FPCN39 CWLW 241427
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 TUESDAY 24 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     550   0     78    8    1900   6
KAMLOOPS     KEL       9    0     550   0     75    6    1800   6
OKANAGAN     KEL       9    1     550   0     71    5    1550   6
CASTLEGAR    SPOK     22    1     750   5     67    5    1500   8
CRANBROOK    SPOK      9   -1     950   8     66    4    1900   8
REVELSTOKE   KEL      13    1     700   2     59    4    1500   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N   11   N   15
CRANBROOK             VR   5   E   17

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: 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.      9   -2     950   5     71    4    2400   6
PR. GEORGE   P.G.     26    0     950   5     78    5    2400   6
SMITHERS     P.G.     29   -1     700  12     87    4    1600  12
WELLS GRAY   P.G.     48   -1    1550   5     69    5    2400   6
FT NLSN      F.N.      9   -9     400   8     15   -6     450   8
FT STJOHN    F.N.      9   -1     700   8     32    3    1000   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   13   S   17
SMITHERS              S   30   S   17

TODAY'S VENTING: GOOD EXCEPT POOR IN THE PEACE.

VENTING FOR WEDNESDAY: FAIR TO POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10    4     200   1     64    9    1150   7
FRASER VLY   QUIL     10    4     200   1     64    9    1150   7
SRN VRISL    QUIL     10    5     200   1     70   10    1250   7
CNTRL VRISL  QUIL     10    3     150   1     40    7     850   5
NRN VRISL    HRDY      9    4       0   2     40    7     850   4
TERRACE      ANT      11    2     250  25    100    5     850  25
STEWART      ANT       9    3      25   8     45    5     200  22

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW   9   SW  11   SW  17
PORT HARDY   S   43   S   44   SW  43
SANDSPIT     NW  43   NW  30   W   17

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR WEDNESDAY: 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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