FPCN39 CWLW 291330
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 FRIDAY 29 MAY 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      49   16    1050   6     91   23    2350   7
KAMLOOPS     KEL      57   16    1300   6     92   24    2600   6
OKANAGAN     KEL      12   12     700   1     87   21    2300   7
CASTLEGAR    SPOK     54   14    1000  11     86   21    1400  14
CRANBROOK    SPOK     37   11    1100  21     85   18    1550  21
REVELSTOKE   KEL      24   12     850   4     84   19    2250   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NE   9   E   13
CRANBROOK             VR   5   E   11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m         11 C
SPOKANE         1400 m         20 C

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: GOOD




VENTING OUTLOOK SUNDAY THRU 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.     57   14    1300  17    100   20    3950   7
PR. GEORGE   P.G.     84   18    1600  14    100   22    3700   9
SMITHERS     P.G.     72   18    1300  12    100   26    3500   8
WELLS GRAY   P.G.     78   16    2050  10    100   21    4000   7
FT NLSN      F.N.     ##   ##      ##  ##     ##   ##     ###  ##
FT STJOHN    F.N.     84   18    1600  12    100   22    3700   9

*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            NE  17   NE  26
SMITHERS              NE  13   NE  26

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         19 C
FT. NELSON      #### m         ## C

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: GOOD




VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15   15     250   4     28   19     400   7
FRASER VLY   QUIL     18   16     300   4    100   24    3050   7
SRN VRISL    QUIL     14   14     150   4     32   21     500   5
CNTRL VRISL  QUIL     15   15     200   4     32   21     500   5
NRN VRISL    HRDY     15   14     200   5     30   19     500   6
TERRACE      ANT      37   18    1350   3     69   25    1650   6
STEWART      ANT      26   16    1050   2     72   25    1550   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    N    9   NE  11   E   17
PORT HARDY   N   26   N   22   N   22
SANDSPIT     NW  28   N   19   NE  17

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       600 m         20 C
PORT HARDY      1400 m         18 C
ANNETTE         1500 m         22 C

TODAY'S VENTING: FAIR TO POOR




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.


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