BLUE HILL METEOROLOGICAL OBSERVATORY, MILTON, MASSACHUSETTS 02186
ELEVATION 635 FT. ABOVE MSL....10 MILES SSW OF BOSTON, MA
SATURDAY, DECEMBER 7, 2002

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DAILY DISCUSSION...

STRONG INVERSION WITH RADIATIONAL COOLING THIS MORNING....
The low temperature at the summit this morning was 20
degrees at 6 AM, while Norwood Airport about 5 miles to
the SW and more than 500 feet lower in elevation recorded
a low of 0 early today.  The hill has warmed to the
mid-30s as of early afternoon, and warmer conditions
will continue until the a new cold front arrives on
Sunday night.  Visibility was relatively low earlier,
but has risen to about 30 miles.
MJI

Today's observations:

7 AM
BHO SA 1155 200 SCT 15 231/22/13/2117/021/ FEW HIR CI
TOTAL NEW SNW PST 24 HRS 0.8 IN/ 8/001 4/006 51007
70006 10022 20020

10 AM
BHO SA 1455 250 -SCT 15 217/29/20/2018/017/ FEW LWR DNS
CI NW-NE PK WND 2027/1453/ 8/001 58014

1 PM
BHO SA 1755 250 -SCT 30 187/36/16/2120G32/008/ PK WND
2132/1750/ 8/001 57030 10036 20022


WINDS AT BLUE HILL FOR FRIDAY, DECEMBER 6
PEAK WIND GUST FOR FRIDAY...........22 MPH NNW AT 12:28 AM
                   AEROVANE.........23 MPH NNW AT 12:28 AM
                   ASOS.............20 MPH WNW AT 9:21 PM
AVERAGE WIND SPEED AND DIR........11.7 MPH, NW
                   ASOS...........12.1 MPH

WINDS AT BLUE HILL FOR SATURDAY, DECEMBER 7
PEAK WIND GUST THROUGH 1 PM..........37 MPH SSW AT 12:50 PM
                   AEROVANE..........39 MPH SSW AT 12:50 PM
                   ASOS..............36 MPH SSW AT 12:51 PM


TEMPERATURES AT BLUE HILL FOR FRIDAY, DECEMBER 6

MAX.....28    NORMAL.....41    ASOS.....29 AT 3:28 PM
MIN.....21    NORMAL.....27    ASOS.....20 AT MIDNIGHT PM
MEAN....25    NORMAL.....34    DEP......-9    DEP FOR MONTH....-67

The month is averaging 11 degrees below normal per day.

HEATING DEGREE DAY UNITS THROUGH FRIDAY, DECEMBER 6
HEATING UNITS FOR FRIDAY............40    DEP.....+9
HEATING UNITS FOR NOVEMBER.........246    DEP....+67
HEATING UNITS FOR THE SEASON......1552    DEP....+84
HEATING UNITS FOR LAST SEASON.....1061    DEP...+491


PRECIPITATION DATA AT BLUE HILL.....
TOTAL PRECIPITATION 24 HRS ENDING 7 AM....0.06 IN    DEP....-0.09 IN
                         ASOS.............0.05 IN
TOTAL PRECIPITATION FOR THE MONTH.........0.47 IN    DEP....-0.43 IN
                         ASOS.............0.36 IN
TOTAL PRECIPITATION FOR THE YEAR.........47.07 INS   DEP....-0.34 IN
                         ASOS............44.16 INS


SNOWFALL DATA AT BLUE HILL...
TOTAL SNOWFALL 24 HRS ENDING 7 AM......0.8 IN     DEP....+0.5 IN
TOTAL SNOWFALL FOR THE MONTH...........6.6 INS    DEP....+4.6 INS
TOTAL SNOWFALL FOR THE SEASON.........16.1 INS    DEP...+10.8 INS


RECORDS FOR DECEMBER 7

HIGH   74 IN 1998
LOW     6 IN 1906
PRE  1.67 INS IN 1953
SNOW  4.0 INS 1886
WIND   76 MPH SE IN 19676 (ESTIMATED)

RECORDS FOR DECEMBER 8

HIGH   62 IN 1966
LOW    -4 IN 1906
PRE  1.54 INS IN 1969
SNOW  2.5 INS IN 2001
WIND   78 MPH W IN 1979 (ESTIMATED)

Daily wind records are for the period 1940-2001. Temperature and
precipitation records are for the full period of record 1885-2001.

Mike Iacono