FPCN39 CWLW 071400
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 7 AUGUST 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       9   24     600   0     36   30    1150   3
KAMLOOPS     KEL      13   24     700   1     40   30    1450   3
OKANAGAN     KEL       9   21     500   0     30   28    1100   3
CASTLEGAR    SPOK     51   22    1300   8    100   28    3500  11
CRANBROOK    SPOK     56   20    1300   8    100   27    3950   7
REVELSTOKE   KEL       9   21     550   0     16   25     800   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   SE  15

TODAY'S VENTING: FAIR EXCEPT GOOD OVER THE SOUTHEAST.


VENTING FOR SUNDAY: POOR




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.     24   19    1200   6    100   26    3950   9
PR. GEORGE   P.G.     21   20    1100   3    100   27    3700   8
SMITHERS     P.G.     22   21    1050   3    100   27    3500   6
WELLS GRAY   P.G.     19   17    1200   5    100   27    4000   9
FT NLSN      F.N.     29   21     650   8     92   29    1550  13
FT STJOHN    F.N.      9   19     700  15    100   27    2300  13

*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   17   W   19
SMITHERS              W   19   W   19

TODAY'S VENTING: GOOD


VENTING FOR SUNDAY: FAIR TO GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     52   20     750   8     68   23    1000   9
FRASER VLY   QUIL     52   20     700   8     68   23     950   9
SRN VRISL    QUIL     26   16     350   5     46   20     700   7
CNTRL VRISL  QUIL     54   22     800   7     81   26    1400   8
NRN VRISL    HRDY     21   15     450   3     23   17     550   3
TERRACE      ANT      20   18     330   3     45   23    1500   5
STEWART      ANT      11   18     250   1     18   24     950   1

*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    SW  15   W    9   VR   5
PORT HARDY   W   13   NW  13   NW   9
SANDSPIT     W   13   W   13   W   15

TODAY'S VENTING: POOR TO FAIR


VENTING FOR SUNDAY: POOR TO FAIR




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


END/mwso
$$$$^^