FPCN39 CWLW 021400
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 SATURDAY 2 OCTOBER 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      17    9     550   2     98   16    2300   8
KAMLOOPS     KEL      37    9     950   5     96   15    2400   8
OKANAGAN     KEL      13    7     550   2     96   15    2350   8
CASTLEGAR    SPOK     18    8     800   3     81   16    1950   8
CRANBROOK    SPOK      9    4     950   7     51   10    1650   7
REVELSTOKE   KEL      11    6     550   2     90   13    2250   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  11   NW  26
CRANBROOK             VR   5   NW  15

TODAY'S VENTING: GOOD THIS AFTERNOON EXCEPT FAIR IN THE SOUTHEAST.

VENTING FOR SUNDAY: 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.     34    4    1550   5    100    9    3950   8
PR. GEORGE   P.G.     25    3    1000   6     53    8    1950   5
SMITHERS     P.G.     25    4     950   4     44    8    1500   4
WELLS GRAY   P.G.     34    2    1600   5    100    9    4000   8
FT NLSN      F.N.      9    0     400   0     17    3     850   2
FT STJOHN    F.N.      9   -2     700   4     62    3    1450   9

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   19   NW  39
SMITHERS              W   24   W   39

TODAY'S VENTING: FAIR THIS AFTERNOON EXCEPT GOOD ABOVE 700 METRES.


VENTING FOR SUNDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     17   11     150   9     49   16     450  14
FRASER VLY   QUIL     28   14     300   9    100   21    1300  16
SRN VRISL    QUIL     19   12     200   7     54   19     650  11
CNTRL VRISL  QUIL     21   13     200   7     54   19     650  11
NRN VRISL    HRDY     10   10     150   1     52   12     700   8
TERRACE      ANT      10    6     250  14     75   11    1050  12
STEWART      ANT      11    8      50   5     48   11     500  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   N   17   N   31
PORT HARDY   N   11   N   26   NW  35
SANDSPIT     W   20   W   37   W   52

TODAY'S VENTING: FAIR THIS AFTERNOON EXCEPT GOOD INLAND.

VENTING FOR SUNDAY: FAIR




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

END/MWSO
$$$$^^