Friday, March 27, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MARCH 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A MOSTLY CLOUDY START TURNS INTO A BRIGHT, BEAUTIFUL
SPRING DAY…

A mid-altitude cloud deck comprised of altocumulus blanketed
most of the early morning sky. This quickly moved offshore
yielding much clearer skies by mid-morning. With full sunshine
and a dry westerly wind, afternoon temperatures have risen to
the low-60s with a relative humidity of only 22%. In addition,
visibility has been excellent with a perfect 90 miles noted by
1PM. All in all, a gorgeous spring day here!

The low so far today is 40F, which is 10 degrees above the
normal low of 30F. The high so far today is 60F, which is
12 degrees above the normal max of 48F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus
Temperature: 46F; Dew Point: 39F; Relative Humidity: 76%
Wind: W at 12 kts
Sea-level pressure: 29.72 ins. Hg: falling, then rising
Visibility: 80 miles
6-hr Max temp: 46F
6-hr Min temp: 42F
24-hr Precip:  Trace
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E950 BKN 80 064/46/39/2812/972/ FEW CC NW-NE/
8/079/ 53008 10046 20042

10 A.M.
Weather: Scattered Altocumulus; Thin Scattered Cirrus
Temperature: 55F; Dew Point: 26F; Relative Humidity: 32%
Wind: NW at 15G26 kts
Peak Wind: 29 kts (33 MPH) NW @ 8:33 A.M.
Sea-level pressure: 29.77 ins. Hg: rising, then rising more slowly
Visibility: 85 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 130 SCT 250 -SCT 85 080/55/26/3215G26/977/
AC BAND DSNT ESE-SSW PK WND 3229/1334/ 8/074 51016

1 P.M.
Weather: Clear; Few Altocumulus SE-SW
Temperature: 60F; Dew Point: 22F; Relative Humidity: 22%
Wind: NW at 14G22 kts
Sea-level pressure: 29.79 ins. Hg: rising, then rising more slowly
Visibility: 90 miles
6-hr Max temp: 60F
6-hr Min temp: 46F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 CLR 90 089/60/22/3214G22/979/ FEW AC DSNT SE-SW/
8/070 51009 10060 200462

SUMMARY FOR THURSDAY, MARCH 26, 2020

TEMPERATURE (DEGREES F)
MAX…..51   NORMAL…..48
MIN…..30   NORMAL…..30
MEAN….41   NORMAL…..39

DEPARTURE FROM 30-YEAR NORMAL………………..+2
TOTAL DEPARTURE FOR THE MONTH………………+172 [+6.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………24  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………..617  DEPARTURE……-172
TOTAL HEATING UNITS FOR THE SEASON…………4757  DEPARTURE……-600
TOTAL HEATING UNITS LAST SEASON TO DATE…….5303  DEPARTURE……-546

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 SSE AT  6:51 P.M.
AERO…………………….26 SSW AT 11:59 P.M.
ASOS…………………….24 SSW AT 11:59 P.M.
DAVIS……………………26   S AT  8:57 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….18 SSW AT 11:37 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 SSW AT 11:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 S   AT  8:20 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.1 N
ASOS…………………..10.5
DAVIS………………….10.2 NE [49 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE DEPARTURE……-0.19
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.49  DEPARTURE……-1.19
ASOS…………..3.63
TOTAL PRECIPITATION FOR THE YEAR………..8.15  DEPARTURE……-4.95
ASOS…………..8.54

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.3
TOTAL SNOWFALL FOR THE MONTH…………….2.8  DEPARTURE…….-8.5
TOTAL SNOWFALL FOR THE SEASON…………..27.6  DEPARTURE……-30.7

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  40/25/33/-5/…./1.6/…/..         38 NNE AERO 39 NNE RMY 38
03/24  48/33/41/+3/…./…/…/..         37 NNW AERO 37 NNW RMY N/A
03/25  41/35/38/0/0.03/0.0/…/..          28 ENE AERO 28 ENE RMY 27
03/26  51/30/41/+2/…/0.0/…/..          25 SSE AERO 26 SSW RMY N/A

03/27 The low since midnight is 40F, daily normal minimum is 30F

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

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

RECORDS FOR MARCH 28
HIGH 86 IN 1998
LOW 7 IN 1923
PRECIP 2.31 INS. IN 1932
SNOWFALL 3.0 INS. IN 1932
PEAK GUST 60e MPH NW IN 1944, 60 WSW IN 1991

TODAY’S REPORT PREPARED BY: Andrew Swanson