FPCN39 CWLW 081433
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 Tuesday 8 July 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      75   19     950  20     77   23    2300  20
KAMLOOPS     KEL      36   19    1150   4     71   23    2200  15
OKANAGAN     KEL      36   19    1150   4     70   23    2200  12
CASTLEGAR    SPOK     31   18     800   8     72   23    2250  11
CRANBROOK    SPOK     46   19    1200  16    100   22    2200  17
REVELSTOKE   KEL       9   15     450   0     83   18    2250  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  24   SW  48
CRANBROOK             SW  19   SW  57

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1400 m         21 C
SPOKANE         1500 m         22 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY:  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   16    1800  12    100   20    2950  15
PR. GEORGE   P.G.     98   15    1400  14    100   18    2600  15
SMITHERS     P.G.      9   14     500   9    100   17    2400  15
WELLS GRAY   P.G.    100   18    4000  12    100   21    4000  15
FT NLSN      F.N.     31   14     500  12     61   16    1500  10
FT STJOHN    F.N.    100   15    1550  10    100   20    2600  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  26   SW  33
SMITHERS              SW  24   SW  33

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         19 C
FT. NELSON       600 m         15 C

TODAY'S VENTING:  GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     19   16     150  11     75   18     650  15
FRASER VLY   QUIL     48   17     350  15     91   19     900  15
SRN VRISL    QUIL     31   17     250  10     80   19     750  15
CNTRL VRISL  QUIL      9   16      50   8     84   19     800  16
NRN VRISL    HRDY     14   15     100   6     53   17     500  11
TERRACE      ANT      66   14     800  13    100   17    1500  15
STEWART      ANT      44   15     600   7     85   17    1000  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  24   SW  33   SW  43
PORT HARDY   SW  24   SW  28   SW  37
SANDSPIT     S   44   SW  44   SW  41

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY       100 m         15 C
ANNETTE         NO INVERSION

TODAY'S VENTING:  GOOD

VENTING FOR WEDNESDAY: GOOD


VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR



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

END/JMS