at:

      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management

    Please ensure your units have been planned and accomplished by checking:

      http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml

5.  STANDARD GUIDANCE MATRIX:

  * Greater than 5000 ft mixing height:  No burning within 5 miles of

    downwind SSRA.  Maximum 100 tons per mile from downwind SSRA.

    Example:  500 ton maximum allowed if burned 5 miles from downwind SSRA.

  * 3000 - 5000 ft mixing height:  No burning within 10 miles of

    downwind SSRA.  Maximum 75 tons per mile from downwind SSRA.

    Example:  750 ton maximum allowed if burned 10 miles from downwind SSRA.

  * Less than 3000 ft mixing height:  No burning within 15 miles of

    downwind SSRA.  Maximum 50 tons per mile from downwind SSRA.

    Example:  750 ton maximum allowed if burned 15 miles from downwind SSRA.

  * All exceptions must be coordinated with the duty forecaster

    prior to ignition.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_west/attachments/20100603/883826ad/attachment.html>