FPCN39 CWLW 251432
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT WEDNESDAY 25 JUNE 1997 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      21   18     700   3     60   24    3200   8
KAMLOOPS     KEL      28   18     850   4     60   24    3350   8
OKANAGAN     KEL      19   17     750   3     60   24    3350   8
CASTLEGAR    SPOK     27   16     950   4     87   23    3500   4
CRANBROOK    SPOK     16   14    1100   4     89   21    3950   5
REVELSTOKE   KEL      14   15     650   3    100   23    3450   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
PENTICTON    S    9   S   22   S   43
CRANBROOK             SW   9   SW  26

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1500 M         22 C
SPOKANE         1100 M         19 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.      9   15     950   9    100   22    3950  11
PR. GEORGE   P.G.     24   16     850   9    100   21    2750  10
SMITHERS     P.G.     11   15     750   1     83   20    1100   7
WELLS GRAY   P.G.     20   10    1200   5    100   23    4000  11
FT NLSN      F.N.     50   16    1300   6    100   23    2700   8
FT STJOHN    F.N.     81   16    2150   8    100   22    3700   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PR. GEORGE            SE  19   S   28
SMITHERS              E   15   E   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 M         20 C
FT. NELSON      1400 M         16 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     50   16     600  10    100   20    1550  16
FRASER VLY   QUIL     49   16     550  10    100   21    1600  16
SRN VRISL    QUIL     21   14     250   5     93   19    1200  13
CNTRL VRISL  QUIL     20   14     250   5     60   17     700  10
NRN VRISL    HRDY     30   14     500   5     63   16     850   9
TERRACE      ANT      64   17    1350   6    100   23    3200   9
STEWART      ANT      15   14     500   5     96   23    2300   7

*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    SW  22   SW  33   SW  39
PORT HARDY   S   31   S   39   S   35
SANDSPIT     NE  17   E   20   E   33

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2000 M         22 C
PORT HARDY      1100 M         16 C
ANNETTE          800 M         16 C

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD


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

END/JMS