FPCN39 CWLW 171432
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 17 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      21   20     600   3     55   24    1400   5
KAMLOOPS     KEL      26   20     850   4     66   24    1700   6
OKANAGAN     KEL      20   19     600   4     66   24    1700   6
CASTLEGAR    SPOK      9   18     700   4     93   24    1750  12
CRANBROOK    SPOK      9   16     1200  4    100   23    2450  21
REVELSTOKE   KEL       9   16     450   3     23   19     850   4

*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    SW  11   SW  24   SW  37
CRANBROOK             SW  17   SW  46

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m         19 C
SPOKANE          800 m         19 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: 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.    100   15    2100  32    100   19    3950  30
PR. GEORGE   P.G.     10   15     700  18    100   19    2600  29
SMITHERS     P.G.      9   13     500   5     86   17    1350  15
WELLS GRAY   P.G.    100   17    2850  30    100   20    4000  30
FT NLSN      F.N.     86   17    1700  10    100   23    3400   9
FT STJOHN    F.N.     85   15    1950  10    100   20    3700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  28   SW  35
SMITHERS              S   22   S   35

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       700 m         14 C
FT. NELSON       700 m         13 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     68   17     500  21     91   18     650  25
FRASER VLY   QUIL     66   17     450  21     90   18     600  25
SRN VRISL    QUIL     30   16     200  13     94   19     750  22
CNTRL VRISL  QUIL     30   16     200  13     94   19     750  22
NRN VRISL    HRDY     30   16     200  13     94   19     750  22
TERRACE      ANT      86   13     650  29    100   17    1650  31
STEWART      ANT      91   15     600  23    100   17    1000  27

*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    SW  35   SW  46   SW  54
PORT HARDY   S   43   S   50   S   56
SANDSPIT     S   30   S   30   S   33

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       none.
PORT HARDY       300 m         17 C
ANNETTE          100 m         15 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD.


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

END/DSL