FPCN39 CWLW 061355
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 6 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      36   19     800   5     91   28    3200   5
KAMLOOPS     KEL      35   18     800   6     91   26    3350   5
OKANAGAN     KEL      27   16     700   5     79   24    2350   5
CASTLEGAR    SPOK     25   14     950   4     91   22    3500   5
CRANBROOK    SPOK     12   11    1000   4     96   19    3950   5
REVELSTOKE   KEL      25   16     750   5     77   23    2350   5

*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   VR   5   NW   9
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1800 m         22 C
SPOKANE         1000 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.     30   16    1400   5    100   23    3950  10
PR. GEORGE   P.G.     25   16     900   7    100   23    3700   9
SMITHERS     P.G.     24   17     900   5    100   26    3500   8
WELLS GRAY   P.G.    100   18    4000  10    100   24    4000  10
FT NLSN      F.N.     18   17     700   3     95   24    2650   7
FT STJOHN    F.N.      9   15     700   3     89   21    2650   7

*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            NE  17   NE  19
SMITHERS              N   11   NE  19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         19 C
FT. NELSON       800 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     25   15     650   3     39   20     950   4
FRASER VLY   QUIL     28   17     750   3     61   25    1550   5
SRN VRISL    QUIL     20   13     450   3     30   18     750   3
CNTRL VRISL  QUIL     28   17     700   3     60   25    1550   4
NRN VRISL    HRDY     57   13     650  10     64   17     750  10
TERRACE      ANT      60   18     800  11    100   28    2550  12
STEWART      ANT      61   19     750   9    100   28    2200  11

*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   NW  15   NW  20
PORT HARDY   NW  31   N   30   N   30
SANDSPIT     N   56   N   48   N   43

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1600 m         27 C
PORT HARDY      2000 m         29 C
ANNETTE         1700 m         23 C

TODAY'S VENTING: fair.

VENTING FOR SUNDAY: poor.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: poor.

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


END/dsl