FPCN39 CWLW 301432
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 Saturday 30 August 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   19     700   0     83   25    3300  18
KAMLOOPS     KEL       9   18     800   0     71   25    3350  10
OKANAGAN     KEL       9   17     650   0     71   25    3350  10
CASTLEGAR    SPOK     24   18     900   4     63   26    3350   7
CRANBROOK    SPOK      9   15     950   6    100   23    3950  13
REVELSTOKE   KEL       9   15     550   0     61   20    2900   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   SW  17
CRANBROOK             VR   5   SW  20

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1900 m         22 C
SPOKANE         1400 m         22 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD.




CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   KEL      25   10    1000   3     86   18    2200   8
PR. GEORGE   KEL       9   11     700   0     86   19    2500   8
SMITHERS     ANT      37   15    1850   8     84   19    2100   8
WELLS GRAY   KEL       9   13    1000   1     70   19    4000  10
FT NLSN      F.N.     35   12     750  10     72   15    2850  12
FT STJOHN    F.N.     61   12    1850   6    100   16    2800  12

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   11   W   15
SMITHERS              NW  11   NW  15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      MISSING
FT. NELSON       700 m         12 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     14   18     250   5     50   22    1550   9
FRASER VLY   QUIL     14   18     250   5     50   24    1550   9
SRN VRISL    QUIL     10   17     200   4     52   22    1500   8
CNTRL VRISL  QUIL     18   18     200   4     53   22    1550   8
NRN VRISL    HRDY     17   14     200   5     57   19    1500  10
TERRACE      ANT      10   16     150   3     96   22    2100   8
STEWART      ANT      11   16     150   3     96   22    2050   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S    9   S   15
PORT HARDY   VR   5   VR   5   E   13
SANDSPIT     N   26   N   19   N   17

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1200 m         20 C
PORT HARDY      1400 m         21 C
ANNETTE          900 m         19 C

TODAY'S VENTING: FAIR SOUTH TO GOOD NORTH.

VENTING FOR SUNDAY: FAIR.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD.


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

END/JMS