FPCN39 CWLW 261327
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 26 SEPTEMBER 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      12   14     650   1     87   22    2500   6
KAMLOOPS     KEL       9   12     600   0    100   22    3350   6
OKANAGAN     KEL       9   12     600   0     79   20    2400   5
CASTLEGAR    SPOK     19   13     800   4     87   18    1900   9
CRANBROOK    SPOK      9   10     950  12     94   16    2750   8
REVELSTOKE   KEL       9   11     600   0     64   18    2100   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  15   N   26
CRANBROOK             NW  13   NW  33

TODAY'S VENTING: GOOD




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    7     950  19    100   17    2600  20
PR. GEORGE   P.G.     18    8     850   5     98   16    1950  13
SMITHERS     P.G.     22    8     800   5     74   16    1450  11
WELLS GRAY   P.G.      9    8    1000  19    100   17    2650  20
FT NLSN      F.N.     33    8     550  17     71   16     900  17
FT STJOHN    F.N.      9    8     700  19    100   16    2100  21

*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              W   33   W

TODAY'S VENTING: GOOD




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     14   13     200   5     60   19     500  13
FRASER VLY   QUIL     19   15     250   5    100   24    1900  17
SRN VRISL    QUIL     13   12     150   3     56   20     500   8
CNTRL VRISL  QUIL     13   14     200   3    100   23    1800  15
NRN VRISL    HRDY     14   12     150   4     55   18     750   6
TERRACE      ANT      ##   ##     ###  ##     62   19    1300   7
STEWART      ANT      18   13     300   3     63   19    1250   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
VANCOUVER    NW  13   N   19   N   30
PORT HARDY   N   20   N   31   N   39
SANDSPIT     W   24   NW  43   W   52

TODAY'S VENTING: GOOD




VENTING FOR SUNDAY: GOOD




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


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