Friday, May 28, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY MAY 28, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0413E
SUNSET: 1910E
BRIGHT OVERCAST THROUGH THE MORNING, CLOUDS
THICKEN INTO THE AFTERNOON AHEAD OF OUR NEXT
STORM…
Sunshine was plentiful early in the morning. However,
temperatures were weak to respond as clouds quickly
advanced from the west. There have been splashes
of sun here and there, but skies are primarily
overcast. Temperatures have only reached the upper-50s
with winds averaging 8 MPH since 7AM.
Visibility began at 80 miles slipping to 65 miles
ahead of tonight’s approaching storm. Guidance indicates
a good soaking on the way tonight through the holiday
weekend. While the timing for the precipitation is not
ideal, here at Blue Hill our annual deficit is currently
-4.97″…we can certainly use the water!
The high so far today is 58F, which is 12 degrees below
the normal high of 70F. The low since midnight is 50F,
which is 1 degree below the daily normal low of 51F.
Today’s Observations:
7 A.M.
Weather: Broken Altocumulus/Altostratus (few stratocumulus
E-SE)
Temperature: 52F; Dew Point: 36F; Relative Humidity: 53%
Wind: NE @ 10G16 kts
Sea-level pressure: 30.14 in. Hg; rising, then rising more slowly
Visibility: 80 miles
6-hr Max temp: 55F
6-hr Min temp: 50F
24-hr Precip: 0.00 ins.
BHO SA 1155 110 BKN 80 207/52/36/0410G16/014/ FEW SC E-SE/
8/550 51019 10055 20050
10 A.M.
Weather: Broken Altocumulus/Altostratus (few cumulus all quads)
Temperature: 57F; Dew Point: 39F; Relative Humidity: 50%
Wind: NE @ 8 kts
Sea-level pressure: 30.16 in Hg; rising, then falling
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 110 BKN 65 213/57/39/0508/016/ FEW CU ALQDS/ 8/150 50006
1 P.M.
Weather: Overcast Altocumulus/Altostratus (few cumulus south-north;
few breaks in overcast distant south)
Temperature: 54F, Dew point: 37F; Relative Humidity: 51%
Wind: E @ 9 kts
Sea-level pressure: 30.11 in Hg; falling, then falling more slowly
Visibility: 70 miles
6-hr Max temp: 58F
6-hr Min temp: 52F
6-hr Precip: 0.00 ins.
BHO SA 1755 100 OVC 70 198/54/37/0809/011/ FEW CU S-N
FEW BINOVC DSNT S/ 8/15/ 56015 10058 20052
SUMMARY FOR THURSDAY, MAY 27, 2021
TEMPERATURE (DEGREES F)
MAX…….79 NORMAL…..69
MIN…….57 NORMAL…..51
MEAN……68 NORMAL…..60
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +8
TOTAL DEPARTURE FOR THE MONTH……………….+87 [+3.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….-6
TOTAL HEATING UNITS FOR THE MONTH…………..170 DEPARTURE……-76
TOTAL HEATING UNITS FOR THE SEASON…………5511 DEPARTURE…..-770
TOTAL HEATING UNITS LAST SEASON TO DATE…….5803 DEPARTURE…..-292
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 3 DEPARTURE…….+2
TOTAL COOLING UNITS FOR THE MONTH……………29 DEPARTURE……+12
TOTAL COOLING UNITS FOR THE SEASON…………..29 DEPARTURE……+10
TOTAL COOLING UNITS LAST SEASON TO DATE………14 DEPARTURE……+15
PEAK WIND GUST (MPH):
420C/Official…………..25 N @ 10:33 P.M.
AEROVANE (south tower)…..25 WNW @ 10:50 A.M.
ASOS…………………..26 N @ 10:29 P.M.
DAVIS #1……………….26 W @ 9:35 A.M.
DAVIS #2 (south tower)…..26 W @ 9:07 A.M.
RMY……………………27 @ 11:03 P.M.
