FPCN39 CWLW 221336
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 22 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      45   17     850   6     71   22    1750   6
KAMLOOPS     KEL      62   19    1600   6    100   26    3350  10
OKANAGAN     KEL      37   16     950   5     96   24    2250   8
CASTLEGAR    SPOK     66   15    1300  10     76   20    1550   9
CRANBROOK    SPOK     47   14    1450   9     71   17    1900   9
REVELSTOKE   KEL      43   17    1250   5     93   23    2250   8

*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    NW  11   N   19   N   24
CRANBROOK             VR   5   E   13

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         2300 m         23 C
SPOKANE         1500 m         19 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.     95   16    1950  15    100   24    3950  12
PR. GEORGE   P.G.     54   15    1050  17    100   23    3700  13
SMITHERS     P.G.     34   15     800  11    100   20    1900  14
WELLS GRAY   P.G.     81   15    1700  16    100   24    4000  12
FT NLSN      F.N.     24   19     700   5    100   24    3400  13
FT STJOHN    F.N.      9   15     700   5    100   22    3700  13

*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            VR   5   S   11
SMITHERS              SW  19   S   11

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1700 m         20 C
FT. NELSON       800 m         21 C

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     70   13     900  11     98   18    1650  10
FRASER VLY   QUIL     80   14    1050  11     99   19    1700  10
SRN VRISL    QUIL     38   12     500   7     94   18    1650   9
CNTRL VRISL  QUIL     73   14    1000  10     91   17    1550   9
NRN VRISL    HRDY     17   12     150   6     75   13    1500   9
TERRACE      ANT     100   11    1500  18    100   13    1900  19
STEWART      ANT     100   12    1250  15    100   13    1500  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   13   VR   5   VR   5
PORT HARDY   VR   5   S   17   S   20
SANDSPIT     SW  11   SW  19   SW  35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1700 m         18 C
PORT HARDY      NO INVERSION
ANNETTE         NO INVERSION

TODAY'S VENTING: FAIR TO 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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