Friday, March 26, 2021

| March 27, 2021 | Reply

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

FRIDAY, MARCH 26, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0537E
SUNSET:  1804E

DENSE FOG RETURNS AND HANGS AROUND….

A low ceiling at around 400 feet created very dense fog atop
the hill this morning. Visibility was just 1/16th of a mile
at 7 AM. Not much rainfall was squeezed out of this saturated
air – only 0.01 inches was left overnight in the gauge. 

As the morning progressed, we saw visibility improve for a time
to 2 miles. However, most of the observing day has been around 1/8th
of a mile with the summit shrouded in low clouds. 

Winds have been picking up out of the south gusting to 38 MPH
so far. A Wind Advisory is up for our region from 3 PM today to
4 AM tomorrow.

The drought monitor was updated yesterday. Our spring
precipitation deficit has left us and much of MA in abnormally
dry conditions. While this is not much cause for alarm, it
does mean elevated fire risk on windy, dry days. Computer
models are indicating, however, a chance of a good soaking rain
on Sunday. While not ideal to have this over the weekend of course,
it will make a beneficial impact on vegetation and reservoirs, and
will calm the fire danger.

The high so far today is 58F, which is 10 degrees above the
normal high of 48F. The low since midnight is 50F, which
is 20 degrees above the daily normal low of 30F.


Today’s Observations:

7 A.M.
Weather: Fog (sky obscured, vertical visibility 100 ft)
Temperature: 54F; Dew Point: 54F; Relative Humidity: 100%
Wind: S @ 13G25 kts
Sea-level pressure: 29.80 in Hg; falling unsteadily
Visibility: 1/16 mile, fog
6-hr Max temp: 54F
6-hr Min temp: 50F
24-hr Precip: 0.01 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W1 1/16F 091/54/54/1913G25/980/ 8//// 57029 70001
10054 20050

10 A.M.
Weather: Fog (sky obscured, vertical visibility 200 ft)
Temperature: 57F; Dew Point: 57F; Relative Humidity: 100%
Wind: S @ 16G25 kts
Peak Wind: 31 MPH (27 knots), South @ 9:03 A.M.
Sea-level pressure: 29.71 in Hg; falling, then falling more rapidly
Visibility: 1/8 mile, fog
3-hr Precip: 0.00 ins
3-hr Snow: 0.0 ins.
BHO SA 1455 X W2 1/8F 062/57/57/1916G25/971/ PK WND 1927/03/ 8//// 58029

1 P.M.
Weather: Fog (sky obscured, vertical visibility 200 ft)
Temperature: 58F, Dew point: 58F; Relative Humidity: 100%
Wind: S @ 19G29 its
Peak Wind: 38 MPH (33 knots), South @ 10:38 A.M.
Sea-level pressure: 29.59 in Hg; falling, then falling more rapidly
(PRESFR = Pressure falling rapidly)
Visibility: 1/8 miles, fog
6-hr Max temp: 58F
6-hr Min temp: 54F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 X W2 1/8F 021/58/58/1919G29/959/ PK WND 1933/1538 PRESFR/ 8//// 58041 10058 20054


SUMMARY FOR THURSDAY, MARCH 25, 2021

TEMPERATURE (DEGREES F)
MAX…….67     NORMAL…..47
MIN…….49     NORMAL…..30
MEAN……58     NORMAL…..38

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +20
TOTAL DEPARTURE FOR THE MONTH………………. +78 [+2.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….7  DEPARTURE……-20
TOTAL HEATING UNITS FOR THE MONTH…………..685  DEPARTURE……-78
TOTAL HEATING UNITS FOR THE SEASON…………4730  DEPARTURE…..-601
TOTAL HEATING UNITS LAST SEASON TO DATE…….4733  DEPARTURE…….-3

PEAK WIND GUST (MPH):
                     420C/Official…………..25 S   @ 11:42 P.M.
                     AEROVANE (south tower)…..26 S   @ 11:43 P.M.
                     ASOS…………………..25 S   @ 11:44 P.M.
                     DAVIS #1……………….26 S   @ 12:13 A.M.
                     DAVIS #2 (south tower)…..27 SSE @  1:27 A.M.
                     RMY……………………26     @ 11:42 P.M.
                     VECTOR…………………25 S   @ 11:23 P.M.
                     MERLIN…………………M

