FPCN39 CWLW 141331
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT FRIDAY 14 AUGUST 1998 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   25     500   0    100   35    3200   6
KAMLOOPS     KEL       9   22     500   0    100   34    3350   6
OKANAGAN     KEL       9   22     500   0    100   34    3350   6
CASTLEGAR    SPOK     16   24     750   3    100   35    3500   7
CRANBROOK    SPOK      9   20     950  11    100   32    3950   8
REVELSTOKE   KEL       9   21     500   0    100   32    3450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   19
CRANBROOK             W    9   W   19

TODAY'S VENTING: POOR THIS MORNING BECOMING GOOD THIS AFTERNOON.




VENTING FOR 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.     10   16     950  11    100   26    3950   7
PR. GEORGE   P.G.      9   15     700   1     71   23    1450  11
SMITHERS     P.G.      9   14     500   1     11   17     700   1
WELLS GRAY   P.G.      9   17    1000  11    100   25    4000   7
FT NLSN      F.N.     17   15     500   9     70   23    1400   8
FT STJOHN    F.N.      9   15     700   9    100   22    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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              SW  19   SW

TODAY'S VENTING: POOR THIS MORNING BECOMING GOOD THIS AFTERNOON
EXCEPT REMAINING POOR FOR SMITHERS.




VENTING FOR SATURDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     63   20     650  13     83   25     900  14
FRASER VLY   QUIL     64   20     650  13     91   28    1000  15
SRN VRISL    QUIL     43   18     600   7     74   25     850  11
CNTRL VRISL  QUIL     55   20     650  10     83   27     950  13
NRN VRISL    HRDY      9   16       0   7     38   18     500   7
TERRACE      ANT      10   15     250  10     68   18     900  12
STEWART      ANT      12   16     150   2     36   18     500   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   19   W   26   W   33
PORT HARDY   W   17   W   24   W   39
SANDSPIT     SW  17   SW  19   SW  24

TODAY'S VENTING: FAIR OVER THE SOUTH COAST THIS MORNING AND POOR
OVER THE NORTH COAST. VENTING BECOMING GOOD THIS AFTERNOON EXCEPT
BECOMING FAIR FOR NRN VRISL AND STEWART.




VENTING FOR SATURDAY: GOOD




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


END/JL