FPCN39 CWLW 071416
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 THURSDAY 7 JANUARY 1999 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    0     200   2      9    2     200   2
KAMLOOPS     KEL       9    1     350   2     21    2     600   5
OKANAGAN     KEL      21    2     600   5     24    3     700   5
CASTLEGAR    SPOK     25    2     950   4     29    3    1050   4
CRANBROOK    SPOK      9   -5     950   3      9   -4     950   3
REVELSTOKE   KEL       9    0     450   2      9   -1     450   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   13   NW  31   NW  50
CRANBROOK             W   20   NW  57

TODAY'S VENTING: GENERALLY POOR.

VENTING FOR FRIDAY: 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.     25   -5    1450   5     35   -3    1500   8
PR. GEORGE   P.G.     13  -13     900   2     13  -13     900   2
SMITHERS     P.G.     22   -7    1100   2     23   -5    1200   2
WELLS GRAY   P.G.     20   -5    1300   5     32   -4    1500   8
FT NLSN      F.N.      9  -30     400   0      9  -30     400   0
FT STJOHN    F.N.     12  -24     950   5     20  -25     900  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  26   NW  54
SMITHERS              W   30   W   54

TODAY'S VENTING: GENERALLY POOR EXCEPT RISING TO FAIR THIS AFTERNOON
IN THE WILLIAMS LAKE AREA.

VENTING FOR FRIDAY: 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   4      9    7     100   4
FRASER VLY   QUIL      9    7      50   4     26    8     350   7
SRN VRISL    QUIL      9    6       0   0     31    9     550   4
CNTRL VRISL  QUIL      9    5      50   0     13    8     200   2
NRN VRISL    HRDY     11    7     100   3     11    7     100   3
TERRACE      ANT       9   -4     200   9      9   -4     200   9
STEWART      ANT      10   -5     200   5     24   -4     300   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   35   NW  52   NW  65
PORT HARDY   W   31   NW  43   NW  70
SANDSPIT     W   26   W   41   W   61

TODAY'S VENTING: GENERALLY POOR.

VENTING FOR FRIDAY: POOR

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

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