Tuesday, April 19, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 19, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

PASSING MORNING COLD FRONT BRINGS RAIN SHOWERS
AND CLOUDY SKIES

At the 7:00AM EST observation, a total of 0.05 inches
of precipitation was measured from overnight rain showers.
Temperatures dropped to a morning low of 41F.  Skies remained
mostly cloudy or overcast for most of the day.

Humidities decreased through the day from 92% at 7:00 AM EST
to 68% at 1:00PM EST.  A maximum temperature of 49F occurred
by the 1:00PM EST observation, 8F below normal.

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, few cumulus fractus in all directions
Temperature: 43F; Dew Point: 41F; Wind: NE at 9 kts,
Sea-level pressure: 29.98 ins. Hg, falling, then rising
Visibility: 20 miles, thin fog in all directions
6-hr Max temp: 45F
6-hr Min temp: 41F
24-hr precip: 0.05 ins.
BHO SA 1155 E50 BKN 20 153/43/41/0409/998/ FEW CUFRA ALQDS
THN FG ALQDS/ 8/500 53001 ASOS 70005 MANUAL 70005 10045 20041

10 A.M.
Weather: Overcast stratocumulus
Temperature: 45F; Dew Point: 38F; Wind: NE at 10G16 kts,
Wind: Direction variable N-E
Sea-level pressure: 30.03 ins. Hg, falling, then rising
Visibility: 35 miles, thin fog in all directions
BHO SA 1455 E36 OVC 35 168/45/38/0510G16/003/ WND 01V08
THN FG ALQDS/ 8/5// 53015

1 P.M.
Weather: Broken stratocumulus
Temperature: 47F; Dew Point: 37F; Wind: ENE at 6 kts,
Sea-level Pressure: 30.02 ins. HG, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 49F
6-hr Min temp: 43F
BHO SA 1755 E26 BKN 70 165/47/37/0606/002/ 8/500 56003
10049 20043

SUMMARY FOR MONDAY, APRIL 18, 2016

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..57
MIN…..45   NORMAL…..39
MEAN….56   NORMAL…..48

DEPARTURE FROM 30-YEAR NORMAL…………………….+8
TOTAL DEPARTURE FOR THE MONTH……………………-33 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………9   DEPARTURE……….-8
TOTAL HEATING UNITS FOR THE MONTH………….404   DEPARTURE………+32
TOTAL HEATING UNITS FOR THE SEASON………..4823   DEPARTURE…….-1032
TOTAL HEATING UNITS LAST SEASON TO DATE……6076   DIFFERENCE……-1253

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 ENE AT 10:46 A.M.
ASOS……………………29  E  AT 10:47 A.M.
DAVIS…………………..26 ENE AT 10:36 A.M. RMY 28
FASTEST MILE FOR YESTERDAY…………………21 ENE AT 10:46 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22  E  AT 10:47 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 ENE AT 10:46 A.M.
AVERAGE WIND SPEED AND DIRECTION……………10.8 E
ASOS……………………10.9
DAVIS…………………..9.8 ENE [70 Deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05  DEPARTURE……-0.09
ASOS…………..0.05
TOTAL PRECIPITATION FOR THE MONTH……….3.59  DEPARTURE……+0.66
ASOS…………..3.88
TOTAL PRECIPITATION FOR THE YEAR……….16.17  DEPARTURE……-0.76
ASOS………….16.89

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH……………15.0  DEPARTURE……+12.5
TOTAL SNOWFALL FOR THE SEASON…………..57.5  DEPARTURE…….-5.2

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/ AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

4/1  66/54/60/+19/…./0.0/092/12          39 SSW AERO N/A    RMY 43
4/2  54/40/47/+6/…./0.0/023/03           23 SSW AERO N/A    RMY N/A
4/3  40/23/32/-10/…./7.7/354/46          46 W   AERO N/A    RMY 55
4/4  28/21/25/-17/0.68/7.3/000/00          29 NNE AERO N/A    RMY 25
4/5  35/19/27/-16/0.00/0.0/660/85          25 NW  AERO N/A    RMY 27
4/6  41/21/31/-12/…./0.0/483/62          44 S   AERO N/A    RMY N/A
4/7  56/41/49/+6/…./0.0/000/00           53 SSE AERO 59 SSE RMY 55
4/8  52/32/42/-2/T/0.0/353/45              41 WSW AERO 45 WSW RMY 42
4/9  47/29/38/-6/0.00/0.0/417/53           33 NW  AERO 39 NW  RMY 32
4/10 49/26/38/-7/0.01/0.0/735/93           30 NW  AERO 32 NW  RMY 31
4/11 58/40/49/+4/0.00/T/182/23             47 S   AERO 52 S   RMY N/A
4/12 59/37/48/+3/0.30/0.0/040/05           53 S   AERO 60 S   RMY 54
4/13 53/33/43/-3/0.00/0.0/798/100          21 NNW AERO 25 NNW RMY 21
4/14 48/33/41/-5/0.00/0.0/793/99           28 ENE AERO 28 NNE RMY 26
4/15 54/35/45/-2/0.00/0.0/804/100          26 NNE AERO 28 NNE RMY N/A
4/16 52/39/46/-1/0.00/0.0/…/…          36 NNE AERO 31 NNE RMY 34
4/17 62/36/49/+2/0.00/0.0/…/…          20 NNE AERO 20 NNE RMY 19
4/18 67/45/56/+8/…/0.0/…/…           28 ENE AERO 29 NE  RMY 28

4/19  low temp since midnight is 41; normal now 39F

DAILY RECORDS FOR APRIL 2016

4/1/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 54F,
BREAKS PREVIOUS RECORD OF 51F SET IN 1948

4/4/16: NEW DAILY RECORD SNOWFALL OF 7.3 INS,
BREAKS PREVIOUS RECORD OF 3.7 INS SET IN 1975

4/4/16: NEW DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F,
BREAKS PREVIOUS RECORD OF 32F SET AND TIED IN 1896, 1908, 1975

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

RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH] LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 6.0 IN. IN 1887
PEAK GUST 66 MPH E IN 1984

RECORDS FOR APRIL 20
HIGH 88 IN 1927
LOW 18 IN 1897
PRECIP 1.14 IN 1972
SNOWFALL 2.5 IN. IN 1904, 1972
PEAK GUST 76 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle