FPCN39 CWLW 131348
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 PST SATURDAY 13 FEBRUARY 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      55    5     500  15     69    7    2500  18
KAMLOOPS     KEL      27    5     750   5     57    7    2500  14
OKANAGAN     KEL      12    3     500   2     57    6    2500  14
CASTLEGAR    SPOK     25    0     750   6     45    3    2500   8
CRANBROOK    SPOK      9   -4     950  15     49    1    2550  10
REVELSTOKE   KEL       9    0     450   2     50    2    2500   8

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  19   SW  43
CRANBROOK             SW  17   W   54

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR SUNDAY: 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.    100    2    1300  18     80    4    2250  12
PR. GEORGE   P.G.      9    3     700  14     69    4    2250  12
SMITHERS     P.G.      9    3     500  15     49    5    2200  10
WELLS GRAY   P.G.      9    3     500  15     70    5    2050  46
FT NLSN      F.N.     23  -15     650   6     41  -12     950   9
FT STJOHN    F.N.     64    0    1250  13     54    0    1250  13

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  43   SW  46
SMITHERS              SW  37   SW  46

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR SUNDAY: POOR TO FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     73    8     700  15    100   10    3300  15
FRASER VLY   QUIL     70    8     650  15    100   11    3300  15
SRN VRISL    QUIL     31    7     300   9     82    9    3300  15
CNTRL VRISL  QUIL     38    7     300  12    100   10    3300  17
NRN VRISL    HRDY     12    5     100   4     70    7    3300  10
TERRACE      ANT       9    1     200  11     79    1    3300  11
STEWART      ANT       9    1     200  11     79    1    3330  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  33   SW  48   SW  50
PORT HARDY   S   44   S   63   SW  61
SANDSPIT     SW  39   SW  43   SW  37

TODAY'S VENTING: GOOD.


VENTING FOR SUNDAY: FAIR




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


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