FPCN39 CWLW 251323
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 MONDAY 25 MAY 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   13     200   2     47   17     600   2
KAMLOOPS     KEL      33   16     700   7     43   18     900   7
OKANAGAN     KEL      13   15     550   2     43   18     900   7
CASTLEGAR    SPOK     20   14     750   4     78   18    1400  12
CRANBROOK    SPOK      7    8    1050   4    100   19    2750  23
REVELSTOKE   KEL       9   13     450   2     66   19    1350   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   11   S   24
CRANBROOK             SE  13   SE  31

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1005 m         18 C
SPOKANE          833 m         14 C

TODAY'S VENTING: FAIR

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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   14     950   8    100   19    3950  13
PR. GEORGE   P.G.     14   15     850   3    100   20    3700  11
SMITHERS     P.G.      9   13     500   2     22   18     900   3
WELLS GRAY   P.G.      9   13    1000   8    100   18    4000  13
FT NLSN      F.N.     45   16     900   8     61   20    1200   8
FT STJOHN    F.N.     45   17    1250   8    100   22    2750  11

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   31   E   44
SMITHERS              NE  22   E   44

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       950 m         18 C
FT. NELSON      1220 m         20 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     87   12    1150  12    100   15    2100  12
FRASER VLY   QUIL     83   12    1050  12    100   15    2050  12
SRN VRISL    QUIL     72   12     900  11    100   16    2200  11
CNTRL VRISL  QUIL     51   11     600   9    100   14    1650  11
NRN VRISL    HRDY     40   11     650   6     58   13    1400   5
TERRACE      ANT      35   12    1150   3     48   15    1450   4
STEWART      ANT      25   12     600   3     48   15    1300   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   13   W   15   SW   9
PORT HARDY   NW  13   VR   5   SE  17
SANDSPIT     NW  22   NE  11   E   22

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NONE
PORT HARDY        90 m         10 C
ANNETTE          760 m         11 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR

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


END/MWSO