FPCN39 CWLW 091409
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 9 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      34   21     500   8    100   31    3200  14
KAMLOOPS     KEL      21   19     500   8    100   30    3350  14
OKANAGAN     KEL      21   19     500   8    100   28    2350  14
CASTLEGAR    SPOK     32   16     800   9    100   26    3500   7
CRANBROOK    SPOK      9   13     950   9    100   22    3950   6
REVELSTOKE   KEL      13   18     500   8    100   28    2450  14

*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    VR   5   W   15   NW  26
CRANBROOK             VR   5   W   20

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          550 m         20 C
SPOKANE         1050 m         19 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.     89   19    1550  23    100   30    3950  23
PR. GEORGE   P.G.      9   18     700   9    100   29    3700  20
SMITHERS     P.G.     12   18     650   3    100   28    2250  17
WELLS GRAY   P.G.    100   20    1800  23    100   31    4000  23
FT NLSN      F.N.      9   19     400   7     24   27     600   7
FT STJOHN    F.N.      9   16     700   6    100   24    3700   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
PR. GEORGE            W   13   W   15
SMITHERS              W   15   SW  15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       700 m         21 C
FT. NELSON       680 m         31 C

TODAY'S VENTING: GOOD EXCEPT POOR LOWR ELEVATIONS NERN BC.

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     64   16     750  11     76   20    1050  10
FRASER VLY   QUIL     64   16     750  11     78   21    1100  10
SRN VRISL    QUIL     41   15     650   6     65   20    1000   8
CNTRL VRISL  QUIL     54   18     800   7     72   24    1200   8
NRN VRISL    HRDY     22   13     350   4     31   17     600   4
TERRACE      ANT      48   16    1150   5    100   23    3200  10
STEWART      ANT      36   16     900   3     79   23    2000   5

*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  15   W   17   SW  19
PORT HARDY   SW   9   SW  22   S   41
SANDSPIT     N   35   N   24   NW  15

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1280 m         26 C
PORT HARDY      1500 m         30 C
ANNETTE          400 m         21 C

TODAY'S VENTING: GOOD EXCEPT POOR NEAR THE OCEAN.

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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