Sunday, April 21, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY EASTER WITH HAZY CONDITIONS AND PASSING SHOWERS….

Cloudy conditions have persisted throughout the day
so far on top of Great Blue Hill with only a few breaks
in overcast conditions experienced since 7 A.M. Although
there has been a distant haze present at each observation
today, visibility has remained relatively far at 70 miles
at each observation. Humidity has stayed at or above 85%
since yesterday, however, no fog was present at any
observation today. Short scattered showers have been passing
through the area, but only a trace of rain was measured
between 7 A.M. EST and 1 P.M. EST.

Today’s Observations:

7 A.M.
Weather: Overcast stratus, few cumulus in all directions,
distant haze in all directions
Temperature: 57F; Dew Point: 55F; Wind: S at 11 kts
Sea-level pressure: 30.01 ins. Hg, falling then rising
Visibility: 70 miles, distant haze in all directions
6-hr Max temp: 60F
6-hr Min temp: 56F
24-hr Precip: 0.33 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E30 OVC 70 163/57/55/1711/001/ FEW CU ALQDS
DSNT HZ ALQDS/ 8/6// 53009 70033 10060 20056

10 A.M.
Weather: Overcast stratus
Temperature: 59F; Dew Point: 56F; Wind: SSE at 6 kts
Sea-level pressure: 30.04 ins. Hg, rising, then more slowly
Visibility: 70 miles, distant haze in all directions
3-hr Precip: Trace
BHO SA 1455 E30 OVC 70 173/59/56/1606/004/ DSNT HZ ALQDS/
8/6// 53010 600//

1 P.M.
Weather: Broken altostratus, broken cirrostratus,
few cumulus in all directions, few altocumulus S-W
Temperature: 61F; Dew Point: 57F; Wind: SE at 5 kts
Wind: Light
Sea-level pressure: 30.02 ins. Hg, falling
Visibility: 70 miles, distant haze in all directions
6-hr Max temp: 61F
6-hr Min temp: 57F
6-hr Precip: Trace
6-hr snowfall: 0.0 ins.
BHO SA 1755 E100 BKN E200 BKN 70 166/61/57/1405/002/ FEW
CU ALQDS FEW AC S-W DSNT HZ ALQDS WND LGT/ 8/136 58007 600//
10061 20057

SUMMARY FOR SATURDAY, APRIL 20, 2019

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..58
MIN…..60   NORMAL…..40
MEAN….64   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL…………………..+15
TOTAL DEPARTURE FOR THE MONTH…………………..+69 [+3.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………1   DEPARTURE……..-16
TOTAL HEATING UNITS FOR THE MONTH………….339   DEPARTURE……..-66
TOTAL HEATING UNITS FOR THE SEASON………..5744   DEPARTURE…….-145
TOTAL HEATING UNITS LAST SEASON TO DATE……5555   DIFFERENCE……+189

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..50 SSW AT  1:30 P.M.
AERO…………………….54 SSW AT  1:30 P.M.
ASOS…………………….52 S   AT  1:16 P.M.
DAVIS……………………60 S   AT 12:49 A.M.  RMY 52
FASTEST MILE FOR YESTERDAY………………….44 SSW AT  1:22 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….38 S   AT  1:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………43 S   AT  1:24 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..23.9 S
ASOS…………………..22.6
DAVIS………………….23.5 SSE [167 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.33  DEPARTURE…….+0.20
ASOS…………..0.30
TOTAL PRECIPITATION FOR THE MONTH……….3.37  DEPARTURE…….+0.16
ASOS…………..3.23
TOTAL PRECIPITATION FOR THE YEAR……….16.41  DEPARTURE…….-0.80
ASOS………….16.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………0.0  DEPARTURE………0.0
TOTAL SNOWFALL FOR THE MONTH………….TRACE  DEPARTURE……..-2.7
TOTAL SNOWFALL FOR THE SEASON………….47.6  DEPARTURE…….-14.8

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

04/01 45/29/37/-4/0.00/0.0/726/98           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/…./0.0/582/79           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./0.0/468/63           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/…./0.0/690/93            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/…./0.0/324/44           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/…./0.0/516/69           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/306/41          24 S   AERO 18 S   RMY 25
04/08 48/34/41/-3/0.49/0.0/…/..           25 NE  AERO 20 NE  RMY 26
04/09 40/32/36/-8/0.08/0.0/…/..           23 NE  AERO 16 N   RMY 25
04/10 43/30/37/-8/T/T/T/..                  32 NW  AERO 26 NW  RMY 36
04/11 51/29/40/-5/0.00/0.0/…/..           23 NW  AERO 18 NW  RMY N/A
04/12 53/38/46/+1/…./0.0/…/..           35 SSW AERO 29 SSW RMY 39
04/13 71/54/63/+17/…./0.0/…/..          38 SSW AERO 32 SSW RMY N/A
04/14 71/51/61/+15/…./0.0/…/..          25 S   AERO 18 S   RMY N/A
04/15 67/40/54/+7/…./0.0/…/..           46 W   AERO 52 W   RMY 50
04/16 58/37/48/+1/0.00/0.0/…/..           46 W   AERO 44 W   RMY 44
04/17 62/36/49/+2/0.00/0.0/…/..           26 ESE AERO 25 S   RMY 28
04/18 63/39/51/+3/0.00/0.0/…/.. 44 S   AERO 44 S   RMY 50
04/19 71/58/65/+17/…/…/…/..           47 SSW AERO 51 SSW RMY 52
04/20 68/60/64/+15/…/…/…/..           50 SSW AERO 54 SSW RMY 52

04/21 Low temp since midnight is 56F; normal low is 40F

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

RECORDS FOR APRIL 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 IN. IN 1991
SNOWFALL 0.8 IN. IN 1947
PEAK GUST 76e MPH NE IN 1940

RECORDS FOR APRIL 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 1.85 IN. IN 2000
SNOWFALL 3.0 IN. IN 1940
PEAK GUST 68e MPH NW IN 1945

TODAY’S REPORT PREPARED BY: Samantha Richard