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 S   @ 11:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 S   @ 11:45 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 SSE @ 12:20 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 S   @ 11:45 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..20 SSW @ 11:42 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..19     @ 11:42 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…….9.5 S [227 total miles]
                     ASOS………………….9.6  
                     DAVIS #1………………9.4 S  
                     DAVIS #2……………..10.2 S
                     RMY…………………..9.7 S
                     VECTOR……………….10.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.01  DEPARTURE….-0.18
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.06  DEPARTURE….-3.42
                             ASOS………….1.09
TOTAL PRECIPITATION FOR THE YEAR…………..9.06  DEPARTURE….-3.84
                              ASOS…………9.35

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………. 0.0  DEPARTURE…. -0.3
TOTAL SNOWFALL FOR THE MONTH……………… 0.2  DEPARTURE….-10.8
TOTAL SNOWFALL FOR THE SEASON……………..72.6  DEPARTURE….+15.1


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   42/24/33/+2/0.13/T/020/03        69 WNW  AERO 78 WNW  RMY 78
03/02   27/10/19/-12/T/0.1/679/100       63 WNW  AERO 71 WNW  RMY 69
03/03   45/19/32/0/0.00/0.0/375/55       30 W    AERO 30 W    RMY 34
03/04   38/22/30/-2/0.00/0.0/520/76      46 NW   AERO 51 NW   RMY 53
03/05   31/18/25/-7/0.00/0.0/549/80      39 WNW  AERO 44 NW   RMY 45
03/06   33/15/24/-8/0.00/0.0/675/98      28 WNW  AERO 29 WNW  RMY 30
03/07   35/15/25/-8/0.00/0.0/686/99      21 NW   AERO 22 NW   RMY 23
03/08   38/19/29/-4/T/T/389/56           20 NW   AERO 20 NW   RMY 21
03/09   56/30/43/+10/T/T/…/..          32 WNW  AERO 35 WNW  RMY 37
03/10   54/32/43/+10/0.00/0.0/…/..     29 SSW  AERO 29 SSW  RMY 31
03/11   71/35/53/+19/0.00/0.0/…/..     41 SSW  AERO 43 SSW  RMY 46
03/12   62/42/52/+18/0.00/0.0/…/..     52 WNW  AERO 59 WNW  RMY 57
03/13   46/27/37/+3/0.00/0.0/…/..      53 WNW  AERO 59 WNW  RMY 57
03/14   45/19/32/-3/0.01/0.1/…/..      51 WNW  AERO 58 NW   RMY 58
03/15   27/12/20/-15/0.00/0.0/…/..     48 NW   AERO 47 NW   RMY 54
03/16   37/13/25/-10/0.00/0.0/…/..     22 NNW  AERO 22 NNW  RMY 23
03/17   52/27/40/+4/0.00/0.0/…/..      28 S    AERO 25 S    RMY 29
03/18   46/34/40/+4/0.80/T/…/..        38 NE   AERO 40 NE   RMY 42
03/19   39/26/33/-3/T/T/…/..           37 N    AERO 38 N    RMY 41
03/20   58/24/41/+4/0.00/0.0/…/..      23 W    AERO 23 W    RMY 27
03/21   62/39/51/+14/0.00/0.0/…/..     22 S    AERO 23 S    RMY 25
03/22   62/36/49/+12/0.00/0.0/…/..     21 S    AERO 18 S    RMY 22
03/23   65/38/52/+14/0.00/0.0/…/..     22 ESE  AERO 18 SE   RMY 21
03/24   63/44/54/+16/…./0.0/…/..     22 SSE  AERO 21 SSE  RMY 21
03/25   67/49/58/+20/0.11/0.0/…/..     25 S    AERO 26 S    RMY 26

03/26 The low since midnight is 50F, the daily normal low is 30F


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

RECORDS FOR MARCH 26
HIGH 76 IN 1922, 1949
LOW 6 IN 1960
PRECIP 1.99 INS. IN 1988
SNOWFALL 5.4 INS. IN 2001
PEAK GUST 63 MPH S IN 1970

RECORDS FOR MARCH 27
HIGH 78 IN 1998
LOW 12 IN 1975
PRECIP 1.05 INS. IN 1913
SNOWFALL 6.6 INS. IN 1959
PEAK GUST 62 MPH NW IN 1965, SE IN 1992


TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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