FPCN39 CWLW 111343
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 THURSDAY 11 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     550   0    100   27    2100   9
KAMLOOPS     KEL      21   19     600   5    100   28    3350   8
OKANAGAN     KEL      21   19     600   5    100   27    2400   9
CASTLEGAR    SPOK     44   19    1050   8    100   26    3500   7
CRANBROOK    SPOK     53   17    1500  10    100   23    3950   7
REVELSTOKE   KEL      34   20     900   6    100   28    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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW   9   NW  19   NW  24
CRANBROOK             VR   5   W   15

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          900 m         19 C
SPOKANE          300 m         16 C

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: 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   15    2500  19    100   23    3950  19
PR. GEORGE   P.G.     42   14     900  17    100   25    3700  19
SMITHERS     P.G.      9   12     500   6    100   24    3500  18
WELLS GRAY   P.G.    100   15    2600  19    100   26    4000  19
FT NLSN      F.N.     85   14     750  25    100   26    3400  26
FT STJOHN    F.N.     42   12     675  20    100   22    3700  25

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   33   W   43
SMITHERS              W   28   NW  43

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       150 m         14 C
FT. NELSON      1300 m         15 C

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     23   15     650   3     53   20    1400   4
FRASER VLY   QUIL     26   16     750   3     56   21    1500   4
SRN VRISL    QUIL     24   15     550   3     51   20    1300   4
CNTRL VRISL  QUIL     21   14     450   3     55   21    1450   4
NRN VRISL    HRDY     61   11     500  14    100   16    1100  17
TERRACE      ANT      93   10     950  20    100   19    3200  18
STEWART      ANT     100   13    1550  17    100   19    2300  17

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  19   NW  19   NW  22
PORT HARDY   NW  39   N   39   NW  33
SANDSPIT     NW  24   W   31   W   41

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       900 m         17 C
PORT HARDY      1200 m         17 C
ANNETTE         1500 m         15 C

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD.

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


END/MWSO