Friday, May 20, 2022

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

FRIDAY, MAY 20, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0418E
SUNSET:  1904E

SEASONABLE WITH INCREASING VISIBILITY AND A LIGHT
SOUTHERLY WIND….

We observed warmer conditions today with light southeasterly
winds. Fog limited visibility at the 7 A.M. observation,
but dissipated and left us with 40 miles by 1 P.M. A very
light drizzle was observed around 8 A.M., only leaving a
trace in the gauge.

We are at a rain deficit of -1.56 inches on the month and
-4.06 inches on the year! Fire weather will most likely be
a concern moving into this weekend.

The high so far today is 70F, which is 2 degrees above the
normal maximum of 68F. The low since midnight is 49F, which
is the same as the normal minimum.

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Today’s Observations:

7 A.M.
Weather: Fog
Temperature: 52F; Dew Point: 52F; Relative Humidity: 100%
Wind: ESE @ 2 kts, light and variable
Sea-level pressure: 1016.3 mb; 30.01 in. Hg: rising, then
more slowly
Visibility: 1/2 mile, fog
6-hr Max temp: 52F
6-hr Min temp: 49F
24-hr Precip: 0.00 ins.
BHO SA 1155 1/2F 163/52/52/0902/001/ WND L/V/ 8//// 51042
70000 10052 20049

10 A.M.
Weather: Overcast stratocumulus
Temperature: 56F; Dew Point: 53F; Relative Humidity: 90%
Wind: SE @ 4 kts
Sea-level pressure: 1017.4 mb; 30.03 in Hg: rising, then
more slowly
Visibility: 15 miles, thin fog
3-hr Precip: Trace
BHO SA 1455 15 OVC 15 174/56/53/1304/003/ WND L/V/ 8/8//
51011 6000/

1 P.M.
Weather: Thin overcast cirrostratus, few cumulus
Temperature: 69F, Dew point: 56F; Relative Humidity: 63%
Wind: SSE @ 7 kts
Sea-level pressure: 1016.8 mb; 29.02 in Hg, rising then falling
Visibility: 40 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 52F
6-hr Precip:  Trace
BHO SA 1755 250 -OVC 40 168/69/56/1507/002/ FEW CU ALQDS HAZY/
8/107 55006 6000/ 10070 20052

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SUMMARY FOR THURSDAY, MAY 19, 2022

TEMPERATURE (DEGREES F)
MAX…….60     NORMAL…..68
MIN…….52     NORMAL…..49
MEAN……56     NORMAL…..58

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…….-2
TOTAL DEPARTURE FOR THE MONTH………………+18 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………..9  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………178  DEPARTURE……. -5
TOTAL HEATING UNITS FOR THE SEASON……….5542  DEPARTURE……-528
TOTAL HEATING UNITS LAST SEASON TO DATE…..5500  DEPARTURE…….+42

COOLING DEGREE DAYS (SEASON: JAN 2022 THRU DEC 2022)
TOTAL COOLING UNITS FOR YESTERDAY…………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH………….24  DEPARTURE…….+14
TOTAL COOLING UNITS FOR THE SEASON…………24  DEPARTURE…….+11
TOTAL COOLING UNITS LAST SEASON TO DATE……..1  DEPARTURE…….+20

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….26 S   @ 11:37 A.M.
AEROVANE……………….N/A
VECTOR #2 (Instantaneous)..28     @ 11:37 A.M.
DAVIS #2 ………………33 S   @ 12:02 P.M.
RMY #2 (Instantaneous)…..28 S   @ 11:39 A.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 S  @  7:03 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20    @  7:03 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 S  @  7:03 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 S  @  7:03 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE……OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..7.4 S [178 total miles] VECTOR #2………………8.1
DAVIS #2……………….7.8 S
RMY #2…………………8.0 SSW
RMY #1……….OUT OF SERVICE D/T RENOVATIONS
ASOS…………OUT OF SERVICE D/T RENOVATIONS
VECTOR #1…….OUT OF SERVICE D/T RENOVATIONS
DAVIS #1……..OUT OF SERVICE D/T RENOVATIONS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE  DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH………….0.70  DEPARTURE…..-1.56
TOTAL PRECIPITATION FOR THE YEAR………….16.98  DEPARTURE…..-4.06

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
M:    Missing data

5/01  69/40/55/+2/0.00/786/93             25 SSE AERO 25 SSE RMY 27
5/02  58/42/50/-4/0.21/059/07             21 NE  AERO 19 NE  RMY 20
5/03  57/43/50/-4/0.23/229/27             23 ENE AERO 22 ENE RMY 24
5/04  52/45/49/-5/0.14/000/00             19 NW  AERO 18 SE  RMY 19
5/05  70/46/58/+3/0.00/666/78             23 NNW AERO 21 NNW RMY 23
5/06  63/49/56/+1/0.00/051/06             20 S   AERO 18 S   RMY 21
5/07  49/42/46/-9/0.00/112/13             48 ENE AERO 51 ENE RMY 50
5/08  51/40/46/-9/0.00/621/72             43 ENE AERO N/A    RMY 47
5/09  54/39/47/-9/0.00/838/97             43 ENE AERO N/A    RMY 46
5/10  57/43/50/-6/0.00/866/100            44 ENE AERO N/A    RMY 46
5/11  58/43/51/-5/0.00/182/21             36 NE  AERO N/A    RMY 38
5/12  68/48/58/+1/T/487/56                17 ENE AERO N/A    RMY 18
5/13  82/56/69/+12/0.00/619/71            33 SSW AERO N/A    RMY 34
5/14  85/63/74/+17/0.02/621/71            33 SW  AERO N/A    RMY 34
5/15  78/62/70/+13/0.03/394/45            23 SW  AERO N/A    RMY 24
5/16  83/58/71/+13/0.07/623/71            40 SSW AERO N/A    RMY 45
5/17  74/53/64/+6/T/…/..                44 W   AERO N/A    RMY 47
5/18  73/49/61/+3/…./…/..             39 NW  AERO N/A    RMY 41
5/19  60/52/56/-2/…./…/..             26 S   AERO N/A    RMY 28

5/20  The low since midnight is 49F, the daily normal low is 49F

DAILY RECORDS

05/14/2022: NEW HIGH MINIMUM TEMPERATURE RECORD OF 63F,
PREVIOUS RECORD WAS 60F SET IN 1944.

05/14/2022: TIED RECORD HIGH OF 85F, PREVIOUSLY SET IN 1961

05/15/2022: NEW RECORD HIGH MINIMUM WAS SET OF 62F,
PREVIOUS RECORD WAS 58F set in 1896, 1961, and 2004.

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

RECORDS FOR MAY 20
HIGH 91F IN 1975,1996
LOW 37F IN 1948, 2002
PRECIP 1.65 INCHES IN 1969
PEAK GUST 57 MPH S IN 1963, WNW IN 1982

RECORDS FOR MAY 21
HIGH 92F IN 1921
LOW 35F IN 1907
PRECIP 1.61 INS IN 1954
PEAK GUST 74 MPH WSW IN 2006

TODAY’S REPORT PREPARED BY: Benjamin Turner