FPCN39 CWLW 221346
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT SATURDAY 22 AUGUST 1998 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      36   23     950   4     72   28    1950   5
KAMLOOPS     KEL      23   20     800   3     80   28    2250   6
OKANAGAN     KEL      11   17     600   1     71   27    2050   5
CASTLEGAR    SPOK     31   20     800   8    100   27    3500  14
CRANBROOK    SPOK     10   17     950  17    100   24    3950  15
REVELSTOKE   KEL      13   17     650   2     46   23    1500   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   SW  11
CRANBROOK             W    9   W   17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          900 m         21 C
SPOKANE          600 m         20 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.     10   15     950  14    100   26    3950  15
PR. GEORGE   P.G.      9   14     700   3    100   24    3700  13
SMITHERS     P.G.      9   13     550   3     91   22    1950  10
WELLS GRAY   P.G.     10   15    1000  14    100   26    4000  15
FT NLSN      F.N.     40   14     500  34    100   21    2150  22
FT STJOHN    F.N.     97   16    1250  29    100   22    3700  20

*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   19   W   28
SMITHERS              NW  15   W   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1700 m         20 C
FT. NELSON      1200 m         19 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     72   20    1200   8     85   23    1850   7
FRASER VLY   QUIL     73   20    1200   8     90   24    2050   7
SRN VRISL    QUIL      9   17     900   0     66   23    1550   5
CNTRL VRISL  QUIL      9   19    1150   0     78   24    2050   5
NRN VRISL    HRDY     55   14     700   9     73   18    1100   8
TERRACE      ANT      66   16    1300   7     94   21    2200   8
STEWART      ANT      49   16     750   7     88   21    1950   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    W    9   VR   5   S    9
PORT HARDY   NW  20   VR   5   W    9
SANDSPIT     W   20   NW  17   NW  17

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1500 m         22 C
PORT HARDY      1800 m         25 C
ANNETTE          500 m         14 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/MWSO