FPCN39 CWLW 081400
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 SUNDAY 8 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      62   23     900   20   100   28    2300  22
KAMLOOPS     KEL      22   23     650   2    100   28    3350  13
OKANAGAN     KEL      34   21     750   7    100   26    2250  12
CASTLEGAR    SPOK     51   19    1050   9    100   24    3500  15
CRANBROOK    SPOK     65   20    1050  10    100   23    3950  12
REVELSTOKE   KEL      12   19     550   3     78   22    1550  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   15   NW  19
CRANBROOK             W   15   W   39

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: 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.     10   19     950   2    100   25    3950  10
PR. GEORGE   P.G.     38   19     500   8    100   24    1900  12
SMITHERS     P.G.     16   18     750   4     81   23    1300  14
WELLS GRAY   P.G.     15   15    1500   2    100   26    4000  10
FT NLSN      F.N.     12   20     700   2    100   26    2450  11
FT STJOHN    F.N.     19   19    1050   2    100   24    2650  12

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   24   W   30
SMITHERS              SW  33   SW  30

TODAY'S VENTING: GOOD


VENTING FOR MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     50   19     500  13     93   22    1300  12
FRASER VLY   QUIL     23   19     750   3     96   23    1400  12
SRN VRISL    QUIL     48   17     500   9     82   21    1050  11
CNTRL VRISL  QUIL     75   20     900  11     92   23    1350  11
NRN VRISL    HRDY     21   15     250   6     50   17     800   8
TERRACE      ANT      40   20     350  15    100   24    2300  17
STEWART      ANT      52   18     600   9    100   24    1800  15

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   VR   5
PORT HARDY   SW  11   S   22   SW  24
SANDSPIT     SW  33   SW  46   W   46

TODAY'S VENTING: GOOD EXCEPT FAIR NORTHERN VANCOUVER ISLAND


VENTING FOR MONDAY: GOOD




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


END/MWSO
$$$$^^