FPCN39 CWLW 131332
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 13 JUNE 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       9   19     200   0    100   28    3200   8
KAMLOOPS     KEL       9   18     350   0    100   27    3350   8
OKANAGAN     KEL       9   19     550   0    100   26    3350   8
CASTLEGAR    SPOK     23   16     800   5    100   26    3500  12
CRANBROOK    SPOK      9   12     950  15    100   22    3950  14
REVELSTOKE   KEL       9   16     450   0    100   26    3450   8

*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    NW  11   NW  26   NW  37
CRANBROOK             NW   9   NW  24

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1400 m         21 C
SPOKANE         1500 m         22 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.     94   12    1800  17    100   22    3950  14
PR. GEORGE   P.G.      9   11     700  23    100   21    3700  16
SMITHERS     P.G.      9   11     500   7    100   20    3500  15
WELLS GRAY   P.G.    100   14    4000  14    100   23    4000  14
FT NLSN      F.N.     99   11    1350  18    100   19    3400  25
FT STJOHN    F.N.    100   10    1900  21    100   19    3700  26

*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   24   NW  20
SMITHERS              W   19   W   20

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         18 C
FT. NELSON      1500 m         13 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     90   15    1050  14    100   20    1250  16
FRASER VLY   QUIL     93   16    1100  14    100   23    1350  16
SRN VRISL    QUIL     68   14     800  11    100   21    1250  14
CNTRL VRISL  QUIL     88   16    1050  13    100   25    1500  14
NRN VRISL    HRDY     10   11       0  37    100   16    1200  34
TERRACE      ANT      51   11     750  10     92   19    2200   7
STEWART      ANT      54   13     750   8     89   19    2000   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   24   NW  24   NW  33
PORT HARDY   NW  33   NW  46   NW  48
SANDSPIT     W   24   W   37   W   41

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2600 m         31 C
PORT HARDY      2000 m         26 C
ANNETTE          900 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