FPCN39 CWLW 231328
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT TUESDAY 23 JUNE 1998 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      19   18     500   3    100   27    2500   8
KAMLOOPS     KEL      21   19     600   5    100   26    2550   8
OKANAGAN     KEL      16   18     600   3    100   26    2550   8
CASTLEGAR    SPOK     35   18     850   8     75   24    1550   9
CRANBROOK    SPOK      9   14     950  11    100   22    3950   8
REVELSTOKE   KEL      13   17     550   3     74   22    1750   7

*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    W    9   W   17   W   22
CRANBROOK             W    9   W   22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          640 m         18 C
SPOKANE         1200 m         20 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR BECOMING 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.     89   16    1800  16    100   22    3950  14
PR. GEORGE   P.G.     51   15    1100  12    100   21    3700  14
SMITHERS     P.G.      9   12     500   4     72   19    1300  11
WELLS GRAY   P.G.    100   17    4000  14    100   23    4000  14
FT NLSN      F.N.     45   17     550  29    100   23    3400  26
FT STJOHN    F.N.     10   15     700  32    100   23    3700  25

*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  28   SW  41
SMITHERS              W   31   W   41

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       700 m         14 C
FT. NELSON       600 m         19 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR BECOMING GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     56   15     900   7     78   20    1550   7
FRASER VLY   QUIL     59   16    1000   7     83   21    1750   7
SRN VRISL    QUIL     32   15     850   3     45   20    1400   3
CNTRL VRISL  QUIL     34   16     950   3     45   20    1450   3
NRN VRISL    HRDY      9   12       0   3     55   15     850   7
TERRACE      ANT      57   13    1100   7     70   19    1650   6
STEWART      ANT      55   14     800   7     73   19    1500   6

*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  17   W   17   W   22
PORT HARDY   SW  17   W   24   W   39
SANDSPIT     W   41   W   48   W   52

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       000 m         19 C
PORT HARDY       000 m         19 C
ANNETTE          000 m         19 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD

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


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