FPCN39 CWLW 051434
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Thursday 5 June 1997 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      90   17    1700  11    100   23    3200  10
KAMLOOPS     KEL      98   17    1850  11    100   23    3350  10
OKANAGAN     KEL      90   17    1850  11    100   22    3350  10
CASTLEGAR    SPOK     90   16    2000   8    100   22    3500   7
CRANBROOK    SPOK     90   15    2600   8    100   18    3950   8
REVELSTOKE   KEL      90   13    1400   8    100   19    2350  11


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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         NO INVERSION
SPOKANE         1150 m         14 C

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD

VENTING OUTLOOK SATURDAY THROUGH MONDAY: GOOD IN THE AFTERNOONS.


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.     70   12    1900  11    100   18    3950  14
PR. GEORGE   P.G.     83   13    1750  11    100   18    3700  13
SMITHERS     P.G.     63   12    1100   7    100   17    2350  10
WELLS GRAY   P.G.     70   10    2000  11    100   18    4000  14
FT NLSN      F.N.     93   14     950  26    100   17    1400  26
FT STJOHN    F.N.    100   15    3700  19    100   20    3700  19


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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW   9   SW  15
SMITHERS              SW  11   SW  15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      NO INVERSION
FT. NELSON      1400 m         14 C

TODAY'S VENTING: GENERALLY GOOD.

VENTING FOR FRIDAY: GOOD

VENTING OUTLOOK SATURDAY THROUGH MONDAY: GOOD IN THE AFTERNOONS.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     69   15    1650   5     88   19    2350   6
FRASER VLY   QUIL     78   16    1900   6     89   20    2400   6
SRN VRISL    QUIL     47   14     950   5     87   19    2350   6
CNTRL VRISL  QUIL     27   13     550   4     86   18    2300   6
NRN VRISL    HRDY     28   11     250   4    100   15    1900  11
TERRACE      ANT     100   13    1650  18    100   18    2350  19
STEWART      ANT      88   12     950  14    100   18    2100  16


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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   15   SW  15   SW  17
PORT HARDY   SW  15   S   19   S   24
SANDSPIT     S   39   S   35   S   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       275 m         12 C
PORT HARDY       450 m         13 C
ANNETTE         NO INVERSION

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD

VENTING OUTLOOK SATURDAY THROUGH MONDAY: GOOD IN THE AFTERNOONS.


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

END/PLJ