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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MAY 21, 2005
ALL TIMES ARE IN EASTERN STANDARD TIME [unless otherwise noted]

CLOUDS AND RAIN MOVE IN FROM LARGE OCEAN STORM...

This morning has been cloudy with the sun only occasionally
visible through stratocumulus and altostratus.  Rain showers
began at 1:55 PM EDT and it became steady light rain shortly
after that time.


Today's observations:

7 A.M. EST
Weather: Overcast with stratocumulus and altostratus
Temperature: 48F, Dew point: 46F, Wind: NNE 12 mph
Sea-level pressure: 29.91 inches, rising
Visibility: 8 miles
BHO SA 1155 E10 BKN 100 OVC 8 129/48/46/0310/991/ HAZY/ 8/71/
53003 10048 20046

10 A.M. EST
Weather: Overcast with stratocumulus and altostratus
Temperature: 50F, Dew point: 44F, Wind: NNE 14G25 mph
Sea-level pressure: 29.91 inches, steady
Visibility: 35 miles
BHO SA 1455 E15 BKN 100 OVC 35 129/50/44/0212G22/991/ SUN DMLY VSBL/
8/51/ 50000

1 P.M. EST
Weather: Light rain shower and overcast with stratocumulus,
altocumulus lenticularis, and altostratus
Temperature: 50F, Dew point: 41F, Wind: N 15G28 mph
Sea-level pressure: 29.89 inches, falling
Visibility: 50 miles; 30 miles ne-se, 70 miles w-nw
BHO SA 1755 E45 SCT 70 SCT 100 OVC 50RW- 122/50/41/0113G24/989/ RW-B55
ACSL SW-NNW HIRS CLDS VSBL AND BINOVC DSNT SW-NW VSBY NE-SE 30 W-NW 70
PK WND 0126/40/ 8/57/ 55007 6000/ 10051 20048


WEATHER SUMMARY FOR FRIDAY, MAY 20

TEMPERATURE (DEGREES F)
MAX.....66   NORMAL.....68    ASOS.....65 AT 2:01 P.M.
MIN.....45   NORMAL.....48    ASOS.....46 AT MIDNIGHT P.M.
MEAN....56   NORMAL.....58
DEPARTURE FROM 30-YEAR NORMAL......-2
TOTAL DEPARTURE FOR THE MONTH.....-86  (-4.5 DEGREES/DAY)

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY........24 S AT 3:16 P.M.*
                   AEROVANE.........26 S AT 3:02 P.M.
                   ASOS.............22 S AT 3:33 P.M.
                   DAVIS............27 S AT 3:01 P.M.
FASTEST MILE FOR YESTERDAY..........18 S AT 3:12 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE.......18 S AT 6:47 P.M.
AVERAGE WIND SPEED AND DIRECTION...10.3 SSW
                   ASOS............10.3
*LAST OF SEVERAL OCCURRENCES

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.03   DEPARTURE....-0.42
                         ASOS..............1.97
TOTAL PRECIPITATION FOR THE YEAR..........23.12   DEPARTURE....+2.87
                         ASOS.............22.00*
*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......0.0
TOTAL SNOWFALL FOR THE MONTH................0.0   DEPARTURE.....-0.1
TOTAL SNOWFALL FOR THE SEASON.............119.4   DEPARTURE....+59.3


PRELIMINARY CLIMATE SUMMARY FOR MAY 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

5/1  57/44/51/-1/0.14/118/14              33 MPH WNW
5/2  63/39/51/-1/0.05/593/70              43 MPH S
5/3  58/38/48/-5/0/604/71                 30 MPH WSW
5/4  59/40/50/-3/T/400/47                 21 MPH E
5/5  60/38/49/-4/0/777/91                 23 MPH E
5/6  54/42/48/-6/0.08/103/12              26 MPH NNE
5/7  44/39/42/-12/1.19/000/00             58 MPH N
5/8  47/39/43/-11/0.22/000/00             43 MPH NNW
5/9  52/43/48/-7/0.04/026/03              36 MPH N
5/10 64/46/55/0/0/502/58                  20 MPH E
5/11 75/46/61/+6/0/807/93                 27 MPH S
5/12 60/41/51/-5/0/835/96                 40 MPH NW
5/13 64/35/50/-6/0/846/97                 28 MPH WNW
5/14 64/47/56/-1/T/288/33                 21 MPH E
5/15 58/41/50/-7/0.14/132/15              24 MPH N
5/16 57/41/49/-8/0.11/193/22              21 MPH ENE
5/17 65/47/56/-1/0/343/39                 21 MPH ESE
5/18 59/45/52/-6/0.01/203/23              28 MPH N
5/19 62/42/52/-6/0.05/.../..              25 MPH WNW
5/20 66/45/56/-2/0/.../..                 24 MPH S
5/21 ..overnight low 45


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

RECORDS FOR MAY 21
HIGH 92F IN 1921
LOW  35F IN 1907
PRECIP 1.61 INS IN 1954
PEAK GUST 69 MPH NW IN 1996

RECORDS FOR MAY 22
HIGH 93F IN 1911
LOW  35F IN 1907
PRECIP 3.75 INCHES IN 1920
PEAK GUST 49e MPH SSW IN 1947

TODAY'S REPORT BY: Mike Iacono