FPCN39 CWLW 271418
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 SUNDAY 27 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   -2     600   0     16   -1     650   2
KAMLOOPS     KEL      13   -3     650   2     20   -2     700   3
OKANAGAN     KEL       9   -4     550   0     13   -3     650   2
CASTLEGAR    SPOK      9   -4     500  19      9   -4     500  19
CRANBROOK    SPOK      9  -10    1100  35      9   -7    1100  35
REVELSTOKE   KEL       9   -5     550   0     12   -4     650   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   15   W   35   W   67
CRANBROOK             W   22   W   67

TODAY'S VENTING: POOR

VENTING FOR SUNDAY: 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.     46   -7    1250  14     51   -6    1300  14
PR. GEORGE   P.G.     37   -8    1050   9     45   -6    1150   9
SMITHERS     P.G.     11   -8     650   2     41   -7     900   3
WELLS GRAY   P.G.     11   -9     600   2     49   -6    1350  14
FT NLSN      F.N.      9  -19     400   3      9  -18     400   3
FT STJOHN    F.N.      9  -22     700  10      9  -20     700  10

*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            W   46   W   65
SMITHERS              W   37   W   65

TODAY'S VENTING: POOR BECOMING FAIR THIS AFTERNOON.

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      9    4     100  14      9    5     100  14
FRASER VLY   QUIL      9    3      50  14      9    3      50  14
SRN VRISL    QUIL      9    5       0   9      9    6       0   9
CNTRL VRISL  QUIL      9    2      50   9      9    4      50   9
NRN VRISL    QUIL      9    4       0   9      9    5       0   9
TERRACE      ANT       9   -6     200   5      9   -5     200   5
STEWART      ANT       9   -7     200   5      9   -5       0   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
VANCOUVER    W   35   W   43   W   43
PORT HARDY   SW  19   W   28   W   43
SANDSPIT     W   31   W   30   W   26

TODAY'S VENTING: POOR

VENTING FOR SUNDAY: POOR

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


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