FPCN39 CWLW 021351
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 TUESDAY 2 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      27   19     800   3    100   26    3200   9
KAMLOOPS     KEL      72   20    1800   6    100   26    3350   9
OKANAGAN     KEL      16   16     650   3    100   25    3350   9
CASTLEGAR    SPOK     51   18    1500   5     93   24    3500   5
CRANBROOK    SPOK     28   13    1450   4     93   19    3950   5
REVELSTOKE   KEL      14   15     650   3    100   24    3450   9

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N   15   N   17
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          300 m         16 C
SPOKANE          400 m         15 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: 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.     80   13    1850  12    100   21    3950  12
PR. GEORGE   P.G.     38   12    1200   7    100   20    3700  11
SMITHERS     P.G.     69   16    1600   8    100   24    3500  13
WELLS GRAY   P.G.     87   13    2050  12    100   22    4000  12
FT NLSN      F.N.     70   13    1850  12    100   21    3450  11
FT STJOHN    F.N.     60   12    1200   7    100   20    3200  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  19   NW  28
SMITHERS              NW  17   NW  28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      550 m          13 C
FT. NELSON      500 m          14 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     42   17     700   6    100   21    1300  14
FRASER VLY   QUIL     42   17     700   6    100   25    1850  18
SRN VRISL    QUIL     24   16     600   3     98   22    1350  12
CNTRL VRISL  QUIL     58   19     850   8    100   26    2050  16
NRN VRISL    HRDY     14   12     250   2     22   18     550   3
TERRACE      ANT       9   18     200  12     90   26    2300   7
STEWART      ANT      16   16     100   8     92   26    1950   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    N   15   N   17   NE  22
PORT HARDY   N   20   NE  15   N   24
SANDSPIT     N   35   N   37   N   37

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       350 m         17 C
PORT HARDY       800 m         19 C
ANNETTE          700 m         17 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD.

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


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