FPCN39 CWLW 071434
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 SATURDAY 7 MARCH 1998 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    0     200   1     28    4    1200   2
KAMLOOPS     KEL       9    0     350   1     36    4    1250   3
OKANAGAN     KEL      11    2     500   1     53    5    1850   4
CASTLEGAR    SPOK      9    2     950   3     48    4    1650   4
CRANBROOK    SPOK      9   -2     950   2     46    0    1800   5
REVELSTOKE   KEL      10    1     500   1     32    3    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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  13   W   28
CRANBROOK             W   11   W   30

TODAY'S VENTING: FAIR TO POOR

VENTING FOR SUNDAY: 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.      9   -8     950   3     48   -3    1450   9
PR. GEORGE   P.G.     47   -4    1050  12     54   -2    1300  10
SMITHERS     P.G.      9   -6     500   3     65   -2    1300  10
WELLS GRAY   P.G.     10   -6    1000  12     47   -4    1400  10
FT NLSN      F.N.      9  -19     400   4     43  -14    1350   4
FT STJOHN    F.N.     33  -15    1350   4     55  -12    1850   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  19   NW  13
SMITHERS              E   22   VR  13

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR SUNDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     23    6     300   7    100    9    1850  10
FRASER VLY   QUIL     18    4     200   7    100   10    1900  10
SRN VRISL    QUIL     20    5     200   6     93    9    1600   9
CNTRL VRISL  QUIL     34    7     400   8    100   10    1900   9
NRN VRISL    HRDY     22    6     250   6    100    9    1600  12
TERRACE      ANT       9    0     200   9     74    4    1400   8
STEWART      ANT      11    3      50   4     34    4     550   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  22   S   22   SW  30
PORT HARDY   SE  43   SE  50   S   39
SANDSPIT     SE  61   SE  52   SE  41

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR SUNDAY: FAIR


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


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