VECTOR…………………27 @ 9:35 A.M.
MERLIN…………………25
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 N @ 10:33 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 N @ 10:33 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 W @ 9:43 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 W @ 9:43 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..17 NNE @ 10:30 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..18 @ 10:30 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….10.4 WNW [250 total miles] ASOS………………….9.8
DAVIS #1………………10.8 WNW
DAVIS #2………………11.0 WNW
RMY…………………..9.8 WNW
VECTOR………………..10.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…… 0.00 DEPARTURE….-0.15
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….2.03 DEPARTURE….-1.48
ASOS………….1.97
TOTAL PRECIPITATION FOR THE YEAR………….17.09 DEPARTURE….-4.97
ASOS………..17.25
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
05/01 62/38/50/-3/0.06/0.0/659/78 31 WNW AERO 35 WNW RMY 40
05/02 76/48/62/+9/0.01/0.0/220/26 41 SW AERO 41 SW RMY 46
05/03 67/48/58/+5/0.07/0.0/400/47 21 E AERO 20 E RMY 20
05/04 50/44/47/-7/0.78/0.0/000/00 36 NNE AERO 32 NNE RMY 37
05/05 48/44/46/-8/0.47/0.0/000/00 18 ESE AERO 14 ESE RMY 17
05/06 64/45/55/+1/0.00/0.0/780/91 33 NW AERO 38 NNW RMY 39
05/07 61/43/52/-3/0.00/0.0/516/60 28 ESE AERO 22 ESE RMY 26
05/08 54/40/47/-8/0.00/0.0/069/08 24 SSW AERO 23 SSW RMY 25
05/09 66/42/54/-1/T/0.0/579/67 30 SW AERO 29 SW RMY 34
05/10 60/45/53/-2/0.39/0.0/078/09 21 W AERO 20 W RMY 20
05/11 63/45/54/-2/0.00/0.0/764/88 38 WNW AERO 41 WNW RMY 41
05/12 65/41/53/-3/0.00/0.0/722/83 28 NW AERO M M RMY 31
05/13 69/45/57/+1/0.00/0.0/759/87 22 WNW AERO 21 WNW RMY 21
05/14 76/49/63/+8/0.00/0.0/725/83 23 WNW AERO 23 WNW RMY 25
05/15 75/55/65/+8/0.01/0.0/569/65 24 SSE AERO 26 SSE RMY 26
05/16 78/54/66/+9/0.01/0.0/483/55 36 W AERO 37 W RMY 42
05/17 77/52/65/+8/0.00/0.0/…/.. 20 SSW AERO 21 SSW RMY 21
05/18 81/54/68/+10/T/0.0/…/.. 32 W AERO 30 W RMY 32
05/19 75/55/65/+7/0.00/0.0/…/.. 25 NE AERO 23 NNE RMY 27
05/20 75/52/64/+6/0.00/0.0/…/.. 18 ESE AERO 18 ESE RMY 19
05/21 78/50/64/+5/T/0.0/…/.. 23 S AERO 22 S RMY 26
05/22 87/56/72/+13/T/0.0/…/.. 25 WNW AERO 21 WNW RMY 24
05/23 87/58/73/+14/T/0.0/…/.. 38 NNW AERO 37 NNW RMY 40
05/24 70/49/60/+1/0.00/0.0/…/.. 30 S AERO 35 S RMY 33
05/25 75/47/61/+1/0.00/0.0/…/.. 31 SW AERO 35 SW RMY 34
05/26 86/57/72/+12/…./0.0/…/.. 30 S AERO 36 S RMY 35 TSTM
05/27 79/57/68/+8/…/0.0/…/.. 25 N AERO 25 WNW RMY 27
05/28 The low since midnight is 50F, the daily normal low is 51F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MAY 28
HIGH 92F IN 2016
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946
RECORDS FOR MAY 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945
TODAY’S REPORT PREPARED BY: Andrew Swanson
