FPCN39 CWLW 181432
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 Monday 18 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      14   23     850   1    100   31    3200   6
KAMLOOPS     KEL      16   22     900   1     98   28    2950   6
OKANAGAN     KEL      12   20     750   1    100   29    3350   6
CASTLEGAR    SPOK     23   18     800   5     87   28    3150   5
CRANBROOK    SPOK      9   17     950   4    100   25    3950   8
REVELSTOKE   KEL       9   17     500   0     80   24    3250   6

*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   11   W   19
CRANBROOK             W    9   W   26

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1400 m         25 C
SPOKANE         1300 m         25 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.      9   17     950  11    100   24    3950   7
PR. GEORGE   P.G.     14   16     750   7     79   23    2200   7
SMITHERS     P.G.      9   16     700   0     82   22    2200   6
WELLS GRAY   P.G.     16   17    1050  11    100   24    4000   7
FT NLSN      F.N.      9   13     400  10     82   17    2250  10
FT STJOHN    F.N.      9   13     700  10    100   17    3700  10

*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   20   W   26
SMITHERS              W   15   W   26

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         21 C
FT. NELSON       600 m         16 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     33   20     900   8     57   24    2000   6
FRASER VLY   QUIL     33   20     900   8     67   26    2000   6
SRN VRISL    QUIL     43   20    1000   4     67   27    2000   4
CNTRL VRISL  QUIL     44   21    1050   4     67   27    2050   4
NRN VRISL    HRDY     56   17     600  10     63   20    2250  10
TERRACE      ANT      64   19    1050   9    100   26    2800  11
STEWART      ANT      52   20     750   7    100   26    2450  10

*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    SW   9   W   13   W   15
PORT HARDY   NW  13   W   15   W   19
SANDSPIT     W   17   W   22   W   24

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2700 m         30 C
PORT HARDY      1900 m         24 C
ANNETTE          300 m         17 C

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR TUESDAY: FAIR TO GOOD


VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR.



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

END/JMS