FPCN39 CWLW 241323
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 THURSDAY 24 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       9   14     200   0     45   22     850  15
KAMLOOPS     KEL       9   15     450   0     22   22    1200   2
OKANAGAN     KEL       9   13     350   0     22   22    1200   2
CASTLEGAR    SPOK     29   15     800   7     60   23    1300   8
CRANBROOK    SPOK      9   12     950  10    100   22    2750  16
REVELSTOKE   KEL       9   14     450   0      9   18     550   0

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   30
CRANBROOK             W   13   W   28

TODAY'S VENTING: POOR.

VENTING FOR FRIDAY: FAIR.

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.     25    8    1550  10     70   15    3950   4
PR. GEORGE   P.G.      9   10     700   1     55   14    1750   4
SMITHERS     P.G.      9    9     550   1     40   14     950   8
WELLS GRAY   P.G.     10    5    2150  11     80   12    4000  14
FT NLSN      F.N.     19    9     550   6     39   12    1000   5
FT STJOHN    F.N.     25    9    1050   5     39   12    1900   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              W   39   W

TODAY'S VENTING:  FAIR.

VENTING FOR FRIDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     47   15     700   7     35   19     850   5
FRASER VLY   QUIL     50   16     750   7     45   22    1100   5
SRN VRISL    QUIL     18   14     350   3     40   20     850   5
CNTRL VRISL  QUIL     19   14     350   3     50   21     900   5
NRN VRISL    HRDY     40   13     550   7     65   15     900  10
TERRACE      ANT      10   12     250  18     65   15    1100  12
STEWART      ANT      50   13     450  12     55   15     750  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   19   W   31   W   39
PORT HARDY   NW  35   NW  41   NW  46
SANDSPIT     NW  39   NW  54   NW  61

TODAY'S VENTING: FAIR.

VENTING FOR FRIDAY: FAIR.

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

END/KJ