FPCN39 CWLW 171427
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 17 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      9    3     200   2
KAMLOOPS     KEL       9    0     350   2     28    3     650   3
OKANAGAN     KEL       9    0     350   2     38    3     950   3
CASTLEGAR    SPOK      9    1     800   9     48    3    1000   9
CRANBROOK    SPOK      9   -8     800   5     45    1     900   8
REVELSTOKE   KEL       9   -1     450   2     15    2     650   3

*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    SE   9   S   24   S   57
CRANBROOK    S    8   SW  13   SW  35

TODAY'S VENTING: POOR BECOMING FAIR IN THE AFTERNOON.

VENTING FOR MONDAY: FAIR BECOMING GOOD IN THE AFTERNOON.

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.     37   -6    1150  16     40   -5    1150  16
PR. GEORGE   P.G.     30   -7    1050   7     32   -6    1050   7
SMITHERS     P.G.     27   -5    1050   4     27   -4    1100   4
WELLS GRAY   P.G.     26   -6    1000   3     56   -2    1250  13
FT NLSN      F.N.      9  -12     400   8      9  -10     400   8
FT STJOHN    F.N.      9   -8     700  10      9   -6     700  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  22   SE  24
SMITHERS              E   33   E   24

TODAY'S VENTING: FAIR.

VENTING FOR MONDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15    6     150   7     60    7     350  24
FRASER VLY   QUIL      9    5      50   4     59    7     350  24
SRN VRISL    QUIL     14    6     150   4     24    8     400   4
CNTRL VRISL  QUIL     15    6     150   4     15    6     150   4
NRN VRISL    HRDY     60    5     400  17     60    5     400  17
TERRACE      ANT       9   -3      50   6     60   -1     200   3
STEWART      ANT       9   -1      20   7     30    0     100   3

*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  50   S   54   S   56
PORT HARDY   E   54   SE  59   SE  37
SANDSPIT     E   30   E   37   E   37

TODAY'S VENTING: POOR BECOMING FAIR TO GOOD THIS AFTERNOON.

VENTING FOR MONDAY: GOOD.

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


END/LEC