Thursday, May 30, 2019

| May 30, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 30, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH LIGHT WINDS AND INCREASING
VISIBILITY….

Rainfall overnight left 0.04 inches in the gauge by
the 7 A.M. observation. A distant fog decreased
as the day went on, bring visibility from 10 miles
this morning to 40 miles this afternoon. Wind has
remained light and variable, blowing at around
4 mph on average. The highest gust today is only
10 mph from the SW. The high so far today
is 60F, 10 degrees below the daily normal maximum
of 70F. The low since midnight is 46F, 6 degrees
below the normal minimum of 52F.

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 49F; Dew Point: 49F; Wind: SW at 3 kts,
Wind: Light and variable
Sea-level pressure: 29.84 ins. Hg, rising steadily
Visibility: 10 miles, distant fog
6-hr Max temp: 49F
6-hr Min temp: 46F
24-hr Precip: 0.04 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E20 OVC 10 104/49/49/2103/984/ DSNT FG
ALQDS WND L/V/ 8/6// 70004 51009 10049 20046

10 A.M.
Weather: Overcast stratus
Temperature: 52F; Dew Point: 48F; Wind: SW at 4 kts,
Wind: Light
Sea-level pressure: 29.83 ins. Hg, falling steadily
Visibility: 35 miles, distant fog
3-hr Precip: 0.00 ins.
BHO SA 1455 E20 OVC 35 101/52/48/2204/983/ DSNT FG
ALQDS WND LGT/ 8/6// 55003

1 P.M.
Weather: Overcast stratus
Temperature: 59F; Dew Point: 55F; Wind: S at 8 kts
Sea-level pressure: 29.81 ins. Hg, falling steadily
Visibility: 40 miles, distant fog
6-hr Max temp: 60F
6-hr Min temp: 49F
6-hr Precip: 0.00 ins.
BHO SA 1755 E20 OVC 40 094/59/55/1908/981/ DSNT FG
ALQDS/ 8/6// 56007 10060 20049

SUMMARY FOR WEDNESDAY, MAY 29, 2019

TEMPERATURE (DEGREES F)
MAX…..51   NORMAL…..70
MIN…..45   NORMAL…..51
MEAN….48   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL…………………..-13
TOTAL DEPARTURE FOR THE MONTH…………………..-62 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17   DEPARTURE……..+11
TOTAL HEATING UNITS FOR THE MONTH………….306   DEPARTURE……..+48
TOTAL HEATING UNITS FOR THE SEASON………..6207   DEPARTURE……..-85
TOTAL HEATING UNITS LAST SEASON TO DATE……5847   DIFFERENCE……+360

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH……………8   DEPARTURE……..-11
TOTAL COOLING UNITS FOR THE SEASON…………..8   DEPARTURE……..-13
TOTAL COOLING UNITS LAST SEASON TO DATE……..58   DEPARTURE……..-50

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 NNW  AT 12:37 A.M.
AERO…………………….21 NNW  AT  3:19 A.M.
ASOS…………………….24 N    AT  3:50 A.M.
DAVIS……………………26 N    AT  3:49 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….17 NNW  AT  3:22 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 N    AT  4:46 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 NNW  AT  4:43 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….6.6 N
ASOS…………………….6.7
DAVIS……………………6.9 N [3 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE…….-0.10
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….4.09  DEPARTURE…….+0.29
ASOS…………..3.89
TOTAL PRECIPITATION FOR THE YEAR……….25.27  DEPARTURE…….+2.92
ASOS………….25.10

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 57/40/49/-4/0.00/0.0/…/..           21 S   AERO 21 SSE  RMY 21
05/02 45/41/43/-10/0.02/0.0/…/..          21 NE  AERO 21 SSW  RMY 20
05/03 60/43/52/-1/…./0.0/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./0.0/…/..           14 ENE AERO 14 ENE  RMY 17
05/05 52/44/48/-6/0.00/0.0/…/..           18 NE  AERO 20 NE   RMY N/A
05/06 58/44/51/-3/…./0.0/…/..           25 NE  AERO 26 ENE  RMY 24
05/07 72/41/57/+2/0.12/0.0/…/..           30 S   AERO 29 S    RMY 30
05/08 67/48/58/+3/0.00/0.0/…/..           20 NE  AERO 20 NE   RMY 19
05/09 60/43/52/-3/0.00/0.0/…/..           21 SE  AERO 21 E    RMY 22
05/10 61/46/54/-1/0.16/0.0/…/..           35 S   AERO 37 S    RMY 37
05/11 68/50/59/+3/…./…/…/..           26 NW  AERO M  M    RMY N/A
05/12 50/36/43/-13/0.68/…/…/..          30 ENE AERO M  M    RMY N/A
05/13 52/38/45/-11/…./…/…/..          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/…./…/…/..          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/…./…/…/..           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/…./…/…/..            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/…./…/…/..    22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/…./…/…/..           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/…./…/…/..           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/…./…/…/..    35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/…/…/..           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/…/…/..            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/…./…/…/..    36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/…./…/…/..    47 NW  AERO 47 NW   RMY 51
05/25 75/47/61/+1/…./…/…/..    M  M   AERO 35 SSW  RMY 39
05/26 85/49/67/+7/…./0.0/…/..           40 W   AERO 38 W    RMY 39
05/27 76/57/67/+7/…./0.0/…/..           30 NE  AERO 22 NE   RMY 27
05/28 57/48/53/-8/…./0.0/…/..           26 E   AERO 22 ESE  RMY 25
05/29 51/45/48/-13/…./0.0/…/..          21 NNW AERO 21 NNW  RMY N/A

05/30 Low temp since midnight is 46F; normal low is 52F

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

RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.47 INS 1948
PEAK GUST 61e MPH NW IN 1945

RECORDS FOR MAY 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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