FPCN39 CWLW 231400
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 23 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      31   20     900   3    100   30    2400  15
KAMLOOPS     KEL      32   19    1000   4     60   30    2450   4
OKANAGAN     KEL      15   17     700   2     55   29    2500   3
CASTLEGAR    SPOK     15   17    1000   5     55   29    2700   3
CRANBROOK    SPOK      9   17     950   8     55   27    2950   3
REVELSTOKE   KEL      13   16     700   2     55   27    2400   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   N    9

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

VENTING FOR MONDAY: FAIR TO 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.     60   15    1500  15     60   25    2150  10
PR. GEORGE   P.G.     60   17    1350  15     60   21    1900  10
SMITHERS     P.G.      9   12     500   0     60   17    2400   9
WELLS GRAY   P.G.    100   12    1600  17     60   25    2200  10
FT NLSN      F.N.     10   12     500   1    100   16    3400  12
FT STJOHN    F.N.    100   14    3700  14    100   18    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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  19   W   43
SMITHERS              SW  41   SW  43

TODAY'S VENTING: GOOD.

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     20   16     200   9     44   20     400  14
FRASER VLY   QUIL     20   21     400   6     45   30     650   6
SRN VRISL    QUIL      9   15     150   0     36   20     350   9
CNTRL VRISL  QUIL     18   17     250   5     50   26     600   9
NRN VRISL    HRDY     11   13     200   1     23   19     750   2
TERRACE      ANT      ##   ##     ###  ##    100   13     550  49
STEWART      ANT      23   10      50  23     94   13     450  34

*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    E   11   E   17   SE  13
PORT HARDY   VR   5   S   24   S   39
SANDSPIT     S   67   S   82   S  100

TODAY'S VENTING: FAIR IN THE SOUTH. GOOD IN THE NORTH.

VENTING FOR MONDAY: FAIR TO GOOD.




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


END/MWSO
$$$$^^