FPCN39 CWLW 281326
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 THURSDAY 28 MAY 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      52   15    1650   4     99   22    3200   6
KAMLOOPS     KEL      99   16    3350   6     99   23    3350   6
OKANAGAN     KEL      63   14    2000   4     99   21    3350   6
CASTLEGAR    SPOK     28   12    1050   4    100   17    2750   9
CRANBROOK    SPOK     83   10    2150  10    100   14    3950  11
REVELSTOKE   KEL      99   15    3450   6     99   22    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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   SE  20
CRANBROOK             VR   5   E   13

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         NONE
SPOKANE         900 m         10 C

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD

VENTING OUTLOOK SATURDAY THRU MONDAY: 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.     51   15    1300  15    100   23    3950   7
PR. GEORGE   P.G.     79   20    1450  15    100   28    3700   9
SMITHERS     P.G.     74   19    1300  13    100   27    3500   9
WELLS GRAY   P.G.     62   18    1650  11    100   25    4000   7
FT NLSN      F.N.     ##   ##     ###  ##     ##   ##     ###  ##
FT STJOHN    F.N.     ##   ##     ###  ##     ##   ##     ###  ##

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   VR   5
SMITHERS              NW  15   NW   5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         21 C
FT. NELSON      #### m         ## C

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD

VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     41   12     750   5     53   15    1300   4
FRASER VLY   QUIL     46   13     950   5     73   19    2450   4
SRN VRISL    QUIL     36   12     600   5     59   17    1600   4
CNTRL VRISL  QUIL     51   14    1150   5     66   18    2050   4
NRN VRISL    HRDY     33   12     450   7     68   15    1300   6
TERRACE      ANT     100   19    1350  20    100   27    1950  17
STEWART      ANT     100   18    1200  19    100   27    1750  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   E   19   E   28
PORT HARDY   VR   5   E   13   E   19
SANDSPIT     VR   5   VR   5   E   11

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      250 m         10 C
PORT HARDY      NONE
ANNETTE         NONE

TODAY'S VENTING: GOOD


VENTING FOR FRIDAY: GOOD


VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD




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


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