FPCN39 CWLW 311400
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 31 MAY 1999 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      65   17     500   7    100   19     750  13

KAMLOOPS     KEL      60   16     550   8    100   21    2200  14

OKANAGAN     KEL      60   17     600   7    100   22    2200  14

CASTLEGAR    SPOK     40   14     800   5    100   18    2100  11

CRANBROOK    SPOK     38   12     950   5    100   16    2400  15

REVELSTOKE   KEL       9   12     450   3    100   16    2500  13


*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    W   13   W   26   W   44
CRANBROOK             W   17   W   46

TODAY'S VENTING: GOOD BY AFTERNOON DUE TO MODERATE INSTABILITY AND
BRISK MIXING LAYER WINDS AS COLD FRONT SWEEPS ACROSS AREA.




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.    100   12    2350  25    100   16    2950  28

PR. GEORGE   P.G.     98   11    1700  17    100   14    2300  19

SMITHERS     P.G.      9    9     500   1     91   13    1800  11

WELLS GRAY   P.G.     ##   ##     ###  ##    100   16    4000  29

FT NLSN      F.N.      9    2     400   2     60    0    2800   8

FT STJOHN    F.N.      9   11     700   7    100   14    2600  20


*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            W   37   W   44
SMITHERS              W   33   W   44

TODAY'S VENTING: GOOD THIS AFTERNOON AS AIRMASS DESTABILIZED THROUGH
DAY. BRISK MIXING LAYER WINDS.




VENTING FOR TUESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     36   14     550   7     57   17     700   9

FRASER VLY   QUIL     38   15     550   7     61   18     800   9

SRN VRISL    QUIL     35   15     550   5     55   18     750   8

CNTRL VRISL  QUIL     34   15     550   5     58   19     850   8

NRN VRISL    HRDY     16   11     200   4     55   12    1000  15

TERRACE      ANT      77   10    1500   8    100   12    2050  10

STEWART      ANT      63   10     700  11     84   12    1500   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
VANCOUVER    W   26   W   37   W   46
PORT HARDY   NW  22   W   35   W   54
SANDSPIT     W   39   NW  50   W   54

TODAY'S VENTING: GOOD THIS AFTERNOON WITH BRISK WINDS IN MIXING
LAYER AND MODERATE INSTABILITY.




VENTING FOR TUESDAY: GOOD




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


END/TCS
$$$$^^