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 FRIDAY 1 OCTOBER 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       9   12     650   0    100   17    2850  14
KAMLOOPS     KEL       9   12    1050   0    100   16    3350  14
OKANAGAN     KEL       9    8     550   0    100   16    2950  14
CASTLEGAR    SPOK     21    9     750   5     99   15    1550  16
CRANBROOK    SPOK      9    2     950  22    100    8    2950  15
REVELSTOKE   KEL       9    7     550   0    100   13    2550   9

*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    NW   9   N   24   N   37
CRANBROOK             VR   5   NW  13

TODAY'S VENTING: GOOD THIS AFTERNOON.

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.     41    3    1250  12    100    9    3950  13
PR. GEORGE   P.G.     23    1     800  12     78    7    1550  12
SMITHERS     P.G.     36    4     950   8     45    9    1650   5
WELLS GRAY   P.G.     41    1    1350  12    100   10    4000  13
FT NLSN      F.N.     68   -1    1350   9    100    3    3400  11
FT STJOHN    F.N.    100   -1    3700  11    100    2    3700  11

*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            N   20   N   39
SMITHERS              VR   5   NW  39

TODAY'S VENTING: GOOD EXCEPT FAIR IN THE NORTHWEST.

VENTING FOR SATURDAY: FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     37   12     400   9     46   15     550   9
FRASER VLY   QUIL     37   12     400   9     52   20    1000   5
SRN VRISL    QUIL     23   11     300   5     45   17     650   7
CNTRL VRISL  QUIL     36   13     450   7     53   19     800   7
NRN VRISL    HRDY     33   10     400   7     52   14     850   7
TERRACE      ANT       9    7     200  15    100   13    1600  19
STEWART      ANT      10    7      50   3    100   13    1450  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
VANCOUVER    NE  15   NE  19   N   31
PORT HARDY   N   19   NE  26   N   33
SANDSPIT     N   31   N   28   NW  37

TODAY'S VENTING: FAIR EXCEPT GOOD THIS AFTERNOON IN THE NORTH.

VENTING FOR SATURDAY: FAIR.




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


END/MWSO
$$$$^^