FPCN39 CWLW 311400
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 TUESDAY 31 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    9     200   5    100   18    2550  15
KAMLOOPS     KEL       9   11     350   5     80   20    3350  12
OKANAGAN     KEL       9    8     350   5     55   17    2750   8
CASTLEGAR    SPOK     34    8    1500   5     60   15    3500   9
CRANBROOK    SPOK     70   11    3950  12    100   15    3950  21
REVELSTOKE   KEL      27   11     600  11    100   14    1950  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   20   W   24
CRANBROOK             W   17   W   43

TODAY'S VENTING: GENERALLY POOR THIS MORNING RISING TO GOOD THIS
AFTERNOON.
EXCEPT GOOD THROUGHOUT AT CRANBROOK.

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   10     950  19    100   16    3950  17
PR. GEORGE   P.G.     33    9     900  14     99   13    1700  17
SMITHERS     P.G.     14    8     700   4     76   14    1400  12
WELLS GRAY   P.G.     20    6    1200  10    100   16    4000  17
FT NLSN      F.N.      9   10     400   0    100   18    2400  18
FT STJOHN    F.N.      9    9     700  22    100   14    1950  22

*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            NW  17   NW  15
SMITHERS              W    9   W   15

TODAY'S VENTING: POOR THIS MORNING RISING TO GOOD THIS AFTERNOON.

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     20   10     100  10    100   18    2000   8
FRASER VLY   QUIL     20    9      50  10    100   17    1750  10
SRN VRISL    QUIL      9    9       0   3    100   18    2050  12
CNTRL VRISL  QUIL      9   10      50   3    100   20    3050  14
NRN VRISL    HRDY     15   11     100   7     77   15    1100  10
TERRACE      ANT       9   11     250   2     47   15    1800   3
STEWART      ANT      11   11     150   1     35   15    1150   3

*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    SW  15   SW  13   VR   5
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     S   19   VR   5   VR   5

TODAY'S VENTING: POOR THIS MORNING RISING TO GOOD THIS AFTERNOON.
EXCEPT RISING TO FAIR AT TERRACE AND STEWART.

VENTING FOR TUESDAY: GOOD


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


END/
$$$$^^