FPCN39 CWLW 281333
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 MONDAY 28 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      16   15     550   2     31   23    1350   2
KAMLOOPS     KEL      14   14     600   2     36   23    1850   2
OKANAGAN     KEL      13   12     500   2     26   21    1250   2
CASTLEGAR    SPOK     24   14     750   6     57   21    1350   7
CRANBROOK    SPOK     10   12     950   9     62   18    1700   9
REVELSTOKE   KEL      11   11     500   2     17   17     850   2

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  19   NW  30
CRANBROOK             W   15   W   35

TODAY'S VENTING: POOR

VENTING FOR TUESDAY: FAIR

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     950   2    100   17    3950  10
PR. GEORGE   P.G.      9    9     700   1    100   17    3700  12
SMITHERS     P.G.      9    6     550   1     65   14    1300   8
WELLS GRAY   P.G.     10    8    1000  10    100   16    4000  14
FT NLSN      F.N.     17    6     450   5    100   13    2750  17
FT STJOHN    F.N.      9    7     700   6    100   11    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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W  22     W 37
SMITHERS              W  17     W 44

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     14   13     200   4     21   17     350   5
FRASER VLY   QUIL     15   13     200   4     34   21     700   4
SRN VRISL    QUIL     15   13     200   4     26   19     450   4
CNTRL VRISL  QUIL     16   14     200   4     36   22     750   4
NRN VRISL    HRDY     56   13     400  15     75   17    1050  10
TERRACE      ANT      74   11    1500   7     77   17    2350  10
STEWART      ANT      73   13    1500   6     98   17    2050   8

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   11   NW  20   NW  31
PORT HARDY   NW  26   NW  35   NW  50
SANDSPIT     SW  17   W   31   W   44

TODAY'S VENTING: POOR SOUTH. FAIR NORTH

VENTING FOR TUESDAY: FAIR



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


END/LM