FPCN39 CWLW 181514 AAA
REVISED
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 18 JUNE 1999 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      30   20     500  18    100   23    3000  25
KAMLOOPS     KEL      13   20     550   2    100   25    3000   3
OKANAGAN     KEL      15   19     500   2    100   24    3000   8
CASTLEGAR    SPOK     20   16     400   2    100   22    3000   4
CRANBROOK    SPOK      9   17     950   5    100   21    3000   5
REVELSTOKE   KEL      11   18     500   2    100   22    3000   2

*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    W   11   SW  20   SW  26
CRANBROOK             VR   5   SW  24

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: FAIR TO 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.      9   15     950  10    100   19    3000  10
PR. GEORGE   P.G.      9   15     700   8    100   18    3000   9
SMITHERS     P.G.      9   14     500   3     80   17    3000   6
WELLS GRAY   P.G.      8    9    1100   8     90   19    3000  10
FT NLSN      F.N.     25   21     650   6    100   26    3000  11
FT STJOHN    F.N.      9   17     700  10    100   20    3000  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  11   S   20
SMITHERS              W   15   SW  20

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.


VENTING FOR SATURDAY: FAIR TO GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     30   16     300   8    100   19    3000  12
FRASER VLY   QUIL     34   16     500   6    100   19    3000  10
SRN VRISL    QUIL     38   15     400   4    100   18    3000  12
CNTRL VRISL  QUIL     40   17     650   6    100   19    3000  11
NRN VRISL    HRDY     23   13     450   3     47   15    1500   6
TERRACE      ANT       8   11     400   2    100   17    1900  12
STEWART      ANT      69   13     800  11    100   17    1500  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  20   W   31   SW  33
PORT HARDY   SW  15   SW  19   SW  24
SANDSPIT     S   17   S   20   S   26

TODAY'S VENTING: RISING TO GOOD THIS AFTERNOON.


VENTING FOR SATURDAY: FAIR TO GOOD.




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


END/TCS