BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 21, 2012
ALL TIMES ARE IN EASTERN STANDARD TIME
INCREASING CLOUDS AND HUMIDITY TODAY WITH SOUTH WINDS...
SIGNIFICANT RAINFALL EXPECTED OVER THE NEXT TWO DAYS...
The summit was in dense fog early this morning, though the fog lifted
off the hill shortly after 8 AM EDT. A light rain shower in the early
morning hours and a brief period of drizzle before and after 8 AM EDT
brought only a trace of rainfall. After a morning low of 51, the
temperature has soared once again into the 70s, which is well above
average for mid-April. The dew point has increased to the 50s today
on a southerly breeze, which has kept the relative humidity above 50%
as of early afternoon. The moister air mass is moving in ahead of the
heavier showers and steady rainfall is expected tomorrow and Monday.
Another brush fire has been burning since this morning about 4 miles
SW of the Blue Hill.
The 0.76 inch of precipitation that we've received on the summit from
March 4 - April 20 (a total of 48 days) is only 9% of the normal
precipitation (8.27 ins.) that would be expected over that time frame.
But, thankfully, substantial rainfall is in the forecast later this
weekend!
Today's observations:
7 A.M.
Weather: Sky obscured in light drizzle and dense fog
Temperature: 55F, Dew point: 55F, Wind: S at 10 kts,
Sea-level pressure: 29.84 inches Hg, rising
Visibility: 1/4 mile,
24-hour precipitation: Trace
6-hour min. temp: 51F
BHO SA 1155 W2 X 1/4L-F 106/55/55/1810/984/ LB50 WND 15V21/ 8////
53003 6000/ 10055 20051
10 A.M.
Weather: Scattered stratus, broken stratocumulus, few moderate
cumulus, hazy
Temperature: 63F, Dew Point: 57F; Wind: SSW at 10 kts,
Wind: Direction variable S-SW
Sea-level pressure: 29.83 inches Hg, rising
Visibility: 30 miles
3-hour precipitation: Trace
BHO SA 1455 15 SCT E20 BKN 30 102/63/57/2010/983/ FEW MDT CU HAZY
WND 17V23/ 8/500 56004 6000/
1 P.M.
Weather: Scattered cumulus, few moderate cumulus, hazy
Temperature: 71F, Dew Point: 53F; Wind: SSW at 16G26 kts,
Wind: Direction variable S-SW
Sea-level pressure: 29.78 inches Hg, falling
Visibility: 45 miles, hazy
6-hour max. temp: 74F
6-hour precipitation: Trace
BHO SA 1755 E45 SCT 45 083/71/53/2016G26/978/ FEW MDT CU HAZY
WND 17V23 PK WND 2026/55/ 8/200 56019 6000/ 10074 20055
WEATHER SUMMARY FOR FRIDAY, APRIL 20
TEMPERATURE (DEGREES F)
MAX.....75 NORMAL.....58
MIN.....46 NORMAL.....40
MEAN....61 NORMAL.....49
DEPARTURE FROM 30-YEAR NORMAL......................+12
TOTAL DEPARTURE FOR THE MONTH.....................+133 [+6.5 DEGREES/DAY]
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...............4 DEPARTURE.........-13
TOTAL HEATING UNITS FOR THE MONTH.............282 DEPARTURE........-128
TOTAL HEATING UNITS FOR THE SEASON...........4567 DEPARTURE.......-1307
TOTAL HEATING UNITS LAST SEASON TO DATE......5793 DIFFERENCE......-1226
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............30 S AT 5:48 P.M. *
AERO..................31 S AT 5:48 P.M.
ASOS..................33 S AT 5:49 P.M.
DAVIS.................32 S AT 4:23 P.M. RMY 33
THE FASTEST MILE FOR YESTERDAY...........26 S AT 5:47 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............26 S AT 4:24 P.M.
DAVIS MAXIMUM 2-MINUTE AVERAGE...........25 S AT 4:24 P.M.
AVERAGE WIND SPEED AND DIRECTION.......14.9 S
ASOS................13.9
DAVIS...............13.7 SSW [193 deg.]
* Last of several occurrences.
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace DEPARTURE..........-0.14
ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.35 DEPARTURE..........-2.86
ASOS..............0.32
TOTAL PRECIPITATION FOR THE YEAR...........6.44 DEPARTURE.........-10.77
ASOS..............6.47
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE..........-0.1
TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE..........-2.1
TOTAL SNOWFALL FOR THE SEASON..............24.2 DEPARTURE.........-34.8
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
RMY: RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
4/1 50/34/42/+1/0.14/0.0/360/47 20 SSW AERO 20 MPH SSW RMY N/A
4/2 51/35/43/+2/0.04/T/353/46 35 NNW AERO 33 MPH NNW RMY 35
4/3 57/31/44/+2/0.00/0.0/724/94 36 NW AERO 37 MPH NW RMY 40
4/4 62/38/50/+8/T/0.0/688/89 40 NW AERO 39 MPH NW RMY 43
4/5 51/33/42/-1/0.00/0.0/660/85 29 NW AERO 27 MPH NW RMY 30
4/6 51/31/41/-2/0.00/0.0/623/80 26 NNW AERO 26 MPH NNW RMY 28
4/7 54/32/43/0/0.00/0.0/305/39 31 NW AERO 32 MPH NW RMY 32
4/8 51/37/44/0/0.00/0.0/086/11 32 NW AERO 31 MPH NW RMY 33
4/9 57/43/50/+6/T/0.0/323/41 44 W AERO 42 MPH W RMY 44
4/10 61/40/51/+6/0.00/0.0/600/76 32 W AERO 31 MPH W RMY 34
4/11 57/40/49/+4/0.00/0.0/397/50 21 NE AERO 20 MPH NE RMY 22
4/12 54/39/47/+2/0.16/0.0/127/16 25 NNW AERO 24 MPH NNW RMY 28
4/13 63/36/50/+4/0.00/0.0/782/98 24 W AERO 23 MPH W RMY 25
4/14 70/44/57/+11/0.00/0.0/617/77 25 SSW AERO 27 MPH SSW RMY 28
4/15 75/52/64/+17/T/0.0/426/53 23 W AERO 23 MPH W RMY 25
4/16 89/57/73/+26/0.01/0.0/678/84 28 SSW AERO 30 MPH SSW RMY 32
4/17 83/53/68/+21/0.00/0.0/777/96 28 W AERO 28 MPH W RMY 32
4/18 61/45/53/+5/0.00/0.0/.../.. 27 NNW AERO 27 MPH NNW RMY N/A
4/19 70/44/57/+9/0.00/0.0/.../.. 23 S AERO 22 MPH S RMY 25
4/20 75/46/61/+12/0.00/0.0/.../.. 30 S AERO 31 MPH S RMY 33
4/21 the morning low temp: 51F; the normal low is now 40F
DAILY RECORDS FOR APRIL 2012
4/16 - NEW DAILY RECORD HIGH MAXIMUM TEMP OF 89F;
surpasses the previous record of 87F in 1896.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 IN. IN 1991
SNOWFALL 0.8 IN. IN 1947
PEAK GUST 76e MPH NE IN 1940
RECORDS FOR APRIL 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 1.85 IN. IN 2000
SNOWFALL 3.0 IN. IN 1940
PEAK GUST 68e MPH NW IN 1945
TODAY'S REPORT PREPARED BY: Mike Iacono