FPCN39 CWLW 301339
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 SATURDAY 30 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      88   20    1550  10    100   26    2150  10
KAMLOOPS     KEL      86   19    1650  10    100   26    2350  10
OKANAGAN     KEL      67   16    1000  12     99   24    2150   9
CASTLEGAR    SPOK     77   15    1650   9    100   20    2800  10
CRANBROOK    SPOK     90   13    2150  12    100   18    3950  11
REVELSTOKE   KEL      80   17    1500  10    100   25    2350  10

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  13   N   19
CRANBROOK             VR   5   N    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          550 m         15 C
SPOKANE         1700 m         14 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.     33   17    1200  10    100   24    3950  18
PR. GEORGE   P.G.     45   19    1100  10    100   25    3700  16
SMITHERS     P.G.     30   18     850   7    100   26    3500  15
WELLS GRAY   P.G.     59   18    1650  10    100   24    4000  18
FT NLSN      F.N.     45   18     900   8     81   22    1500  10
FT STJOHN    F.N.     25   18     900   8     68   23    1500  10

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  17   NW  15
SMITHERS              W   20   W   15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1050 m         21 C
FT. NELSON      1000 m         20 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     76   15    1100  10     94   19    1600  10
FRASER VLY   QUIL     79   16    1150  10     98   21    1750  10
SRN VRISL    QUIL     72   16    1150   8     88   19    1550   9
CNTRL VRISL  QUIL     69   15    1050   8     88   19    1550   9
NRN VRISL    HRDY     24   13     550   3     29   17     700   3
TERRACE      ANT      20   18     750   2     52   25    1300   5
STEWART      ANT      14   17     350   2     41   25    1150   3

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   11   N   17   N   17
PORT HARDY   NW  11   NW  13   N    9
SANDSPIT     NW  15   W   13   W   13

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1800 m         23 C
PORT HARDY      1500 m         24 C
ANNETTE         1200 m         27 C

TODAY'S VENTING: GOOD SOUTH  FAIR TO POOR NORTH.

VENTING FOR SUNDAY: GOOD TO FAIR

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD

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


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