Friday, April 14, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 14, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE AND LIGHT WINDS BRING DRY MILD AIR TO GREAT BLUE HILL

High pressure moved in bringing dry air and light winds to Great
Blue Hill. Temperatures have been slightly above normal but more
seasonable than the high temperatures we saw last week. We had a high
of 62F by 1PM. Normal for today is 55F.

With a shift of winds from the south to the northwest the haze we saw
earlier this week has cleared. Skies also cleared throughout the
day and we had excellent visibility of 80 miles during each of our
observations.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 45F; Dew Point: 28F; Wind: NNW at 7 kts
Sea-level pressure: 30.39 ins. Hg, rising unsteadily
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 40F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 E250 SCT 80 292/45/28/3407/039/ 8/004 52013 10045 20040

10 A.M.
Weather: Sky clear, few cumulus ESE and few cirrus NE-SSW
Temperature: 56F; Dew Point: 24F; Wind: N at 7 kts,
Sea-level pressure: 30.40 ins. Hg, increasing the steady
Visibility: 80 miles
BHO SA 1455 CLR 80 295/56/24/3607/040/ FEW CU ESE FEW CI NE-SSW
8/101 52003

1 P.M.
Weather: Few cumulus ESE-N
Temperature: 62F; Dew Point: 24F; Wind: Variable at 6 kts,
Wind speed: Light
Sea-level pressure: 30.37 ins. Hg, decreasing, then more rapidly
Visibility: 80 miles
6-hr Max temp: 62F
6-hr Min temp: 46F
BHO SA 1755 CLR 80 283/62/24/VRB06/037/ FEW CU ESE-N/ 8/100 57012
10062 20046

SUMMARY FOR THURSDAY, APRIL 13, 2017

TEMPERATURE (DEGREES F)
MAX…..58   NORMAL…..55
MIN…..40   NORMAL…..37
MEAN….49   NORMAL…..46

DEPARTURE FROM 30-YEAR NORMAL…………………….+3
TOTAL DEPARTURE FOR THE MONTH……………………+55 [+4.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16   DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE MONTH………….229   DEPARTURE………-52
TOTAL HEATING UNITS FOR THE SEASON………..5131   DEPARTURE……..-634
TOTAL HEATING UNITS LAST SEASON TO DATE……4735   DIFFERENCE…….+396

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL HEATING UNITS FOR YESTERDAY……………3   DEPARTURE……….+3
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……………….28  WNW  AT 12:53 A.M.
AERO……………………31  NW   AT  1:35 P.M.
ASOS……………………29  NNW  AT  3:44 P.M.
DAVIS…………………..26  NW   AT 12:54 P.M. RMY 30
FASTEST MILE FOR YESTERDAY…………………19  WNW  AT 12:26 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20  WNW  AT 12:27 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19  WNW  AT 12:27 P.M.
AVERAGE WIND SPEED AND DIRECTION………….11.3  NW
ASOS………………….10.3
DAVIS………………….9.9 NNW [329 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….4.27  DEPARTURE……+2.07
ASOS…………..4.28
TOTAL PRECIPITATION FOR THE YEAR……….18.39  DEPARTURE……+2.19
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…….+0.7
TOTAL SNOWFALL FOR THE SEASON…………..66.4  DEPARTURE…….+4.7

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

4/13 Low temp since midnight is 40F; normal low is now 37F

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 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 2.22 IN. IN 1895
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943

RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan