FPCN39 CWLW 301326
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 30 AUGUST 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      19   22     500   3     87   33    2250   6
KAMLOOPS     KEL      13   19     500   3     85   32    2350   6
OKANAGAN     KEL      13   19     500   3     88   33    2500   6
CASTLEGAR    KEL       9   20     500   9     87   31    2400   7
CRANBROOK    KEL       9   17     950   5     93   31    3950   5
REVELSTOKE   KEL      10   17     500   3     66   28    1500   7

*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   VR   5   W    9
CRANBROOK             VR   5   VR   5

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.     83   15    1550  19    100   24    3950  18
PR. GEORGE   P.G.      9   15     700   3    100   25    3700  15
SMITHERS     P.G.      9   11     500   3    100   22    2150  15
WELLS GRAY   P.G.     99   15    1900  19    100   25    4000  18
FT NLSN      F.N.      9   12     400  32    100   20    3400  40
FT STJOHN    F.N.      9   10     700  40    100   22    3700  41

*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
SMITHERS              SE  11   SW

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     46   19     600   9     67   24     850  10
FRASER VLY   QUIL     54   20     650  10     84   29    1250  10
SRN VRISL    QUIL     38   17     500   7     64   24     850   9
CNTRL VRISL  QUIL     50   20     600   8     84   30    1300   9
NRN VRISL    HRDY     11   16     250   1     22   19     650   2
TERRACE      ANT      39   13     950   5    100   21    3200   8
STEWART      ANT      62   17    1550   5    100   21    3000   7

*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    NW  15   NW  11   W   13
PORT HARDY   VR   5   W   13   W   22
SANDSPIT     S   43   S   41   S   37

TODAY'S VENTING: GOOD EXCEPT POOR NORTH




VENTING FOR MONDAY: GOOD




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


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