FPCN39 CWLW 161331
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 16 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      49    7     950   6     49    7     950   6
KAMLOOPS     KEL      25    4     650   6     53    7    1250   7
OKANAGAN     KEL      25    4     650   6     47    6    1050   6
CASTLEGAR    SPOK     23    3     800   5     30    5     950   5
CRANBROOK    SPOK      9    1     950   4     53    4    1250  10
REVELSTOKE   KEL      20    3     650   6     30    4     850   6

*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    SW  13   W   46   W   87
CRANBROOK             W   26   W   87

TODAY'S VENTING: FAIR.

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.      9    1     500   3     15    2     750   3
PR. GEORGE   P.G.      9    1     500   3     15    2     750   3
SMITHERS     P.G.      9    1     500   3     15    2     750   3
WELLS GRAY   P.G.      9    1     500   3     15    2     750   3
FT NLSN      F.N.      9  -16     400   0      9  -14     400   0
FT STJOHN    F.N.      9    1     700  21      9    1     700  21

*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            W   80   W  104
SMITHERS              W   52   W  104

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: FAIR TO POOR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    3     100   9      9    0     100   9
FRASER VLY   QUIL      9    2      50   9      9    0      50   9
SRN VRISL    QUIL      9    4       0   4      9    0       0   4
CNTRL VRISL  QUIL      9    3      50   4      9    0      50   4
NRN VRISL    HRDY      9    4       0   8      9    0       0   8
TERRACE      ANT      10    0     250  19     10    0     250  19
STEWART      ANT      10    0     250  19      9    0       0  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  37   W   59   W   74
PORT HARDY   SW  61   SW  82   W   94
SANDSPIT     W   41   W   56   W   78

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: POOR.


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


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