Sunday, May 22, 2016
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 22, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME
MOST OF RAIN MISSES US THIS MORNING FROM STORM MOVING AWAY OFFSHORE
VIRGA WAS OBSERVED AND A FEW SPRINKLES OCCURRED LOCALLY EARLY
LATER IN MORNING A PERIOD OF VERY LIGHT RAIN WAS OBSERVED
A weak storm system moving northeast well to the southeast of
Cape Cod grazed us with some very light rain by mid-morning
and this was preceded by virga observed between 0500 and 0630.
The rain never wet the ground, hence it was being called
very light.
Today’s Observations:
7 A.M.
Weather: Broken altocumulus, overcast altocumulus, few lower
stratocumulus mostly NE-SSW, bright spots in overcast,
small break in overcast ESE, virga observed past hour
Temperature: 57F; Dew Point: 54F; Wind: NE at 6 kts
Wind: Light
Sea-level pressure: 29.84 ins. Hg, rising slightly
Visibility: 25 miles, except N 20, NE-E 15, WNW 45, light
distant fog, hazy all quadrants
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr precip: 0.00 in.
BHO SA 1155 E70 BKN 120 OVC 25 106/57/54/0506/984/ FEW MSTLY DSNT
SC NMRS BRGT SPOTS IOVC SML BINOVC ESE VIRGA PST HR VSBY N 20 NE-E
15 WNW 45 THN DSNT FG HAZY ALQDS WND LGT/ 8/57/ 53006 10057 20053
10 A.M.
Weather: Overcast stratocumulus, higher clouds visible is
light overcast of altostratus, very light rain occurring began
at 07 mins. past the hour
Temperature: 58F; Dew Point: 52F; Wind: NE at 9 kts,
Sea-level pressure: 29.85 ins. Hg, rising slightly
Visibility: 35 miles, WNW 45 miles, light haze
BHO SA 1455 E17 OVC 35R- 109/58/52/0509/985/ HIER CLDS VSB AT E100
BRGHT SPTS IOVC LGT HZ PCPN VRY LGT WND 01V09/ 8/52/ 53003 MANUAL
6000/
1 P.M.
Weather: Scattered altocumulus (2 layers) broken altocumulus,
cumulus and stratocumulus distant all quadrants
Temperature: 61F; Dew Point: 46F; Wind: NE at 14G21 kts,
Wind: Direction variable N-E
Sea-level pressure: 29.84 ins. Hg, falling slightly
Visibility: 55 miles
6-hr Max temp: 64F
6-hr Min temp: 57F
BHO SA 1755 100 SCT 130 SCT E180 BKN 220 BKN 250 OVC 50 105/62/46/
0414G21/984/ CU/SC DSNT ALQDS OVC PTLY THN BINOVC DSNT ESE-SSE
WND 01V10/ 8/841 56004 MANUAL 6000/ 10064 20057
SUMMARY FOR SATURDAY, MAY 21, 2016
TEMPERATURE (DEGREES F)
MAX…..74 NORMAL…..68
MIN…..53 NORMAL…..49
MEAN….64 NORMAL…..59
DEPARTURE FROM 30-YEAR NORMAL……………………..+5
TOTAL DEPARTURE FOR THE MONTH…………………….-34 [-1.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………1 DEPARTURE……….-6
TOTAL HEATING UNITS FOR THE MONTH………….230 DEPARTURE………+22
TOTAL HEATING UNITS FOR THE SEASON………..5222 DEPARTURE…….-1021
TOTAL HEATING UNITS LAST SEASON TO DATE……6384 DIFFERENCE……-1162
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 S AT 2:06 P.M.
ASOS……………………22 S AT 2:06 P.M.
DAVIS…………………..21 S AT 2:05 P.M. RMY 21
FASTEST MILE FOR YESTERDAY…………………15 S AT 4:38 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 S AT 4:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 S AT 2:06 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.7 S
ASOS………………….11.0
DAVIS………………….9.8 SSW [200 Deg.]
* Last of several occurrences
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.14 DEPARTURE……-0.47
ASOS…………..2.02
TOTAL PRECIPITATION FOR THE YEAR……….19.08 DEPARTURE……-2.08
ASOS………….19.02
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………..TRACE DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE SEASON…………..57.5 DEPARTURE…….-5.7
PRELIMINARY CLIMATE SUMMARY FOR MAY 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)
….: Data not yet available, records not finalized
5/1 52/39/46/-7/0.08/T/000/00 21 S AERO 22 SE RMY 20
5/2 50/41/46/-7/0.31/0.0/000/00 20 NE AERO 21 NE RMY 18
5/3 48/43/46/-7/0.16/0.0/000/00 16 E AERO 16 E RMY 17
5/4 48/41/45/-9/0.53/0.0/000/00 33 NE AERO 35 NE RMY 34
5/5 44/41/43/-11/0.30/0.0/000/00 39 NNE AERO 41 NNE RMY 39
5/6 54/43/49/-5/0.13/0.0/360/42 28 ENE AERO 29 N RMY 26
5/7 51/43/47/-8/…/0.0/000/00 25 NE AERO 25 NE RMY 23
5/8 60/46/53/-2/…/0.0/284/33 47 W AERO 53 W RMY 49
5/9 65/43/54/-1/0.00/0.0/743/86 40 W AERO 44 W RMY 40
5/10 69/40/55/0/0.00/0.0/806/93 22 W AERO 25 WNW RMY 22
5/11 76/50/63/+7/0.00/0.0/808/93 22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/+9/0.00/0.0/819/94 23 NNE AERO 25 S RMY 23
5/13 74/52/63/+7/0.21/0.0/079/09 27 S AERO 27 S RMY 26
5/14 78/54/66/+9/0.00/0.0/656/75 35 SSW*AERO 40 SSW RMY 37
5/15 60/41/51/-6/0.00/0.0/588/67 50 W AERO 54 W RMY 49
5/16 58/38/48/-9/0.00/0.0/800/91 45 W* AERO 51 WNW RMY 49
5/17 69/47/58/+1/0.00/0.0/344/39 32 W AERO 38 W RMY 38
5/18 64/48/56/-2/0.00/0.0/804/91 24 NE AERO 26 NNW RMY N/A
5/19 66/49/58/0/0.26/0.0/…/.. 23 WNW AERO 26 WNW RMY 25
5/20 73/46/60/+2/0.00/0.0/…/.. 20 SSE AERO 22 SSE RMY 21
5/21 74/53/64/+5/0.00.0.0/…/.. 21 S AERO 23 S RMY 21
5/22 low temp since midnight is 53F; normal low now 50F
* Last of several occurrences
* All sunshine data corrected to astronomical minutes.
DAILY RECORDS FOR MAY 2016
5/1/16: DAILY RECORD SNOWFALL OF A TRACE,
TIES PREVIOUS RECORDS SET IN 1905, 1917, 1921, and 1995
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 22
HIGH 93F IN 1911
LOW 35F IN 1907
PRECIP 3.75 INCHES IN 1920
PEAK GUST 49e MPH SSW IN 1947
RECORDS FOR MAY 23
HIGH 92F IN 1964,1992
LOW 38F IN 1976
PRECIP 0.97 INS IN 1979
PEAK GUST 49e MPH W IN 1945
TODAY’S REPORT PREPARED BY: Robert Skilling/Jonathan O’Brien
