FPCN39 CWLW 221407
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 PST SUNDAY 22 MARCH 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      16   11     500   2     48   15    1400   4
KAMLOOPS     KEL      26   12    1000   3     80   15    1850  10
OKANAGAN     KEL      16   11     700   2     64   14    1550   6
CASTLEGAR    SPOK      9    7     500   4     37   10    1000   5
CRANBROOK    SPOK      9    6     950   5     35    9    1150   8
REVELSTOKE   KEL       9    6     450   2     31    9     850   2

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PENTICTON    VR   5   SW  19   SW  37
CRANBROOK             VR   5   S   26

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 M         10 C
SPOKANE          900 M         11 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     43    7    1600   6     82   10    2450   8
PR. GEORGE   P.G.     58    5    1200  12     64    8    1350  12
SMITHERS     P.G.      9    3     500   5     62    8    1250   8
WELLS GRAY   P.G.     43    6    1500   8     84   10    2700  10
FT NLSN      F.N.      9    1     400   2     75    8    1500   6
FT STJOHN    F.N.      9    0     700   7     53    4    1250   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PR. GEORGE            SE  30   S   31
SMITHERS              E   20   VR  31

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 M          8 C
FT. NELSON       700 M          7 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR TO GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     10   11     100   8     60   13     800  10
FRASER VLY   QUIL     10   12      50   5     66   14     900  10
SRN VRISL    QUIL      9   11       0   8     58   13     800  11
CNTRL VRISL  QUIL      9   10      50   8     48   12      50   8
NRN VRISL    HRDY     20   10     200   6     80   12    1200  13
TERRACE      ANT      10    9     250  15     44   12     750  10
STEWART      ANT      10   10      50   3     40   12     600   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    SW  22   SW  31   SW  39
PORT HARDY   S   20   S   24   S   26
SANDSPIT     S   20   S   22   S   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE        NIL          NIL
PORT HARDY       400 M         10 C
ANNETTE          300 M         13 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR TO GOOD

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


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