FPCN39 CWLW 151325
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 TUESDAY 15 SEPTEMBER 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      13   17     550   1     60   29    3200   6
KAMLOOPS     KEL      11   15     500   1     60   28    3350   6
OKANAGAN     KEL      11   15     500   1     60   28    3350   6
CASTLEGAR    SPOK     19   18     750   4     60   30    3550   4
CRANBROOK    SPOK      9   17     950   4     60   30    3950  10
REVELSTOKE   KEL      10   14     500   1     60   25    3450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   19   SW  33
CRANBROOK             SW  11   SW  33

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: 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    9     950   6    100   20    3950   8
PR. GEORGE   P.G.     13    8     850   3    100   17    3700   7
SMITHERS     P.G.     11    6     750   1     84   16    2150   5
WELLS GRAY   P.G.     42   10    1750   5    100   20    4000   8
FT NLSN      F.N.     32    7     500  18     74   12     850  21
FT STJOHN    F.N.      9    7     700  23    100   15    3700  23

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              NE  13   VR

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   16     250   0     22   20     450   0
FRASER VLY   QUIL      9   16     250   0     16   26    1200   1
SRN VRISL    QUIL      9   15     200   0     22   22     550   0
CNTRL VRISL  QUIL      9   14     200   0     12   24     750   0
NRN VRISL    QUIL      9   11     150   0     22   16     250   0
TERRACE      ANT      40   10     500  13    100   19    3200  10
STEWART      ANT      69   13     750  11    100   19    1900  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S   17   S   30
PORT HARDY   VR   5   S   20   SW  43
SANDSPIT     N   52   N   41   N   24

TODAY'S VENTING: POOR TO GOOD

VENTING FOR WEDNESDAY: GOOD




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


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