Monday, April 26, 2021

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

MONDAY, APRIL 26, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0446E
SUNSET:  1839E

BRIGHT SUNSHINE TODAY, BUT WINDY AND COOL….

Following the mainly cloudy and somewhat wet day yesterday,
today has been the total opposite with nearly full sunshine
thus far. The only thing that I’m sure many are not fond of
today are the cool temperatures and brisk northwest wind.

The wind has been averaging around 16 mph since 7 A.M. this
morning with frequent gusts over 30 mph occuring. Combined
this with temperatures in the 50s and dew points in the 20s,
it certainly adds a chill to the air.

Visibility has been excellent averaging around 60 miles
today.

The high so far today is 54F, this is 6 degrees below the
normal high of 60F. The low since midnight is 40F, which
is 2 degrees below the daily normal low of 42F.

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus all quadrants,
few cirrus distant N-NE
Temperature: 43F; Dew Point: 31F; Relative Humidity: 62%
Wind: NW at 15G24 kts, peak wind NW 31 mph at 6:14 A.M.
Sea-level pressure: 29.83 in Hg, rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 43F
6-hr Min temp: 40F
24-hr Precip: 0.20 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1155 CLR 60 100/43/31/3115G24/983/ FEW SC ALQDS
FEW CI DSNT N-NE PK WND 3127/14/ 8/501 51026 70020 10043 20040

10 A.M.
Weather: Clear, few stratocumulus all quadrants,
few cirrus distant S-SW
Temperature: 46F; Dew Point: 25F; Relative Humidity: 43%
Wind: WNW @ 16G25 kts, peak wind NW 36 mph at 9:43 A.M.
Sea-level pressure: 29.86 in Hg; rising, then more rapidly
Visibility: 60 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.00 ins.
BHO SA 1455 CLR 60 113/46/25/3016G25/986/ FEW SC ALQDS
FEW CI DSNT S-SW PK WND 3131/43/ 8/501 53013

1 P.M.
Weather: Clear, few stratocumulus all quadrants,
few cirrus distant SSE-S
Temperature: 52F, Dew point: 22F; Relative Humidity: 30%
Wind: WNW @ 15G25 kts, peak wind WNW 37 mph at 12:03 P.M.
Sea-level pressure: 29.85 in Hg; falling, then rising
Visibility: 60 miles
6-hr Max temp: 54F
6-hr Min temp: 43F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 60 110/52/22/3015G25/985/ FEW SC AQLDS
FEW CI DSNT SSE-S PK WND 2932/03/ 8/501 55003 10054 20043

SUMMARY FOR SUNDAY, APRIL 25, 2021

TEMPERATURE (DEGREES F)
MAX…….54     NORMAL…..60
MIN…….44     NORMAL…..41
MEAN……49     NORMAL…..50

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. -1
TOTAL DEPARTURE FOR THE MONTH……………….+31 [+1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………16  DEPARTURE…….+1
TOTAL HEATING UNITS FOR THE MONTH…………..450  DEPARTURE……-33
TOTAL HEATING UNITS FOR THE SEASON…………5272  DEPARTURE…..-694
TOTAL HEATING UNITS LAST SEASON TO DATE…….5412  DEPARTURE…..-140

PEAK WIND GUST (MPH):
                     420C/Official…………..23 NNE @  3:36 P.M.
                     AEROVANE (south tower)…..20 SSW @  6:52 A.M
                     ASOS…………………..22 S   @  6:53 A.M
                     DAVIS #1……………….23 SSW @  7:07 A.M
                     DAVIS #2 (south tower)…..22 S   @  5:00 A.M
                     RMY……………………24     @  3:35 P.M
                     VECTOR…………………24     @  7:06 A.M
                     MERLIN…………………N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 S   @  6:38 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 SSW @  7:08 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 SSW @  6:36 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 S   @  6:36 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..16 SSW @  6:32 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..16     @  7:04 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…… 8.3 S [198 total miles]                     ASOS………………… 8.4
                     DAVIS #1…………….. 8.3 ESE
                     DAVIS #2…………….. 8.7 ESE
                     RMY…………………. 8.3 SE
                     VECTOR………………. 8.7

