FPCN39 CWLW 011400
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 1 MAY 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       9   13     200   2     34   17    1400   2

KAMLOOPS     KEL      12   13     500   2     38   16    2000   2

OKANAGAN     KEL      12   13     500   2     38   16    1950   2

CASTLEGAR    SPOK     18   11     750   4     66   15    1050  14

CRANBROOK    SPOK      9    8     950  21    100   15    2800  16

REVELSTOKE   KEL       9    9     450   2     10   12     500   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    W   13   W   24   W   39
CRANBROOK             SW  13   SW  39

TODAY'S VENTING: FAIR TO GOOD EXCEPT POOR NEAR REVELSTOKE.




VENTING FOR SUNDAY: 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.     50    9    1400  11    100   14    3950  10

PR. GEORGE   P.G.      9    9     700   4     92   14    2500   8

SMITHERS     P.G.      9    5     500   0     45   13    1400   5

WELLS GRAY   P.G.     ##   ##     ###  ##    100   14    4000  10

FT NLSN      F.N.     11    9     550   1     80   16    1650   9

FT STJOHN    F.N.      9    9     700  10     98   14    2650   9


*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            W   19   SW  30
SMITHERS              SW  30   SW  30

TODAY'S VENTING: FAIR TO GOOD.




VENTING FOR SUNDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   11    1250  19    100   14    2000  20

FRASER VLY   QUIL    100   11    1250  19    100   13    1400  19

SRN VRISL    QUIL    100   11    1150  17    100   13    1400  17

CNTRL VRISL  QUIL    100   11    1200  17    100   14    1500  18

NRN VRISL    HRDY     34    9     950   3     56   12    1550   4

TERRACE      ANT      79    7    1050  13    100   10    1900  15

STEWART      ANT      63    8     800   9     92   10    1300  11


*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    SW  26   SW  28   W   26
PORT HARDY   SW  22   SW  26   SW  28
SANDSPIT     SW  37   SW  39   W   39

TODAY'S VENTING: GOOD.




VENTING FOR SUNDAY: FAIR




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


END/TCS
$$$$^^