FPCN39 CWLW 021428
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 TUESDAY 2 FEBRUARY 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      21    6     650   3     52    8    1350   5
KAMLOOPS     KEL      63    8    1600   6     67    9    1700   6
OKANAGAN     KEL       9    4     350   2     45    6    1250   5
CASTLEGAR    SPOK     10    2     500  21     10    3     500  21
CRANBROOK    SPOK     11    1     950  41     48    2    1090  40
REVELSTOKE   KEL       9    3     450   2     28    4    1050   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   19   W   48   W  102
CRANBROOK             W   43   W  106

TODAY'S VENTING: GOOD NORTH BECOMING FAIR SOUTH AND POOR EAST.


VENTING FOR WEDNESDAY: GOOD


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.     10    1     950  32     64    2    1150  32
PR. GEORGE   P.G.     10    1     700  29     10    2     700  29
SMITHERS     P.G.      9   -5     500  10      9   -3     500  10
WELLS GRAY   P.G.      9   -2     920  25     61    2    1200  32
FT NLSN      F.N.      9  -26     400   3     12  -23     500   3
FT STJOHN    F.N.     36  -11     950  12     33  -12     900  12

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   61   NW  78
SMITHERS              W   52   W   78

TODAY'S VENTING: GOOD SOUTH. POOR NORTH AND WEST.


VENTING FOR WEDNESDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12    7     100  42     52    8     100  42
FRASER VLY   QUIL      9    6      50  17     49    7      50  17
SRN VRISL    QUIL      9    8       0  15     57   10     250  16
CNTRL VRISL  QUIL      9    7      50  15     56    9      50  15
NRN VRISL    HRDY      9    5       0  12     55    6     300  16
TERRACE      ANT       9   -2     200  15      9   -1     200  15
STEWART      ANT       9   -4     180  10      9   -1       0   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   65   W   85   W   85
PORT HARDY   NW  65   NW  82   W   80
SANDSPIT     W   67   W   80   W   78

TODAY'S VENTING: FAIR TO GOOD OVER SOUTH COAST. POOR NORTH COAST.

VENTING FOR WEDNESDAY: FAIR


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


END/MWSO