FPCN39 CWLW 201335
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 20 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      94   19    3200   5     94   26    3200   5
KAMLOOPS     KEL      94   20    3350   5     94   26    3350   5
OKANAGAN     KEL      94   19    3350   5     94   26    3350   5
CASTLEGAR    SPOK     28   18    1200   3     86   25    3500   4
CRANBROOK    SPOK     29   15    1450   4     92   22    3950   5
REVELSTOKE   KEL      94   16    3450   5     94   23    3450   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   N   11   N   17
CRANBROOK             VR   5   N   11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         22 C
SPOKANE         1500 m         18 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.      9   15     950  12    100   24    3950   6
PR. GEORGE   P.G.     23   16     850   8    100   25    3700   7
SMITHERS     P.G.     24   17     850   5    100   25    3500   6
WELLS GRAY   P.G.      9   17    1000  12    100   25    4000   6
FT NLSN      F.N.     26   20     600   8    100   27    3400   8
FT STJOHN    F.N.      9   17     700   8    100   23    3700   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  13   NW   9
SMITHERS              W   15   NW   9

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         24 C
FT. NELSON      1500 m         25 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     82   18     950  13     35   21    1000  13
FRASER VLY   QUIL     79   17     900  13     75   22    1500  13
SRN VRISL    QUIL      9   17     850   0     35   21    1000   0
CNTRL VRISL  QUIL      9   20    1000   0     75   26    1500  11
NRN VRISL    HRDY     61   14     750  10     35   17    1000  10
TERRACE      ANT      67   20    1300   7    100   28    3200   7
STEWART      ANT      65   20     950   8    100   28    2450   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
VANCOUVER    VR   5   NE  15   NE  19
PORT HARDY   N   30   N   20   N   15
SANDSPIT     N   44   N   39   NW  31

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1500 m         25 C
PORT HARDY      1800 m         27 C
ANNETTE         1600 m         26 C

TODAY'S VENTING: GENERALLY FAIR EXCEPT LOCALLY GOOD INLAND.

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR

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


END/JL/KJ