FPCN39 CWLW 141348
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 SATURDAY 14 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   11     200   0     65   21    1350   6
KAMLOOPS     KEL       9   15     500   0     87   24    2450   6
OKANAGAN     KEL       9   16     550   0     81   23    2200   6
CASTLEGAR    SPOK     45   18    1200   6    100   22    3500   9
CRANBROOK    SPOK      9   10     950  11    100   20    3950  10
REVELSTOKE   KEL       9   14     500   0     61   19    1500   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   15   W   17
CRANBROOK             VR   5   W   11

TODAY'S VENTING: GOOD THIS AFTERNOON.




VENTING FOR SUNDAY: 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.      9   12     950  16    100   23    3950  13
PR. GEORGE   P.G.     16   14     850   5    100   22    3700  11
SMITHERS     P.G.     10   12     650   1     55   19    2200  10
WELLS GRAY   P.G.      9   12     800   2    100   23    4000  13
FT NLSN      F.N.      9   13     400   3     80   22    3500   5
FT STJOHN    F.N.      9   12     700  25    100   23    2550  23

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   W   26
SMITHERS              S   26   S   26

TODAY'S VENTING: GOOD BY AFTERNOON.




VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     25   15     800   7     60   20    1100   8
FRASER VLY   QUIL     20   15     600   4     65   21    1200  10
SRN VRISL    QUIL     15   13     250   3     57   20     900   9
CNTRL VRISL  QUIL     11   13     700   1     50   20     900   5
NRN VRISL    HRDY     18   13     300   4     52   17     800   7
TERRACE      ANT      11   14     250  29    100   20    1650  20
STEWART      ANT      36   13     200  17    100   20    1400  20

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   W   22   NW  15
PORT HARDY   S   30   SW  30   SW  28
SANDSPIT     W   15   W   22   W   33

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON EXCEPT FAIR CENTRAL AND
NORTH VANCOUVER ISLAND.




VENTING FOR SUNDAY: GOOD




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

END/TCS