FPCN39 CWLW 191329
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 19 JULY 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      40   21     450  12     55   27     800  15
KAMLOOPS     KEL      30   20     450  10     60   28    1600  12
OKANAGAN     KEL      15   20     500   5     60   29    2000  10
CASTLEGAR    SPOK     32   21     850   7     74   30    1250  13
CRANBROOK    SPOK     15   19     950  17    100   30    3950  17
REVELSTOKE   KEL      12   20     500   8     55   27    1600  10

*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    W   11   W   26   W   35
CRANBROOK             W   13   W   33

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   P.G.      9   13     950  15     80   19    1750  14
PR. GEORGE   P.G.      9   13     700   3     60   19    1350  10
SMITHERS     P.G.      9   15     500   3     63   19    1250  10
WELLS GRAY   P.G.     45   15    1300  15     87   20    2000  13
FT NLSN      F.N.     34   18     650  11     86   25    1650  10
FT STJOHN    F.N.      9   15     700  11     75   22    1750  10

*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
SMITHERS              W   24   W

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     43   16     550   9    100   22    1750  11
FRASER VLY   QUIL     55   17     700   9    100   22    1700  11
SRN VRISL    QUIL     25   15     300   6     86   21    1450   9
CNTRL VRISL  QUIL     25   15     300   6     86   21    1500   9
NRN VRISL    HRDY     15   14      50  13     88   17     900  15
TERRACE      ANT      ##   ##     ###  ##    100   19    1900  23
STEWART      ANT      60   15     550  12    100   19    1450  20

*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    W   19   W   26   W   43
PORT HARDY   W   15   W   22   W   37
SANDSPIT     SW  24   W   22   W   26

VENTING FOR MONDAY: GOOD

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


END/MWSO