FPCN39 CWLW 151400
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 SUNDAY 15 AUGUST 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   P.G.      9   17     200   1     80   22    1550   8
KAMLOOPS     P.G.      9   17     350   1    100   24    2650   8
OKANAGAN     P.G.      9   16     350   1     89   22    2150   8
CASTLEGAR    P.G.     18   16     850   3     84   20    2050   8
CRANBROOK    P.G.     86   15    1800  15    100   19    2850  12
REVELSTOKE   P.G.      9   15     450   1     38   18    1150   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   15   SW  19
CRANBROOK             W   13   W   31

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR MONDAY: 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.     86   15    1800  15    100   20    3950  12
PR. GEORGE   P.G.     17   14     800   6     94   19    2250  10
SMITHERS     P.G.      9   13     500   1     38   17    1200   8
WELLS GRAY   P.G.     86   15    1800  15    100   20    4000  12
FT NLSN      F.N.      9   16     400   0     93   26    2400   7
FT STJOHN    F.N.      9   13     700  10     52   20    1250   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
PR. GEORGE            SW  17   S   24
SMITHERS              S   15   S   24

TODAY'S VENTING: GOOD OCCASIONALLY FAIR

VENTING FOR MONDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     93   16     800  21    100   18    1250  20
FRASER VLY   QUIL    100   17    1100  20    100   19    1400  20
SRN VRISL    QUIL     94   17     950  16    100   19    1350  17
CNTRL VRISL  QUIL     69   16     700  13    100   19    1350  17
NRN VRISL    HRDY      9   13       0   7     68   16     650  13
TERRACE      ANT      52   13     550  17    100   17    1450  18
STEWART      ANT       9   13       0   6     81   17    1000  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   19   SW  26   SW  31
PORT HARDY   S   22   SW  24   SW  24
SANDSPIT     SW  15   SW  13   VR   5

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

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


END/MWSO
$$$$^^