FPCN39 CWLW 141417
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 14 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    6     200   6     50    8    1300   8
KAMLOOPS     KEL      19   10     850   8     50   13    1300   8
OKANAGAN     KEL      12    6     500   7     50    8    1300   8
CASTLEGAR    SPOK      9    4     500   6     30    6    1200   6
CRANBROOK    SPOK      9    4     950  31     40    7    1250   5
REVELSTOKE   KEL       9    2     450   2     35    4     450   5

*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    VR   5   SW  15   SW  33
CRANBROOK             SW  19   SW  54

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR MONDAY: 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.     50    0    1650   7    100    3    2750  10
PR. GEORGE   P.G.     38    0    1050   9     85    4    2150   9
SMITHERS     P.G.     10   -1     650   1     70    5    1850   6
WELLS GRAY   P.G.     10   -1     650   1    100    4    4000  12
FT NLSN      F.N.      9   -2     400   4     46    4     800   6
FT STJOHN    F.N.      9    0     700  18    100    3    2850  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   SW  33
SMITHERS              SW  13   S   33

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR MONDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     41    7     100  24     70   10    1150   8
FRASER VLY   QUIL     41    7     450  17     70    9    1000   8
SRN VRISL    QUIL     41    8     700  17     70   11    1200   8
CNTRL VRISL  QUIL     49    7     350  14     70   11    1200   8
NRN VRISL    HRDY     37    4     350  10     70    8    1550   8
TERRACE      ANT      29    0     200   7     63    2     950   6
STEWART      ANT      29    0     200   7     61    2     900   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   15   SW  22   SW  30
PORT HARDY   NW  15   W   17   SW  28
SANDSPIT     S   33   SW  37   SW  35

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: FAIR.




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


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