FPCN39 CWLW 261432
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 26 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       9   17     200   0     79   21    2050  10
KAMLOOPS     KEL       9   17     950   0     79   23    3350  10
OKANAGAN     KEL       9   18    1250   0     79   23    3350  10
CASTLEGAR    SPOK     34   17     850   8     80   22    1600  10
CRANBROOK    SPOK     23   16    1050  11    100   21    3950  11
REVELSTOKE   KEL       9   17    1250   0     79   21    3450  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  22
CRANBROOK             W   11   W   30

           INVERSION HT    BREAKTHRU TEMP
KELOWNA        NO INVERSION
SPOKANE          900 m         18 C

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: 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.     38   13    1450   6    100   20    3950   9
PR. GEORGE   P.G.     47   15    1400   6    100   20    3700   9
SMITHERS     P.G.     21   13     800   5     59   18    1600   6
WELLS GRAY   P.G.     90   15    2650   8    100   21    4000   9
FT NLSN      F.N.     30   17     600  11     76   21    1350  10
FT STJOHN    F.N.      9   15     700  10     89   20    2500   8

*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  24   SW  30
SMITHERS              W   15   W   30

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1700 m         18 C
FT. NELSON      1100 m         20 C

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   15    1200  17     90   18    2250  10
FRASER VLY   QUIL    100   15    1150  17     90   18    2250  10
SRN VRISL    QUIL     67   14     650  12     90   17    1800  11
CNTRL VRISL  QUIL     15   12     150   6     91   17     400  10
NRN VRISL    HRDY     15   12     200   4     90   15    1450  12
TERRACE      ANT      91   13    1050  18     90   17    1700  11
STEWART      ANT      48   13     400  12     90   17    1350  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
VANCOUVER    S   28   SW  39   SW  46
PORT HARDY   S   22   S   24   S   22
SANDSPIT     SW   9   VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY       200 m         12 C
ANNETTE         NO INVERSION

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD.



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

END/JMS