FPCN39 CWLW 141323
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 14 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   19     550   2     75   28    1900   6
KAMLOOPS     KEL      12   16     500   2     85   27    2150   7
OKANAGAN     KEL      13   17     550   2     85   27    2150   7
CASTLEGAR    SPOK     17   17     750   3     57   27    1800   5
CRANBROOK    SPOK      9   15     950   6    100   27    3950   7
REVELSTOKE   KEL      10   15     500   2     39   23    1250   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  30
CRANBROOK             SW  11   W   30

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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.      9    8     950   6    100   18    3950   8
PR. GEORGE   P.G.     15    9     850   4     78   17    2700   5
SMITHERS     P.G.      9    7     550   2     46   14     950   6
WELLS GRAY   P.G.      9   10    1000   6    100   19    4000   8
FT NLSN      F.N.     22    8     500  14    100   15    1950  11
FT STJOHN    F.N.      9    8     700  13    100   16    3700  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              VR   5   W

TODAY'S VENTING: GOOD EXCEPT FAIR IN THE NORTHWEST.

VENTING FOR TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     39   16     550   8     48   21     900   6
FRASER VLY   QUIL     44   17     600   8     63   25    1450   5
SRN VRISL    QUIL     34   15     450   6     46   21     850   5
CNTRL VRISL  QUIL     33   15     500   6     56   24    1250   5
NRN VRISL    HRDY     22   12     300   5     70   16    1150   8
TERRACE      ANT       9    9     250   5    100   15    2600   7
STEWART      ANT      26   11     600   3     75   15    1800   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SW  15   W   39
PORT HARDY   N   11   W    9   SW  20
SANDSPIT     N   22   NW  17   W   13

TODAY'S VENTING: GOOD EXCEPT ONLY FAIR NEAR THE WATER.

VENTING FOR TUESDAY: GOOD

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


END/MWSO