Thursday, January 23, 2020

| January 23, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 23, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

INCREASING CLOUDS AND A SOUTHWESTERLY BREEZE
WITH A TEMPERATURE INCREASE….

Almost clear skies this morning were overcast
by the 1 P.M. observation. Visibility was limited
due to a distant haze this morning, increasing from
30 miles to 65 miles during its dissipation.
Impressively, the observatory still has two inches
of snow depth from the event that happened 4 days
ago; despite abundant sunshine in the five days prior.

A consistent southwesterly wind signals the approach
of a warm air mass, boosting temperatures above
seasonal averages. The high so far today is 43F,
9 degrees above the normal high of 34F. The low
since midnight is 24F, this is 7 degrees above the
normal low of 17F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus
Temperature: 28F; Dew Point: 15F; Wind: SSW at 13 kts
Sea-level pressure: 30.38 ins. Hg, rising, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 30F
6-hr Min temp: 24F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow depth: 2 ins.
BHO SA 1155 250 SCT 30 287/28/15/2113/038/ HAZY/ 8/008 4/002
53011 10030 20024

10 A.M.
Weather: Broken cirrus
Temperature: 34F; Dew Point: 17F; Wind: SW at 10 kts
Sea-level pressure: 30.39 ins. Hg, rising, then more slowly
Visibility: 35 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E250 BKN 35 291/34/17/2010/039/ HAZY/ 8/002 53004

1 P.M.
Weather: Overcast cirrostratus
Temperature: 43F; Dew Point: 9F; Wind: WSW at 7 kts,
Sea-level pressure: 30.33 ins. Hg, falling, then more slowly
Visibility: 65 miles
6-hr Max temp: 43F
6-hr Min temp: 26F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow depth: 2 ins
BHO SA 1755 E250 OVC 65 273/43/9/2507/033/ 8/008 4/002 58018
10043 20026

SUMMARY FOR WEDNESDAY, JANUARY 22, 2020

TEMPERATURE (DEGREES F)
MAX…..34   NORMAL…..34
MIN…..13   NORMAL…..17
MEAN….24   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL………………… -1
TOTAL DEPARTURE FOR THE MONTH………………..+157 [+6.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………41  DEPARTURE……. +1
TOTAL HEATING UNITS FOR THE MONTH…………..714  DEPARTURE……-155
TOTAL HEATING UNITS FOR THE SEASON…………2965  DEPARTURE……-208
TOTAL HEATING UNITS LAST SEASON TO DATE…….3154  DEPARTURE……-189

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..16 SW  AT  11:35 P.M.
AERO…………………….16 SW  AT  11:35 P.M.
ASOS…………………….16 S   AT  10:19 P.M.
DAVIS……………………16 SSW AT  10:21 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….14 WNW AT  11:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 SW  AT  11:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 SW  AT  11:38 P.M.
AVERAGE WIND SPEED AND DIRECTION……………6.8 WNW
ASOS……………………6.8
DAVIS…………………..7.2 WNW [259 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.89  DEPARTURE……-2.23
ASOS…………..0.92
TOTAL PRECIPITATION FOR THE YEAR………..0.89  DEPARTURE……-2.23
ASOS…………..0.92

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……… 0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH…………… 4.2  DEPARTURE…….-8.1
TOTAL SNOWFALL FOR THE SEASON…………..24.2  DEPARTURE…….-4.1

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

01/01  38/30/34/+7/…./0.0/…./..           39 W   AERO 38 W   RMY 41
01/02  46/29/38/+11/0.00/0.0/…./..          28 SW  AERO 28 SW  RMY 30
01/03  46/40/43/+17/0.00/0.0/…./..          21 SW  AERO 18 SW  RMY N/A
01/04  46/36/41/+15/…./0.0/…./..          16 NNW AERO 16 NNW RMY N/A
01/05  36/24/30/+4/…./0.5/…./..           43 NW  AERO 46 NW  RMY 43
01/06  33/23/28/+2/T/T/…./..                26 W   AERO 21 W   RMY N/A
01/07  38/29/34/+8/…./0.4/…/..            30 WSW AERO 28 WSW RMY N/A
01/08  39/22/31/+5/…./0.4/…/..            50 W   AERO 46 WNW RMY 47
01/09  28/16/22/-4/…./0.0/…/..            43 WNW AERO 40 WNW RMY N/A
01/10  48/23/36/11/T/…./0.0/…/..          37 SW  AERO 37 SW  RMY 39
01/11  65/46/56/+31/…./0.0/…/..           53 SSW AERO 53 SSW RMY N/A
01/12  68/36/52/+27/…./0.0/…/..           60 SSW AERO 62 SSW RMY N/A
01/13  39/31/35/+10/0.01/T/…/..             21 NE  AERO 20 NE  RMY N/A
01/14  38/31/35/+10/0.01/0.0/…/..           16 W   AERO 15 W   RMY N/A
01/15  48/35/42/+17/0.00/0.0/…/..           24 W   AERO 23 W   RMY 24
01/16  42/24/33/+8/0.06/T/…/..              54 W   AERO 52 W   RMY 59
01/17  24/10/17/-8/0.00/0.0/…./..           50 NW  AERO 48 NW  RMY N/A
01/18  28/8/18/-7/0.35/2.8/…./..            28 WSW AERO 24 ESE RMY N/A
01/19  40/21/31/+6/0.02/0.2/…./..           44 W   AERO 44 W   RMY 42
01/20  26/12/19/-6/0.00/0.0/…./..           33 NW  AERO 32 NW  RMY N/A
01/21  24/10/17/-8/0.00/0.0/…./..           22 NW  AERO 21 NW  RMY N/A
01/22  34/13/24/-1/0.00/0.0/…./..           16 SW  AERO 16 SW  RMY N/A

01/23 The low since midnight is 24F, daily normal minimum is 17F

DAILY RECORDS FOR JANUARY

1/11/20: DAILY RECORD MAXIMUM TEMPERATURE OF 65F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1975.

1/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 46F,
BREAKS PREVIOUS RECORD OF 40F SET IN 1983.

1/12/20: DAILY RECORD MAXIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 60 SET IN 2018.
TIES HIGHEST MAXIMUM FOR JANUARY,
ADDITIONAL 68F ON 1/26/1950.

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

RECORDS FOR JANUARY 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 2.40 INS. IN 1935
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992

RECORDS FOR JANUARY 24
HIGH 60F IN 1967
LOW -12F IN 1907
PRECIP 2.04 INS. IN 1998
SNOWFALL 11.3 INS. IN 1935
PEAK GUST 82 MPH S IN 1996

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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