FPCN39 CWLW 031331
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 FRIDAY 3 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      15    7     500   2     69   15    1950   5
KAMLOOPS     KEL      19    9     750   3     50   12    1650   4
OKANAGAN     KEL      19    9     750   3     50   12    1650   4
CASTLEGAR    SPOK     22    9     950   3     47   14    2000   3
CRANBROOK    SPOK     83    9    1950  12     77   14    3950   5
REVELSTOKE   KEL      17    8     750   3     61   12    1850   5

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   S   17
CRANBROOK             VR   5   SE  17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m          9 C
SPOKANE          900 m          8 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: FAIR TO GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR.


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.     11    4    1100   7    100   10    3950   8
PR. GEORGE   P.G.     16    4     800   7     93    8    2750   7
SMITHERS     P.G.     14    3     600   6     90    9    2600   7
WELLS GRAY   P.G.     37    4    1550   7    100   10    4000   8
FT NLSN      F.N.      9    4     400   3    100   10    3400   8
FT STJOHN    F.N.     23    4     850  10    100    8    3700   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            N   11   VR   5
SMITHERS              NE   9   VR   5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       700 m          6 C
FT. NELSON      1000 m          9 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: FAIR TO GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15    6     500   8    100   12    2100   9
FRASER VLY   QUIL     15    5     450   8    100   14    2550   8
SRN VRISL    QUIL     16    6     350   7     92   12    1900   8
CNTRL VRISL  QUIL     13    9     550   7     97   13    2250   7
NRN VRISL    HRDY     17    6     100  13     70   10    1100   9
TERRACE      ANT       9    4     250   5    100   10    2850   8
STEWART      ANT       9    6     450   4     87   10    2200   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   S   13
PORT HARDY   N   11   VR   5   E   11
SANDSPIT     N   20   N   19   NE  22

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       500 m          8 C
PORT HARDY       200 m          7 C
ANNETTE          200 m          6 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: FAIR

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR




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


END/MWSO