FPCN39 CWLW 021441
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 2 DECEMBER 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    3     200   2      9    5     200   2
KAMLOOPS     KEL      12    4     500   2     57    7     950  10
OKANAGAN     KEL       9    3     350   2     35    6     700   9
CASTLEGAR    SPOK      9    3     500  22      9    5     500  22
CRANBROOK    SPOK      9    1     950  46     11    2     950  46
REVELSTOKE   KEL       9    1     450   2     10    3     500   2

*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    SW   9   W   26   W   61
CRANBROOK             W   22   W   59

TODAY'S VENTING: POOR RISING TO FAIR AT KAMLOOPS AND IN THE OKANGAN.

VENTING FOR THURSDAY: POOR


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   -1     950  10     57    2    1550  10
PR. GEORGE   P.G.      9   -3     700   3     12    0     750   3
SMITHERS     P.G.      9   -6     550   3     15   -2     700   3
WELLS GRAY   P.G.      9   -2    1000  10     46    1    1450  10
FT NLSN      F.N.      9  -20     400   5     16  -18     500   5
FT STJOHN    F.N.     10  -10     900   5     20   -8     950  10

*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  41   SW  46
SMITHERS              S   37   SW  46

TODAY'S VENTING: POOR RISING TO FAIR AT WILLIAMS LAKE AND WELLS GRAY.

VENTING FOR THURSDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    6     100  21    100    9    1000  22
FRASER VLY   QUIL      9    6      50  21     71    8     500  21
SRN VRISL    QUIL     11    6      50   4    100   10    1350  20
CNTRL VRISL  QUIL      9    0      50   4      9    0      50   4
NRN VRISL    HRDY     ##   ##     ###  ##     ##   ##     ###  ##
TERRACE      ANT       9    0     200  18      9    2     200  18
STEWART      ANT       9    2       0  11      9    2       0  11

*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    SW  37   W   54   W   57
PORT HARDY   SW  54   SW  65   W   63
SANDSPIT     W   50   W   50   W   46

TODAY'S VENTING: POOR EXCEPT RISING TO GOOD IN THE SOUTHWEST.

VENTING FOR THURSDAY: POOR




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


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