Sunday, May 28, 2023

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

SUNDAY, MAY 28, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0412E
SUNSET:  1911E

SUMMERY FEEL TO THE DAY WITH VERY WARM TEMPERATURES UNDER ABUNDANT
SUNSHINE….

If you like summer weather, today is your day. Temperatures have
pushed into the mid 80s here on the summit (likely upper 80s down
below) with a freshening southwest breeze. Skies are completely
clear save for some high thin cirrus seen well off to the south.
As such sunshine is dominating the sky on this Memorial Day.

As mentioned, the wind has been freshening a bit as we entered the
early afternoon hours as mixing from aloft becomes maximized with
surface heating. Gusts have reached into the low 20s mph. The
average speed for the day so far is around 11mph.

Visibility has been somewhat limited due to general haziness. The
view has been holding at around 40 miles all day.

The maximum temperature so far today is 85F, which is 15F above
the normal high of 70F. The minimum temperature so far since
midnight is 56F, which is 4 degrees above the normal low of 52F.

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Today’s Observations:

7 A.M.
Weather: Clear, few cirrus distant SE-SW
Temperature: 63F; Dew Point: 48F; Relative Humidity: 57%
Wind: WSW @ 7 kts
Sea-level pressure: 1021.2 mb; 30.16 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 63F
6-hr Min temp: 56F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 40 212/63/48/2407/016/ FEW CI DSNT SE-SW HAZY/
8/001 58007 10063 20056

10 A.M.
Weather: Clear
Temperature: 77F; Dew Point: 54F; Relative Humidity: 44%
Wind: SW @ 8 kts
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
3-hr Precip:  0.00 inches
BHO SA 1455 CLR 40 200/77/54/2208/012/ HAZY/ 8/000 58012

1 P.M.
Weather: Clear, few cirrus distant SE-SSW
Temperature: 83F; Dew Point: 49F; Relative Humidity: 30%
Wind: SW @ 10G17 kts
Sea-level pressure: 1017.5 mb; 30.05 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 63F
6-hr Precip:  0.00 inches
BHO SA 1755 CLR 40 175/83/49/2210G17/005/ FEW CI DSNT SE-SSW
HAZY/ 8/001 58025 10085 20063

 

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SUMMARY FOR SATURDAY, MAY 27, 2023

TEMPERATURE (DEGREES F)
MAX…….80   NORMAL…..70
MIN…….48   NORMAL…..51
MEAN……64   NORMAL…..60

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+4
TOTAL DEPARTURE FOR THE MONTH………………..+23 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….1  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………..199  DEPARTURE…….-37
TOTAL HEATING UNITS FOR THE SEASON…………5170  DEPARTURE……-953
TOTAL HEATING UNITS LAST SEASON TO DATE…….5566  DEPARTURE……-396

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………16  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON…………..25  DEPARTURE……..+3
TOTAL COOLING UNITS LAST SEASON TO DATE………50  DEPARTURE…….-25

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E23 SSW @  05:05 P.M.
VECTOR #1 (1-Sec)……….23 SSW @  05:05 P.M.
VECTOR #2 (1-Sec)……….24 SSW @  05:18 P.M.
DAVIS #1……………….25 S   @  05:18 P.M.
DAVIS #2 ………………29 S   @  06:49 P.M.
RMY #1 (Instantaneous)…..23 SSW @  05:17 P.M.
RMY #2 (Instantaneous)…..25 SSW @  05:17 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……23     @  11:49 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SSW @  05:20 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17     @  05:27 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19     @  05:27 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 S   @  05:25 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 S   @  05:20 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 SSW @  05:27 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 SSW @  05:27 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16     @  05:27 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.2 SSW [197 total miles] VECTOR #1……………….8.7
VECTOR #2……………….9.1
DAVIS #1………………..8.3 SW
DAVIS #2………………..8.9 WSW
RMY #1………………….8.6 WSW
RMY #2………………….9.1 W
RICHARDS (C5C)…………..8.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..2.55 DEPARTURE…..-0.72
TOTAL PRECIPITATION FOR THE YEAR…………..20.75 DEPARTURE…..-1.30

