FPCN39 CWLW 261400
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 MONDAY 26 JULY 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       9   21    1200   0    100   30    3200  20
KAMLOOPS     KEL       9   19    1150   0     82   27    3350   5
OKANAGAN     KEL       9   17     850   0     85   27    3350   8
CASTLEGAR    SPOK     22   19     850   4     84   29    3500   5
CRANBROOK    SPOK      9   16     950   7     82   26    3950   5
REVELSTOKE   KEL       9   16     850   0     55   23    1850   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  13   SW  24
CRANBROOK             W   11   W   26

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




VENTING FOR TUESDAY: 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.    100   15    2050  17    100   22    3950  17
PR. GEORGE   P.G.    100   17    1950  16    100   22    3700  17
SMITHERS     P.G.      9   14     500   1    100   20    2250  12
WELLS GRAY   P.G.     80   14    2000   5    100   22    4000  17
FT NLSN      F.N.     18   16     550   5    100   20    2250  24
FT STJOHN    F.N.     88   16    1300  21    100   21    3700  27

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   19   W   24
SMITHERS              SW  19   SW  24

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.




VENTING FOR TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     28   17     600   4     49   22     950   5
FRASER VLY   QUIL     35   18     650   5     64   26    1450   5
SRN VRISL    QUIL     22   16     550   3     42   22     900   4
CNTRL VRISL  QUIL     30   18     600   4     49   24    1100   5
NRN VRISL    HRDY     20   14     350   4     37   17     750   4
TERRACE      ANT      79   15    1250  10     93   20    1800  10
STEWART      ANT      67   15     850   9     87   20    1550   8

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S    9   S   19
PORT HARDY   VR   5   S   20   S   22
SANDSPIT     W   13   W   11   NW  15

TODAY'S VENTING: FAIR TO GOOD.




VENTING FOR TUESDAY: FAIR TO GOOD




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


END/
$$$$^^