FPCN39 CWLW 251329
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 25 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      18   14     500   3     48   20    1400   4
KAMLOOPS     KEL      15   14     550   3    100   22    2850   7
OKANAGAN     KEL      15   14     550   3     81   20    2400   6
CASTLEGAR    SPOK     57   15    1000  12    100   20    2000  14
CRANBROOK    SPOK     30   12    1050  18    100   18    2900  14
REVELSTOKE   KEL      12   13     550   3     39   17    1350   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   SW  11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         600 m         14 C
SPOKANE        1300 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.     21   11    1350   3     69   16    2650   5
PR. GEORGE   P.G.     30   13    1250   4     64   17    2300   5
SMITHERS     P.G.      9   12     500   2     59   17    1850   5
WELLS GRAY   P.G.     47   13    2050   4     97   17    4000   5
FT NLSN      F.N.     10   13     400  21     95   16    1200  19
FT STJOHN    F.N.     10   14     700  18    100   18    2200  18

*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            VR   5   VR   5
SMITHERS              NW  17   N    5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      NONE          NONE
FT. NELSON      NONE          NONE

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     75   13    1000  11    100   16    1700  11
FRASER VLY   QUIL     63   12     700  11     91   15    1400  11
SRN VRISL    QUIL     25   12     600   3    100   17    1800  10
CNTRL VRISL  QUIL     63   13     900   8    100   17    1850  10
NRN VRISL    HRDY     14   11     200   3     34   14    1100   3
TERRACE      ANT       9   14     250   3     90   20    2200   7
STEWART      ANT      15   14     150   4     83   20    1900   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  13   VR   5   VR   5
PORT HARDY   NW  22   NW  22   N   22
SANDSPIT     NW  30   NW  24   NW  20

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NONE          NONE
PORT HARDY      NONE          NONE
ANNETTE         220 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.


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