FPCN39 CWLW 191324
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 19 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      17   17     800   1     96   23    2300   7
KAMLOOPS     KEL      13   15     750   1     94   22    2400   7
OKANAGAN     KEL      31   17    1250   3     94   22    2400   7
CASTLEGAR    SPOK     37   15    1200   5    100   19    3500   6
CRANBROOK    SPOK     10   11     950  10    100   17    3950  10
REVELSTOKE   KEL       9   13     500   1     67   17    1500   6

*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    VR   5   N   17   N   22
CRANBROOK             NE   9   NE  28

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         NONE.
SPOKANE         1500 m         16 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR TO 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.      9   13     950  18    100   18    2100  15
PR. GEORGE   P.G.      9   13     700  10     83   18    1550  14
SMITHERS     P.G.      9   14     650   0     88   21    1700  11
WELLS GRAY   P.G.     54   14    1300  18    100   19    2650  14
FT NLSN      F.N.      9   16     400   8     67   22    1750   6
FT STJOHN    F.N.      9   14     700   8    100   20    3700   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
PR. GEORGE            N   19   N   17
SMITHERS              W   11   W   17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1700 m         21 C
FT. NELSON       700 m         18 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     58   15     850   8    100   20    1750  10
FRASER VLY   QUIL     58   15     800   8    100   21    1850  11
SRN VRISL    QUIL     42   14     700   6     95   20    1650  10
CNTRL VRISL  QUIL     45   15     800   6    100   23    2050  10
NRN VRISL    HRDY     82   13     600  21    100   17    1150  20
TERRACE      ANT      19   17     650   3     90   26    3200   5
STEWART      ANT      20   17     550   2     62   26    1750   4

*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    W   11   N   17   NE  19
PORT HARDY   N   41   N   28   N   28
SANDSPIT     NW  33   NW  22   NW  20

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       800 m         16 C
PORT HARDY       NONE.
ANNETTE          600 m         20 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: FAIR TO GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR.


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


END/