BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 16, 2005
ALL TIMES ARE IN EASTERN STANDARD TIME [unless otherwise noted]

SUNNY AND COOL TODAY...
APRIL CONTINUES WARMER THAN NORMAL...
The sky has been nearly completely free of clouds this morning,
with just a few cirrus off to the southeast.  The high and low
temperature so far of 55 and 35 are very close to the normals of
55 and 37.  There was an inversion of temperature this morning,
with a low temperature of 24 in the Neponset Valley at Norwood
Airport, 11 degrees colder than on the summit.  Visibility has
been high today at 70-75 miles.


Today's observations:

7 A.M. EST
Weather: Clear
Temperature: 43F, Dew point: 16F, Wind: NE 10 mph
Sea-level pressure: 30.62 inches, rising
Visibility: 75 miles
BHO SA 1155 CLR 75 370/43/16/0509/062/ THN K LYR ALG HRZN S-NNE/
53024 10042 20035

10 A.M. EST
Weather: Clear with a few cirrus
Temperature: 49F, Dew Point: 12F, Wind: NE 9 mph
Visibility: 70 miles
Sea-level pressure: 30.61 inches, falling
BHO SA 1455 CLR 70 367/49/12/0408/061/ FEW CI DSNT SE-S WND LGT AND
VRB/ 8/001 58003

1 P.M. EST
Weather: Clear
Temperature: 53F, Dew Point: 9F, Wind: NE 10G20 mph
Visibility: 70 miles, haze above horizon to NE
Sea-level pressure: 30.23 inches, rising
BHO SA 1755 CLR 70 343/53/9/0509G17/054/ H LYR ABV HRZN NNE-NE/
58024 10055 20043


WEATHER SUMMARY FOR FRIDAY, APRIL 15

TEMPERATURE (DEGREES F)
MAX.....48   NORMAL.....55    ASOS.....48 AT 3:38 P.M.
MIN.....34   NORMAL.....37    ASOS.....34 AT 5:29 A.M.
MEAN....41   NORMAL.....46
DEPARTURE FROM 30-YEAR NORMAL......-5
TOTAL DEPARTURE FOR THE MONTH.....+46  (+2.9 DEGREES/DAY)

HEATING DEGREE DAY INFORMATION
TOTAL HEATING DEGREE DAYS FOR FRIDAY.........24   DEPARTURE.....+5
TOTAL HEATING DEGREE DAYS FOR THE MONTH.....274   DEPARTURE....-46
TOTAL HEATING DEGREE DAYS FOR THE SEASON...5737   DEPARTURE....-47
TOTAL HEATING DEGREE DAYS FOR LAST YEAR....5825   DIFFERENCE...-88

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY........35 NE AT 9:53 A.M.
                   AEROVANE.........34 NE AT 9:53 A.M.
                   ASOS.............32 NE AT 10:36 A.M.
                   DAVIS............34 NNE AT 8:37 A.M.
FASTEST MILE FOR YESTERDAY..........25 NE AT 8:35 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.......24 NE AT 10:51 A.M.
AVERAGE WIND SPEED AND DIRECTION...12.6 NE
                   ASOS............12.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.04   DEPARTURE....-0.21
                         ASOS..............2.04
TOTAL PRECIPITATION FOR THE YEAR..........18.50   DEPARTURE....+2.77
                         ASOS.............17.52*
*EXCLUDES 3.19 INCHES OF ERRONEOUS PRECIPITATION RECORDED FROM 1/23-1/28.

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0   DEPARTURE.....-0.1
TOTAL SNOWFALL FOR THE MONTH................0.2   DEPARTURE.....-1.4
TOTAL SNOWFALL FOR THE SEASON.............119.4*  DEPARTURE....+60.6
* THIRD GREATEST SEASONAL SNOW TOTAL ON RECORD.


PRELIMINARY CLIMATE SUMMARY FOR APRIL 2005......CALENDAR DAY DATA
DATA REPORTED:
DATE  MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST

AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available

4/1   56/36/46/+5/0.01/0/283/37           23 MPH SE
4/2   56/35/46/+4/1.04/0/000/00           53 MPH SE
4/3   53/39/46/+4/0.63/0/254/33           54 MPH SE  Aero 55 MPH SE
4/4   52/37/45/+3/0.01/0/131/17           32 MPH W
4/5   63/35/49/+6/0/0/721/93              32 MPH WNW Aero 35 MPH WNW
4/6   66/43/55/+12/0/0/591/76             25 MPH S
4/7   70/44/57/+14/0.07/0/164/21          46 MPH SSW
4/8   56/43/50/+6/0.25/0/212/27           32 MPH NW
4/9   58/39/49/+5/0/0/786/100             22 MPH NW
4/10  70/39/55/+11/0/0/742/94             38 MPH NNE
4/11  48/36/42/-3/0/0/744/94              32 MPH NNE
4/12  48/28/38/-7/0.03/0.2/413/52         32 MPH NE
4/13  50/28/39/-6/0/0/427/78              22 MPH WNW
4/14  50/36/43/-3/0/0/.../..              37 MPH NE  Aero 35 MPH NE
4/15  48/34/41/-5/0/0/.../..              35 MPH NE  Aero 34 MPH NE
4/15  ..overnight low 35

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR APRIL 16
HIGH 87 IN 1896
LOW  23 IN 1943
PRECIP 2.45 IN. IN 1929
SNOWFALL 2.0 IN. IN 1904, 1962
PEAK GUST 63 MPH SSE IN 1996

RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW  21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 58 MPH NW IN 1994

TODAY'S REPORT BY: Mike Iacono