FPCN39 CWLW 071332
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 7 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       9   20     500   0     45   32    1350   4
KAMLOOPS     KEL       9   19     500   0     48   32    1650   4
OKANAGAN     KEL       9   18     500   0     48   32    1600   4
CASTLEGAR    KEL       9   19     500   6    100   33    3500   8
CRANBROOK    KEL       9   16     950   3    100   32    3950  10
REVELSTOKE   KEL       9   16     500   0     29   26    1000   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   S   11   S   17
CRANBROOK             VR   5   S   20

TODAY'S VENTING: POOR TO GOOD




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.      9   12     950  13    100   22    3950  20
PR. GEORGE   P.G.     22   16     950   6     77   20    1700  10
SMITHERS     P.G.      9    9     500   2     18   15     750   4
WELLS GRAY   P.G.     51   16    1400  13    100   22    4000  20
FT NLSN      F.N.     31   11     600  10     65   18    1000  12
FT STJOHN    F.N.     10   14     700  14     71   18    1250  16

*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              SW  35   SW

TODAY'S VENTING: POOR TO 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      9   16     100   5     48   21     700   7
FRASER VLY   QUIL      9   16      50   5     73   25    1150   9
SRN VRISL    QUIL      9   16       0   4     47   22     700   7
CNTRL VRISL  QUIL     14   17     150   5     47   22     700   7
NRN VRISL    HRDY     15   14     150   5     36   17     500   6
TERRACE      ANT      72   12     500  32    100   16    2000  31
STEWART      ANT      38   13     200  16    100   16    1500  27

*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   17   W   19   SW  37
PORT HARDY   W   15   W   19   SW  31
SANDSPIT     SW  46   SW  48   SW  46

TODAY'S VENTING: FAIR TO GOOD




VENTING FOR TUESDAY: FAIR




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


END/WJW