FPCN39 CWLW 171400
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 TUESDAY 17 AUGUST 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      15   16     200   5     74   26    1750   6
KAMLOOPS     KEL      15   16     400   6    100   27    2750  10
OKANAGAN     KEL      15   13     400   6     86   26    2100   7
CASTLEGAR    SPOK     12   16     550   5     40   25    1200   5
CRANBROOK    SPOK     12   11    1050   5     46   24    2400   3
REVELSTOKE   KEL      10   13     500   7     50   22    1450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   SW  28
CRANBROOK             W    9   W   20

TODAY'S VENTING: GOOD WEST TO  FAIR EAST

VENTING FOR WEDNESDAY: GOOD TO FAIR

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.     15   13    1050  10    100   22    3950  21
PR. GEORGE   P.G.     15   13     750  10     94   19    1450  20
SMITHERS     P.G.     10   13     600   7     42   18     850  11
WELLS GRAY   P.G.     15   13    1050  10    100   22    4000  21
FT NLSN      F.N.      9   16     400   3     72   24    1200  11
FT STJOHN    F.N.     18   15     750  14     81   22    1500  14

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   22   SW  28
SMITHERS              S   33   SW  28

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR WEDNESDAY: GOOD TO FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10   15     150   4     35   23     950   3
FRASER VLY   QUIL     15   17     200   3     52   27    1700   3
SRN VRISL    QUIL     10   15     150   4     37   23     900   4
CNTRL VRISL  QUIL     10   16     150   4     49   26    1450   3
NRN VRISL    HRDY     15   17     200   7     34   18     450   7
TERRACE      ANT      34   14     250  20    100   17    1200  45
STEWART      ANT      27   14     250  20    100   17     750  34

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE   9   S   24   S   37
PORT HARDY   S   31   S   50   S   57
SANDSPIT     SW  13   S   30   S   48

TODAY'S VENTING: FAIR SOUTH TO GOOD NORTH

VENTING FOR WEDNESDAY: GOOD TO FAIR

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


END/MWSO
$$$$^^