Wednesday, May 16, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 16, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
CLOUDS INCREASE AFTER A BREEZY PARTLY SUNNY MORNING….
A line of severe thunderstorms moved though beginning
yesterday afternoon around 3:30 P.M. EST and continued
for a few hours ending around 7:00 P.M. Hail and heavy
rain was observed during this time and we measured a
total of 0.74 ins of rainfall. We had our official peak
gust yesterday during the storm of 44 kts (51 MPH) at
4:44 P.M.
The wind shifted yesterday afternoon before the storm
from SSW-NE. This morning was breezy as pressure rose
with a peak gust so far of 27 kts (31 MPH) just before
6:00 A.M. Winds have become lighter this afternoon and
continue to be from the NE.
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken cirrostratus,
few stratocumulus distant along the horizon
Temperature: 52F; Dew Point: 43F; Wind: ENE at 15G24,
Peak wind: 26 kts (30 MPH) ENE at 6:34 A.M.
Sea-level pressure: 30.18 ins. Hg, rising, then more slowly
Visibility: 30 miles, distant fog in all directions
6-hr Max temp: 57F
6-hr Min temp: 51F
24-hr precip: 0.74 ins.
BHO SA 1155 90 SCT E250 BKN 30 220/52/43/0715G24/018/ FEW
SC DSNT ALNG HRZN SE-WNW DSNT FG ALQDS PK WND 0726/34/
8/558 53038 MANUAL 70074 ASOS 70073 10057 20051
10 A.M.
Weather: Broken cirrostratus, broken cirrus, few stratocumulus
distant along the horizon SSE, few altocumulus NW-NNE sun dimly
visible
Temperature: 52F; Dew Point: 43F; Wind: ENE at 9G16 kts
Sea-level pressure: 30.21 ins. Hg, rising unsteadily
Visibility: 40 miles, distant fog in all directions
3-hr precip: 0.00 ins.
BHO SA 1455 E200 BKN 250 BKN 40 229/52/43/0709G16/021/ FEW
SC DSNT ALNG HRZN SSE FEW AC NW-NNE SUN DMLY VSBL DSNT FG
ALQDS/ 8/546 51009
1 P.M.
Weather: Scattered altocumulus, overcast cirrostratus
Temperature: 55F; Dew Point: 44F; Wind: ENE at 9G16 kts
Sea-level pressure: 30.21 ins. Hg, rising then falling now higher
Visibility: 40 miles
6-hr Max temp: 55F
6-hr Min temp: 51F
6-hr precip: 0.00 ins.
BHO SA 1755 180 SCT E250 OVC 40 230/55/44/0609G16/021/ SUN
DMLY VSBL DSNT FG ALQDS/ 8/058 50001 10055 20051
SUMMARY FOR TUESDAY, MAY 15, 2018
TEMPERATURE (DEGREES F)
MAX…..83 NORMAL…..66
MIN…..54 NORMAL…..48
MEAN….69 NORMAL…..57
DEPARTURE FROM 30-YEAR NORMAL…………………….+12
TOTAL DEPARTURE FOR THE MONTH……………………+106 [+6.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..0 DEPARTURE……….-9
TOTAL HEATING UNITS FOR THE MONTH………….82 DEPARTURE………-78
TOTAL HEATING UNITS FOR THE SEASON……….5775 DEPARTURE……..-420
TOTAL HEATING UNITS LAST SEASON TO DATE…..5553 DIFFERENCE…….+222
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4 DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE MONTH…………..36 DEPARTURE………+31
TOTAL COOLING UNITS FOR THE SEASON………….36 DEPARTURE………+29
TOTAL COOLING UNITS LAST SEASON TO DATE……..20 DEPARTURE………+16
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….51 NW AT 4:44 P.M.
AERO……………………50 NW AT 4:43 P.M.
ASOS……………………50 NW AT 4:44 P.M.
DAVIS…………………..50 M AT 4:44 P.M.** RMY 54
FASTEST MILE FOR YESTERDAY…………………40 NW AT 4:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………37 NW AT 4:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..38 M AT 4:44 P.M.**
AVERAGE WIND SPEED AND DIRECTION………….11.8 SSW
ASOS………………….11.8
DAVIS…………………11.9 M**
** Davis direction malfunctioning
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.74 DEPARTURE……+0.62
ASOS…………..0.73
TOTAL PRECIPITATION FOR THE MONTH……….1.35 DEPARTURE……-0.48
ASOS…………..1.30
TOTAL PRECIPITATION FOR THE YEAR……….26.66 DEPARTURE……+6.46
ASOS………….28.22
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE………0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.0 DEPARTURE………0.0
TOTAL SNOWFALL FOR THE SEASON…………..92.8 DEPARTURE…….+30.0
PRELIMINARY CLIMATE SUMMARY FOR MAY 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
5/01 65/39/52/-1/0.00/0.0/625/74 25 WNW AERO 21 WNW RMY 25
5/02 88/59/74/+21/0.00/0.0/584/69 37 WSW AERO 29 WSW RMY 35
5/03 90/67/70/+26/…./0.0/433/51 36 SW AERO 32 WSW RMY 36
5/04 84/67/74/+20/…./0.0/102/12 39 SSW AERO 37 SSW RMY N/A
5/05 73/54/64/+10/0.00/0.0/615/72 56 W AERO 55 W RMY N/A
5/06 65/48/57/+3/0.21/0.0/000/00 24 NE AERO 18 NE RMY 21
5/07 62/49/56/+1/0.00/0.0/713/83 26 ENE AERO 22 NE RMY 24
5/08 73/46/60/+5/0.00/0.0/852/99 25 SSE AERO 21 ESE RMY 23
5/09 74/48/61/+6/…./0.0/768/89 23 ESE AERO 18 ESE RMY 21
5/10 73/48/61/+6/…./0.0/…/.. 33 S AERO 30 S RMY 32
5/11 70/51/61/+5/…./0.0/…/.. 26 WNW AERO 24 NW RMY 28
5/12 51/47/49/-7/0.19/0.0/…/.. 25 E AERO 23 E RMY N/A
5/13 58/46/52/-4/T/0.0/…/.. 20 S AERO 17 S RMY 16
5/14 73/47/60/+3/0.00/0.0/…/.. 23 S AERO 18 S RMY 21
5/15 83/54/69/+12/…./0.0/…/.. 51 NW AERO 50 NW RMY 54 TSTM
5/16 Low temp since midnight is 51F; normal low is now 48F
DAILY RECORDS FOR MAY 2018
5/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 66F SET IN 2001
5/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 66F SET IN 2001
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 16
HIGH 90F IN 1951
LOW 30F IN 1936
PRECIP 2.63 INCHES IN 1954
PEAK GUST 56e MPH NW IN 1952
RECORDS FOR MAY 17
HIGH 90F IN 2017
LOW 34F IN 1956, 1957
PRECIP 2.07 INS IN 1916
PEAK GUST 52 MPH SW IN 1967, W IN 1974
TODAY’S REPORT PREPARED BY: Kaitlin Geagan and Sam Richard
