FPCN39 CWLW 241337
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 24 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       9   19     600   0    100   28    3200   6
KAMLOOPS     KEL      20   19     650   4    100   29    3350   6
OKANAGAN     KEL       9   18     600   0    100   29    3350   6
CASTLEGAR    SPOK     41   19    1100   6     90   27    3500   5
CRANBROOK    SPOK     51   17    1800   6     84   25    3950   4
REVELSTOKE   KEL      35   19    1000   5    100   26    3450   6

*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   VR   5   VR   5
CRANBROOK             VR   5   W   13

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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   14     950  17    100   24    3950  13
PR. GEORGE   P.G.     10   13     800   1    100   23    3700  12
SMITHERS     P.G.     11   13     750   1    100   20    3500  12
WELLS GRAY   P.G.     10   14    1000  17    100   25    4000  13
FT NLSN      F.N.     63   13     550  47    100   22    3400  32
FT STJOHN    F.N.      9   13     700  49    100   21    3700  31

*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: GOOD

VENTING FOR TUESDAY: GOOD



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     48   17    1250   4     61   23    1700   4
FRASER VLY   QUIL     48   17    1200   4     68   24    1850   5
SRN VRISL    QUIL     12   15     150   3     53   22    1450   4
CNTRL VRISL  QUIL     45   17    1150   4     71   25    2100   4
NRN VRISL    HRDY      9   13       0   5     71   18    1150   8
TERRACE      ANT      10   13     250  14    100   18    2050  11
STEWART      ANT       9   13       0   5     99   18    1400  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   VR   5
PORT HARDY   W   13   SW  13   SW  20
SANDSPIT     SW  61   SW  52   W   50

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD


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


END/MWSO