FPCN39 CWLW 211422
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 21 FEBRUARY 1999 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      27    4     550   5     84    6    1750   5
KAMLOOPS     KEL      28    5     750   5     87    8    1900  10
OKANAGAN     KEL      23    3     650   5     75    6    1700  10
CASTLEGAR    SPOK      9    3     500  10     75    5    1500  10
CRANBROOK    SPOK     10   -1     950  23     90    3    1600  16
REVELSTOKE   KEL      13    1     550   5     75    3    1400   5

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   S   22   SW  50
CRANBROOK             SW  19   SW  48

TODAY'S VENTING: POOR THIS MORNING BECOMING GOOD IN THE AFTERNOON.


VENTING FOR MONDAY: 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.    100    3    1850  29    100    5    3950  22
PR. GEORGE   P.G.     58    4    1000  21    100    5    1300  15
SMITHERS     P.G.      9   -1     500   3     80    3    1300   9
WELLS GRAY   P.G.    100    2    1800  30    100    5    4000  25
FT NLSN      F.N.     10  -10     450   1     10   -6     500   1
FT STJOHN    F.N.      9   -5     700  14     52   -2    1050  15

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   31   SW  35
SMITHERS              S   19   SW  35

TODAY'S VENTING: GOOD IN THE CENTRAL INTERIOR. FAIR TO POOR IN
THE NORTHEAST.


VENTING FOR MONDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    9    1450  53    100   11    2050  54
FRASER VLY   QUIL    100    8     950  51    100   10    1700  53
SRN VRISL    QUIL    100    9    1250  47    100   11    1850  50
CNTRL VRISL  QUIL    100    9    1300  47    100   11    1900  50
NRN VRISL    HRDY    100    7     700  27    100    9    1050  27
TERRACE      ANT      40    0     500  10     90    2    1000  10
STEWART      ANT      40    0     500   7     90    2    1000   7

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  41   SW  56   W   57
PORT HARDY   S   26   SW  31   SW  30
SANDSPIT     S   22   S   28   S   30

TODAY'S VENTING: GOOD


VENTING FOR MONDAY: GOOD


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


END/GF