FPCN39 CWLW 261357
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 26 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      21    3     600   3     52    6    1250   5
KAMLOOPS     KEL      43    3    1050   6     61    6    1800   5
OKANAGAN     KEL      29    2     700   6     49    5    1300   5
CASTLEGAR    SPOK     37    1     900   8     56    3    1200   8
CRANBROOK    SPOK     36   -1    1250   9     76    1    1850  11
REVELSTOKE   KEL      11    0     500   3     38    2    1050   6

*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   NW  13   NW  19
CRANBROOK             VR   5   NW  13

TODAY'S VENTING: FAIR TO GOOD.

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.     37   -3    1150  17    100    0    2400  13
PR. GEORGE   P.G.     23   -3     850   9     46   -1    1050  13
SMITHERS     P.G.     23   -3     800   6     43    0     950   9
WELLS GRAY   P.G.    100   -1    2300  13    100    1    4000  15
FT NLSN      F.N.     10   -7     400  16     74   -2     950  17
FT STJOHN    F.N.     60   -3    1100  17     71   -1    1200  17

*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            W   13   NW  17
SMITHERS              VR   5   W   17

TODAY'S VENTING: FAIR TO GOOD.

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     33    5     350  10    100    9    1500  17
FRASER VLY   QUIL     19    4     150   9     95    8    1100  15
SRN VRISL    QUIL     39    6     400   9    100   10    1650  17
CNTRL VRISL  QUIL     13    3     100   7     63    7    1200  11
NRN VRISL    HRDY      9    4       0   6     60    7    1300   5
TERRACE      ANT       9    1     250   7     56    3    1000   4
STEWART      ANT      11    2      50   3     62    3    1100   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
VANCOUVER    W   11   NW  11   NW  15
PORT HARDY   VR   5   W    9   NW  13
SANDSPIT     SW  24   SW  26   SW  30

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: 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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