FPCN39 CWLW 261321
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 TUESDAY 26 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      44   14     700   8     80   19    1750   7
KAMLOOPS     KEL      58   14    1250   7     76   18    1850   7
OKANAGAN     KEL      58   14    1250   7     76   18    1850   7
CASTLEGAR    SPOK     20   10     745   4     95   19    2450   8
CRANBROOK    SPOK      7    9    1080   5    100   19    3950  11
REVELSTOKE   KEL      73   17    1850   7     99   22    2700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   E   22   E   52
CRANBROOK             E   22   E   56

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         NONE
SPOKANE         NONE

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD


VENTING OUTLOOK THURSDAY THRU SATURDAY: 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.     26   14    1300   5     51   19    1700   7
PR. GEORGE   P.G.     48   16    1300   8     86   23    2000  10
SMITHERS     P.G.     36   14    1000   6     50   19    1350   6
WELLS GRAY   P.G.     42   17    1550   7    100   21    2450  14
FT NLSN      F.N.     43   10     925   7     60   23    1250   8
FT STJOHN    F.N.     45   12    1150   8     89   23    2750   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  39   E   37
SMITHERS              NE  24   E   37

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1850 m         24 C
FT. NELSON       750 m         18 C

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     ##   ##     ###  ##     58   15    1950   3
FRASER VLY   QUIL     45   11     900   5     57   15    1900   3
SRN VRISL    QUIL     34   11     850   3     54   15    1800   3
CNTRL VRISL  QUIL     34   11     850   3     51   14    1750   3
NRN VRISL    HRDY     26   11     600   3     55   14    1450   4
TERRACE      ANT      41   11     800   6     60   15    1100   8
STEWART      ANT      21   12     600   2     53   15     950   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   26   N   17   E   37
PORT HARDY   NW  31   N   28   NE  54
SANDSPIT     N   13   NE  24   E   28

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       240 m          9 C
PORT HARDY        95 m          9 C
ANNETTE         1430 m         19 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR.


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


END/MWSO