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 (2022-2023)……34.9 DEPARTURE…..-34.8

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PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

5/1   63/45/54/+1/0.04/0.0/540/64         44 SSE  VEC1 46 SSE RMY 48
5/2   57/43/50/-4/0.22/0.0/144/17         33 S    VEC1 34 S   RMY 35
5/3   55/42/49/-5/0.01/0.0/093/11         25 E    VEC1 25 E   RMY 25
5/4   45/40/43/-11/0.07/0.0/009/01        29 NE   VEC1 29 NE  RMY 29
5/5   59/43/51/-4/0.07/0.0/367/43         18 NE   VEC1 19 NE  RMY 19
5/6   74/43/59/+4/0.00/0.0/847/99         25 NW   VEC1 26 NW  RMY 26
5/7   78/52/65/+10/0.01/0.0/789/92        26 WNW  VEC1 27 W   RMY 28
5/8   74/49/62/+7/0.03/0.0/800/93         32 NW   VEC1 33 NW  RMY 35
5/9   60/45/53/-3/0.00/0.0/819/95         24 NE   VEC1 25 NE  RMY 25
5/10  72/51/62/+6/0.00/0.0/830/96         25 WSW  VEC1 26 WSW RMY 26
5/11  81/53/67/+11/T/0.0/729/84           30 W    VEC1 30 W   RMY 30
5/12  84/57/71/+14/T/0.0/687/79           31 WNW  VEC1 35 WNW RMY 34
5/13  81/58/70/+13/0/0.0/715/82           28 NNW  VEC1 30 NNW RMY 35
5/14  66/47/57/0/0.00/0.0/822/94          28 NNW  VEC1 29 NNW RMY 31
5/15  72/45/59/+2/0.00/0.0/675/77         33 W    VEC1 35 W   RMY 34
5/16  80/55/68/+10/0.00/0.0/500/57        38 SW   VEC1 39 SW  RMY 41
5/17  62/37/50/-8/0.00/0.0/836/95         36 NNW  VEC1 37 NNW RMY 40
5/18  64/34/49/-9/0.00/0.0/847/96         26 SSW  VEC1 28 SSW RMY 28
5/19  68/42/55/-3/0.00/0.0/751/85         36 SSW  VEC1 36 SSW RMY 34
5/20  65/51/58/-1/1.97/0.0/018/02         38 S    VEC1 39 S   RMY 39
5/21  73/55/64/+5/0.09/0.0/533/60         29 SSW  VEC1 30 SSW RMY 31
5/22  59/46/53/-6/0.00/0.0/782/88         36 ENE  VEC1 38 ENE RMY 39
5/23  65/45/55/-4/0.00/0.0/…/..         17 SE   VEC1 18 SE  RMY 18
5/24  75/44/60/0/0.04/0.0/…/..          35 NW   VEC1 36 NW  RMY 38
5/25  67/47/57/-3/0.00/0.0/…/..         25 NNW  VEC1 25 NNW RMY 26
5/26  70/44/57/-3/0.00/0.0/…/..         20 N    VEC1 21 N   RMY 22
5/27  80/48/64/+4/0.00/0.0/…/..         23 SSW  VEC1 23 SSW RMY 23

5/28 The low since midnight is 56F, the daily normal low is 52F

DAILY RECORDS

05/18/2023: NEW RECORD LOW MINIMUM TEMPERATURE OF 34F,
THIS BEATS THE OLD RECORD OF 35F SET IN 2002

05/20/2023: NEW RECORD DAILY PRECIPITATION OF 1.97 INCHES,
THIS BEATS THE OLD RECORD OF 1.65 INCHES SET IN 1969

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: Matt Douglas