FPCN39 CWLW 121323
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 FRIDAY 12 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      16   18     500   2     91   26    2000   8

KAMLOOPS     KEL       9   13     350   2    100   26    2600   9

OKANAGAN     KEL      12   17     500   2     98   25    2250   9

CASTLEGAR    SPOK     19   18     750   4     82   25    2250   7

CRANBROOK    SPOK      9   15     950   7    100   21    3950   8

REVELSTOKE   KEL      11   17     550   2    100   26    3450  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW   9   NW  20   N   30
CRANBROOK             VR   5   W   11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         21 C
SPOKANE         1400 m         23 C

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: 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.    100   11    3950  17    100   22    3950  17

PR. GEORGE   P.G.     45   10    1000  14    100   20    3700  16

SMITHERS     P.G.      9   10     500   1    100   20    3500  14

WELLS GRAY   P.G.    100   11    4000  17    100   23    4000  17

FT NLSN      F.N.    100   13    1850  22    100   19    3400  26

FT STJOHN    F.N.    100   10    1900  23    100   19    3700  27


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   24   NW  28
SMITHERS              W   22   NW  28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         15 C
FT. NELSON       800 m         10 C

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     33   16     550   6     45   21     850   6

FRASER VLY   QUIL     34   16     550   6     68   25    1650   5

SRN VRISL    QUIL     34   15     550   5     47   22     850   5

CNTRL VRISL  QUIL     35   16     550   5     69   26    1700   5

NRN VRISL    HRDY      9   10       0  12     78   16     750  14

TERRACE      ANT      41   12    1100   4    100   21    3200  12

STEWART      ANT      40   13     900   4    100   21    2300   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  20   NW  17   N   24
PORT HARDY   NW  41   N   39   NW  41
SANDSPIT     W   17   W   30   W   39

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1600 m         27 C
PORT HARDY      1300 m         18 C
ANNETTE         1000 m         15 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR TO GOOD

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


END/MWSO