FPCN39 CWLW 191450
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 19 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      15    4     450   2     15    4     450   2
KAMLOOPS     KEL      12    3     500   2     12    4     500   2
OKANAGAN     KEL       9    1     350   2     12    4     500   2
CASTLEGAR    SPOK      9    3     500  14     42    4     750  14
CRANBROOK    SPOK      9    0     950  32      9    2     950  22
REVELSTOKE   KEL      10    1     450   2     10    2     500   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   19   SW  52
CRANBROOK             SW  17   SW  48

TODAY'S VENTING: GENERALLY POOR.




VENTING FOR WEDNESDAY: 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.     10    0     950  25     10    0     950  25
PR. GEORGE   P.G.      9   -2     700  19      9   -1     700  19
SMITHERS     P.G.      9   -4     500   1      9   -3     500   1
WELLS GRAY   P.G.     ##   ##     ###  ##     10    0    1000  25
FT NLSN      F.N.      9  -18     400   0      9  -17     400   0
FT STJOHN    F.N.     24  -11    1200   3     24  -11    1200   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   33   W   48
SMITHERS              W   24   W   48

TODAY'S VENTING: POOR.




VENTING FOR WEDNESDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10    8     100  17     94   10     950  18
FRASER VLY   QUIL     10    8      50  17     60    9      50  17
SRN VRISL    QUIL     52    9     550  10     81   10     800  15
CNTRL VRISL  QUIL      9    6      50   3     36    8     350  10
NRN VRISL    HRDY      9    5      50   1     12    8     300   1
TERRACE      ANT       9   -3     200   9      9   -3     200   9
STEWART      ANT      ##   ##     ###  ##      9   -3       0   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
VANCOUVER    SE  19   S   20   S   19
PORT HARDY   N   19   N   11   W   15
SANDSPIT     NW  31   NW  33   NW  33

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




VENTING FOR WEDNESDAY: FAIR.




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


END/TCS