Wednesday, May 1, 2019

| May 1, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 1, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH LIGHT WINDS AND DRY CONDITIONS….
APRIL FINISHES AS THE SIXTH WETTEST ON RECORD…

The highest visibility observed today was 70 miles
at the 1 P.M. Conditions have remained overcast yet
dry, with an average humidity of 45% throughout the
day. Wind has remained light since yesterday, but
has shifted from N-SSW as the day went on. The high
so far today is 57F, 5 degrees below the daily normal
maximum of 62F. The low since midnight is 40F, 3
degrees below the daily normal of 43F.

BHO Greatest April Precipitation, inches (1885-2019):

1) 10.37 in 1987
2)  9.38 in 2004
3)  8.71 in 1929
4)  8.68 in 2007
5)  8.53 in 1904
6)  8.14 in 2019
7)  7.57 in 1935
7.57 in 1983
9)  7.31 in 1901

The calendar day rainfall on Monday, 4/22, was more than
two and a half inches, which made it one of the wettest
calendar days ever observed in April. The finalized
amount for the day will be reported when available.

BHO Greatest April Calendar Day Precipitation, inches (1885-2019):

1) 3.47 on April 1,  2004
2) 3.18 on April 21, 1991
3) 2.63 on April 16, 2018
4) 2.51 on April 24, 1898
2.51 on April 13, 2004
6) 2.45 on April 16, 1929
7) 2.41 on April 28, 1904
8) 2.40 on April 10, 1935

Today’s Observations:

7 A.M.
Weather: Overcast altostratus
Temperature: 47F; Dew Point: 30F; Wind: N at 4 kts,
Wind: Light
Sea-level pressure: 30.47 ins. Hg, rising steadily
Visibility: 60 miles
6-hr Max temp: 47F
6-hr Min temp: 40F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E110 BKN 60 320/47/30/3605/047/ WND LGT/
8/020 53011 10047 20040

10 A.M.
Weather: Overcast altostratus
Temperature: 50F; Dew Point: 34F; Wind: E at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.48 ins. Hg, falling then rising
Visibility: 50 miles, thin smoke layer in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 E70 OVC 50 322/50/34/0903/048/ THN K LYR
ALQDS WND L/V/ 8/01/ 50002

1 P.M.
Weather: Overcast stratus
Temperature: 56F; Dew Point: 29F; Wind: SSW at 8 kts
Sea-level pressure: 30.42 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 47F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E60 OVC 70 301/56/29/2108/042/ 8/6// 56021
10057 20047

SUMMARY FOR TUESDAY, APRIL 30, 2019

TEMPERATURE (DEGREES F)
MAX…..48   NORMAL…..61
MIN…..40   NORMAL…..43
MEAN….44   NORMAL…..52

DEPARTURE FROM 30-YEAR NORMAL……………………-8
TOTAL DEPARTURE FOR THE MONTH…………………..+53 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..21   DEPARTURE………+8
TOTAL HEATING UNITS FOR THE MONTH………….496   DEPARTURE……..-55
TOTAL HEATING UNITS FOR THE SEASON………..5880   DEPARTURE…….-134
TOTAL HEATING UNITS LAST SEASON TO DATE……5669   DIFFERENCE……+208

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 NW  AT  7:35 P.M.
AERO…………………….23 NW  AT  8:27 P.M.
ASOS…………………….25 NW  AT  7:28 P.M.
DAVIS……………………26 WNW AT  7:28 P.M.  RMY 25
FASTEST MILE FOR YESTERDAY………………….16 NW  AT  6:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 NNW AT  6:53 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 WNW AT  6:53 P.M.
AVERAGE WIND SPEED AND DIRECTION……………6.3 NW
ASOS……………………6.3
DAVIS…………………..6.3 NW [259 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE…….-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….8.14  DEPARTURE…….+3.59
ASOS…………..8.06
TOTAL PRECIPITATION FOR THE YEAR……….21.18  DEPARTURE…….+2.63
ASOS………….21.21

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………0.0  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH………….TRACE  DEPARTURE……..-3.0
TOTAL SNOWFALL FOR THE SEASON………….47.6  DEPARTURE…….-15.1

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/-4/0.00/0.0/748/98           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/…./0.0/605/79           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./0.0/484/63           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/…./0.0/717/93            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/…./0.0/341/44           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/…./0.0/536/69           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/320/41          24 S   AERO 18 S   RMY 25
04/08 48/34/41/-3/0.49/0.0/000/00           25 NE  AERO 20 NE  RMY 26
04/09 40/32/36/-8/0.08/0.0/000/00           23 NE  AERO 16 N   RMY 25
04/10 43/30/37/-8/T/T/000/00                32 NW  AERO 26 NW  RMY 36
04/11 51/29/40/-5/0.00/0.0/403/51           23 NW  AERO 18 NW  RMY N/A
04/12 53/38/46/+1/…./0.0/000/00           35 SSW AERO 29 SSW RMY 39
04/13 71/54/63/+17/…./0.0/167/21          38 SSW AERO 32 SSW RMY N/A
04/14 71/51/61/+15/…./0.0/224/28          25 S   AERO 18 S   RMY N/A
04/15 67/40/54/+7/…./0.0/168/21           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/…./0.0/…/..          47 SSW AERO 51 SSW RMY 52
04/20 68/60/64/+15/…./0.0/…/..          50 SSW AERO 54 SSW RMY 52
04/21 68/51/60/+11/…./0.0/…/..          35 S   AERO 35 S   RMY N/A
04/22 53/45/49/0/…./0.0/…/..            35 NNE AERO 32 NNE RMY 35
04/23 52/44/48/-2/…./0.0/…/..           30 NNE AERO 26 NNE RMY N/A
04/24 65/44/55/+5/…./0.0/…/..           29 WNW AERO 29 WNW RMY 30
04/25 61/39/50/0/0.00/0.0/…/..            22 S   AERO 22 S   RMY 21
04/26 53/42/48/-3/…./0.0/…/..           35 ESE AERO 30 W   RMY 33
04/27 54/39/47/-4/…./…/…/..           41 W   AERO 44 W   RMY 47
04/28 51/38/45/-7/0.08/0.0/…/..           28 W   AERO 28 W   RMY N/A
04/29 60/34/47/-5/0.00/0.0/…/..           23 NW  AERO 24 WNW RMY 24
04/30 48/40/44/-8/0.17/0.0/…/..           26 NW  AERO 23 NW  RMY 25

05/01 Low temp since midnight is 40F; normal low is 43F

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

RECORDS FOR MAY 1
HIGH 87F IN 1899
LOW 29F IN 1978
PRECIP 2.53 INCHES IN 1921
SNOWFALL TRACE IN 1905,1917,1921,1995,2016
PEAK GUST 57 MPH NW IN 1974

RECORDS FOR MAY 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL 1.0 INS IN 1888
PEAK GUST 58 MPH S IN 1983

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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