FPCN39 CWLW 021424
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 SATURDAY 2 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   -1     200   2     15    1     500   2
KAMLOOPS     KEL       9   -3     350   2     13    0     550   2
OKANAGAN     KEL       9   -2     350   2     39    2     900   6
CASTLEGAR    SPOK      9   -2     500   4     21    1     800   4
CRANBROOK    SPOK      9   -8     950   6      9   -4     950   6
REVELSTOKE   KEL       9   -6     450   2      9   -3     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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  11   NW  30
CRANBROOK             NW  11   N   41

TODAY'S VENTING: POOR BECOMING FAIR IN SOME VALLEYS THIS AFTERNOON.

VENTING FOR SUNDAY: 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   -6     950  23     73   -1    1350  23
PR. GEORGE   P.G.     61   -3    1050  19     68   -2    1100  19
SMITHERS     P.G.     21   -3     750   6     29   -2     900   6
WELLS GRAY   P.G.     21   -4     700   5     55   -3    1250  23
FT NLSN      F.N.      9  -25     400   1     61  -20     900  13
FT STJOHN    F.N.     75  -18    1200  19     85  -14    1350  20

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   41   W   44
SMITHERS              SW  56   W   44

TODAY'S VENTING: POOR THIS MORNING IN SOME VALLEYS BECOMING GOOD
THIS AFTERNOON.

VENTING FOR SUNDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    3     100   8     30    7     350   9
FRASER VLY   QUIL      9    3      50   8     30    7     300   9
SRN VRISL    QUIL      9    4     150   0     30    8     400   6
CNTRL VRISL  QUIL      9    4     150   0     20    7     300   4
NRN VRISL    HRDY     36    6     400   8     42    7     450   8
TERRACE      ANT       9    0     200   8      9    0     200  20
STEWART      ANT       9    0     200   8      9    0     100  18

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   15   N   11   N   28
PORT HARDY   VR   5   VR   5   W   15
SANDSPIT     SW  43   SW  39   SW  39

TODAY'S VENTING: POOR BECOMING FAIR NORTHERN VRISL.

VENTING FOR SUNDAY: FAIR.

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


END/LEC