Friday, January 20, 2023

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

FRIDAY, JANUARY 20, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0708E
SUNSET:  1643E

SNOW RETURNS TO GREAT BLUE HILL…

A rain snow mix began yesterday afternoon just after 2 P.M.
turning over to mostly rain and continuing throughout the night.
We measured at total of 1.12 inches of liquid precipitation at
the 7am observation. Light rain continued until the 8 o’clock
hour when the rain turned back into snow. There was a trace
measured at 10 A.M. and 0.1 inches measured at 1 P.M. We had
a liquid total of 0.11 inches since 7 A.M. So far today a peak
gust of 55 MPH was observed at 0222E. Temperatures have decreased
today from 35F at midnight and have stayed consistent around 32F
for most of the day.

The high so far today is 35F, occuring at midnight which is 1
degree above the normal maximum of 34F. The low since midnight is
31F, which is 13 degrees above the normal minimum of 18F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, 300 ft vertical visibility, very light rain
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: N @ 9G16 kts
Sea-level pressure: 1002.1 mb; 29.59 in. Hg: falling then more slowly
Visibility: 1/2 mile, fog
6-hr Max temp: 35F
6-hr Min temp: 32F
24-hr Precip:  1.12 ins.
24-hr Snowfall: T
Snow Depth: 0 ins.
BHO SA 1155 X W3 1/2L-F 021/32/32/3509G16/959/ VRY LGT PCPN,
NEW SNW PST 24 HRS TRACE/ 8//// 4/000 55002 70112 10035 20032

10 A.M.
Weather: Overcast stratus, snow
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: NNE @ 13G13 kts
Sea-level pressure: 1003.1 mb; 29.62 in. Hg: rising, then
more slowly
Visibility: 2 miles, fog
3-hr Precip:  0.02 ins
3-hr Snowfall: Trace
BHO SA 1455 E8 OVC 2S-F 031/32/32/0213G13/962/ VSBY SW-NNE ½,
NEW SNW PST 3 HRS TRACE/ 8/6// 51010 6002/

1 P.M.
Weather: Sky obscured, 300 ft vertical visibility, snow
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: N @ 6G11 kts
Sea-level pressure: 1003.3 mb; 29.63 in. Hg: rising, then
more quickly
Visibility: 1/2 mile, fog
6-hr Max temp: 33F
6-hr Min temp: 31F
6-hr Precip:  0.11 ins
6-hr Snowfall: 0.1 ins
Snow Depth: Trace
BHO SA 1755 X W3 1/2S-F 033/32/32/3406G11/963/ NEW SNW PST 3
HRS 0.1 INS/ 8//// 55002 6011/ 10033 20031

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SUMMARY FOR THURSDAY, JANUARY 19, 2023

TEMPERATURE (DEGREES F)
MAX…….38   NORMAL…..34
MIN…….32   NORMAL…..18
MEAN……35   NORMAL…..26

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+9
TOTAL DEPARTURE FOR THE MONTH……………….+172 [+9.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………30  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..550  DEPARTURE……-173
TOTAL HEATING UNITS FOR THE SEASON…………2460  DEPARTURE……-473
TOTAL HEATING UNITS LAST SEASON TO DATE…….2933  DEPARTURE……-147

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….32 NNE @ 23:23 P.M.
VECTOR #2 (Instantaneous)..33     @ 23:24 P.M.
DAVIS #2 ………………32 E   @ 23:23 P.M.
RMY #2 (Instantaneous)…..38 NNE @ 23:24 P.M.
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………………22 NNE @ 23:23 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23     @ 23:24 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 E   @ 23:24 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 NNE @ 23:24 P.M.
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……..8.8 NNE [211 total miles] VECTOR #2………………9.5
DAVIS #2……………….9.1 N
RMY #2…………………9.5 ENE
RMY #1……….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……..1.12 DEPARTURE……0.99
TOTAL PRECIPITATION FOR THE MONTH…………..3.75 DEPARTURE……0.91
TOTAL PRECIPITATION FOR THE YEAR……………3.75 DEPARTURE……0.91

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH………………..5.2 DEPARTURE……-5.7
TOTAL SNOWFALL FOR THE SEASON (2022-2023)…….7.9 DEPARTURE…..-18.1

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

1/1   53/38/46/+17/0.04/0.0/412/75        39 WNW  VEC1 N/A    RMY 60
1/2   49/33/41/+13/0.00/0.0/044/08        39 WNW  VEC1 N/A    RMY 39
1/3   48/37/43/+15/0.50/0.0/000/00        23 S    VEC1 N/A    RMY 24
1/4   43/37/40/+12/0.31/0.0/000/00        23 NE   VEC1 N/A    RMY 23
1/5   43/33/38/+10/0.23/0.0/000/00        34 ENE  VEC1 N/A    RMY 37
1/6   35/31/33/+5/0.18/1.0/000/00         19 NNE  VEC1 N/A    RMY 19
1/7   40/30/35/+8/0.00/0.0/105/19         22 NW   VEC1 N/A    RMY 23
1/8   36/20/28/+1/0.00/0.0/517/93         26 NNW  VEC1 N/A    RMY 28
1/9   42/26/34/+7/T/0.1/267/48            27 NW   VEC1 N/A    RMY 27
1/10  41/25/33/6/0.00/0.0/318/57          28 NW   VEC1 N/A    RMY 28
1/11  33/18/26/-1/T/0.1/358/64            19 N    VEC1 N/A    RMY 18
1/12  48/28/38/+11/0.29/0.1/000/00        45 S    VEC1 N/A    RMY 46
1/13  55/36/46/+20/0.62/0.0/000/00        54 SSW  VEC1 N/A    RMY 56
1/14  36/29/33/+7/0.11/T/000/00           30 NNE  VEC1 N/A    RMY M
1/15  33/26/30/+4/0.10/1.2/000/00         45 NNE  VEC1 N/A    RMY 45
1/16  30/26/28/+2/0.22/2.7/000/00         36 NNE  VEC1 N/A    RMY 37
1/17  47/25/36/+10/…/…/…/..         22 WSW  VEC1 N/A    RMY 23
1/18  49/35/42/+16/0.03/0.0/…/..        37 NW   VEC1 N/A    RMY 38
1/19  38/32/35/…./T/000/00              31 NNE  VEC1 N/A    RMY 32

1/20 The low since midnight is 31F, the daily normal low is 18F

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

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978
PEAK GUST 76e MPH NE IN 1978

RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979

TODAY’S REPORT PREPARED BY: Kaitlin Geagan