FPCN39 CWLW 121443
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 THURSDAY 12 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      16    8     550   2     40   13    1350   3
KAMLOOPS     KEL      27   10    1050   3     49   15    2000   3
OKANAGAN     KEL      13    6     550   2     39   12    1500   3
CASTLEGAR    SPOK     30    7     900   5     35   10    1050   5
CRANBROOK    SPOK      9    3     950   6     43   10    1550   7
REVELSTOKE   KEL      11    5     550   2     19    8     800   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   S   24
CRANBROOK             VR   5   W   24

TODAY'S VENTING: FAIR

VENTING FOR FRIDAY: 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.     10    7     950  24    100   10    2000  19
PR. GEORGE   P.G.      9    4     700  15     82    9    1300  18
SMITHERS     P.G.     10    2     600   1     41    5    1050   5
WELLS GRAY   P.G.     10    5    1000  24    100   11    2350  17
FT NLSN      F.N.     97   -5    1150  22    100    0    1300  23
FT STJOHN    F.N.     94    0    1350  23     96    2    1400  23

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   17   SW  17
SMITHERS              SE  35   S   17

TODAY'S VENTING: GOOD EXCEPT ONLY FAIR IN THE NORTHWEST.

VENTING FOR FRIDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   11     100   6     19   14     250   6
FRASER VLY   QUIL      9   11      50   6     49   15     450  13
SRN VRISL    QUIL      9   11       0   5     19   14     200   6
CNTRL VRISL  QUIL      9   10      50   5      9   11      50   5
NRN VRISL    HRDY     41   11     200  22     48   12     300  15
TERRACE      ANT       9    4     200   9      9    5     200   9
STEWART      ANT       9    7       0   8      9    5       0   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  24   SE  35   S   44
PORT HARDY   SE  46   S   65   S   74
SANDSPIT     S   19   SE  20   SE  30

TODAY'S VENTING: POOR TO FAIR

VENTING FOR FRIDAY: FAIR

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


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