FPCN39 CWLW 091425
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 9 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    3     450  15     65    7    1100   8
KAMLOOPS     KEL      20    1     550   6     60    5    1100   8
OKANAGAN     KEL      28    2     650   7     62    5    1100   8
CASTLEGAR    SPOK     47    2    1200   7     69    4    1550   8
CRANBROOK    SPOK      9   -4     950  12     68    0    1600  12
REVELSTOKE   KEL      29    2     750   7     52    4    1100   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
PENTICTON    S    9   SW  31   W   63
CRANBROOK             W   17   W   52

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




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.     78    1    1200  41    100    5    1950  37
PR. GEORGE   P.G.     87    2    1150  28    100    4    1250  32
SMITHERS     P.G.      9    0     500   9     19    2     650   9
WELLS GRAY   P.G.      9  -10    1300   4    100    5    2150  35
FT NLSN      F.N.      9  -16     400   2      9  -13     400   2
FT STJOHN    F.N.      9    0     700  18      9    2     700  18

*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            SW  78   W  106
SMITHERS              SW  72   SW 106

TODAY'S VENTING: FAIR TO GOOD




VENTING FOR THURSDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     66    6     300  33    100    8     750  34
FRASER VLY   QUIL     56    6     250  28    100    8     700  34
SRN VRISL    QUIL     97    8     600  27    100   10    1000  31
CNTRL VRISL  QUIL     98    8     650  27    100    9     850  27
NRN VRISL    HRDY     33    8     150  18     51    9     250  20
TERRACE      ANT       9    3     200  27     80    5     300  27
STEWART      ANT       9    2     200  10     65    5     200  12

*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    S   44   SW  56   SW  61
PORT HARDY   S   74   S   93   SW  98
SANDSPIT     S   59   S   70   S   91

TODAY'S VENTING: FAIR TO GOOD




VENTING FOR THURSDAY: GOOD




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


END/RAM