FPCN39 CWLW 111329
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 11 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       9   18     200   5     63   27    1600   5
KAMLOOPS     KEL       9   19     350   5     93   28    3350   5
OKANAGAN     KEL       9   18     350   5     75   27    2300   5
CASTLEGAR    SPOK     45   22    1250   4    100   29    3500  11
CRANBROOK    SPOK     50   19    1350   6    100   25    3950  13
REVELSTOKE   KEL       9   19     450   5     50   24    1450   5

*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    W    9   W   19   W   26
CRANBROOK             W   11   W   28

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   5    100   22    3950   9
PR. GEORGE   P.G.     25   16     950   6     94   22    2550   8
SMITHERS     P.G.      9   14     550   2     36   18    1000   6
WELLS GRAY   P.G.     61   17    1600  11    100   23    4000   9
FT NLSN      F.N.     29   18     750   6     68   24    1850   6
FT STJOHN    F.N.     17   17     850   6     86   23    2650   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              SW  22   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     39   16     700   6     91   21    1550   9
FRASER VLY   QUIL     52   17     850   7     93   22    1600   9
SRN VRISL    QUIL     25   15     400   4     79   20    1450   8
CNTRL VRISL  QUIL     41   17     750   5     87   21    1550   9
NRN VRISL    HRDY     17   14     300   3     84   17    1050  12
TERRACE      ANT      10   13     250  11    100   18    2100  14
STEWART      ANT      35   14     350   9     99   18    1450  12

*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  19   SW  26   SW  31
PORT HARDY   S   37   S   46   S   59
SANDSPIT     SW  31   SW  28   SW  28

VENTING FOR SUNDAY: GOOD

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


END/lm