FPCN39 CWLW 101455
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 WEDNESDAY 10 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       9   18     200   3     88   27    2300   6
KAMLOOPS     KEL      13   17     450   3     92   27    2700   6
OKANAGAN     KEL      15   19     550   3     92   27    2700   6
CASTLEGAR    KEL       9   18     500  10     89   25    2550   7
CRANBROOK    KEL      18   16    1150   4     95   23    3950   5
REVELSTOKE   KEL      12   18     550   3     80   24    2200   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   S    9
CRANBROOK             VR   5   NW  17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m         20 C
SPOKANE         MISSING

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: 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.    100   18    3950   9    100   26    3950  10
PR. GEORGE   P.G.     73   18    1750   9    100   27    3700  10
SMITHERS     P.G.      9   16     500   2    100   25    3500  10
WELLS GRAY   P.G.    100   18    4000   9    100   26    4000  10
FT NLSN      F.N.     76   19     750  28     70   24    2000  20
FT STJOHN    F.N.     11   16     700  27    100   23    2400  20

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   19   SW  17
SMITHERS              W   22   W   17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      NONE
FT. NELSON      1800 m         24 C

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     19   13     400   3     31   15     850   3
FRASER VLY   QUIL     24   14     600   3     38   16    1050   3
SRN VRISL    QUIL      9   14     500   0     46   18    1400   3
CNTRL VRISL  QUIL     23   15     750   2     98   20    3050   6
NRN VRISL    HRDY     20   14     700   2     50   18    1500   5
TERRACE      ANT     100   13    1250  18    100   18    2200  15
STEWART      ANT      92   13     900  16    100   18    1800  16

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   11   W   17   NW  15
PORT HARDY   NW  46   NW  44   NW  37
SANDSPIT     NW  44   NW  44   NW  46

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NONE
PORT HARDY      MISSING
ANNETTE         NONE

TODAY'S VENTING: FAIR TO POOR ALONG THE COAST. GOOD INLAND.

VENTING FOR THURSDAY: FAIR.

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR.

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

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