Tuesday, January 31, 2023

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

TUESDAY, JANUARY 31, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0659E
SUNSET:  1657E

CLOUDS AND LIGHT SNOW THIS MORNING, GIVING WAY TO PARTIAL SUNSHINE
THIS AFTERNOON…

A period of light snow occurred this morning bringing a total of
0.8″ of accumulation. With the ground warm and temperatures just
under freezing here on the summit, we only had a 1 inch snow
depth briefly between 8-10am. Otherwise, it was a trace at the
time of both the 7am and 1pm observations.

Clouds are breaking this afternoon allowing for some partial
sunshine, however cold air advection is taking place at the
same time. As such temperatures are holding in the lower 30s.
The dew point is dropping fairly markedly early this afternoon,
from around 30 this morning, to the low 20s early this afternoon.

The wind is also increasing this afternoon thanks to the cold air
advection. After being quite light all morning, gusts over 20mph
are now occurring. The average speed for the day so far is around
7mph, but increasing.

Visibility is improving as well as the drier air moves into the
region. After being only around 1/4 mile early this morning in
snow and fog, it is now up to an excellent 70 miles early this
afternoon.

The high so far today is 39F degrees, which occurred back at
midnight. This is 4 degrees above the normal maximum of 35F.
The low since midnight is 29F degrees, which is 12 degrees above
the normal minimum of 17F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light snow
Temperature: 30F; Dew Point: 30F; Relative Humidity: 100%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1020.9 mb; 30.15 in. Hg: rising, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 37F
6-hr Min temp: 30F
24-hr Precip:  0.08 ins.
24-hr Snowfall: 0.4 ins.
Snow Depth: Trace
BHO SA 1155 X W2 1/4S-F 209/30/30/3405/015/ WND LGT NEW SNW PST
24 HRS 0.4 INS/ 8//// 4/000 53021 6008/ 70008 10037 20030

10 A.M.
Weather: Scattered stratus fractus, overcast nimbostratus,
few breaks in overcast distant W-NW-NE, very light snow
Temperature: 32F; Dew Point: 30F; Relative Humidity: 91%
Wind: NNW @ 4 kts, wind light
Sea-level pressure: 1022.6 mb; 30.20 in. Hg: rising, then more rapidly
Visibility: 40 miles
3-hr Precip:  0.03 ins.
3-hr Snowfall: 0.4 ins.
BHO SA 1455 10 SCT E65 OVC 40S- 226/32/30/3304/020/ FEW BINOVC
DSNT W-NW-NE PCPN VRY LGT S-E08B54 WND LGT NEW SNW PST 3 HRS
0.4 INS/ 8/72/ 53017 6003/

1 P.M.
Weather: Broken stratocumulus
Temperature: 33F; Dew Point: 23F; Relative Humidity: 67%
Wind: NNW @ 13G20 kts
Sea-level pressure: 1021.7 mb; 30.17 in. Hg: rising, then falling
Visibility: 70 miles
6-hr Max temp: 34F
6-hr Min temp: 29F
6-hr Precip:  0.03 ins.
6-hr Snowfall: 0.4 ins.
Snow Depth: Trace
BHO SA 1755 E40 BKN 70 217/33/23/3313G20/017/ NEW SNW PST 6 HRS
0.4 INS/ 8/500 4/000 58009 6003/ 10034 20029

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SUMMARY FOR MONDAY, JANUARY 30, 2023

TEMPERATURE (DEGREES F)
MAX…….50   NORMAL…..35
MIN…….36   NORMAL…..17
MEAN……43   NORMAL…..26

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+17
TOTAL DEPARTURE FOR THE MONTH……………….+273 [+8.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………22  DEPARTURE…….-17
TOTAL HEATING UNITS FOR THE MONTH…………..878  DEPARTURE……-276
TOTAL HEATING UNITS FOR THE SEASON…………2788  DEPARTURE……-576
TOTAL HEATING UNITS LAST SEASON TO DATE…….3095  DEPARTURE……-307

PEAK WIND GUST (MPH):
420C (Official)…………18 SW  @  9:41 P.M.
VECTOR #2 (1-Sec)……….20     @  9:41 P.M.
DAVIS #1……………….20 SW  @  9:49 P.M.
DAVIS #2 ………………19 SW  @  9:41 P.M.
RMY #2 (Instantaneous)…..20 SW  @  9:40 P.M.
MERLIN…………………19 SSW
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 SSW @  9:29 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16     @  9:41 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 W   @ 12:06 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 SSW @  9:41 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 SW  @  9:41 P.M.
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…….8.2 W [197 total miles] VECTOR #2……………..9.0
DAVIS #1………………8.5 WSW
DAVIS #2………………9.0 W
RMY #2………………..9.1 W
RMY #1……….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1…….OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.08 DEPARTURE…..-0.05
TOTAL PRECIPITATION FOR THE MONTH…………..6.76 DEPARTURE…..+2.40
TOTAL PRECIPITATION FOR THE YEAR……………6.76 DEPARTURE…..+2.40

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.4 DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH……………….11.8 DEPARTURE……-6.1
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……14.5 DEPARTURE…..-18.5

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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/+10/0.02/0.0/415/73        22 WSW  VEC1 N/A    RMY 23
1/18  49/35/42/+16/0.01/0.0/314/55        37 NW   VEC1 N/A    RMY 38
1/19  38/32/35/+9/0.75/T/000/00           31 NNE  VEC1 N/A    RMY 32
1/20  35/29/32/+6/0.56/1.6/000/00         52 NE   VEC1 N/A    RMY 54
1/21  31/25/28/+2/0.01/0.2/000/00         21 NW   VEC1 N/A    RMY 21
1/22  35/25/30/+4/0.25/0.2/000/00         21 N    VEC1 N/A    RMY 20
1/23  34/27/31/+5/1.18/4.1/000/00         36 NNW  VEC1 N/A    RMY 37
1/24  35/25/20/+4/0.00/0.0/157/27         32 WNW  VEC1 N/A    RMY 32
1/25  42/27/35/+9/0.45/0.1/012/02         40 SSE  VEC1 N/A    RMY 42
1/26  53/33/43/+17/0.85/T/029/05          52 S    VEC1 N/A    RMY 54
1/27  41/25/33/+7/0.00/0.0/577/98         31 WNW  VEC1 N/A    RMY 29
1/28  48/29/39/+13/0.00/0.0/390/66        38 W    VEC1 N/A    RMY 40
1/29  49/36/43/+17/T/0.0/101/17           33 S    VEC1 N/A    RMY 38
1/30  50/36/43/+17/0.00/0.0/…/..        18 SW   VEC1 N/A    RMY 20

1/31 The low since midnight is 29F, the daily normal low is 17F

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

RECORDS FOR JANUARY 31
HIGH 58F IN 1947, 2013
LOW -12F IN 1920
PRECIP 1.03 INS. IN 1914
SNOWFALL 9.0 INS. IN 1898
PEAK GUST 75 MPH NW IN 1974

RECORDS FOR FEBRUARY 1
HIGH 65F IN 1989
LOW -9F IN 1920
PRECIP 1.86 INS. IN 2021
SNOWFALL 12.7 INS. IN 2021
PEAK GUST 66e MPH SSW IN 1951

TODAY’S REPORT PREPARED BY: Matt Douglas