FPCN39 CWLW 011346
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 MONDAY 1 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      28   19     700   4    100   24    2400  11
KAMLOOPS     KEL      43   19    1250   4    100   24    3350  14
OKANAGAN     KEL      11   16     550   1    100   24    3350  14
CASTLEGAR    SPOK     41   15     850  11     82   21    1450  12
CRANBROOK    SPOK     15   12     700   7    100   18    2150  14
REVELSTOKE   KEL      17   16     650   4     86   20    2000   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW  11   NW  24   NW  33
CRANBROOK             VR   5   NW  19

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         400  m         14 C
SPOKANE         400  m         16 C

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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.     75   10    3950   7     90   20    3950  12
PR. GEORGE   P.G.     45   12    1350   8    100   19    3700  15
SMITHERS     P.G.     35   12    1150   8    100   22    3500  12
WELLS GRAY   P.G.     40   12    4000  10    100   20    4000  15
FT NLSN      F.N.     39   12    2200   8     65   19    2300  12
FT STJOHN    F.N.     42   13    2400   8     70   20    2600  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            N   28   N   39
SMITHERS              NW  17   N   39

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         16 C
FT. NELSON      1500 m         12 C

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     35   16     750   4     65   19     900   7
FRASER VLY   QUIL     36   16     750   4     72   22    1350   7
SRN VRISL    QUIL     35   16     750   4     56   21    1050   6
CNTRL VRISL  QUIL     42   18     800   5     73   24    1450   6
NRN VRISL    HRDY     40   13    1050   8     70   16    1250   8
TERRACE      ANT      42   12    1600   8     90   24    3200  12
STEWART      ANT      45   14    1600   9     82   24    2000  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  17   N   20   N   30
PORT HARDY   N   31   N   35   N   37
SANDSPIT     NW  54   N   46   N   54

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1800 m         24 C
PORT HARDY      1700 m         23 C
ANNETTE         2000 m         21 C

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD.

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


END/MWSO