FPCN39 CWLW 011431
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 1 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      41   17    1000   5    100   21    3200  10
KAMLOOPS     KEL      29   15     850   4    100   21    3350  10
OKANAGAN     KEL      19   14     600   4    100   21    3350  10
CASTLEGAR    SPOK     42   14     900   9    100   19    2000  20
CRANBROOK    SPOK    100   15    2150  22    100   19    3950  21
REVELSTOKE   KEL      25   14     800   4    100   18    3450  10

*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   9   SW  20   SW  31
CRANBROOK             SW  11   SW  30

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m         14 C
SPOKANE         1100 m         14 C

TODAY'S VENTING: THE AIRMASS IS QUITE UNSTABLE SO VENTING WILL BE
 GOOD BY LATE MORNING.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GENERALLY GOOD AS THE OVERALL
PATTERN REMAINS THE SAME.




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   12    2200  23    100   19    3950  22
PR. GEORGE   P.G.     95   13    1550  18    100   19    3700  20
SMITHERS     P.G.     29   12     900   6    100   18    3500  18
WELLS GRAY   P.G.    100   14    4000  22    100   20    4000  22
FT NLSN      F.N.     43   12     800  10     54   16    1150   8
FT STJOHN    F.N.     50   14    1450   7    100   18    3700  10

*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            SW  31   SW  39
SMITHERS              S   24   S   39

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         13 C
FT. NELSON      1200 m         19 C

TODAY'S VENTING: THE AIRMASS IS QUITE UNSTABLE SO VENTING WILL BE
GOOD BY LATE MORNING. HOWEVER VENTING WILL ONLY BE FAIR OVER
THE NORTHEAST.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY:  GENERALLY GOOD AS THE OVERALL
PATTERN REMAINS THE SAME.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   15    1000  20    100   18    1950  21
FRASER VLY   QUIL     82   14     700  18    100   18    1900  21
SRN VRISL    QUIL     85   15     800  16    100   18    1800  19
CNTRL VRISL  QUIL     86   15     800  16    100   17    1550  19
NRN VRISL    HRDY     23   12     250   7    100   15    1600  24
TERRACE      ANT     100   12    1200  34    100   16    2700  29
STEWART      ANT     100   13     800  29    100   16    1950  30

*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    S   31   SW  43   SW  48
PORT HARDY   S   43   S   48   SW  50
SANDSPIT     S   35   S   35   S   35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       100 m         13 C
PORT HARDY       200 m         13 C
ANNETTE          100 m         12 C

TODAY'S VENTING: THE AIRMASS IS QUITE UNSTABLE SO VENTING WILL BE
GOOD BY MID MORNING.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GENERALLY GOOD AS THE OVERALL
PATTERN REMAINS THE SAME.




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

END/JDG