FPCN39 CWLW 261337
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 FRIDAY 26 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      23   15     550   4    100   22    3200   6
KAMLOOPS     KEL      70   17    1750   6    100   25    3350   6
OKANAGAN     KEL      35   15     850   5    100   22    3350   6
CASTLEGAR    SPOK     67   13    1000  15    100   19    3500  13
CRANBROOK    SPOK     40   11    1100  20    100   17    3950  12
REVELSTOKE   KEL      30   14     850   5    100   18    3450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   NW  26   NW  37
CRANBROOK             NW  11   NW  35

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         NONE         NONE
SPOKANE         1200 m        15 C

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: 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.     74   14    3950   3     74   21    3950   3
PR. GEORGE   P.G.     20   14    1150   3     72   20    3700   3
SMITHERS     P.G.     20   14     950   3     72   18    3500   3
WELLS GRAY   P.G.     74   18    4000   3     74   28    4000   3
FT NLSN      F.N.    100   14    1400  26    100   20    2550  21
FT STJOHN    F.N.    100   13    1950  22    100   20    3700  18

*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            NW  13   NW  11
SMITHERS              NW  20   NW  11

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m        15 C
FT. NELSON      NONE          NONE

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     71   15    1350   7     99   20    2450   7
FRASER VLY   QUIL     27   13     550   4     82   17    1600   7
SRN VRISL    QUIL     19   13     400   3     81   18    1750   7
CNTRL VRISL  QUIL     20   13     450   3     87   19    2000   7
NRN VRISL    HRDY     56   14     700   9     85   18    1650   8
TERRACE      ANT      30   15     800   4     92   22    2650   6
STEWART      ANT      35   16     700   4     74   22    1900   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   28   W   28   NW  26
PORT HARDY   NW  22   NW  24   NW  24
SANDSPIT     NW  20   NW  19   NW  19

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      230 m         12 C
PORT HARDY      NONE          NONE
ANNETTE         1200 m        20 C

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD




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


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