FPCN39 CWLW 041410
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 4 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      11   17     650   1     73   28    3200   3
KAMLOOPS     KEL       9   14     550   0     73   25    3350   3
OKANAGAN     KEL       9   13     500   0     73   24    3350   3
CASTLEGAR    SPOK     45   14    1000   8    100   23    3500   8
CRANBROOK    SPOK     45   10     600   8     80   21    3500   8
REVELSTOKE   KEL       9   13     550   0     73   22    3450   3

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

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

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          500 m         19 C
SPOKANE         MSG  m        MSG C

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: 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   10     950  10    100   20    3950  15
PR. GEORGE   P.G.     45   13    1150   9    100   21    3700  14
SMITHERS     P.G.     34   13     950   6    100   22    3500  12
WELLS GRAY   P.G.     70   14    1800  11    100   23    4000  15
FT NLSN      F.N.     34   10     700   3    100   21    4000  15
FT STJOHN    F.N.     33    8     600   2    100   20    4000  15

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  19   NE  22
SMITHERS              VR   5   NW  22

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         16 C
FT. NELSON       700 m         18 C

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     26   15     600   3     43   20    1100   4
FRASER VLY   QUIL     33   17     800   4     99   25    2700   7
SRN VRISL    QUIL     17   14     500   2     38   20    1050   3
CNTRL VRISL  QUIL     18   15     600   2     82   25    2400   5
NRN VRISL    HRDY     20   14     350   4     23   19     450   4
TERRACE      ANT      10   15     250  16     91   25    1950   8
STEWART      ANT      12   17      50   6     84   25    1500   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   N   11   N   13
PORT HARDY   NW  11   N    9   N   11
SANDSPIT     N   35   N   28   NW  24

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1400 m         25 C
PORT HARDY      1500 m         22 C
ANNETTE          500 m         15 C

TODAY'S VENTING: POOR NEAR THE COAST. GOOD INLAND.

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR.

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


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