FPCN39 CWLW 301424
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 WEDNESDAY 30 DECEMBER 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    0     200   0      9    2     200   0
KAMLOOPS     KEL       9    1     350   0      9    3     500   0
OKANAGAN     KEL       9    2     350   0      9    4     500   0
CASTLEGAR    SPOK      9    3     500  13      9    4     500   3
CRANBROOK    SPOK      9    0     950  18      9    2     950   3
REVELSTOKE   KEL       9   -2     450   0      9    0     450   0


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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   W   43
CRANBROOK             W   11   W   35

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: 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.      8   -5    1050   5     20   -4    1050  10
PR. GEORGE   P.G.     28   -7     950   7     29   -6    1000   7
SMITHERS     P.G.      9  -10     500   1     16   -7     850   2
WELLS GRAY   P.G.      9   -8    1100   1     15   -5    1100   5
FT NLSN      F.N.      9  -26     400   0      9  -28     400   0
FT STJOHN    F.N.     28  -22    1200   4     29  -20    1300   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   28   S   19
SMITHERS              S   28   S   19

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    5     100   3     20    8     300  10
FRASER VLY   QUIL      9    6     100   3     15    9     200   5
SRN VRISL    QUIL      9    6     100   3     20    8     300  10
CNTRL VRISL  QUIL      9    5      50   2     15    7     200   5
NRN VRISL    HRDY     12    6     200   2     18    8     350   3
TERRACE      ANT       9   -5     300  15     29   -4     400  15
STEWART      ANT       9   -5     200  10     15   -4     300   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  35   S   56   SW  80
PORT HARDY   SE  61   S   80   SW  83
SANDSPIT     S   28   S   30   S   39

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: GOOD.




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


END/JDG