FPCN39 CWLW 101400
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 PDT SATURDAY 10 APRIL 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      18    5     600   2     57   12    3200   2

KAMLOOPS     KEL      22    5    1000   2     57   12    3350   2

OKANAGAN     KEL      14    3     600   2     57   12    3350   2

CASTLEGAR    SPOK     40    5    1050   6    100   12    3500   9

CRANBROOK    SPOK      9    1     950   9    100    8    3950  10

REVELSTOKE   KEL      20    4    1000   2     57   10    3450   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    SE   9   SE  19   SE  28
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: POOR THIS MORNING. GOOD THIS AFTERNOON.




VENTING FOR SUNDAY: FAIR TO 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.     47    2    1300  12    100   10    3950  13

PR. GEORGE   P.G.     34    1    1000   9    100    8    3700  12

SMITHERS     P.G.     21    0     800   4    100    7    2700  10

WELLS GRAY   P.G.     ##   ##     ###  ##    100   10    4000  13

FT NLSN      F.N.      9   -2     700   0    100    5    3400  11

FT STJOHN    F.N.     71    0    1950   7    100    6    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   13   SW  17
SMITHERS              S   19   SW  17

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.




VENTING FOR SUNDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    8    1000  28    100   11    1650  30

FRASER VLY   QUIL     88    7     650  24    100   11    1600  30

SRN VRISL    QUIL    100    8     800  22    100   11    1550  28

CNTRL VRISL  QUIL    100    8     850  22    100   11    1550  28

NRN VRISL    HRDY     95    7     700  23    100   10    1500  22

TERRACE      ANT       9    3     250   9     97    8    1800  10

STEWART      ANT      11    5     100   3     85    8    1300  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
VANCOUVER    SE  24   SE  37   SE  43
PORT HARDY   SE  24   SE  30   SE  28
SANDSPIT     S   37   S   41   S   43

TODAY'S VENTING: GOOD EXCEPT POOR THIS MORNING NORTH COAST.




VENTING FOR SUNDAY: FAIR TO GOOD.




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


END/
$$$$^^