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Saturday, April 29, 2017

April 30, 2017

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, APRIL…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 29, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM AND CLOUDY DAY AT GREAT BLUE HILL

Temperatures today have continued to be well above normal. Today’s
maximum temperature before the 1:00 P.M. EST observation was 81F,
which is currently the same as yesterday’s maximum temperature.
Relative humidity remained in the 40%s. Pressure fell as wind speeds
began to pick up out of the southwest. It was cloudy all day with
mostly altocumulus and altostratus clouds. The sun was able to shine
a little bit through some small breaks. Visibility stayed only around
40 miles because of haze in the area all day.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, overcast altostratus
Temperature: 67F; Dew Point: 49F; Wind: SW at 9G14 kts
Sea-level pressure: 29.99 ins. Hg, falling, then rising
Visibility: 30 miles, hazy
6-hr Max temp: 67F
6-hr Min temp: 61F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 E90 BKN 120 OVC 30 155/67/49/2209G14/999/ HAZY/ 8/07/
55009 10067 20061

10 A.M.
Weather: Scattered altocumulus, broken altostratus
Temperature: 77F; Dew Point: 54F; Wind: SW at 11G18 kts
Sea-level pressure: 29.95 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze
3-hr precip: 0.00 in.
3-hr snowfall: 0.0 in.
BHO SA 1455 90 SCT E120 BKN 40 141/77/54/2311G18/995/ DSNT HZ ALQDS/
8/070 58014

1 P.M.
Weather: Few cumulus in all directions, scattered altocumulus, broken
altostratus, broken cirrus
Temperature: 80F; Dew Point: 57F; Wind: WSW 16G23 kts
Sea-level pressure: 29.85 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze
6-hr Max temp: 81F
6-hr Min temp: 66F
6-hr precip: 0.00 in.
6-hr snowfall: 0.0 in.
BHO SA 1755 90 SCT E220 BKN 300 BKN 40 109/80/57/2416G23/985/ FEW CU
ALQDS DSNT HZ ALQDS/ 8/171 56032 10081 20066

SUMMARY FOR FRIDAY, APRIL 28, 2017

TEMPERATURE (DEGREES F)
MAX…..81   NORMAL…..61
MIN…..56   NORMAL…..42
MEAN….69   NORMAL…..52

DEPARTURE FROM 30-YEAR NORMAL……………………+17
TOTAL DEPARTURE FOR THE MONTH…………………..+117 [+4.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-14
TOTAL HEATING UNITS FOR THE MONTH………….418   DEPARTURE……..-107
TOTAL HEATING UNITS FOR THE SEASON………..5320   DEPARTURE……..-689
TOTAL HEATING UNITS LAST SEASON TO DATE……4960   DIFFERENCE…….+360

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 W  AT 5:08 P.M.
AERO……………………23 W  AT 5:20 P.M.
ASOS……………………26 W  AT 5:10 P.M.
DAVIS…………………..23 W  AT 5:10 P.M. RMY 26
FASTEST MILE FOR YESTERDAY…………………19 W  AT 5:09 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 W  AT 5:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 W  AT 5:11 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.3 SW
ASOS………………….10.7
DAVIS………………….8.9 WSW [240 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……….6.65  DEPARTURE……+2.36
ASOS…………..6.76
TOTAL PRECIPITATION FOR THE YEAR……….20.77  DEPARTURE……+2.48
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………….2.7  DEPARTURE…….-0.3
TOTAL SNOWFALL FOR THE SEASON…………..66.4  DEPARTURE…….+3.7

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

4/1  35/31/33/-8/2.21/2.7/000/00           40 ENE AERO 41 ENE RMY 41
4/2  53/30/42/+1/0.00/0.0/552/72           32 NW  AERO 33 NW  RMY 34
4/3  60/35/48/+6/0.00/0.0/685/89           21 W*  AERO 20 NW  RMY N/A
4/4  42/35/39/-3/0.78/0.0/000/00           41 ESE AERO 43 ESE RMY 42
4/5  41/35/38/-5/0.00/0.0/000/00           21 NNW AERO 20 NNW RMY N/A
4/6  55/35/45/+2/1.27/0.0/000/00           35 SSE AERO 37 S   RMY 37  TSTM
4/7  53/38/46/+3/0.00/0.0/226/29           43 SSW AERO 47 SSW RMY 48
4/8  50/34/42/-2/0.00/0.0/666/85           37 WNW AERO 40 WNW RMY 39
4/9  65/34/50/+6/0.00/0.0/716/91           23 W   AERO 23 W   RMY N/A
4/10 77/45/61/+16/0.00/0.0/560/71          37 S   AERO 37 S   RMY 39
4/11 85/50/68/+23/0.00/0.0/642/81          28 S   AERO 28 S   RMY 30
4/12 68/47/58/+13/0.01/0.0/382/48          26 WNW AERO 28 WNW RMY N/A
4/13 58/39/49/+3/0.00/0.0/567/71           28 WNW AERO 31 NW  RMY 30
4/14 62/40/51/+5/0.00/0.0/801/100          22 NNW AERO 22 NNW RMY 24
4/15 68/40/54/+7/0.01/0.0/675/84           40 SSW AERO 45 SSW RMY 45
4/16 86/55/71/+24/T/0.0/758/94             38 W*  AERO 39 SW  RMY 42
4/17 75/48/62/+15/0.00/0.0/405/50          37 W   AERO 37 W   RMY 43
4/18 52/35/44/-4/0.00/0.0/779/96           25 ENE AERO 23 ENE RMY 25
4/19 54/34/44/-4/0.06/0.0/431/53           31 S   AERO 33 S   RMY 34
4/20 58/42/50/+1/0.05/0.0/270/33           25 SSW AERO 24 SSW RMY 23
4/21 45/42/44/-5/0.50/0.0/000/00           26 ESE AERO 29 ESE RMY 28
4/22 44/40/42/-7/0.14/0.0/…/..           22 NE  AERO 22 NNE RMY 20
4/23 65/37/51/+1/0.00/0.0/…/..           28 S   AERO 26 S   RMY 28
4/24 69/42/56/+6/0.00/0.0/…/..           23 SSW*AERO 22 SSW*RMY N/A
4/25 49/42/46/-4/…./0.0/…/..           35 NE  AERO 36 NE  RMY 35
4/26 60/47/54/+3/…./0.0/…/..           29 ENE AERO 28 ENE RMY N/A
4/27 66/50/58/+7/0.00/0.0/…/..           20 S   AERO 20 S   RMY N/A
4/28 81/56/69/+17/…/…/…/..           25 W   AERO 23 W   RMY 26

4/29 Low temp since midnight is 61F; normal low is now 52F

DAILY RECORDS FOR APRIL 2017

4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,
BREAKS PREVIOUS RECORD OF 78F SET IN 1945

4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
TIES WITH PREVIOUS RECORD SET IN 1955

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

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010

RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978

TODAY’S REPORT PREPARED BY: Lizzy Suzedell

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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