FPCN39 CWLW 181430
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 MONDAY 18 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   QUIL      9    2     200  41     11    5     200  41
KAMLOOPS     HRDY      9    2     350  25     40    4     500  25
OKANAGAN     HRDY      9    1     350  25     31    3     450  25
CASTLEGAR    HRDY      9    2     500  25     25    4     550  25
CRANBROOK    HRDY     10   -1     950  23     10    1     950  23
REVELSTOKE   HRDY      9    0     450  25      9    1     450  25

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  30   SW  72
CRANBROOK             SW  24   W   67

TODAY'S VENTING: POOR BECOMING FAIR.

VENTING FOR TUESDAY: FAIR TO 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   HRDY     10    0     950  23     75    2    1350  23
PR. GEORGE   HRDY      9   -2     700  22     10   -1     700  22
SMITHERS     HRDY      9   -6     500  25      9   -4     500  25
WELLS GRAY   HRDY      9   -8     500  15     90    2    1550  25
FT NLSN      F.N.      9  -16     400   0      9  -13     650   0
FT STJOHN    F.N.      9  -14     700   4      9  -12     700   4

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   S   24
SMITHERS              SE  15   S   24

TODAY'S VENTING: POOR BECOMING GOOD IN THE HIGHER ELEVATIONS.

VENTING FOR TUESDAY: POOR IN VALLEYS. FAIR TO GOOD ELSEWHERE.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100  41     28    8     150  41
FRASER VLY   QUIL      9    6      50  41     28    8     150  41
SRN VRISL    QUIL     17    8      50  16     41    9     250  16
CNTRL VRISL  QUIL     16    8     100  16     43    9     250  16
NRN VRISL    HRDY     68    6     450  20     73    7     500  20
TERRACE      HRDY      9   -4     200  24      9   -3     200  24
STEWART      ANT       9   -7     200  24      9   -3     200   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  44   SW  65   SW  67
PORT HARDY   SW  24   SW  31   SW  31
SANDSPIT     NW  33   NW  31   W   26

TODAY'S VENTING: POOR BECOMING FAIR TO GOOD.

VENTING FOR TUESDAY: FAIR TO GOOD IN THE AFTERNOON.

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


END/