FPCN39 CWLW 221434
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 Sunday 22 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      83   15    1600   8    100   19    2500  15
KAMLOOPS     KEL      83   14    1750   8    100   20    3350  18
OKANAGAN     KEL      83   14    1750   8    100   20    3350  18
CASTLEGAR    SPOK    100   13    1750  18    100   19    3500  19
CRANBROOK    SPOK    100   13    3950  21    100   18    3950  21
REVELSTOKE   KEL      80   13    1750   8    100   17    2650  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
PENTICTON    SW  11   W   26   W   43
CRANBROOK             SW  13   SW  33

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m         12 C
SPOKANE         1100 m         10 C

TODAY'S VENTING: good.

VENTING FOR MONDAY: good.

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     10   12     950  23    100   17    2650  24
PR. GEORGE   P.G.     61   15    1250  12    100   18    2200  18
SMITHERS     P.G.     12   14     600   3     90   18    1650  13
WELLS GRAY   P.G.    100   14    1900  23    100   18    2850  24
FT NLSN      F.N.     32   18     600  11     88   22    1950   8
FT STJOHN    F.N.      9   13     700  10     77   18    2000   8

*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            NE  37   E   44
SMITHERS              NE  26   E   44

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       none
FT. NELSON       700 m         21 C

TODAY'S VENTING: good.

VENTING FOR MONDAY: good.

VENTING OUTLOOK TUESDAY THRU THURSDAY: good.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     60   14     850   9     86   16    1450   9
FRASER VLY   QUIL     69   15    1050   9    100   18    2050   9
SRN VRISL    QUIL     46   14     650   7     92   17    1750   8
CNTRL VRISL  QUIL     48   14     700   7     72   16    1200   8
NRN VRISL    HRDY     33   13     200  17     89   15     850  17
TERRACE      ANT       9   15     200  13     77   16     850  16
STEWART      ANT      10   14      50   2     77   16     700  16

*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  30   W   37   W   35
PORT HARDY   W   35   W   35   W   30
SANDSPIT     N   26   NE  22   E   28

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       300 m         13 C
PORT HARDY       none
ANNETTE          300 m         22 C

TODAY'S VENTING: good.

VENTING FOR MONDAY: good.

VENTING OUTLOOK TUESDAY THRU THURSDAY: good.


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

END/dsl