FPCN39 CWLW 261347
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 26 SEPTEMBER 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      80    9    1200   5    100   15    3200  10
KAMLOOPS     KEL      60    8    1350   5    100   15    3350  10
OKANAGAN     KEL      60    9    1350   5    100   14    3350   9
CASTLEGAR    SPOK     80    8    1500   5    100   14    2100   6
CRANBROOK    SPOK     80    6    1250   4    100   13    3950   8
REVELSTOKE   KEL      80    7    1450   3     86   11    1700   4

*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   NW  19   NW  28
CRANBROOK             NW   9   NW  19

TODAY'S VENTING:good.

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.    100    8    1950  16    100   10    3950   6
PR. GEORGE   P.G.    100    6    1700  16    100    9    3700   6
SMITHERS     P.G.    100    7    1500  13    100   10    3500   3
WELLS GRAY   P.G.    100    3    2000  15    100   10    4000   6
FT NLSN      F.N.      9    6     750   4    100   10    4000   7
FT STJOHN    F.N.    100    8    1700   8    100   10    2400  13

*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            W   30   W   37
SMITHERS              W   35   W   37

TODAY'S VENTING:good


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    100   13    3100  23    100   16    1750  13
FRASER VLY   QUIL    100   13    3050  23    100   16    1700  13
SRN VRISL    QUIL    100   11    2850  21    100   16    1600   9
CNTRL VRISL  QUIL    100   11    2850  21    100   16    1650   9
NRN VRISL    HRDY    100    9    3000  16    100   14    1600   7
TERRACE      ANT     100    9    3200  13     87   11    1800   8
STEWART      ANT     100    8    3000  12     51   11     950   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   19   NW  22   NW  31
PORT HARDY   NW  20   NW  30   NW  39
SANDSPIT     W   28   W   35   NW  50

TODAY'S VENTING:good




VENTING FOR MONDAY: GOOD except fair inland on the north coast.




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

END/lm