FPCN39 CWLW 291400
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 29 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      32   15     600   6    100   18    1650  13
KAMLOOPS     KEL       9   10     350   6     70   15    1100  12
OKANAGAN     KEL       9   10     350   6     69   15    1050  12
CASTLEGAR    SPOK     23   12     850   4     30   16    1050   4
CRANBROOK    SPOK      9   11     950  27     91   14    1450  27
REVELSTOKE   KEL       9    8     450   6      9   11     450   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   NW  13   NW  24
CRANBROOK             NW   9   NW  26

TODAY'S VENTING: GOOD EXCEPT POOR IN COLUMBIAS AND FAIR WEST
KOOTENAYS




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.     70    6    2100   5    100   11    3100   8
PR. GEORGE   P.G.     75    7    2000   4    100    9    3100   7
SMITHERS     P.G.     65    6    1900   7    100    9    3100   8
WELLS GRAY   P.G.     50    3    1900   3    100    7    3100   9
FT NLSN      F.N.     71    2    1000  14     90    5    1600  12
FT STJOHN    F.N.     83    3    1650  12    100    6    2350  12

*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   22   NW  35
SMITHERS              W   20   NW  35

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     28   13     300   9     55   16     600  12
FRASER VLY   QUIL     46   15     450  12     66   17     700  12
SRN VRISL    QUIL     35   14     350   9     59   17     650  10
CNTRL VRISL  QUIL     17   12     200   5     59   17     650  10
NRN VRISL    HRDY     10   10     100   1     77   13    1200   9
TERRACE      ANT      10    8     250  21    100   11    1300  21
STEWART      ANT      10    7      50   1     77   11     950  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   NW  19
PORT HARDY   N   19   N   26   N   24
SANDSPIT     NW  22   NW  24   NW  28

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.


END/
$$$$^^