FPCN39 CWLW 031431
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 Tuesday 3 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       9   15     500   0     56   21    1100   6
KAMLOOPS     KEL      38   18     950   6    100   23    2150  10
OKANAGAN     KEL      19   15     650   4     88   22    1900   9
CASTLEGAR    SPOK     23   15     850   4     52   21    1100   9
CRANBROOK    SPOK      9   13     950  19     10   19     950  19
REVELSTOKE   KEL       9   12     500   0     40   18    1100   6


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   S   31   S   56
CRANBROOK             SE  15   SE  44

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1150 m         18 C
SPOKANE         1225 m         22 C

TODAY'S VENTING: BECOMING GOOD IN THE SOUTHWEST. FAIR TO POOR IN THE
SOUTHEAST.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THROUGH SATURDAY: 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.     55   14    1200  22    100   20    3950  21
PR. GEORGE   P.G.     49   15    1000  16    100   22    3700  19
SMITHERS     P.G.     42   13     850  12     70   18    1200  13
WELLS GRAY   P.G.     37   13    1150  22    100   20    4000  21
FT NLSN      F.N.     45   13    1200   6     98   22    3400   6
FT STJOHN    F.N.     51   15    1600   6     97   23    3700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  41   SE  50
SMITHERS              E   46   E   50

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1375 m         20 C
FT. NELSON       950 m         17 C

TODAY'S VENTING: GOOD THIS AFTERNOON.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THROUGH SATURDAY: GOOD IN THE AFTERNOONS.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   16     750  29    100   18    1150  31
FRASER VLY   QUIL    100   17     900  29    100   18    1100  31
SRN VRISL    QUIL     67   15     500  16    100   18    1050  25
CNTRL VRISL  QUIL     14   13     150   5     87   16     850  16
NRN VRISL    HRDY      9   15     100  14     69   16     900  14
TERRACE      ANT       9   13     200  20     69   16     800  20
STEWART      ANT      20   15     100  10     75   16     900  20


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   33   S   44   S   52
PORT HARDY   S   35   S   39   S   41
SANDSPIT     SE  37   SE  43   SE  44

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY       600 m         17 C
ANNETTE          300 m         16 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THROUGH SATURDAY: 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