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.20  DEPARTURE….+0.06
                             ASOS………….0.21
TOTAL PRECIPITATION FOR THE MONTH………….4.21  DEPARTURE….+0.32
                             ASOS………….4.12
TOTAL PRECIPITATION FOR THE YEAR………….14.38  DEPARTURE….-3.50
                              ASOS………..14.63

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE….. 0.0
TOTAL SNOWFALL FOR THE MONTH ………………3.6  DEPARTURE…..+0.7
TOTAL SNOWFALL FOR THE SEASON……………..76.2  DEPARTURE….+14.1

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/000/00        44 NW   AERO 51 NW   RMY 49
04/02   37/24/31/-10/0.00/0.0/614/80     28 NW   AERO 32 NNW  RMY 30
04/03   48/23/36/-6/0.00/0.0/755/98      24 NW   AERO 25 NW   RMY 26
04/04   58/33/46/+4/0.00/0.0/734/95      38 NNW  AERO 41 NNW  RMY 41
04/05   57/41/49/+6/T/T/031/04           41 NNW  AERO 48 NNW  RMY 50
04/06   61/40/51/+8/0.00/0.0/412/53      26 NNW  AERO 25 NNW  RMY 31
04/07   57/41/49/+6/0.00/0.0/391/50      23 ENE  AERO 21 ENE  RMY 22
04/08   59/43/51/+7/0.00/0.0/745/95      22 ENE  AERO 22 ENE  RMY 24
04/09   69/42/56/+12/0.00/0.0/707/90     24 S    AERO  M   M  RMY 26
04/10   75/43/59/+14/0.00/0.0/576/73     26 SSW  AERO 28 SSW  RMY 30
04/11   53/40/47/+2/T/0.0/000/00         33 ENE  AERO 33 ENE  RMY 34
04/12   46/37/42/-3/0.05/0.0/000/00      36 ENE  AERO 37 ENE  RMY 41
04/13   56/37/47/+1/T/0.0/415/52         31 NE   AERO 30 NE   RMY 33
04/14   56/42/49/+3/0.00/0.0/729/91      22 ESE  AERO 23 ESE  RMY 22
04/15   51/37/44/-3/0.30/0.0/016/02      26 ESE  AERO 25 ESE  RMY 28
04/16   39/31/35/-12/2.22/3.6/000/00     48 NNW  AERO 58 NNW  RMY 58
04/17   45/34/40/-7/0.07/T/040/05        27 NNW  AERO 30 NNW  RMY 29
04/18   60/38/49/+1/0.00/0.0/666/82      28 NW   AERO 28 NW   RMY 31
04/19   66/44/55/+7/T/0.0/…/..         22 SSW  AERO 25 SSW  RMY 28
04/20   72/45/59/+10/0.00/0.0/…/..     38 SW   AERO 37 WSW  RMY 40
04/21   68/32/50/+1/0.48/*T/…/..       45 S    AERO 51 S    RMY 51 TSTM
04/22   44/28/36/-13/T/T/…/..          54 W    AERO 55 W    RMY 59
04/23   58/32/45/-5/0.00/0.0/…/..      47 W    AERO 48 W    RMY 52
04/24   70/44/57/+7/0.00/0.0/…/..      33 WNW  AERO 37 WNW  RMY 55
04/25   54/44/49/-1/0.20/0.0/…/..      23 NNE  AERO 20 SSW  RMY 24

04/26   The low since midnight is 40F, the daily normal low is 42F

*Trace of frozen on 04/21 was hail, 1/8″ diameter, this does not
count as snowfall.

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

RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996

RECORDS FOR APRIL 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941

TODAY’S REPORT PREPARED BY: Matt Douglas