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 Saturday 5 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      12   22     500   1     89   30    3400  15
KAMLOOPS     KEL      17   23     750   2     80   30    3600  11
OKANAGAN     KEL      15   22     650   2     80   30    3600  11
CASTLEGAR    SPOK     20   21     900   3     85   30    3450  11
CRANBROOK    SPOK      9   20     950   7     87   27    3050  11
REVELSTOKE   KEL      10   19     500   1     90   27    3350  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  30
CRANBROOK             VR   5   S   17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1700 m         29 C
SPOKANE         1500 m         29 C

TODAY'S VENTING: POOR BECOMING GOOD LATE AFTERNOON.

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   P.G.      9   19     950   6    100   26    3950   9
PR. GEORGE   P.G.     11   18     800   2     85   25    1450  11
SMITHERS     P.G.     13   19     800   2     90   25    1100  12
WELLS GRAY   P.G.      9   19    1000   6    100   27    4000   8
FT NLSN      F.N.     29   19     750   6     68   25    1700  11
FT STJOHN    F.N.     34   20    1100   7    100   27    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   S   28
SMITHERS              SW  20   SW  28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 m         26 C
FT. NELSON       900 m         22 C

TODAY'S VENTING: POOR BECOMING GOOD LATE IN THE AFTERNOON.

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     46   19     850   6     73   22    1950   9
FRASER VLY   QUIL     47   19     850   6     78   24    2050   9
SRN VRISL    QUIL     45   19     800   5     72   22    1950   9
CNTRL VRISL  QUIL     46   20     850   5     78   25    2150   9
NRN VRISL    HRDY     14   14     200   3     82   17    2300   9
TERRACE      ANT      11   20     450   1     87   23    2000   9
STEWART      ANT      11   17     100   3     88   23    1700   9

*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    SW  19   SW  22   SW  31
PORT HARDY   SW  17   S   28   S   35
SANDSPIT     SW  15   S   22   S   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1500 m         28 C
PORT HARDY      1500 m         24 C
ANNETTE          300 m         20 C

TODAY'S VENTING: FAIR BECOMING GOOD IN THE AFTERNOON.

VENTING FOR SUNDAY: GOOD.

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