FPCN39 CWLW 271400
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 FRIDAY 27 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      30   24     650   5     93   33    2450   7
KAMLOOPS     KEL      34   24     850   6     92   32    2600   7
OKANAGAN     KEL      26   23     750   5    100   35    3350   7
CASTLEGAR    SPOK     23   22     800   5     60   32    2300   4
CRANBROOK    SPOK      9   20     950   6     42   29    2450   3
REVELSTOKE   KEL      10   19     550   1     54   26    1400   6

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S    9   SW  17
CRANBROOK             VR   5   W   15

TODAY'S VENTING: GOOD OCCASIONALLY FAIR

VENTING FOR SATURDAY: 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.     48   15    2100   4    100   25    3950  11
PR. GEORGE   P.G.     39   15    1350   5    100   22    3700   9
SMITHERS     P.G.      9    9     500   2     60   12     900  10
WELLS GRAY   P.G.     48   15    2100   4    100   25    4000  11
FT NLSN      F.N.      9   10     400   2    100   18    3400  14
FT STJOHN    F.N.     21   10     800  10    100   15    3700  16

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   22   SW  44
SMITHERS              S   52   S   44

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     23   20     350   6     36   24     650   5
FRASER VLY   QUIL     30   22     500   6     52   30    1350   4
SRN VRISL    QUIL     18   18     250   4     31   23     500   5
CNTRL VRISL  QUIL     23   20     350   5     43   27     900   5
NRN VRISL    HRDY     16   15     150   6     37   18     350   9
TERRACE      ANT       9   11     250   8     73   14    1200  10
STEWART      ANT      10   10     100   1     40   14     500  10

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S   13   SW  28
PORT HARDY   S   35   S   57   S   65
SANDSPIT     S   82   S   87   S   85

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR SATURDAY: GOOD

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



END/mwso
$$$$^^