Wednesday, April 20, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 20, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE BRINGS CLEAR SKIES AND DRY CONDITIONS,
AFTERNOON WINDS CALM TO LIGHT AND VARIABLE

After yesterday’s 1:00 PM EST observation, temperatures
warmed an additional 5F to a maximum of 55F.  Temperatures
dropped to a minimum of 41F early this morning.

Rising pressure led to another day of clear skies and low
humidities.  At the 1:00 PM EST observation, winds were light
and variable.  Maximum temperature recorded so far for the
day was 55F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few cumulus NNE-SE
Temperature: 45F; Dew Point: 20F; Wind: NNW at 10G21 kts,
Sea-level pressure: 30.20 ins. Hg, rising, then  more slowly
Visibility: 70 miles
6-hr Max temp: 46F
6-hr Min temp: 41F
24-hr precip: 0.00 ins.
BHO SA 1155 250 SCT 70 228/45/20/3310G21/020/ FEW CU NNE-SE/
8/102 51028 10046 20041

10 A.M.
Weather: Clear, few small cumulus NNW-SE
Temperature: 51F; Dew Point: 19F; Wind: NNW at 9G18 kts,
Sea-level pressure: 30.26 ins. Hg, rising, then  more slowly
Visibility: 70 miles
BHO SA 1455 CLR 70 246/51/19/3309G18/026/ FEW SML CU NNW-SE/
8/100 51018

1 P.M.
Weather: Clear, few small cumulus E-SSE and W-NNW, few cirrus WSW-ESE
Temperature: 53F; Dew Point: 22F; Wind: estimated NE at 6 kts,
Wind Direction: light and variable
Sea-level Pressure: 30.24 ins. HG, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 55F
6-hr Min temp: 44F
BHO SA 1755 CLR 70 240/53/22/E0406/024/ FEW SML CU E-SSE AND
W-NNW FEW CI WSW-ESE WND LGT AND VRB/ 8/102 58006 10055 20044

SUMMARY FOR TUESDAY, APRIL 19, 2016

TEMPERATURE (DEGREES F)
MAX…..55   NORMAL…..57
MIN…..41   NORMAL…..39
MEAN….48   NORMAL…..48

DEPARTURE FROM 30-YEAR NORMAL…………………….+0
TOTAL DEPARTURE FOR THE MONTH……………………-33 [-1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17   DEPARTURE……….-8
TOTAL HEATING UNITS FOR THE MONTH………….421   DEPARTURE………+32
TOTAL HEATING UNITS FOR THE SEASON………..4840   DEPARTURE…….-1032
TOTAL HEATING UNITS LAST SEASON TO DATE……6094   DIFFERENCE……-1254

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 NW  AT 11:46 P.M.
ASOS……………………27 NW  AT 11:46 P.M.
DAVIS…………………..24 NW  AT 11:31 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………18 NW  AT 11:42 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 NW  AT 11:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 NW  AT 11:32 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.3 NNE
ASOS……………………9.1
DAVIS…………………..8.1 N [10 Deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.59  DEPARTURE……+0.53
ASOS…………..3.88
TOTAL PRECIPITATION FOR THE YEAR……….16.17  DEPARTURE……-0.89
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……+12.4
TOTAL SNOWFALL FOR THE SEASON…………..57.5  DEPARTURE…….-5.3

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 55/41/48/0/…/0.0/…/…            25 NW  AERO 30 NW  RMY N/A

4/20  low temp since midnight is 41; normal now 40F

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 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

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

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle