Thursday, April 23, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 23, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

ABUNDANT SUNSHINE WITH EXCELLENT VISIBILITY
WITH MILDER TEMPERATURES….

We observed very few clouds until noontime, where
pressure began a steady decline. Most of the clouds
were upper level, as the humidity at the surface is
only 18%. Wind was much lighter in comparison to
yesterday, but reached 29 mph following the 1 P.M.
observation.

Our high temperature so far today is 52F, which is 7
degrees below our daily normal high temperature of 59F.
The low since midnight is 29F, which is 12 degrees below
the daily normal low of 41F.

Today’s Observations:

7 A.M.
Weather: Few cirrus
Temperature: 34F; Dew Point: 15F; Relative Humidity: 45%
Wind: W at 7 kts
Sea-level pressure: 30.01 ins. Hg: rising steadily
Visibility: 80 miles
6-hr Max temp: 34F
6-hr Min temp: 29F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 CLR 80 164/34/15/2707/001/ FEW CI ALQDS/
8/002 53016 10034 20029

10 A.M.
Weather: Few cirrus
Temperature: 44F; Dew Point: 10F; Relative Humidity: 24%
Wind: W at 12G17 kts
Sea-level pressure: 30.03 ins. Hg: falling then rising
Visibility: 85 miles
3-hr Precip:   0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 85 170/44/10/2612G17/003/ FEW CI ALQDS/
8/002 50006

1 P.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 52F; Dew Point: 10F; Relative Humidity: 18%
Wind: WSW at 11G20 kts
Sea-level pressure: 30.00 ins. Hg: falling unsteadily
Visibility: 80 miles
6-hr Max temp: 52F
6-hr Min temp: 34F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 70 SCT E240 BKN 80 161/52/10/2411G20/000/ 8/078
56009 10052 20034

SUMMARY FOR WEDNESDAY, APRIL 22, 2020

TEMPERATURE (DEGREES F)
MAX…..43   NORMAL…..58
MIN…..30   NORMAL…..40
MEAN….37   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL……………….-12
TOTAL DEPARTURE FOR THE MONTH……………….-39 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………28  DEPARTURE…….+12
TOTAL HEATING UNITS FOR THE MONTH…………..475  DEPARTURE…….+38
TOTAL HEATING UNITS FOR THE SEASON…………5348  DEPARTURE……-573
TOTAL HEATING UNITS LAST SEASON TO DATE…….5764  DEPARTURE……-416

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..51 W   AT  1:46 P.M.
AERO…………………….50 W   AT  1:18 P.M
ASOS…………………….50 W   AT  1:46 P.M.
DAVIS……………………50 W   AT  8:09 A.M. RMY 50
FASTEST MILE FOR YESTERDAY………………….39 W   AT  8:10 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….37 W   AT  8:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………39 W   AT  8:10 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….22.3 W
ASOS…………………….20.2
DAVIS……………………22.6 W [279 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….6.00  DEPARTURE……+2.52
ASOS…………..6.19
TOTAL PRECIPITATION FOR THE YEAR……….15.33  DEPARTURE……-2.15
ASOS………….15.92

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.0
TOTAL SNOWFALL FOR THE MONTH…………….4.3  DEPARTURE…….+1.5
TOTAL SNOWFALL FOR THE SEASON…………..31.9  DEPARTURE……-30.6

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  42/28/35/-6/0.00/0.0/008/01         28 NE  AERO 28 NE  RMY 30
04/02  46/35/41/0/…/0.0/000/00           39 NW  AER0 40 NW  RMY 41
04/03  42/38/40/-2/…./0.0/000/00         48 NE  AERO 53 NE  RMY 49
04/04  46/36/41/-1/…./0.0/278/36         38 NE  AERO 38 NE  RMY N/A
04/05  55/36/46/+3/T/0.0/039/05            22 S   AERO 21 S   RMY 21
04/06  61/40/51/+8/0.00/0.0/732/94         29 NW  AERO 30 NW  RMY 29
04/07  63/42/53/+10/0.00/0.0/649/83        29 W   AERO 30 W   RMY 28
04/08  50/41/46/+2/…./…/047/06         23 S   AERO 22 S   RMY 22
04/09  47/37/42/-2/…./…/000/00         58 W   AERO 58 W   RMY 56
04/10  47/35/41/-4/0.02/T/324/41           48 W   AERO 50 W   RMY 53
04/11  51/33/42/-3/0.00/0.0/730/92         38 WNW AERO 39 WNW RMY 40
04/12  60/33/47/+2/0.00/0.0/326/41         38 S   AERO 40 S   RMY N/A
04/13  59/50/55/+9/1.42/0.0/000/00         79 S   AERO 83 S   RMY 78
04/14  57/41/49/+3/0.00/0.0/…/..         41 W   AERO 40 W   RMY N/A
04/15  52/36/44/-3/0.02/0.0/…/..         37 W   AERO 36 W   RMY 37
04/16  47/32/40/-7/T/T/…/..              33 WNW AERO 33 WNW RMY 32
04/17  49/29/39/-8/…./0.0/…/..         41 W   AERO 39 W   RMY 41
04/18  37/31/34/-14/…./4.3/…/..        29 NE  AERO 25 NE  RMY 25
04/19  60/31/46/-2/0.00/0.0/…/..         40 SSW AERO 40 SSW RMY 41
04/20  49/37/43/-6/0.00/0.0/…/..         25 ENE AERO 22 W   RMY N/A
04/21  53/33/43/-6/…./…/…/..         52 S   AERO 52 S   RMY 52
04/22  43/30/37/-12/0.00/0.0/…/..        51 W   AERO 50 W   RMY 50

04/23 The low since midnight is 29F, daily normal minimum is 41F

DAILY RECORDS FOR APRIL 2020

4/13/2020
NEW PEAK GUST OF 79 MPH S, REPLACING THE OLD
RECORD OF 59 MPH SSW IN 1995

4/18/2020
NEW RECORD SNOWFALL OF 4.3 INS, REPLACING THE OLD
RECORD OF 3.7 INS IN 1965

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

RECORDS FOR APRIL 23
HIGH 85 IN 1908, 2007
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 2.0 IN. IN 2012
PEAK GUST 64 MPH WNW IN 1962

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

TODAY’S REPORT PREPARED BY: Benjamin Turner