FPCN39 CWLW 061335
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 6 JULY 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      24   22     500   5    100   32    2550   9
KAMLOOPS     KEL      28   21     650   7    100   30    2500   9
OKANAGAN     KEL      15   20     450   5    100   30    2500   9
CASTLEGAR    SPOK     15   21     500   5     90   29    2300   7
CRANBROOK    SPOK     16   20     550   5     90   28    2200   8
REVELSTOKE   KEL      21   20     650   7     90   26    2000   9

*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    VR   5   W   13   W   20
CRANBROOK             W   11   W   19

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         300  m         20 C
SPOKANE         300  m         20 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.     59   17    1300  17    100   22    2950  16
PR. GEORGE   P.G.      9   17     700   7    100   22    2200  13
SMITHERS     P.G.     13   17     650   3    100   24    2350  12
WELLS GRAY   P.G.     89   18    1850  16    100   22    4000  16
FT NLSN      F.N.      9   20     400  28     99   25    1100  24
FT STJOHN    F.N.      9   19     700  24    100   26    2650  15

*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            W   24   W   33
SMITHERS              W   22   SW  33

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      450  m         17 C
FT. NELSON      500  m         18 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     30   17     550   5     50   22    1050   5
FRASER VLY   QUIL     37   19     700   5     62   25    1450   5
SRN VRISL    QUIL     35   16     450   5     45   22    1000   5
CNTRL VRISL  QUIL     20   17     500   5     40   21     850   5
NRN VRISL    HRDY     25   14     400   5     40   17     500   5
TERRACE      ANT      54   15    1150   6    100   20    2000  11
STEWART      ANT      58   16    1100   6     78   20    1450   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   11   W   11   W   19
PORT HARDY   NW  15   W   15   W   26
SANDSPIT     W   22   SW  24   SW  33

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1500 m         19 C
PORT HARDY       800 m         16 C
ANNETTE         1200 m         15 C

TODAY'S VENTING: FAIR.

VENTING FOR TUESDAY: FAIR.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR BECOMING GOOD FRIDAY.

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


END/MWSO