FPCN39 CWLW 171340
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 17 JANUARY 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    2     200   3     45    5     600  10
KAMLOOPS     KEL      37    2     550  15     35    4     700   8
OKANAGAN     KEL      13    1     450   3     54    4    1000  10
CASTLEGAR    SPOK      9    1     500   7      9    3     500   7
CRANBROOK    SPOK     10    0     950   5     29    2    1150  10
REVELSTOKE   KEL      12    1     550   3     17    3     700   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  13   W   33   W   69
CRANBROOK             W   15   W   43

TODAY'S VENTING: Poor to fair.

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.      9   -1     950  26      9    0     950  26
PR. GEORGE   P.G.      9   -5     700  26     26   -3     750  26
SMITHERS     P.G.      9   -4     500   0      9   -2     500   0
WELLS GRAY   P.G.      9   -2    1000  26      9   -1    1000  26
FT NLSN      F.N.      9  -24     382   0      9  -22     400   3
FT STJOHN    F.N.      9  -15     695   4     15  -13     750   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   11   S   13
SMITHERS              SW  24   SW  13

TODAY'S VENTING: Poor.

VENTING FOR SUNDAY: Poor.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     20    8     200  15    100    9    1300  25
FRASER VLY   QUIL     15    6     150  10    100    7    1300  25
SRN VRISL    QUIL    100    8     750  30    100    9    1300  25
CNTRL VRISL  QUIL     92    6     750  20    100    8    1100  20
NRN VRISL    HRDY      9    2       0   6      9    0       0   6
TERRACE      ANT       9    0     200  27      9    0     200  27
STEWART      ANT       9    2       0  15      9    0       0  15

*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  30   W   35   W   50
PORT HARDY   S   19   S   22   SW  30
SANDSPIT     S   11   S   17   SW  26

TODAY'S VENTING: Good in the south. Poor in the north.

VENTING FOR SUNDAY: Fair to good.




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


END/JDG