FPCN39 CWLW 241400
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 MAY 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      20   21     750   2    100   31    1700  15
KAMLOOPS     KEL      29   22    1000   3     95   32    2550   6
OKANAGAN     KEL      16   19     700   2     90   30    1750   8
CASTLEGAR    SPOK     23   19     800   5     89   30    2450   7
CRANBROOK    SPOK      9   19     950   4    100   28    3950  10
REVELSTOKE   KEL      13   17     600   2     80   28    1650   8

*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  28
CRANBROOK             S    9   S   20

TODAY'S VENTING: BECOMING GOOD BY THIS 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.     45   19    1100  25    100   25    2350  23
PR. GEORGE   P.G.     20   15     800  10     62   22    1200  14
SMITHERS     P.G.     15   12     650   6     27   16     800   7
WELLS GRAY   P.G.     15    8    2000  15    100   25    4000  24
FT NLSN      F.N.      9   14     400   0      9   19     700   0
FT STJOHN    F.N.     31   17     900  11    100   24    3700  17

*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  31   SW  48
SMITHERS              SW  35   S   48

TODAY'S VENTING: RISING TO FAIR TO GOOD THIS AFTERNOON. EXCEPT
REMAINING POOR AT FORT NELSON AND SMITHERS.

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     40   17     800   4     70   22    2000   6
FRASER VLY   QUIL     25   21     400   6     90   30    2200   8
SRN VRISL    QUIL     14   16     750   4     72   20    1800   4
CNTRL VRISL  QUIL     15   19     200   4     90   27    1500   6
NRN VRISL    HRDY     13   12     200   3     75   15     750  10
TERRACE      ANT      50   12     950   5     100  15    1550  17
STEWART      ANT      25   11     250   7     92   15    1150  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
VANCOUVER    SW  15   SW  24   SW  33
PORT HARDY   W   20   SW  33   SW  56
SANDSPIT     SW  30   SW  39   SW  43

TODAY'S VENTING: POOR EXCEPT FAIR AT VANCOUVER RISING TO GOOD MOST
AREAS THIS AFTERNOON.




VENTING FOR TUESDAY: FAIR




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


END/
$$$$^^