FPCN39 CWLW 211400
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 21 JULY 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      16   21     500   2     90   30    3550   2
KAMLOOPS     KEL      14   22     600   2     90   30    3400   2
OKANAGAN     KEL      14   22     600   2     90   30    2400   2
CASTLEGAR    SPOK     33   21     850   7    100   29    3500   6
CRANBROOK    SPOK      9   19     950   2    109   26    3950   6
REVELSTOKE   KEL      11   19     550   2     80   26    3400   2

*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   W   11   W    9
CRANBROOK             W   11   W   24

TODAY'S VENTING: GOOD.


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.     10   17     950  18    100   27    3950  19
PR. GEORGE   P.G.     40   18    1050  10    100   26    3700  17
SMITHERS     P.G.     13   17     750   2    100   24    2250  12
WELLS GRAY   P.G.     10   17     950  15    100   27    4000  19
FT NLSN      F.N.     11   20     500   2     77   26    1500   9
FT STJOHN    F.N.     41   22    1050  10    100   27    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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   28   W   37
SMITHERS              W   30   W   37

TODAY'S VENTING: GOOD.




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     10   16     700  10     40   21    1200  10
FRASER VLY   QUIL     10   16     700  10     80   25    1500  10
SRN VRISL    QUIL      9   16     500   0     40   21    1300   6
CNTRL VRISL  QUIL      9   19     900   0     80   25    3050   6
NRN VRISL    HRDY     30   15     400   6     51   18     800   6
TERRACE      ANT      67   18    1050  10     97   24    1800  10
STEWART      ANT      66   19     850   9     96   24    1600  10

*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   W    9   W    9
PORT HARDY   SW   9   S   22   SW  19
SANDSPIT     SW  20   SW  22   W   22

TODAY'S VENTING: FAIR NEAR THE WATER IN THE SOUTH RISING TO GOOD
INLAND. GOOD IN THE NORTH.




VENTING FOR THURSDAY: FAIR



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


END/GF
$$$$^^