FPCN39 CWLW 061325
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 6 APRIL 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    8     200   0     61   14    1850   4

KAMLOOPS     KEL      21    9     750   3     77   15    2650   4

OKANAGAN     KEL      21    9     750   3     68   14    2350   4

CASTLEGAR    SPOK     32    9    1200   4     60   13    2300   4

CRANBROOK    SPOK     32    9    1200   4     55   10    2650   3

REVELSTOKE   KEL      31    9    1050   4     60   12    2000   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
PENTICTON    VR   5   S   13   S   22
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m          7 C
SPOKANE          870 m          6 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: Good Wednesday then fair as a
ridge builds.

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.     90    7    1950  14    100   12    3950  18

PR. GEORGE   P.G.     62    7    1250  12    100   12    2650  15

SMITHERS     P.G.     24    5     700  10     87   10    1700  11

WELLS GRAY   P.G.    100    8    2400  15    100   13    4000  18

FT NLSN      F.N.      9    5     400  12     73   13    1400   9

FT STJOHN    F.N.      9    5     700   6     80   12    2550   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   S   35
SMITHERS              S   20   S   35

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       730 m          6 C
FT. NELSON      1010 m         12 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: Good Wednesday then fair.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   10    1550  13    100   14    2600  15

FRASER VLY   QUIL    100    9    1400  13    100   13    2100  14

SRN VRISL    QUIL     40    8     450   9    100   14    2300  13

CNTRL VRISL  QUIL     21    7     250   6    100   12    1750  12

NRN VRISL    HRDY     26    8     450   4    100   12    1950  13

TERRACE      ANT     100    5     800  35    100   10    1850  35

STEWART      ANT     100    7     750  30    100   10    1300  33


*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    SE  24   S   30   S   37
PORT HARDY   S   20   S   30   S   41
SANDSPIT     SW  19   SW  22   S   26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       290 m          7 C
PORT HARDY       230 m          8 C
ANNETTE          none

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: Good.

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


END/PJS