FPCN39 CWLW 231341
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 23 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      27   23     900   3     69   31    1650   9
KAMLOOPS     KEL      27   23    1050   3     68   30    1750   4
OKANAGAN     KEL      11   19     550   1     61   28    1450   3
CASTLEGAR    SPOK     26   21     850   6     67   30    1700   7
CRANBROOK    SPOK      9   20     950   8     81   30    2600   7
REVELSTOKE   KEL      10   17     550   1     47   25    1650   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
PENTICTON    VR   5   SW  17   SW  30
CRANBROOK             SW  11   SW  26

TODAY'S VENTING:POOR BECOMING GOOD LATE IN THE AFTERNOON.


VENTING FOR TUESDAY: FAIR


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.     52   18    1950   5    100   23    3950  11
PR. GEORGE   P.G.     15   15     800   6     58   19    1650   6
SMITHERS     P.G.      9   13     500   2     17   16     750   3
WELLS GRAY   P.G.      9   15    1000   3    100   22    4000  11
FT NLSN      F.N.      9   15     400   4    100   21    3400  13
FT STJOHN    F.N.     44   15    1200   9    100   20    3700  14

*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            SW  24   W   39
SMITHERS              SW  17   W   39

TODAY'S VENTING:GOOD EXCEPT POOR IN THE BULKELY VALLEY


VENTING FOR TUESDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     31   18     350   9     44   23     550   9
FRASER VLY   QUIL     34   20     400   9     70   28     900  10
SRN VRISL    QUIL     29   18     350   7     52   25     650   8
CNTRL VRISL  QUIL     29   18     350   7     39   23     550   7
NRN VRISL    HRDY     10   14     150   1     24   18     650   3
TERRACE      ANT      55   14    1650   4     67   18    2200   4
STEWART      ANT      33   13     600   5     63   18    1950   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SW  13   SW  30
PORT HARDY   VR   5   W   11   SW  28
SANDSPIT     S   17   SW  19   SW  33

TODAY'S VENTING: FAIR TO GOOD ON THE SOUTH AND NORTH COAST. POOR
ON THE CENTRAL COAST AND NORTHERN VANCOUVER ISLAND.


VENTING FOR TUESDAY: FAIR




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


END/lm