Sunday, April 16, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 16, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPS RISE INTO THE MID 80S, WINDS GUSTING UP TO 38 MPH

A warm front moving across the region left 0.01 in. of precip.
last night.  Yesterday’s max. temperature of 68F had been
reached by 8:00AM EST today, and temperatures continued to rise
through the early afternoon.  The max. at 1:00PM was 85F.

Hazy conditions continued and limited visibility to 40-50 miles
at each observation.  Winds had shifted out of the west-
southwest and were gusting up to 38 MPH.  Skies started broken
with cirrus but cleared to scattered cumulus and scattered
cirrus for the 1:00PM ob.

Today’s Observations:

7 A.M.
Weather: Few altocumulus NNE-ENE, broken cirrus
Temperature: 63F; Dew Point: 52F; Wind: WSW at 14G21 kts
Sea-level pressure: 29.90 ins. Hg, falling unsteadily
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 63F
6-hr Min temp: 56F
24-hr precip: 0.01 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 E250 BKN 40 124/63/52/2414G21/990/ FEW AC NNE-ENE
DSNT HZ ALQDS/ 8/032 57003 MANUAL 70001 ASOS 70001 10063 20056

10 A.M.
Weather: Scattered cirrus
Temperature: 79F; Dew Point: 50F; Wind: WSW at 14G22 kts
Sea-level pressure: 29.85 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze in all directions
BHO SA 1455 250 SCT 40 107/79/50/2514G22/985/ DSNT HZ ALQDS/ 8/001 58017

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 82F; Dew Point: 46F; Wind: WSW at 19G26 kts,
Peak Wind: 33 kts (38 MPH) WSW at 12:07 P.M. EST
Sea-level pressure: 29.77 ins. Hg, falling, then more quickly
Visibility: 50 miles, distant haze in all directions
6-hr Max temp: 85F
6-hr Min temp: 62F
BHO SA 1755 24 SCT 250 SCT 50 080/82/46/2419G26/977/ PK WND 2533/07
DSNT HZ ALQDS/ 8/101 57027 10085 20062

SUMMARY FOR SATURDAY, APRIL 15, 2017

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..56
MIN…..40   NORMAL…..38
MEAN….54   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+67 [+4.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..11   DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH………….254   DEPARTURE………-65
TOTAL HEATING UNITS FOR THE SEASON………..5156   DEPARTURE……..-646
TOTAL HEATING UNITS LAST SEASON TO DATE……4779   DIFFERENCE…….+377

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH……………3   DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE SEASON…………..3   DEPARTURE……….+3
TOTAL HEATING UNITS LAST SEASON TO DATE………0   DIFFERENCE………+3

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….40 SSW AT 3:55 P.M.
AERO……………………45 SSW AT 3:53 P.M.
ASOS……………………43 SSW AT 3:56 P.M.
DAVIS…………………..47 SW  AT 3:32 P.M. RMY 45
FASTEST MILE FOR YESTERDAY…………………32 SSW AT 4:52 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………33 SSW AT 4:52 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..34 SW  AT 4:52 P.M.
AVERAGE WIND SPEED AND DIRECTION………….16.7 SW
ASOS………………….16.0
DAVIS…………………15.4 WSW [240 deg.] *LAST OF MULTIPLE OCCURRENCES

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….4.28  DEPARTURE……+1.77
ASOS…………..4.29
TOTAL PRECIPITATION FOR THE YEAR……….18.40  DEPARTURE……+1.89
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….2.7  DEPARTURE…….+0.5
TOTAL SNOWFALL FOR THE SEASON…………..66.4  DEPARTURE…….+4.5

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
M:    Missing data

4/1  35/31/33/-8/2.21/2.7/000/00           40 ENE AERO 41 ENE RMY 41
4/2  53/30/42/+1/0.00/0.0/…/..           32 NW  AERO 33 NW  RMY 34
4/3  60/35/48/+6/0.00/0.0/…/..           21 W*  AERO 20 NW  RMY N/A
4/4  42/35/39/-3/0.78/0.0/…/..           41 ESE AERO 43 ESE RMY 42
4/5  41/35/38/-5/0.00/0.0/000/00           21 NNW AERO 20 NNW RMY N/A
4/6  55/35/45/+2/1.27/0.0/000/00           35 SSE AERO 37 S   RMY 37  TSTM
4/7  53/38/46/+3/0.00/0.0/…/..           43 SSW AERO 47 SSW RMY 48
4/8  50/34/42/-2/0.00/0.0/…/..           37 WNW AERO 40 WNW RMY 39
4/9  65/34/50/+6/0.00/0.0/…/..           23 W   AERO 23 W   RMY N/A
4/10 77/45/61/+16/0.00/0.0/…/..          37 S   AERO 37 S   RMY 39
4/11 85/50/68/+23/0.00/0.0/…/..          28 S   AERO 28 S   RMY 30
4/12 68/47/58/+13/0.01/0.0/…/..          26 WNW AERO 28 WNW RMY N/A
4/13 58/40/49/+3/0.00/0.0/…/..           28 WNW AERO 31 NW  RMY 30
4/14 62/40/51/+5/0.00/0.0/…/..           22 NNW AERO 22 NNW RMY 24
4/15 68/40/54/+7/0.01/0.0/…/..           40 SSW AERO 45 SSW RMY 45

4/16 Low temp since midnight is 55F; normal low is now 38F

DAILY RECORDS FOR APRIL 2017

4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,
BREAKS PREVIOUS RECORD OF 78F SET IN 1945

4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
TIES WITH PREVIOUS RECORD SET IN 1955

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

RECORDS FOR APRIL 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.45 IN. IN 1929
SNOWFALL 2.0 IN. IN 1904, 1962
PEAK GUST 73 MPH E IN 2007

RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW 21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 63 MPH ESE IN 2011

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle