FPCN39 CWLW 311356
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 SUNDAY 31 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      84   20    1300  20    100   24    1850  20
KAMLOOPS     KEL      89   21    1650  10    100   28    3350  10
OKANAGAN     KEL      74   18    1250  11    100   26    2050  11
CASTLEGAR    SPOK     29   17    1050   4     84   25    3500   4
CRANBROOK    SPOK     49   14    1750   6     84   21    3950   4
REVELSTOKE   KEL      81   19    1500  11    100   26    3450  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   28   W   41
CRANBROOK             W   15   W   41

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         2000 m         25 C
SPOKANE         2600 m         21 C

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     82   20    1700  15    100   25    3950  24
PR. GEORGE   P.G.     87   21    1550  15    100   24    3700  22
SMITHERS     P.G.     26   20     700  10    100   23    1600  18
WELLS GRAY   P.G.     68   18    1550  15    100   25    4000  24
FT NLSN      F.N.     33   14     600  12     73   21     850  18
FT STJOHN    F.N.     21   14     800  12     68   22    1100  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   48   NW  54
SMITHERS              W   39   NW  54

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1700 m         23 C
FT. NELSON      1100 m         23 C

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     34   16     850   4     39   19    1000   4
FRASER VLY   QUIL     33   16     850   3     42   20    1050   4
SRN VRISL    QUIL     30   16     850   3     38   20    1000   3
CNTRL VRISL  QUIL     30   16     850   3     37   19     950   3
NRN VRISL    HRDY     56   12     600  11     71   15     850  11
TERRACE      ANT      88   17    1500  11    100   22    3200  15
STEWART      ANT      75   16    1100   9    100   22    2100  12

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   19   NW  30   NW  35
PORT HARDY   NW  30   NW  41   NW  46
SANDSPIT     NW  39   NW  44   NW  52

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1000 m         20 C
PORT HARDY      1100 m         19 C
ANNETTE         1200 m         18 C

TODAY'S VENTING: FAIR SOUTH TO GOOD NORTH

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD

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


END/