FPCN39 CWLW 031428
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 SUNDAY 3 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   -3     200   0     22    1     800   2
KAMLOOPS     KEL       9   -3     500   0     24    0     900   3
OKANAGAN     KEL      17   -1     750   2     27    1    1050   3
CASTLEGAR    SPOK     22   -3     850   4     24   -1     900   4
CRANBROOK    SPOK      9  -12     950   3      9   -6     950   3
REVELSTOKE   KEL       9   -5     450   0     13   -3     600   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   NW  26
CRANBROOK             NW  13   NW  39

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: 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   -4     950   5      9   -1     950   6
PR. GEORGE   P.G.      9   -1     700   5      9   -1     700   6
SMITHERS     P.G.      9   -1     500   3      9    0     500   3
WELLS GRAY   P.G.      9   -4    1000   5      9   -1    1000   6
FT NLSN      F.N.     30  -17     750   7     32  -14     800   7
FT STJOHN    F.N.     20  -12     850   7     30   -5     950   7

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   57   W   69
SMITHERS              SW  65   W   69

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10    4     200   1     13    7     350   2
FRASER VLY   QUIL     10    2     150   1     13    7     350   2
SRN VRISL    QUIL      9    4     150   0     13    8     400   1
CNTRL VRISL  QUIL      9    2     150   0      9    6     200   0
NRN VRISL    HRDY     32    5     350   8     32    8     500   5
TERRACE      ANT       9    1     200   5      9    2     200   5
STEWART      ANT       9    1      20   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  15   SW   9   W   15
PORT HARDY   S   30   SW  28   SW  37
SANDSPIT     SW  48   SW  46   SW  48

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: POOR




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


END/MWSO