FPCN39 CWLW 061430
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 Friday 6 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      30   17    1000   3    100   24    3200   7
KAMLOOPS     KEL      30   16    1200   3    100   24    3350   7
OKANAGAN     KEL      24   15     950   3    100   23    3350   7
CASTLEGAR    SPOK     24   15     850   5     86   23    3500   4
CRANBROOK    SPOK     47   14    1550   8     78   21    3950   4
REVELSTOKE   KEL      14   13     650   2     80   19    3100   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   S   19
CRANBROOK             VR   5   SW  15

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          650 m         14 C
SPOKANE          850 m         15 C

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

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD DURING THE AFTERNOONS.




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.     69   12    2000   8    100   18    3950  12
PR. GEORGE   P.G.     44   11    1150   9    100   17    3700  11
SMITHERS     P.G.     27   11     900   5     78   16    1950   7
WELLS GRAY   P.G.     75   12    2150   9    100   19    4000  12
FT NLSN      F.N.     53   14    1150   7     93   20    2650   7
FT STJOHN    F.N.     65   14    1750   7    100   20    3700   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   S   30
SMITHERS              S   26   S   30

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       900 m         13 C
FT. NELSON       650 m         13 C

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

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD DURING THE AFTERNOONS.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     41   14     750   5     82   18    1650   7
FRASER VLY   QUIL     29   13     550   5     82   18    1600   7
SRN VRISL    QUIL     21   13     350   4     79   18    1550   7
CNTRL VRISL  QUIL     36   14     650   5     69   17    1450   6
NRN VRISL    HRDY     29   13     200  12    100   15    1550  17
TERRACE      ANT     100   11    1150  43    100   14    1800  45
STEWART      ANT     100   13    1150  34    100   14    1400  36

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S    9   SW  17   SW  24
PORT HARDY   S   24   S   31   SW  39
SANDSPIT     S   44   S   46   S   48

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       700 m         13 C
PORT HARDY       200 m         13 C
ANNETTE         NONE           ## C

TODAY'S VENTING: IN THE SOUTH THE VENTING WILL BECOME GOOD THIS
AFTERNOON WITH DAYTIME HEATING. IN THE NORTH A STRONG LOW LEVEL
FLOW WILL PROVIDE GOOD VENTING ALREADY THIS MORNING.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD DURING THE AFTERNOONS.




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

END/JDG