FPCN39 CWLW 261429
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 THURSDAY 26 NOVEMBER 1998 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    6     200   2     60    9    1400   2
KAMLOOPS     KEL       9    6     350   2     65   10    1200   2
OKANAGAN     KEL       9    7     350   2     60    9    1400   2
CASTLEGAR    SPOK      9    6     500  10     60    8    1000  10
CRANBROOK    SPOK      9    5     950   5     45    7    1000   5
REVELSTOKE   KEL       9    5     450   2     55    7     900   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   SW  30   SW  69
CRANBROOK             W   22   W   63

TODAY'S VENTING: GENERALLY GOOD EXCEPT FAIR IN THE SOUTHEAST CORNER
OF THE PROVINCE.




VENTING FOR FRIDAY: 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.      9    1     950  10     80    7    2750   12
PR. GEORGE   P.G.      9    2     700   3     65    6     900   5
SMITHERS     P.G.      9    1     500   3     55    4     850   5
WELLS GRAY   P.G.     10    3    1000  19     80    7    3000  12
FT NLSN      F.N.     33  -10     600  12     30   -9     750  12
FT STJOHN    F.N.     66   -7    1150  17     75   -4    1200  18



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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  52   SW  67
SMITHERS              SW  48   SW  67

TODAY'S VENTING: GENERALLY GOOD EXCEPT FAIR EAST OF THE ROCKIES.




VENTING FOR FRIDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    9     100  26     80   11    1000  15
FRASER VLY   QUIL     11    8      50  26     75   10    1000  15
SRN VRISL    QUIL      9    7       0   5     73   11     800  16
CNTRL VRISL  QUIL      9    6      50   5     70    9     700   7
NRN VRISL    HRDY      9    7       0  15     87    9     800  17
TERRACE      ANT       9    1     200   5     50    3     500  10
STEWART      ANT       9    4       0   2     50    3     400  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  46   SW  67   SW  67
PORT HARDY   W   30   W   39   SW  43
SANDSPIT     W   52   W   52   SW  54

TODAY'S VENTING: GENERALLY GOOD EXCEPT FAIR ALONG THE NORTH COAST.




VENTING FOR FRIDAY: FAIR



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


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