FPCN39 CWLW 081400
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 8 SEPTEMBER 1999 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      33   17    1100   3     87   27    2550   5
KAMLOOPS     KEL      33   17    1350   3     84   25    2550   5
OKANAGAN     KEL      15   13     750   2     83   24    2500   5
CASTLEGAR    SPOK     21   14     850   4     95   23    2200   9
CRANBROOK    SPOK      9   12     950   5    100   21    2400   8
REVELSTOKE   KEL      19   13     900   2     65   21    2000   4

*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    SE  11   S   22   S   31
CRANBROOK             VR   5   S   11

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   12     950  10    100   19    3950  20
PR. GEORGE   P.G.     38   12     950  13    100   18    1850  21
SMITHERS     P.G.     23   10     800   5     27   13     900   5
WELLS GRAY   P.G.     10    9    1000   5    100   20    4000  20
FT NLSN      F.N.      9   11     700   0     80   15    2100   8
FT STJOHN    F.N.      9   10     700  13     82   15    2100  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   S   33
SMITHERS              S   33   S   33

TODAY'S VENTING: GOOD EXCEPT POOR IN THE SMITHERS AREA.

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     12   14     150   4     30   20     600   5
FRASER VLY   QUIL     21   18     350   5     33   25     900   3
SRN VRISL    QUIL     13   14     150   3     26   21     650   3
CNTRL VRISL  QUIL     16   16     250   4     28   23     700   3
NRN VRISL    HRDY     13   13     250   2     36   17     700   4
TERRACE      ANT      10    9     200   2     40   13     800   5
STEWART      ANT      11    8     200   2     40   13     800   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   20   S   31   S   31
PORT HARDY   S    9   S   37   S   48
SANDSPIT     SW  28   S   41   S   50

TODAY'S VENTING: POOR TO FAIR

VENTING FOR THURSDAY: GOOD


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


END/mwso
$$$$^^