FPCN39 CWLW 011400
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT WEDNESDAY 1 SEPTEMBER 1999 FOR
TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      12   13     750   1     72   20    3200   3
KAMLOOPS     KEL      31   14    1300   2     72   22    3350   3
OKANAGAN     KEL      26   13    1200   2     72   21    3350   3
CASTLEGAR    SPOK     11   14    1100   0     48   22    3500   2
CRANBROOK    SPOK     42   12    2300   3     59   24    3950   2
REVELSTOKE   KEL      29   13    1300   2     72   17    3450   3

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   N    9
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: POOR THIS MORNING RISING TO FAIR TO GOOD THIS
AFTERNOON.

VENTING FOR THURSDAY: GOOD

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.      9   10     950  10    100   17    3950  10
PR. GEORGE   P.G.     17   10     850   5    100   16    3700  10
SMITHERS     P.G.     31   11     850   7     67   15    1450   9
WELLS GRAY   P.G.     28    9    1200  10    100   17    4000  10
FT NLSN      F.N.      9    9     400   6    100   20    3000   6
FT STJOHN    F.N.      9   12     700  10    100   18    3700  19

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   17   NW  19
SMITHERS              W   11   NW  19

TODAY'S VENTING: GENERALLY POOR THIS MORNING RISING TO GOOD AT ALL
LOCATIONS THIS AFTERNOON.

VENTING FOR THURSDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10   14     100   3     90   20    1900   7
FRASER VLY   QUIL     15   16     200   5    100   24    2700   8
SRN VRISL    QUIL     38   15     600   6     94   22    2400   6
CNTRL VRISL  QUIL     38   15     600   6     94   22    2400   6
NRN VRISL    HRDY     10   11     150   1     53   16     950   6
TERRACE      ANT       9   11     400   5     80   17    3000   8
STEWART      ANT       9   10     200   3     30   15    2000   5

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NE   9   NE  15
PORT HARDY   NW   9   VR   5   VR   5
SANDSPIT     S   19   S   13   VR   5

TODAY'S VENTING: POOR TO FAIR THIS MORNING RISING TO GOOD EXCEPT FAIR
OVER NORTHERN VANCOUVER ISLAND AND REMAINING POOR AT STEWART.

VENTING FOR THURSDAY: GOOD


VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


END/
$$$$^^