Monday, March 23, 2020

| March 23, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MARCH 23, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

INCREASING CLOUDS THIS MORNING, LEADS TO SNOW DEVELOPING
THIS AFTERNOON….

After a cold, but dry weekend, a storm system approaching
the region to our south has lead to increasing cloud cover
this morning, and now to the development of snow, which
began falling just after our 1pm observation.

As would be expected with snowfall moving into the area,
visibility has decreased significantly as the day has
progressed. We started the day with 60 miles, down to a
prevailing visibility of 30 miles at 1pm, but only 10 miles
to the southwest and 15 miles to the west as the snow moved
in. As of 2pm EST, visibility was down to 1 mile in light
to moderate snow.

Any precipitation is welcomed at this point as we’ve been
running quite the deficit since the start of the year. Total
liquid precipitation for the year through 7am this morning
was only 5.75 inches. This is -6.59 inches below normal to
date. We will be adding to our snowfall totals for the
2019-2020 “winter” season and will have those stats for you
tomorrow.

The overnight low was 25F, this is 4 degrees below the
normal low of 29F. The high so far today is 38F, 8 degrees
below the normal max of 46F.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, scattered altostratus,
overcast cirrostratus
Temperature: 29F; Dew Point: 21F; Relative Humidity: 72%
Wind: SE at 8 kts
Sea-level pressure: 30.64 ins. Hg: rising then falling
Visibility: 60 miles
6-hr Max temp: 29F
6-hr Min temp: 25F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 35 SCT 100 SCT E190 OVC 60 375/29/21/1208/064/
FEW BINOVC E THN SPTS INOVC ALQDS VIRGA S-W SUN DMLY VSBL/
8/516 58019 10029 20025

10 A.M.
Weather: Broken stratocumulus, overcast altostratus
Temperature: 34F; Dew Point: 22F; Relative Humidity: 61%
Wind: SE at 12G17 kts
Sea-level pressure: 30.58 ins. Hg: falling, then more rapidly
Visibility: 30 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E30 BKN 70 OVC 30 354/34/22/1212G17/058/ 8/52/ 57021

1 P.M.
Weather: Broken stratocumulus, overcast nimbostratus
Temperature: 36F; Dew Point: 25F; Relative Humidity: 63%
Wind: SE at 10G18 kts
Sea-level pressure: 30.46 ins. Hg: falling rapidly
Visibility: 30 miles, 10 miles SW, 15 miles W
6-hr Max temp: 38F
6-hr Min temp: 29F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E25 BKN 50 OVC 30 315/36/25/1310G18/046/ VSBY SW 10
W 15 PRESFR/ 8/6// 53039 10038 20029

SUMMARY FOR SUNDAY, MARCH 22, 2020

TEMPERATURE (DEGREES F)
MAX…..36   NORMAL…..46
MIN…..23   NORMAL…..28
MEAN….30   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL………………. -7
TOTAL DEPARTURE FOR THE MONTH………………+172 [+7.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE……. +7
TOTAL HEATING UNITS FOR THE MONTH…………..510  DEPARTURE……-172
TOTAL HEATING UNITS FOR THE SEASON…………4650  DEPARTURE……-600
TOTAL HEATING UNITS LAST SEASON TO DATE…….5199  DEPARTURE……-549

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 NE  AT  7:53 A.M.
AERO…………………….24 NE  AT  8:04 A.M.
ASOS…………………….24 NE  AT  8:04 A.M.
DAVIS……………………24 NE  AT  8:04 A.M. RMY 23
FASTEST MILE FOR YESTERDAY………………….17 N   AT 12:54 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 ENE AT 10:02 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 ENE AT 10:01 A.M.
AVERAGE WIND SPEED AND DIRECTION………….. 9.3 ENE
ASOS………………….. 9.2
DAVIS…………………. 9.9 ENE  [066 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.20
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.09  DEPARTURE……-2.83
ASOS…………..1.25
TOTAL PRECIPITATION FOR THE YEAR………..5.75  DEPARTURE……-6.59
ASOS…………..6.16

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.4
TOTAL SNOWFALL FOR THE MONTH…………….1.2  DEPARTURE…….-8.9
TOTAL SNOWFALL FOR THE SEASON…………..26.0  DEPARTURE……-31.1

PRELIMINARY CLIMATE SUMMARY FOR MARCH 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

03/01  33/15/24/-7/0.00/0.0/…/..         28 WNW AERO 28 WNW RMY 27
03/02  52/24/38/+7/T/T/…/..              40 S   AERO 39 S   RMY 41
03/03  64/45/55/+23/…./0.0/…/..        30 S   AERO 30 S   RMY N/A
03/04  50/38/44/+12/…./0.0/…/..        56 W   AERO 56 W   RMY 58
03/05  51/32/42/+10/0.00/0.0/…/..        31 W   AERO 31 NW  RMY 32
03/06  47/30/39/+7/…./…/…/..         46 NE  AERO 45 NE  RMY 46
03/07  43/26/35/+2/…./…/…/..         42 N   AERO 43 N   RMY 44
03/08  53/26/40/+7/0.00/0.0/…/..         31 W   AERO 30 W   RMY 28
03/09  72/40/56/+23/0.00/0.0/…/..        32 SW  AERO 32 SW  RMY 31
03/10  68/49/59/+26/0.00/0.0/…/..        48 WSW AERO 46 WSW RMY 49
03/11  56/37/47/+13/0.00/0.0/…/..        31 WNW AERO M  M   RMY 21
03/12  46/31/39/+5/…./0.0/…/..         21 SE  AERO 18 SE  RMY N/A
03/13  59/38/49/+15/…./0.0/…/..        46 WNW AERO 44 WNW RMY 46
03/14  51/35/43/+8/0.00/0.0/…/..         37 W   AERO 36 W   RMY 35
03/15  47/28/38/+3/0.00/0.0/…/..         28 NW  AERO 28 NW  RMY N/A
03/16  36/22/29/-6/0.00/0.0/…/..         21 NE  AERO 21 ESE RMY 21
03/17  43/28/36/0/…./0.4/…/..          29 W   AERO 30 W   RMY 29
03/18  54/31/43/+7/…./0.0/…/..         26 S   AERO 26 S   RMY 26
03/19  43/37/40/+4/…./0.0/…/..         36 E   AERO 35 E   RMY 34
03/20  66/37/52/+15/…./0.0/…/..        48 W   AERO 48 W   RMY 46
03/21  55/29/42/+5/0.00/0.0/…/..         45 W   AERO 48 W   RMY N/A
03/22  36/23/30/-7/0.00/0.0/…/..         23 NE  AERO 24 NE  RMY 23

03/23 The low since midnight is 25F, daily normal minimum is 29F

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

RECORDS FOR MARCH 23
HIGH 78 IN 1938
LOW 3 IN 1934
PRE 2.52 INS. IN 2010
SNOW 3.0 INS. IN 1977
WIND 78e MPH W IN 1940

RECORDS FOR MARCH 24
HIGH 70 IN 1920
LOW 6 IN 1906
PRECIP 1.51 INS. IN 1956
SNOWFALL 12.3 INS. IN 1956
PEAK GUST 71 MPH W IN 1968

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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