FPCN39 CWLW 131323
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 13 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      12   18     450   1    100   27    3200   9
KAMLOOPS     KEL      11   18     550   1    100   28    3350   9
OKANAGAN     KEL      11   17     500   1    100   25    3350   9
CASTLEGAR    SPOK     48   19     900  11    100   26    2700  20
CRANBROOK    SPOK     12   15     900   1    100   24    3950  27
REVELSTOKE   KEL       9   14     450   1     13   18     700   2

*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    W   11   W   26   W   37
CRANBROOK             W   13   W   37

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.    100   12    2200  23    100   21    3950  23
PR. GEORGE   P.G.     58   12    1200  13    100   18    3700  20
SMITHERS     P.G.     19   11     750   5    100   18    3500  20
WELLS GRAY   P.G.    100   14    4000  23    100   20    4000  23
FT NLSN      F.N.      9   14     400  21     29   17     500  21
FT STJOHN    F.N.     11   12     700  22    100   19    2450  25

*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
SMITHERS              W   28   W

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     58   15     750   9    100   20    1850  11
FRASER VLY   QUIL     55   15     650   9    100   20    1800  11
SRN VRISL    QUIL     28   14     350   6     99   20    1700  10
CNTRL VRISL  QUIL     13   13     150   3     77   17    1100  10
NRN VRISL    HRDY     16   12     200   4     66   16    1400   6
TERRACE      ANT      69   11     800  14    100   17    2450  10
STEWART      ANT      40   12     450   8    100   17    1950  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  17   W   24   W   37
PORT HARDY   SW  13   SW  15   SW  20
SANDSPIT     SW  19   SW  19   SW  17

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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