FPCN39 CWLW 031319
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 PDT MONDAY 3 AUGUST 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      23   26     650   3    100   38    3200   9
KAMLOOPS     KEL      17   24     600   3    100   38    3350   9
OKANAGAN     KEL      17   24     600   3    100   36    3350   9
CASTLEGAR    SPOK     30   25     900   5    100   34    3500   8
CRANBROOK    SPOK      9   20     950  10    100   29    3950   9
REVELSTOKE   KEL      10   22     500   2     72   32    2050   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   19   S   26
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD




VENTING FOR TUESDAY: 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.      9   18     950   7    100   31    3950  13
PR. GEORGE   P.G.     13   17     850   3     84   30    2150   8
SMITHERS     P.G.      9   17     800   0     80   28    1000   4
WELLS GRAY   P.G.      9   19    1000   7    100   32    4000  13
FT NLSN      F.N.     27   18     500  17     80   27    1050  16
FT STJOHN    F.N.      9   20     700  17    100   26    2050  13

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE   NE  10   S   23   S   36
SMITHERS              S   17   S

TODAY'S VENTING: GOOD




VENTING FOR TUESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     25   19     350   6     41   25     800   5
FRASER VLY   QUIL     36   22     550   6     72   31    1700   5
SRN VRISL    QUIL     24   19     350   5     41   26     900   4
CNTRL VRISL  QUIL     19   18     300   4     70   31    1700   5
NRN VRISL    HRDY     15   15     300   2     19   20     500   2
TERRACE      ANT       9   15     200  14    100   26    1800  14
STEWART      ANT       9   18     150   0      9   26    1300   0

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE   9   S   33   S   41
PORT HARDY   S   13   S   41   S   56
SANDSPIT     S   17   S   26   S   41

TODAY'S VENTING: FAIR




VENTING FOR TUESDAY: GOOD




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


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