FPCN39 CWLW 011428
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 FRIDAY 1 JANUARY 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   HRDY      9    0     200  10      9    2     200  10
KAMLOOPS     KEL       9    0     350   7      9    1     350   7
OKANAGAN     KEL       9    1     350   7     18    2     500   7
CASTLEGAR    SPOK      9    1     750   9     31    2     750   9
CRANBROOK    SPOK      9   -2     950  11      9   -1     950  11
REVELSTOKE   KEL       9   -2     450   7      9   -1     450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  19   NW  41
CRANBROOK             NW  17   N   54

TODAY'S VENTING: POOR.

VENTING FOR SATURDAY: 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   -8     950  28     10   -4     950  28
PR. GEORGE   P.G.      9   -5     700  18      9   -4     700  18
SMITHERS     P.G.      9   -5     500   1      9   -4     500   1
WELLS GRAY   P.G.      9   -5     600   1     10   -4    1000  28
FT NLSN      F.N.      9  -21     400   0      9  -21     400   0
FT STJOHN    F.N.     32  -20    1000   9     39  -16    1100   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
PR. GEORGE            W   17   W   28
SMITHERS              SW  46   SW  28

TODAY'S VENTING: POOR.

VENTING FOR SATURDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY     77    5    1050  11    100    7    1700  11
FRASER VLY   HRDY     25    4     350   6     81    6    1300   9
SRN VRISL    HRDY     44    5     700   6     85    7    1450   9
CNTRL VRISL  HRDY     12    4     200   2     91    7    1500  10
NRN VRISL    HRDY     11    4     200   2     71    6    1150   8
TERRACE      ANT      10    0     250  15     10    0     250  15
STEWART      ANT      10   -1     250  15      9    0       0   4

*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   W   13   W   41
PORT HARDY   S   50   SW  48   W   43
SANDSPIT     S   74   SW  65   SW  63

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

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


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