SMI South Central (Smoke Management Instructions) (no subject)
ODF Smoke Management Instructions
smi_south_central at listsmart.osl.state.or.us
Sun Nov 14 15:10:27 PST 2010
SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY
ISSUED: Sunday, November 14, 2010 2:40 PM Jim Little
1. DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625
Upper air charts show a high pressure area centered about 600 miles west of San Francisco and an upper level disturbance moving across the top of the high into British Columbia. This helps maintain a weak warm front that moves over the Pacific Northwest. Upper level winds will be northwesterly. Warmer air aloft with the warm front will stabilize the atmosphere somewhat but mixing heights should remain high enough for fair smoke dispersal conditions.
EXTENDED OUTLOOK (TUESDAY - THURSDAY)
The atmosphere further stabilizes Tuesday and smoke dispersal conditions become marginal. Transport winds will be generally westerly.
By Wednesday a deep low in the Gulf of Alaska, both at the surface and aloft, begins to influence weather in the Pacific Northwest. Winds turn southerly both at the surface and aloft. A surface cold front moves into western Washington then drops south into northwest Oregon by afternoon but rain will hold off until Thursday. Cooler air aloft on Thursday means a less stable atmosphere and improves smoke dispersal conditions.
Mixing height 2000 - 3000 ft during the morning. Afternoon and evening mixing rises to 2800 - 3800 ft.
Transport wind NNW to NNE at 15 - 29 mph during the morning. Transport wind decreases to NW to NNW at 12 - 22 mph during the afternoon and evening.
Surface wind NNW to NNE at 10 - 16 mph during the morning and afternoon. Surface wind decreases to W to NW at 4 - 8 mph during the evening.
Mixing height 1200 - 2200 ft during the morning rising to 1800 - 2800 ft during the afternoon. Transport wind W to NW at 10 - 20 mph. Surface wind SW to WNW at 4 - 8 mph during the morning becoming W to NW at 6 - 12 mph during the afternoon.
Mixing height below 1000 ft during the morning rising to 2500 - 3500 ft during the afternoon. Transport wind SSE to SW at 4 - 8 mph. Surface wind SSE to SSW at 4 - 8 mph.
Mixing height 2000 - 3000 ft during the morning rising to 4500 - 5000 ft during the afternoon. Transport wind S to SW at 4 - 8 mph during the morning becoming SW to W at 4 - 8 mph during the afternoon. Surface wind S to SW at 4 - 8 mph during the morning becoming SW to W at 4 - 8 mph during the afternoon.
3. BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Monday, November 15, 2010.
Avoid ignitions within 12 miles to the NW through NNE of SSRAs. For units that will smolder significantly through the night avoid burning within at least 20 miles to the W through NNE in or near drainages leading to SSRAs.
4. SPECIAL NOTE:
The smoke management forecaster is available at (503)
945-7401. The smoke management forecaster is available
to discuss specific burns. The duty forecaster phone
number is (503) 945-7401. Please call this number and
not individual's numbers to discuss daily burning. Please
avoid calling before 8 a.m. and between 2 to 3 p.m.
This forecast is available on the Internet at:
Please ensure your units have been planned and accomplished by checking:
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the SMI_South_Central