FPCN39 CWLW 091433
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 9 August 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     100   23    2050  10     88   28    1900  11
KAMLOOPS     KEL      95   20    1900  10     88   25    1900  11
OKANAGAN     KEL      43   18    1000   6     88   27    1900  11
CASTLEGAR    KEL      52   17    1200   7     88   24    1900  11
CRANBROOK    KEL      29   16    2150   4     75   22    1900  13
REVELSTOKE   KEL      62   18    1450   7     88   23    1900  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
PENTICTON    VR   5   NE  11   VR   5
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         609  m         17 C
SPOKANE         MSG  m        MSG C

TODAY'S VENTING: GOOD
VENTING FOR SUNDAY: FAIR TO GOOD
VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR


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   12     950   3    100   22    3250   9
PR. GEORGE   P.G.     33   13     900  12    100   21    3200  10
SMITHERS     P.G.     40   15     950   9    100   22    3200   9
WELLS GRAY   P.G.     31   14    1600   4    100   22    3200   9
FT NLSN      F.N.      9   17     400  10    100   25    3200  12
FT STJOHN    F.N.      9   14     700  10    100   21    3250  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            W   15   N   15
SMITHERS              NW  15   N   15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         17 C
FT. NELSON       700 m         20 C

TODAY'S VENTING: GOOD
VENTING FOR SUNDAY: FAIR TO GOOD
VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   15     200   3    100   26    2600   9
FRASER VLY   QUIL     11   21     200  10    100   30    2600   7
SRN VRISL    QUIL     15   19     100   6    100   25    2600   6
CNTRL VRISL  QUIL     38   23     550   6     98   31    2800   6
NRN VRISL    HRDY     15   16     200   3     75   22    1550   9
TERRACE      ANT      57   20     650  14    100   27    1900  12
STEWART      ANT      17   18     150   6     97   27    1900  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    NE  22   NE  24   E   17
PORT HARDY   N   19   NE  20   NE  26
SANDSPIT     N   30   N   26   N   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       900 m         25 C
PORT HARDY       800 m         26 C
ANNETTE          900 m         23 C

TODAY'S VENTING: GOOD
VENTING FOR SUNDAY: FAIR TO GOOD
VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO GOOD


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

END/MWSO/TAL