FPCN39 CWLW 181322
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 SATURDAY 18 JULY 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      15   22     500   2     95   32    2400   7
KAMLOOPS     KEL      13   22     550   2    100   34    3350   8
OKANAGAN     KEL      14   23     600   2    100   35    3350   8
CASTLEGAR    SPOK     35   23     800  10    100   35    3500  10
CRANBROOK    SPOK      9   20     950   6    100   32    3950  11
REVELSTOKE   KEL      10   20     500   2     93   30    2450   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W    9   SW  17
CRANBROOK             VR   5   W   17

VENTING FOR SUNDAY: 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   3    100   26    3950  10
PR. GEORGE   P.G.     11   15     900   1    100   24    3700   8
SMITHERS     P.G.     12   14     850   1     59   23    1950   5
WELLS GRAY   P.G.      9   16    1000   3    100   26    4000  10
FT NLSN      F.N.      9   15     400  29    100   21    2500  15
FT STJOHN    F.N.      9   14     700  34    100   23    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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              S   19   S

VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     27   19     800   3     45   24    1350   3
FRASER VLY   QUIL     28   20     900   3     53   27    1700   3
SRN VRISL    QUIL     26   17     650   3     49   24    1300   4
CNTRL VRISL  QUIL     27   18     650   3     51   25    1400   4
NRN VRISL    HRDY     19   14     250   4     26   18     450   4
TERRACE      ANT       9   13     200   5    100   20    1750  12
STEWART      ANT      11   15     150   2     97   20    1600  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  11   SW  11   SW  24
PORT HARDY   S   26   S   41   S   48
SANDSPIT     S   43   S   43   S   46

VENTING FOR SUNDAY: GOOD

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

END/