FPCN39 CWLW 201400
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 MONDAY 20 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      15   21     800   1     59   30    1700   4
KAMLOOPS     KEL      12   18     700   1     34   27    1450   2
OKANAGAN     KEL       9   16     500   0     30   26    1300   2
CASTLEGAR    SPOK      9   15     600   0     49   26    1600   4
CRANBROOK    SPOK      9   14     950   5     55   24    2200   5
REVELSTOKE   KEL       9   14     500   0     18   21    1050   2

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   NW  11

TODAY'S VENTING: GOOD IN THE FRASER CANYON AND EAST KOOTENAYS FAIR
ELSEWHERE.




VENTING FOR TUESDAY: POOR




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.     84   16    1600  18    100   22    2750  22
PR. GEORGE   P.G.      9   14     700   9    100   21    2250  17
SMITHERS     P.G.     10   12     600   2     42   19    1200   6
WELLS GRAY   P.G.     10    9     600   2    100   22    2800  22
FT NLSN      F.N.     98   17    2800  12    100   22    3000  24
FT STJOHN    F.N.    100   18    2850  28    100   22    3700  28

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   11   W   33
SMITHERS              SW  13   W   33

TODAY'S VENTING: GOOD EXCEPT FOR FAIR SMITHERS.




VENTING FOR TUESDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY     73   17     750  14     83   21    1000  13
FRASER VLY   HRDY     78   19     800  14    100   28    2000  10
SRN VRISL    HRDY     65   17     700  11     83   23    1100  11
CNTRL VRISL  HRDY     77   18     750  14     90   23    1100  13
NRN VRISL    HRDY     18   14     200   5     63   16     700  11
TERRACE      ANT      71   13    1400   8     97   18    2150   9
STEWART      ANT      33   13     600   4     88   18    1950   7

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   W   11
PORT HARDY   N   17   VR   5   SW  13
SANDSPIT     SW  17   SW  30   SW  44

TODAY'S VENTING: GOOD.




VENTING FOR TUESDAY: POOR




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


END/
$$$$^^