FPCN39 CWLW 081431
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 8 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      26   16     650   4    100   23    3200   9
KAMLOOPS     KEL      91   16    2000   9    100   24    3350   9
OKANAGAN     KEL      97   17    2300   8    100   24    3350   9
CASTLEGAR    SPOK     51   17     950  11    100   24    3500  12
CRANBROOK    SPOK     78   16    1750  13    100   22    3950  12
REVELSTOKE   KEL      95   16    2250   8    100   23    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW   9   NW   9
CRANBROOK             VR   5   W    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          750 m         14 C
SPOKANE         1300 m         18 C

TODAY'S VENTING: THE AIRMASS REMAINS UNSTABLE ENOUGH AT LOW LEVELS
THAT THE VENTING WILL BECOME GOOD BY LATE MORNING.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: REMAINING 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   12    3950  10    100   18    3950  10
PR. GEORGE   P.G.    100   12    3700   9    100   17    3700   9
SMITHERS     P.G.     29   11     950   5    100   16    3500   9
WELLS GRAY   P.G.    100   12    4000  10    100   18    4000  10
FT NLSN      F.N.     70   15    1000  13    100   21    3400   8
FT STJOHN    F.N.     65   13    1350  12    100   18    3700   7

*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            W   24   W   28
SMITHERS              W   19   W   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       900 m         12 C
FT. NELSON      1600 m         19 C

TODAY'S VENTING: THE AIRMASS REMAINS UNSTABLE. VENTING WILL BECOME
GOOD BY THE AFTERNOON.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: REMAINING GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   15    1550  13    100   19    2100  12
FRASER VLY   QUIL    100   16    1750  13    100   22    2450  11
SRN VRISL    QUIL      9   14    1100   0     97   19    2050   8
CNTRL VRISL  QUIL     50   11     550  10    100   15    2000  10
NRN VRISL    HRDY     53   12     550  10    100   15    2000  10
TERRACE      ANT      68   12    1650   6     91   17    3200   5
STEWART      ANT      70   13    1350   6     88   17    2300   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   15   NW  13   NW  15
PORT HARDY   W   15   W   13   W   19
SANDSPIT     W   19   W   15   SW  20

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       150 m         11 C
PORT HARDY       550 m         12 C
ANNETTE         NONE m         ## C

TODAY'S VENTING: THE AIRMASS REMAINS UNSTABLE ENOUGH AT LOW LEVELS
THAT THE VENTING WILL BECOME BY AFTERNOON. IN THE NORTH THE VENTING
IS GOOD ALL DAY.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: REMAINING GOOD.




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

END/JDG