FPCN39 CWLW 251347
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 25 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      27    4     650   4     49    6    1000   6
KAMLOOPS     KEL       9    1     550   0     50    5    1150   6
OKANAGAN     KEL       9    1     550   0     50    5    1150   6
CASTLEGAR    SPOK     32    1     850   7     80    7    1850   8
CRANBROOK    SPOK      9   -2     950   9     82    3    2250   9
REVELSTOKE   KEL       9   -1     500   0     30    3     850   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   SW  11   SW  20
CRANBROOK             VR   5   W    9

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR THURSDAY: POOR TO 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.     10    0     950  20    100    4    2750  16
PR. GEORGE   P.G.     41    0     900  16    100    4    1900  16
SMITHERS     P.G.     28    0     800   8     67    2    1000  10
WELLS GRAY   P.G.     73    0    1550  18    100    4    2850  16
FT NLSN      F.N.      9   -9     400   9     29   -2     600   9
FT STJOHN    F.N.      9   -3     700   9     21    0     850   9

*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            W   22   W   26
SMITHERS              W   15   W   26

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR THURSDAY: POOR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     61    6     850   9    100    9    1850  18
FRASER VLY   QUIL     57    6     750   9    100    9    1800  17
SRN VRISL    QUIL     75    7    1050  10    100    9    1700  16
CNTRL VRISL  QUIL     27    5     450   5     77    7    1100  10
NRN VRISL    HRDY     58    5     550  12     96    7    1200  13
TERRACE      ANT       9    2     250   3     71    4    1550   7
STEWART      ANT       9    3     100   0     69    4     250   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    W   19   W   24   NW  24
PORT HARDY   NW  20   NW  24   NW  26
SANDSPIT     W   28   W   28   W   30

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: FAIR TO GOOD.




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


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