FPCN39 CWLW 021326
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 SUNDAY 2 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      16   25     500   2    100   35    3200   7
KAMLOOPS     KEL      12   22     500   2    100   34    3350   7
OKANAGAN     KEL      12   22     500   2    100   33    3350   7
CASTLEGAR    SPOK     36   24    1050   5    100   31    3500   7
CRANBROOK    SPOK      9   20     950   7    100   27    3950   8
REVELSTOKE   KEL      10   22     500   2     79   30    1800   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
PENTICTON    VR   5   VR   5   NW   9
CRANBROOK             NW   9   NW  17

TODAY'S VENTING: GOOD




VENTING FOR MONDAY: GOOD




CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   ANT      52   16    1950   5     89   31    3950   5
PR. GEORGE   ANT      49   14    1350   7     95   28    3700   5
SMITHERS     ANT       9   14     550   6     95   27    3500   5
WELLS GRAY   ANT      54   16    2050   5     89   30    4000   5
FT NLSN      F.N.      9   15     400  29     88   26     400  29
FT STJOHN    F.N.      9   19     700  25    100   26    3700  16

*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            W    18  W   24
SMITHERS              VR   5   S   20

TODAY'S VENTING: GOOD




VENTING FOR MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     32   19     550   5     50   24    1050   5
FRASER VLY   QUIL     32   19     550   5     58   26    1300   5
SRN VRISL    QUIL     22   17     450   3     31   23     800   3
CNTRL VRISL  QUIL     22   17     450   3     56   29    1500   4
NRN VRISL    HRDY     25   15     550   3     43   21     900   5
TERRACE      ANT      18   15     300  11    100   26    3200   6
STEWART      ANT      29   17     300   8     91   26    2100   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SE   9   S   13
PORT HARDY   VR   5   S   13   S   20
SANDSPIT     NW  15   S   15   S   24

TODAY'S VENTING: FAIR




VENTING FOR MONDAY: GOOD




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


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