FPCN39 CWLW 301455
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 MONDAY 30 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      70    9     750  15    100   12    1550  20
KAMLOOPS     KEL      39    8     800   8     94   12    1900  10
OKANAGAN     KEL      16    5     600   3     79   10    1450  10
CASTLEGAR    SPOK     33    4     800   9     57   10    1100  10
CRANBROOK    SPOK      9    2     950  13     89    8    2500   9
REVELSTOKE   KEL      11    3     500   3     33    7     800   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   SW  19   SW  35
CRANBROOK             W   11   W   33

TODAY'S VENTING: GOOD LOCALLY POOR

VENTING FOR TUESDAY: 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    5     950  13    100   10    2550  15
PR. GEORGE   P.G.     10    6     700  13     57    8    1150  13
SMITHERS     P.G.      9    4     500   7     21    7     700   8
WELLS GRAY   P.G.      9    4    1050  13     84    7    1800  15
FT NLSN      F.N.     14    6     450   6     25   10     750   5
FT STJOHN    F.N.     10    6     700  11     10    9     700  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            SW  26   SW  28
SMITHERS              SW  24   W   28

TODAY'S VENTING: GOOD LOCALLY POOR IN THE CENTRAL INTERIOR.  POOR
NORTHEAST.

VENTING FOR TUESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    9    1250  16    100   11    1500  16
FRASER VLY   QUIL    100    9    1250  16    100   13    1700  16
SRN VRISL    QUIL     35    8     350   9    100   12    1550  14
CNTRL VRISL  QUIL     98    9    1250  14    100   11    1400  14
NRN VRISL    HRDY     24    7     200   8     97    9     950  17
TERRACE      ANT      85    4    1050  15    100    6    1750  16
STEWART      ANT      12    5     350   1     82    6    1000  12

*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    S   30   SW  41   SW  46
PORT HARDY   W   19   W   20   SW  26
SANDSPIT     SW  28   W   28   W   26

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

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


END/MWSO