FPCN39 CWLW 191400
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 WEDNESDAY 19 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      65   13    1250   7    100   17    2800   7

KAMLOOPS     KEL      82   13    2250   6    100   19    3350   7

OKANAGAN     KEL      21   10     650   4    100   18    3350   7

CASTLEGAR    SPOK     48   11     950  10    100   17    2600  15

CRANBROOK    SPOK    100   10    2050  16    100   16    3950  18

REVELSTOKE   KEL      65   11    1550   7     99   16    2950   7


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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   S   15
CRANBROOK             VR   5   SW  13

TODAY'S VENTING: GENERALLY GOOD DUE TO MODERATE INSTABILITY WITH
DAYTIME HEATING.



VENTING FOR THURSDAY: 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.     86    8    2050  11    100   14    3950  10

PR. GEORGE   P.G.     91   10    1950  11    100   14    3700  10

SMITHERS     P.G.     34    8     900   7    100   14    2550  10

WELLS GRAY   P.G.     ##   ##     ###  ##    100   15    4000  10

FT NLSN      F.N.     62   10    1050  11    100   15    3400   8

FT STJOHN    F.N.     74    8    1350  15    100   13    3700   9


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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   SW  15
SMITHERS              S   13   S   15

TODAY'S VENTING: GENERALLY GOOD DUE TO MODERATE INSTABILITY WITH
DAYTIME HEATING.




VENTING FOR THURSDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   11    1300  18    100   14    2050  18

FRASER VLY   QUIL     98   10    1000  18    100   15    2150  18

SRN VRISL    QUIL     33   10     900   3    100   15    2100  11

CNTRL VRISL  QUIL     39   11    1150   3    100   15    2100  11

NRN VRISL    HRDY     60    9     600  11     89   11    1350  10

TERRACE      ANT     100   10    1300  25    100   13    2050  25

STEWART      ANT     100   10     950  19    100   13    1400  21


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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S   17   S   30
PORT HARDY   S   19   S   28   S   24
SANDSPIT     S   39   S   39   S   39

TODAY'S VENTING: GENERALLY GOOD DUE TO MODERATE INSTABILITY WITH
DAYTIME HEATING.




VENTING FOR THURSDAY: GOOD




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


END/TCS
$$$$^^