FPCN39 CWLW 221344
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 WEDNESDAY 22 OCTOBER 1997 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      30   11     800  15     40   12     800  10
KAMLOOPS     KEL      20    8     700   3     17   11     850   2
OKANAGAN     KEL      12    7     600   1     17   10     800   2
CASTLEGAR    SPOK     21    7     750   5     22    9     750   5
CRANBROOK    SPOK     15    6     950   5     70   11    1800  10
REVELSTOKE   KEL       9    5     450   1     12    7     700   1

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   24   NW  41
CRANBROOK             W   17   W   46

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          850 m         13 C
SPOKANE          800 m          9 C

TODAY'S VENTING: Poor.

VENTING FOR THURSDAY: Poor.

VENTING OUTLOOK FRIDAY THRU SUNDAY: Poor to 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.     10    4     950  29    100    7    2000  31
PR. GEORGE   P.G.      9    5     700  15      9    6     700  15
SMITHERS     P.G.      9    6     500   5     15    7     650   5
WELLS GRAY   P.G.    100    6    1750  31    100    7    2150  30
FT NLSN      F.N.      9    0     400   8      9    2     400   8
FT STJOHN    F.N.     22    3     850   8     48    5    1300   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   39   W   43
SMITHERS              W   33   W   43

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       850 m         10 C
FT. NELSON       900 m          8 C

TODAY'S VENTING: Poor.

VENTING FOR THURSDAY: Poor.

VENTING OUTLOOK FRIDAY THRU SUNDAY: Poor.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     14   10     200   4     27   12     400   7
FRASER VLY   QUIL     14   10     200   4     33   13     450   7
SRN VRISL    QUIL     13   11     250   2     22   12     350   4
CNTRL VRISL  QUIL      9    9      50   0      9   10     150   0
NRN VRISL    HRDY      9    8       0   4      9   10       0   4
TERRACE      ANT      10    8     250  12     73    9     900  14
STEWART      ANT       9    7       0   3     11    9      50   3

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   22   NW  35   NW  50
PORT HARDY   W   26   W   37   W   54
SANDSPIT     W   41   W   43   W   44

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       450 m         13 C
PORT HARDY       350 m         13 C
ANNETTE          100 m         11 C

TODAY'S VENTING: Poor.

VENTING FOR THURSDAY: Poor.

VENTING OUTLOOK FRIDAY THRU SUNDAY: Fair to good.

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


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