FPCN39 CWLW 071431
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 Monday 7 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      28   21    1550   2     83   27    2900   4
KAMLOOPS     KEL      21   19    1400   1     80   26    2900   4
OKANAGAN     KEL      12   17     650   1     80   26    2900   4
CASTLEGAR    SPOK     39   18     850  10    100   24    2600  16
CRANBROOK    SPOK     62   18    1400  15    100   27    3950  18
REVELSTOKE   KEL      11   16     650   1     77   22    2800   4

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  19   SW  33
CRANBROOK             W   11   W   31

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m         17 C
SPOKANE          900 m         19 C

TODAY'S VENTING: THE AIRMASS REMAINS UNSTABLE ENOUGH AT LOW
LEVELS THAT THE VENTING WILL BECOME GOOD THIS AFTERNOON.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD THROUGH THE PERIOD.




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.     99   13    1800  20    100   19    3950  23
PR. GEORGE   P.G.     65   14    1250  14    100   18    3700  20
SMITHERS     P.G.      9   11     500   2     95   17    1750  13
WELLS GRAY   P.G.    100   15    4000  23    100   20    4000  23
FT NLSN      F.N.     31   18     800   6     87   22    1800   9
FT STJOHN    F.N.     33   16    1000   9    100   21    2450  15

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  30   SW  35
SMITHERS              S   26   S   35

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         17 C
FT. NELSON       750 m         19 C

TODAY'S VENTING: THE AIRMASS REMAINS UNSTABLE ENOUGH AT LOW
LEVELS THAT THE VENTING WILL BECOME GOOD BY THIS AFTERNOON.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD THROUGH THE PERIOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     67   17    1150   8     75   20    1250  10
FRASER VLY   QUIL     66   17    1100   8     75   21    1250  10
SRN VRISL    QUIL     33   16     700   4     75   21    1250  10
CNTRL VRISL  QUIL     34   16     700   4     75   19    1200  10
NRN VRISL    HRDY      9   14       0   7     60   16     650  10
TERRACE      ANT     100   14    1000  23    100   18    2050  24
STEWART      ANT      76   15     650  16    100   18    1600  21

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   20   SW  39   SW  59
PORT HARDY   S   56   S   63   S   63
SANDSPIT     S   37   S   39   S   43

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       250 m         15 C
PORT HARDY       150 m         15 C
ANNETTE          100 m         14 C

TODAY'S VENTING: A FRONTAL SYSTEM WILL GIVE ENOUGH MIXING
FOR GOOD VENTING.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD THROUGH THE PERIOD.




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

END/JDG