FPCN39 CWLW 261425
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 TUESDAY 26 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   KEL      19   -1     700   2     33    1    1100   3
KAMLOOPS     KEL      14   -3     600   2     20   -2     850   2
OKANAGAN     KEL      12   -4     500   2     14   -3     600   2
CASTLEGAR    SPOK      9   -2     500   5     21   -1     750   5
CRANBROOK    SPOK      9   -5     950   6     28   -1    1300   6
REVELSTOKE   KEL      12   -4     600   2     25   -2    1050   3

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW   9   NW  19   NW  28
CRANBROOK             VR   5   N   15

TODAY'S VENTING: POOR.

VENTING FOR WEDNESDAY: 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.     10   -6     950  14     62   -5    1450  13
PR. GEORGE   P.G.     41   -6     950  14     41   -6     950  14
SMITHERS     P.G.      9  -10     500   3      9   -8     500   3
WELLS GRAY   P.G.      9  -12     400   3     41   -5     550   3
FT NLSN      F.N.      9  -14     400   4      9  -13     400   4
FT STJOHN    F.N.      9  -12     700   7      9   -9     700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  19   W   24
SMITHERS              S   48   SW  24

TODAY'S VENTING: POOR EXCEPT GOOD THIS AFTERNOON EAST OF THE FRASER.

VENTING FOR WEDNESDAY: POOR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12    3     150   4     46    5     500  11
FRASER VLY   QUIL     12    3     150   4     45    5     450  11
SRN VRISL    QUIL     13    4     200   2     42    6     550   7
CNTRL VRISL  QUIL      9    3      50   0     43    4     250   9
NRN VRISL    HRDY     15    4     150   5     45    5     750  17
TERRACE      ANT       9   -5     200   8      9   -3     200   8
STEWART      ANT       9   -2     200   6      9   -3       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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   17   W   19   NW  33
PORT HARDY   SW  19   W   33   W   46
SANDSPIT     SW  70   SW  70   SW  65

TODAY'S VENTING: POOR BECOMING FAIR OVER THE SOUTHERN REGIONS
THIS AFTERNOON.

VENTING FOR WEDNESDAY: POOR.


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


END/LEC