FPCN39 CWLW 051317
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 SATURDAY 5 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      27   22     650   4     90   33    2500   6
KAMLOOPS     KEL      13   19     550   2     91   32    2700   6
OKANAGAN     KEL      13   19     550   2     91   32    2700   6
CASTLEGAR    SPOK     19   19     750   4     68   32    1550   8
CRANBROOK    SPOK     19   17     700   5    100   32    3950  12
REVELSTOKE   KEL      11   17     500   2     76   29    2150   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   SW  17
CRANBROOK             VR   5   W   13

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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.     39   12    1250  11    100   24    3950   9
PR. GEORGE   P.G.     17   11     850   5    100   20    3700   8
SMITHERS     P.G.     11    9     700   1     71   18    1600   8
WELLS GRAY   P.G.     27   11    1150  11    100   22    4000   9
FT NLSN      F.N.      9   10     400  13    100   20    3400  13
FT STJOHN    F.N.      9   10     700  18    100   19    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              SE  26   S

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     43   18     400  13     76   23     800  14
FRASER VLY   QUIL     44   18     350  13    100   27    1750  13
SRN VRISL    QUIL      9   15     200   0     69   21     800  10
CNTRL VRISL  QUIL      9   16     250   0    100   27    1750  11
NRN VRISL    HRDY      9   11      50   3     55   18     700  10
TERRACE      ANT       9   10     200   1     81   17    1750   7
STEWART      ANT      10   10     100   1     58   17    1300   5

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SW  11   SW  22
PORT HARDY   S   24   S   31   S   39
SANDSPIT     S   59   S   65   S   70

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

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


END/MWSO