FPCN39 CWLW 031434
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 THURSDAY 3 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      30    4     500  15    100    6    2000  15
KAMLOOPS     KEL       9    1     500   0     80    5    2050   5
OKANAGAN     KEL       9    1     500   0     80    6    2050   5
CASTLEGAR    SPOK     35    3     950  10     89    6    1800  10
CRANBROOK    SPOK     21    1    1100  13     80    3    1700  13
REVELSTOKE   KEL       9    3     550   0     11    4     650   1

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PENTICTON    VR   5   SW  15   SW  31
CRANBROOK             W    9   W   24

TODAY'S VENTING: BECOMING GENERALLY GOOD THIS AFTERNOON.

VENTING FOR FRIDAY: 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.     10   -3     950   5     80    1    1850  10
PR. GEORGE   P.G.      9   -5     700   0     19   -2     900   3
SMITHERS     P.G.      9   -5     550   0     60   -4    1850   5
WELLS GRAY   P.G.     10   -5    1050   5     60    1    1600  10
FT NLSN      F.N.      9  -14     400   0      9  -14     400   0
FT STJOHN    F.N.      9   -9     700   3      9   -8     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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PR. GEORGE            S   22   S   17
SMITHERS              E   15   VR  17

TODAY'S VENTING: POOR EXCEPT GOOD BRIEFLY THIS AFTERNOON MAINLY IN
THE WEST.

VENTING FOR FRIDAY: POOR TO FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     53    6     600  11    100    9    1750  17
FRASER VLY   QUIL     42    5     400  11     99    8    1200  15
SRN VRISL    QUIL     43    6     500   8    100    9    1500  15
CNTRL VRISL  QUIL     59    7     650  10     87    8    1050  13
NRN VRISL    HRDY     18    4     250   4     74    7     950  10
TERRACE      ANT       9    0     200  23     80    1    1000  23
STEWART      ANT       9    0     200  10     29    1     300  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    SW  31   SW  37   SW  31
PORT HARDY   W   11   W   15   W   17
SANDSPIT     N   30   N   30   N   31

TODAY'S VENTING: GOOD EXCEPT POOR IN THE EXTREME NORTH.

VENTING FOR FRIDAY: FAIR




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


END/MWSO