FPCN39 CWLW 221345
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 22 MARCH 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    9     200   1     85   15    2850  12
KAMLOOPS     KEL      12   10     650   1     80   16    2650  10
OKANAGAN     KEL      12   10     650   1     80   15    2450   8
CASTLEGAR    SPOK     35   10    1050   5    100   15    2700   9
CRANBROOK    SPOK    100   11    2750  11    100   15    3950  11
REVELSTOKE   KEL       9    7     450   1     81   12    2650   6

*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    SE   9   SE  24   S   50
CRANBROOK             VR   5   S   19

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: FAIR.




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    1100  19    100   12    3950  10
PR. GEORGE   P.G.     23    7     900   7    100   12    2450   8
SMITHERS     P.G.     11    5     650   2     82    9    2950   8
WELLS GRAY   P.G.     11    5     650   2    100   12    4000  14
FT NLSN      F.N.      9    3     400   0     45   10    1000   6
FT STJOHN    F.N.      9    4     700  21     40    9    1050   8

*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   39   S   54
SMITHERS              SE  37   SE  54

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR TUESDAY: FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     89   10     600  25    100   12    1300  33
FRASER VLY   QUIL     77   10     550  21    100   14    1550  35
SRN VRISL    QUIL     56   10     400  16    100   12    1150  27
CNTRL VRISL  QUIL     59   10     450  16    100   12    1150  27
NRN VRISL    HRDY     36    9     350   9    100   11     950  18
TERRACE      ANT       9    5     200  12     78    8    1000  13
STEWART      ANT       9    5     200  12     78    8    1000  13

*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    S   30   S   48   S   63
PORT HARDY   S   44   S   70   S   78
SANDSPIT     S   41   S   46   S   56

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: GOOD.




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


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