FPCN39 CWLW 261327
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 WEDNESDAY 26 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   17     500   2    100   26    3200   6
KAMLOOPS     KEL      13   17     550   2    100   26    3350   6
OKANAGAN     KEL      12   16     500   2    100   27    3350   6
CASTLEGAR    SPOK     23   18     900   4    100   26    3500  13
CRANBROOK    SPOK      9   14     950  12    100   23    3950  16
REVELSTOKE   KEL      12   17     600   2     91   23    2700   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   13   W   20
CRANBROOK             W    9   W   22

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: 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.     10    8     400  18    100   22    3950  16
PR. GEORGE   P.G.     10    8     500  15    100   20    3700  15
SMITHERS     P.G.      7    7     200   8    100   18    2350  15
WELLS GRAY   P.G.     10    5    2700  17    100   21    4000  16
FT NLSN      F.N.      9    9     400   9    100   18    1600  22
FT STJOHN    F.N.      9   11     700   9    100   17    2600  22

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE             W 20     W 25
SMITHERS              SW 20    SW 30

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     39   17     650   6     65   23    1950   6
FRASER VLY   QUIL     27   16     400   6     75   23    1900   6
SRN VRISL    QUIL     20   16     350   4     65   22    1850   5
CNTRL VRISL  QUIL     27   17     550   4     75   25    2000   5
NRN VRISL    HRDY     16   14     150   6     60   17    1200   8
TERRACE      ANT      19   12     550   3     89   18    2050   7
STEWART      ANT      20   14     550   2     84   18    1850   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  13   W   17   W   20
PORT HARDY   W   13   SW  19   W   30
SANDSPIT     S   44   SW  44   SW  48

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD

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

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