FPCN39 CWLW 011434
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 Tuesday 1 July 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      31   19     750   4    100   24    2250  15
KAMLOOPS     KEL      34   19    1000   4    100   24    3550   8
OKANAGAN     KEL      34   19    1000   4    100   24    3550   5
CASTLEGAR    SPOK     38   17    1200   5    100   23    3500   9
CRANBROOK    SPOK     43   15    1700   5    100   20    3950  11
REVELSTOKE   KEL      24   17     850   4    100   21    3550   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   15   W   19
CRANBROOK             VR   5   W   15

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 m         19 C
SPOKANE         1450 m         19 C

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON DUE TO AN UNSTABLE
AIRMASS.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD THURSDAY AFTERNOON
BECOMING ONLY FAIR FRIDAY AND SATURDAY DUE TO A RIDGE OF HIGH
PRESSURE.




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.    100   16    3950   9    100   22    3950   9
PR. GEORGE   P.G.     55   16    1300   9    100   23    3700  10
SMITHERS     P.G.     45   16    1050   8    100   21    3500   9
WELLS GRAY   P.G.     46   15    1650   7    100   22    4000   9
FT NLSN      F.N.     36   14     800   8    100   18    3400   7
FT STJOHN    F.N.    100   15    3700   7    100   20    3700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   W   19
SMITHERS              W   15   SW  19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         19 C
FT. NELSON       800 m         15 C

TODAY'S VENTING: BECOMING GOOD BY AFTERNOON DUE TO AN UNSTABLE
AIRMASS.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD THURSDAY. FAIR TO
GOOD FRIDAY AND SATURDAY AS THE AIRMASS BECOMES STABLE.



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     70   16    1000  10     70   20    1000  10
FRASER VLY   QUIL     70   17    1000  10     70   20    1000  10
SRN VRISL    QUIL     70   17    1000  10     70   20    1000  10
CNTRL VRISL  QUIL     70   17    1000  10     70   20    1000  10
NRN VRISL    HRDY     39   15     650   5     70   17    1100   9
TERRACE      ANT      96   18    1500  12    100   22    3200  11
STEWART      ANT      87   17    1200  11    100   22    1800  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   17   W   17   W   15
PORT HARDY   SW  15   S   19   SW  15
SANDSPIT     SW  20   SW  17   SW  17

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       100 m         14 C
PORT HARDY       120 m         15 C
ANNETTE         NONE

TODAY'S VENTING: GOOD AS THE AIRMASS REMAINS UNSTABLE ENOUGH
MAINLY AT LOW LEVELS.

VENTING FOR WEDNESDAY: FAIR.

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR THROUGH FRIDAY DUE
TO A RIDGE OF HIGH PRESSURE. BECOMING GOOD ON SATURDAY.




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

END/JDG