FPCN39 CWLW 111429
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 PST WEDNESDAY 11 NOVEMBER 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    2     200   1     12    7     500   1
KAMLOOPS     KEL       9    2     350   1     50    7    1400   5
OKANAGAN     KEL       9    4     350   1     50    7    1400   5
CASTLEGAR    SPOK     21    3     800   4     24    5     900   4
CRANBROOK    SPOK      9   -1     950  11     51    3    1400  11
REVELSTOKE   KEL       9    2     450   1      9    4     500   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   26   NW  52
CRANBROOK             W   19   W   50

TODAY'S VENTING: FAIR

VENTING FOR THURSDAY: 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.      9   -2     950  16    100    2    2650  19
PR. GEORGE   P.G.      9   -3     700   2     18   -1     900   5
SMITHERS     P.G.     12   -3     700   2     24    0     850   5
WELLS GRAY   P.G.     29   -2    1150  16    100    1    2650  19
FT NLSN      F.N.     39  -11     750   9     38   -8     900   8
FT STJOHN    F.N.     64   -9    1550   8     55   -6    1400  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  31   W   41
SMITHERS              SW  48   W   41

TODAY'S VENTING: POOR BECOMING GOOD ABOVE 1200 METRES.

VENTING FOR THURSDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    6     200   2     19   10     500   3
FRASER VLY   QUIL     12    6     200   2     19   10     450   3
SRN VRISL    QUIL     11    5     150   2     17   10     350   2
CNTRL VRISL  QUIL     12    6     200   2     14    9     300   2
NRN VRISL    HRDY      9    4       0   1     12    8     300   1
TERRACE      ANT       9    0     200  11     10    2     250  11
STEWART      ANT       9    1       0   5      9    2       0   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   W   22   W   35
PORT HARDY   SW  30   SW  41   SW  43
SANDSPIT     W   33   W   41   SW  50

TODAY'S VENTING: POOR

VENTING FOR THURSDAY: FAIR

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

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