FPCN39 CWLW 071419
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 SUNDAY 7 MARCH 1999 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    0     500   0    100    6    2500   5
KAMLOOPS     KEL       9    2     900   0    100    6    2500   5
OKANAGAN     KEL       9    0     600   0    100    7    2500   5
CASTLEGAR    SPOK     16    0     750   3    100    5    2500   5
CRANBROOK    SPOK      9   -1     950   7    100    3    2500   5
REVELSTOKE   KEL       9    0     700   0    100    5    1750   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   SW  20
CRANBROOK             VR   5   W   19

TODAY'S VENTING: POOR THIS MORNING BECOMING GOOD THIS AFTERNOON.

VENTING FOR MONDAY: POOR TO 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.     24   -3    1300   7    100    2    3950  13
PR. GEORGE   P.G.     24   -5     850   3    100    2    2200  13
SMITHERS     P.G.     44    0    1000   9     86    2    1600  12
WELLS GRAY   P.G.     25   -4    1200  12    100    3    4000  13
FT NLSN      F.N.      9  -16     400   8     40  -15    1150   8
FT STJOHN    F.N.      9   -7     750   3     40   -6    1200   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   24   SW  31
SMITHERS              S   28   SW  31

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON EXCEPT REMAINING FAIR
IN THE NORTHEAST.

VENTING FOR MONDAY: POOR TO FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     16    4     250   4     67    8    1350   6
FRASER VLY   QUIL     15    3     200   4     65    8    1300   6
SRN VRISL    QUIL     16    3     200   4     58    8    1150   6
CNTRL VRISL  QUIL     17    4     250   4     58    8    1200   6
NRN VRISL    HRDY     39    4     500   7     94    7    1700   9
TERRACE      ANT      44    1     700   8     90    3    1500  11
STEWART      ANT      44    1     600   8     90    3    1400  11

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   19   S   26   SW  31
PORT HARDY   S   35   S   44   S   39
SANDSPIT     SW  33   SW  37   SW  37

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.

VENTING FOR MONDAY: GOOD.




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


END/JDG