FPCN39 CWLW 211430
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Saturday 21 June 1997 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      17   15     600   2     81   20    1550   8
KAMLOOPS     KEL      74   18    1500   8    100   21    2900   8
OKANAGAN     KEL      26   14     650   6    100   21    2850   8
CASTLEGAR    SPOK     34   14     950   6     92   20    2250   8
CRANBROOK    SPOK      9   12     950  13    100   18    3950   8
REVELSTOKE   KEL      11   12     550   2     88   19    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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S    9   S   13
CRANBROOK             VR   5   SW  17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1700 m         18 C
SPOKANE         1100 m         17 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.     68   12    2000   8    100   17    3950   8
PR. GEORGE   P.G.     45   11    1100  11     84   15    2050   9
SMITHERS     P.G.     45   12    1000   9     84   16    2000   8
WELLS GRAY   P.G.     73   13    2200   8    100   18    4000   8
FT NLSN      F.N.     50   17     800  12    100   22    3400  12
FT STJOHN    F.N.      9   13     700  12    100   18    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  17   NE  17
SMITHERS              E   15   E   17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 m         13 C
FT. NELSON      1200 m         22 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     60   14     950   8     85   17    1800   7
FRASER VLY   QUIL     70   15    1250   7     89   18    1950   7
SRN VRISL    QUIL     33   14     750   4     74   17    1650   6
CNTRL VRISL  QUIL      9   13     350   0     56   15    1150   5
NRN VRISL    HRDY      9   11       0   4     60   14     700  10
TERRACE      ANT      10   13     250  11     89   17    1800   9
STEWART      ANT      12   13     100   3     59   17     900   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    SW  15   SW  11   S    9
PORT HARDY   NW  13   VR   5   E   13
SANDSPIT     NW  26   NW  13   VR   5

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       300 m         13 C
PORT HARDY      1100 m         16 C
ANNETTE          200 m         15 C

TODAY'S VENTING: good.

VENTING FOR SUNDAY: good.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: good.


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

END/dsl