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 WEDNESDAY 23 JUNE 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       9   16     500   0     80   21    3200   4
KAMLOOPS     KEL      18   16     850   2     80   21    3350   4
OKANAGAN     KEL      49   18    2250   3     80   24    3350   4
CASTLEGAR    SPOK     41   15     850  10    100   21    3500  16
CRANBROOK    SPOK     77   14    1550  17    100   20    3950  17
REVELSTOKE   KEL       9   13     450   0     47   17    2250   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   17   W   22
CRANBROOK             W   15   W   31

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.    100   11    2400  17    100   16    3950  16
PR. GEORGE   P.G.     97   11    1550  19    100   14    2550  16
SMITHERS     P.G.     12   10     750   2    100   14    2100  13
WELLS GRAY   P.G.     11    9     600   3    100   16    4000  16
FT NLSN      F.N.    100   11    1350  19    100   15    1850  23
FT STJOHN    F.N.    100   12    1850  26    100   17    2600  24

*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   19   W   22
SMITHERS              SW  11   SW  22

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     65   15     750  14    100   19    1400  16
FRASER VLY   QUIL     55   15     750  14    100   18    1350  16
SRN VRISL    QUIL     62   15     650  11     95   19    1200  13
CNTRL VRISL  QUIL     62   15     700  11     91   18    1100  13
NRN VRISL    HRDY     14   12     200   4     50   15     700   7
TERRACE      ANT      86   11    1050  16    100   15    1900  14
STEWART      ANT      76   12     800  13    100   15    1500  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SW  17   SW  24
PORT HARDY   S   17   S   24   S   28
SANDSPIT     VR   5   S    9   S   17

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD

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


END/RH
$$$$^^