FPCN39 CWLW 091327
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 9 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       9   19     200   0     23   25     650   3
KAMLOOPS     KEL       9   16     350   0     84   25    2050   7
OKANAGAN     KEL       9   18     350   0     96   26    2450   8
CASTLEGAR    SPOK     22   20     750   5     82   27    1750   9
CRANBROOK    SPOK      9   18     950   9    100   25    2300  14
REVELSTOKE   KEL       9   15     450   0     81   24    2050   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   SW  17
CRANBROOK             SW   9   SW  20

TODAY'S VENTING: POOR BECOMING 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.     80   12    1950  11    100   18    3950  12
PR. GEORGE   P.G.     16   10     850   5    100   17    2850   9
SMITHERS     P.G.      9    6     500   2     58   14    1350   8
WELLS GRAY   P.G.     83   12    2100  11    100   18    4000  12
FT NLSN      F.N.      9   10     400  21    100   19    2550  20
FT STJOHN    F.N.     11   10     700  23    100   18    3700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              S   20   SW

TODAY'S VENTING: POOR BECOMING 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     99   16    1100  16    100   22    1500  14
FRASER VLY   QUIL     94   16    1000  16    100   22    1500  14
SRN VRISL    QUIL      9   14     400   0    100   20    1450  12
CNTRL VRISL  QUIL      9   12     150   0     99   19    1450  12
NRN VRISL    HRDY      9   11       0   5    100   17    1850  10
TERRACE      ANT      86   12    1200  13    100   16    2000  16
STEWART      ANT      11   11      50   4    100   16    1750  13

*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    W   13   W   13   SW  19
PORT HARDY   S   19   SW  20   SW  22
SANDSPIT     S   37   S   37   S   35

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD

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


END/LEC