FPCN39 CWLW 011430
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 OCTOBER 1996 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 OTHERFORECAST UPPER WINDS FOR TUESDAY AFTERNOON 
(WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   W   11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          470 m         11 C
SPOKANE          750 m         11 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD

SDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S    9   W   24
SMITHERS              SE  17   SW  24

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1280 m          6 C
FT. NELSON       570 m          4 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     20   11     350   4     38   16     950   4

FRASER VLY   QUIL     21   11     350   4     42   18    1050   4

SRN VRISL    QUIL     17   10     250   4     41   17     950   4

CNTRL VRISL  QUIL     13    7     150   4     28   14     600   4

NRN VRISL    HRDY     13    8     100   6     60   13    1000   7

TERRACE      ANN       9    4     200   4     66   10    1650   6

STEWART      ANN      10    4      50   3     43   10    1000   4


*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    E   17   SE  11   VR   5
PORT HARDY   S   24   S   31   S   31
SANDSPIT     SE  26   S   30   S   39

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1340 m         23 C
PORT HARDY      1500 m         18 C
ANNETTE          400 m         10 C

TODAY'S VENTING: GOOD IN THE NORTH. FAIR IN THE SOUTH UNDER WEAK
 RIDGE, BUT DEEP SURFACE INVERSION.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD

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

END/PJS