FPCN39 CWLW 221332
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 22 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.

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      32   21     900   3     90   29    2650   6
KAMLOOPS     KEL      31   20    1050   4    100   29    3350   6
OKANAGAN     KEL      16   18     650   3    100   28    3350   6
CASTLEGAR    SPOK     33   19     850   7     83   28    2650   6
CRANBROOK    SPOK      9   18     950   1     99   29    3950   6
REVELSTOKE   KEL      14   17     650   3     85   24    2150   4

*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   13
CRANBROOK             VR   5   W   13

TODAY'S VENTING:GOOD BY MID MORNING.

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.     79   13     800   3    100   22    3950  17
PR. GEORGE   P.G.     26   13     900   9    100   18    2200  14
SMITHERS     P.G.     13   13     750   2     79   17    1800   8
WELLS GRAY   P.G.     60    8    2000   4    100   21    4000  17
FT NLSN      F.N.     14   15     550   3     96   21    2000  10
FT STJOHN    F.N.     15   16     800   5    100   22    3700  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            SW  19   W   37
SMITHERS              S   31   SW  37

TODAY'S VENTING:BECOMING GOOD IN THE AFTERNOON.


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     48   18     600   9     61   23    1100   7
FRASER VLY   QUIL     54   19     700   9     77   27    1700   6
SRN VRISL    QUIL     34   17     400   7     62   24    1150   6
CNTRL VRISL  QUIL     40   18     550   7     67   25    1350   6
NRN VRISL    HRDY     10   14     100   1     47   18     850   6
TERRACE      ANT     100   14    1150  10     90   18    1900  13
STEWART      ANT      50   14     500  10     90   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   SW   9
PORT HARDY   S   13   S   28   SW  35
SANDSPIT     S   31   S   43   SW  56

TODAY'S VENTING:GENERALLY GOOD IN THE AFTERNOON.


VENTING FOR MONDAY: GOOD


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


END/lm