Sunday, April 10, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 10, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

GUSTY NNW WINDS WITH ARRIVAL OF COLDER DRIER AIR MASS LAST NIGHT
MINIMUM TEMPERATURE AT 26F THIS MORNING–10 DEGREES BELOW NORMAL

Gusty winds to 30 to 35 MPH from the NW and NNW brought in a new
colder drier airmass late last night.  The dew point dropped from
the upper 20’s early last evening to the teens early this morning
with our low temperature dropping to 26 degrees or 10 degrees
below the normal for this date.

BHO Snowiest Aprils, inches (1886-2016):

1) 24.2 in 1996
2) 21.5 in 1894
3) 19.0 in 1887
4) 16.2 in 1916
5) 15.4 in 1907
6) 15.1 in 1997
7) 15.0 in 2016 (thru 4/9)
8) 14.0 in 1982
9) 13.5 in 1987
10) 12.2 in 1917

Today’s Observations:

7 A.M.
Weather: Clear, few small cumulus/cumulus fractus along and
offshore distant ENE-ESE, few cirrus NNE-E-SSE
Temperature: 30F; Dew Point: 17F; Wind: NW at 11 kts,
Wind: Direction variability W-N
Sea-level pressure: 30.17 ins. Hg, rising, then more slowly
Visibility: 60 miles, light distant haze
6-hr Max temp: 29F
6-hr Min temp: 26F
24-hr precip: None
BHO SA 1155 CLR 60 218/30/17/3211/017/ FEW CUFRA/SML CU ALG/OFFSHR
DSNT ENE-ESE FEW CI NNE-E=SSE WND 28V35/ 8/101 51034 10029 20026

10 A.M.
Weather: Clear, [SKC] Temperature: 39F; Dew Point: 12F; Wind: WNW at 7 kts
Wind: Direction variable, WSW-N
Sea-level pressure: 30.23 ins. Hg, rising, then more slowly
Visibility: 70 miles, light distant haze
BHO SA 1455 CLR 70 236/39/12/3007/023/ SKC LGT DSNT HZ
WND 24V35/ 51018

SUMMARY FOR SATURDAY, APRIL 9, 2016

TEMPERATURE (DEGREES F)
MAX…..47   NORMAL…..53
MIN…..29   NORMAL…..35
MEAN….38   NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL…………………….-6
TOTAL DEPARTURE FOR THE MONTH……………………-32 [-3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..27   DEPARTURE……….+6
TOTAL HEATING UNITS FOR THE MONTH………….234   DEPARTURE………+32
TOTAL HEATING UNITS FOR THE SEASON………..4653   DEPARTURE…….-1033
TOTAL HEATING UNITS LAST SEASON TO DATE……5968   DIFFERENCE……-1315

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33 NW  AT 10:38 P.M.*
ASOS……………………35 NW  AT 10:09 P.M.
DAVIS…………………..30 NNW AT 10:03 P.M. RMY 32
FASTEST MILE FOR YESTERDAY…………………22 NNW at 10:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 NNW AT 10:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 NNW AT 10:35 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.3 W
ASOS…………………..8.6 NNW
DAVIS………………….7.1 NW [310 Deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.23  DEPARTURE……+1.71
ASOS…………..3.53
TOTAL PRECIPITATION FOR THE YEAR……….15.81  DEPARTURE……+0.29
ASOS………….16.54

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……+13.6
TOTAL SNOWFALL FOR THE SEASON…………..57.5  DEPARTURE…….-4.2

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)
3….: Data not yet available, records not finalized

4/1   66/54/60/+19/…./0.0/…/..          39 SSW AERO N/A    RMY 43
4/2   54/40/47/+6/…./0.0/…/..           23 SSW AERO N/A    RMY N/A
4/3   40/23/32/-10/…./7.7/…/..          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/…/..          25 NW  AERO N/A    RMY 27
4/6   41/21/31/-12/…./0.0/…/..          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/…/..              41 WSW AERO 45 WSW RMY 42
4/9   47/29/38/-6/0.00/0.0/…/..           33 NW  AERO 39 NW  RMY 32

4/10  low temp since midnight is 26F; normal now 35F

DAILY RECORDS FOR MARCH 2016

3/9/16: NEW DAILY RECORD MAXIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 71F SET BACK IN 2000.

3/10/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
BREAKS PREVIOUS RECORD OF 42F SET AND TIED IN 1977, 2006

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 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967

RECORDS FOR APRIL 11
HIGH 78 IN 1945
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963

TODAY’S REPORT PREPARED BY: Robert Skilling