FPCN39 CWLW 111339
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 WEDNESDAY 11 FEBRUARY 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    2     200   3     37    6     800   5
KAMLOOPS     KEL       9    3     350   2     34    6     900   5
OKANAGAN     KEL       9    2     350   2     34    5     900   5
CASTLEGAR    SPOK      9    3     500   4     28    5     900   5
CRANBROOK    SPOK      9    1     950   5     26    4    1300   5
REVELSTOKE   KEL       9    2     450   2     17    4     600   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   SW  26
CRANBROOK             VR   5   W   22

TODAY'S VENTING: POOR TO FAIR

VENTING FOR THURSDAY: 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    0     950  16     21    3    1100   8
PR. GEORGE   P.G.      9    2     700   8     22    3     850   8
SMITHERS     P.G.      9   -1     500   4     10    1     550   4
WELLS GRAY   P.G.     10    2    1000  16     17    3    1100   8
FT NLSN      F.N.     25  -14     700   5     29  -12     800   5
FT STJOHN    F.N.     26   -2    1150   4     38    0    1100   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   37   S   37
SMITHERS              S   28   S   37

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR THURSDAY: FAIR TO GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     75    8     700  16    100   10    1100  17
FRASER VLY   QUIL     52    7     450  14     91    9    1000  17
SRN VRISL    QUIL     56    8     550  11    100   11    1200  16
CNTRL VRISL  QUIL     16    6     150   6     34    6     300  10
NRN VRISL    HRDY     48    7     350  15    100    9     950  22
TERRACE      ANT       9    1     200  12     21    3     300  15
STEWART      ANT       9    2       0  12     35    3     200  15

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   30   S   37   S   39
PORT HARDY   SE  52   S   63   S   61
SANDSPIT     SE  67   S   69   S   61

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR THURSDAY: GOOD TO FAIR

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


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