Thursday, May 2, 2019

| May 2, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 2, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY THROUGHOUT THE DAY WITH MINIMAL
VISIBILITY….

Fog limited visibility to only 1/16 miles today.
Wind was 10 mph on average from the northeast,
with a max gust so far of 21 mph. A light drizzle
was observed shortly following noontime, and has
continued past the 1 P.M. observation. The high
so far today is 45F, 17 degrees below the daily normal
maximum of 62F. The low since midnight is 42F, a
degree below the daily normal of 43F.

BHO Greatest April Precipitation, inches (1886-2019):

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 (1886-2019):

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: Fog
Temperature: 44F; Dew Point: 44F; Wind: NE at 9G12 kts
Sea-level pressure: 30.19 ins. Hg, rising steadily
Visibility: 1/16th mile, fog
6-hr Max temp: 45F
6-hr Min temp: 44F
24-hr Precip: 0.01 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 W3 X 1/16F 222/44/44/0409G12/019/ 8//// 70001
53018 10045 20044

10 A.M.
Weather: Fog
Temperature: 43F; Dew Point: 43F; Wind: NE at 8G16 kts
Sea-level pressure: 30.17 ins. Hg, rising steadily
Visibility: 1/16 mile, fog
3-hr Precip: 0.00 ins.
BHO SA 1455 W3 X 1/16F 218/43/43/0508G16/017/ 8//// 50004

1 P.M.
Weather: Fog, light drizzle
Temperature: 42F; Dew Point: 42F; Wind: E at 9G18 kts
Sea-level pressure: 30.13 ins. Hg, rising steadily
Visibility: 1/16 mile, fog
6-hr Max temp: 45F
6-hr Min temp: 42F
6-hr Precip:  Trace
6-hr snowfall: 0.0 ins.
BHO SA 1755 W3 X 1/16L-F 206/42/42/0709G18/013/ L-CTD/
8//// 600// 50012 10045 20042

SUMMARY FOR WEDNESDAY, MAY 1, 2019

TEMPERATURE (DEGREES F)
MAX…..57   NORMAL…..62
MIN…..40   NORMAL…..43
MEAN….49   NORMAL…..53

DEPARTURE FROM 30-YEAR NORMAL……………………-4
TOTAL DEPARTURE FOR THE MONTH……………………-4 [-4.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16   DEPARTURE………+4
TOTAL HEATING UNITS FOR THE MONTH…………..16   DEPARTURE……….3
TOTAL HEATING UNITS FOR THE SEASON………..5917   DEPARTURE…….-130
TOTAL HEATING UNITS LAST SEASON TO DATE……5706   DIFFERENCE……+211

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 S   AT 11:26 P.M.
AERO…………………….21 SSE AT  8:52 P.M.
ASOS…………………….21 S   AT  3:30 P.M.
DAVIS……………………21 S   AT  3:30 P.M.  RMY 21
FASTEST MILE FOR YESTERDAY………………….16 NW  AT 11:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 S   AT 11:53 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 SSE AT 11:53 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.4 S
ASOS……………………7.8
DAVIS…………………..7.9 S [191 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE…….-0.11
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….0.01  DEPARTURE…….-0.11
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE YEAR……….21.19  DEPARTURE…….+2.52
ASOS………….21.22

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

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 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

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

05/01 57/40/49/-4/0.00/0.0/…/..           21 S   AERO 21 SSE  RMY 21

05/02 Low temp since midnight is 42F; normal low is 44F

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

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

RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

Leave a Reply