Wednesday, April 14, 2021

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

WEDNESDAY, APRIL 14, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0504E
SUNSET:  1825E

DECENT AMOUNT OF SUNSHINE, BUT ONSHORE WIND KEEPING
TEMPERATURES ON THE COOL SIDE…

Not a bad day today overall with plenty of sunshine and
generally a light, but steady wind, however the persistent
onshore flow is helping to keep temperatures on the cool
side once again.

A few very light rain showers moved through during the
wee hours of the morning, but didn’t amount to anything
measurable.

Visibility has been limited today, likely due to
increasing pollen in the air. We’ve only been able to
see about 35-40 miles at best.

The high so far today is 55F, this is equal to the normal
high of 55F. The low since midnight is 42F, which is 5
degrees above the daily normal low of 37F.


Today’s Observations:

7 A.M.
Weather: Broken Altocumulus Castellanus, thin broken Cirrus
Temperature: 47F; Dew Point: 36F; Relative Humidity: 65%
Wind: ESE at 7 kts
Sea-level pressure: 30.10 in Hg, rising, then more slowly  
Visibility: 25 miles, hazy
6-hr Max temp: 47F
6-hr Min temp: 42F
24-hr Precip: Trace
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E70 BKN 250 -BKN 25 192/47/36/1107/010/
FEW SC N-E-SE HAZY/ 8/581 51009 6000/ 70000 10047 20042

10 A.M.
Weather: Scattered Stratocumulus, scattered Altocumulus/Castellanus
Temperature: 52F; Dew Point: 36F; Relative Humidity: 53%
Wind: E @ 6 kts
Sea-level pressure: 30.08 in Hg; rising, then falling
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 35 SCT 70 SCT 35 187/52/36/1006/008/ HAZY/
8/580 58005

1 P.M.
Weather: Clear, few stratocumulus distant S-W-NW,
few altocumulus castellanus distant W-NW, few cirrus distant SW-W
Temperature: 54F, Dew point: 38F; Relative Humidity: 54%
Wind: E @ 9 kts
Sea-level pressure: 30.03 in Hg; falling, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 55F
6-hr Min temp: 47F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 35 170/54/38/0909/003/ FEW SC DSNT S-W-NW
FEW ACC DSNT W-NW AND DSNT N FEW CI DSNT SW-W HAZY/
8/581 56017 10055 20047


SUMMARY FOR TUESDAY, APRIL 13, 2021

TEMPERATURE (DEGREES F)
MAX…….56     NORMAL…..55
MIN…….37     NORMAL…..37
MEAN……47     NORMAL…..46

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +1
TOTAL DEPARTURE FOR THE MONTH……………….+43 [+3.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………18  DEPARTURE…… -1
TOTAL HEATING UNITS FOR THE MONTH…………..238  DEPARTURE……-43
TOTAL HEATING UNITS FOR THE SEASON…………5060  DEPARTURE…..-705
TOTAL HEATING UNITS LAST SEASON TO DATE…….5138  DEPARTURE……-78

PEAK WIND GUST (MPH):
                     420C/Official…………..31 NE  @  9:03 A.M.
                     AEROVANE (south tower)…..30 NE  @  9:03 A.M.
                     ASOS…………………..31 NE  @  9:03 A.M.
                     DAVIS #1……………….31 NE  @  9:02 A.M.
                     DAVIS #2 (south tower)…..31 NE  @  8:50 A.M.
                     RMY……………………33     @  9:02 A.M.
                     VECTOR…………………34     @  7:52 A.M.
                     MERLIN…………………31

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NE  @  9:05 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 NE  @  8:17 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 NE  @  9:04 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 NE  @  9:03 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..20 ENE @  8:56 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..20     @  9:01 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…….10.0 NE [239 total miles]                     ASOS…………………. 9.9  
                     DAVIS #1………………10.4 NE  
                     DAVIS #2………………10.5 NE
                     RMY………………….. 9.8 ENE
                     VECTOR………………..10.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE  DEPARTURE….-0.16
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.94  DEPARTURE….-1.24
                             ASOS………….0.92
TOTAL PRECIPITATION FOR THE YEAR………….11.11  DEPARTURE….-5.06
                              ASOS………..11.43

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…. -0.1
TOTAL SNOWFALL FOR THE MONTH …………….TRACE  DEPARTURE…..-2.0
TOTAL SNOWFALL FOR THE SEASON……………..72.6  DEPARTURE….+11.4


PRELIMINARY CLIMATE SUMMARY FOR APRIL 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

04/01   56/30/43/+2/0.89/T/…/..        44 NW   AERO 51 NW   RMY 49
04/02   37/24/31/-10/0.00/0.0/…/..     28 NW   AERO 32 NNW  RMY 30
04/03   48/23/36/-6/0.00/0.0/…/..      24 NW   AERO 25 NW   RMY 26
04/04   58/33/46/+4/0.00/0.0/…/..      38 NNW  AERO 41 NNW  RMY 41
04/05   57/41/49/+6/T/T/…/..           41 NNW  AERO 48 NNW  RMY 50
04/06   61/40/51/+8/0.00/0.0/…/..      26 NNW  AERO 25 NNW  RMY 31
04/07   57/41/49/+6/0.00/0.0/…/..      23 ENE  AERO 21 ENE  RMY 22
04/08   59/43/51/+7/0.00/0.0/…/..      22 ENE  AERO 22 ENE  RMY 24
04/09   69/42/56/+12/0.00/0.0/…/..     24 S    AERO  M   M  RMY 26
04/10   75/43/59/+14/0.00/0.0/…/..     26 SSW  AERO 28 SSW  RMY 30
04/11   53/40/47/+2/T/0.0/…/..         33 ENE  AERO 33 ENE  RMY 34
04/12   46/37/42/-3/0.05/0.0/…/..      36 ENE  AERO 37 ENE  RMY 41
04/13   56/37/47/+1/T/0.0/…/..         31 NE   AERO 30 NE   RMY 33

04/14   The low since midnight is 42F, the daily normal low is 37F


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

RECORDS FOR APRIL 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 1.86 IN. IN 1935
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943

RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007

TODAY’S REPORT PREPARED BY: Matt Douglas