FPCN39 CWLW 041433
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Wednesday 4 June 1997 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      17   17     600   2     57   20    1650   2
KAMLOOPS     KEL      18   17     800   2     59   21    2300   3
OKANAGAN     KEL      18   17     800   2     59   21    2300   3
CASTLEGAR    SPOK      9   14     500   0     56   17    1800   6
CRANBROOK    SPOK      9   13     950  10    100   16    3950  13
REVELSTOKE   KEL      11   14     550   2     61   17    1550   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   SW  15
CRANBROOK             W    9   W   24

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1050 m         17 C
SPOKANE         1400 m         18 C

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: FAIR

VENTING OUTLOOK FRIDAY THROUGH SUNDAY: GOOD IN THE AFTERNOONS.


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   14    1800  26    100   18    3950  24
PR. GEORGE   P.G.     43   14    1000  12    100   18    2150  22
SMITHERS     P.G.     21   14     750   6    100   18    1750  17
WELLS GRAY   P.G.    100   14    1950  26    100   18    4000  24
FT NLSN      F.N.     31   17     500  22    100   20    1150  25
FT STJOHN    F.N.     89   19    1200  26    100   23    3700  25


*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  17   SW  26
SMITHERS              VR   5   S   26

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       750 m         14 C
FT. NELSON      1175 m         20 C

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: FAIR

VENTING OUTLOOK FRIDAY THROUGH SUNDAY: GOOD IN THE AFTERNOON.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     93   15     900  18    100   18    1950  18
FRASER VLY   QUIL     87   15     850  17    100   18    1900  18
SRN VRISL    QUIL     41   14     350  11    100   17    1550  17
CNTRL VRISL  QUIL     41   14     350  11     72   15     700  14
NRN VRISL    HRDY     39   13     150   9     55   15     450  14
TERRACE      ANT      90   14    1250  14    100   18    2000  13
STEWART      ANT      81   14     900  13    100   18    1600  13


*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    SW  22   SW  26   SW  31
PORT HARDY   S   28   S   31   S   35
SANDSPIT     S   30   S   30   S   33

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY       250 m         14 C
ANNETTE         NO INVERSION

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR THURSDAY: FAIR

VENTING OUTLOOK FRIDAY THROUGH SUNDAY: GOOD IN THE AFTERNOONS.

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

END/PLJ