Tuesday, April 16, 2019

| April 16, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 16, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER AND BREEZY WITH GOOD VISIBILITY
ATOP GREAT BLUE HILL….

Rainfall since the 7 A.M. observation yesterday amounted
to 0.16 inches, which included the convective patches of
rain yesterday afternoon. Visibility has been excellent
today, being almost 85 miles on average. Despite unhindered
sunlight, temperatures remain below normal throughout the
day due to significant cold air advection from the west.
Wind has remained westerly, with an average speed of 23 mph
and a max gust so far today of 45 mph. The high temperature
so far today is 55F, a degree below our normal maximum
temperature of 56F. The low since midnight is 37F, a
degree below our normal minimum temperature of 38F.

PRELIMINARY STATS FOR MARCH 2019

TEMPERATURE, Deg. F
Avg. Max. 44.0 [-0.3]
Avg. Min. 26.1 [-0.5]
Mean      35.1 [-0.4]
24-hour corrected mean: 34.7
Max. for month: 67F on the 30th
Min. for month: 6F  on the 7th

HEATING DEGREE DAYS
Total heating units:    919  [+3]
Total for the season:  5404 [-80]
Total for last season: 5058

PRECIPITATION, Inches
Total: 4.08 [-1.50]
Greatest in 24 hrs: 1.82 ins. on the 3rd-4th

SNOWFALL, Inches
Total: 23.1 [+10.4]
Greatest in 24 hrs: 15.8 ins. on the 3rd-4th

WIND, mph
Avg. uncorrected wind speed: 13.2
Avg. corrected wind speed: 13.5
Prevailing wind direction: W at 20%
Peak gust and direction: 53 S on 31st

SUNSHINE:
Campbell-Stokes card minutes: 12612 minutes of possible 21516 or 59%
Astronomical total minutes:   13031 minutes of possible 22220 or 59%

Today’s Observations:

7 A.M.
Weather: Scattered cumulus
Temperature: 40F; Dew Point: 22F; Wind: WNW at 22G32 kts,
Peak wind: 41 MPH (36 kts) WNW at 5:48 A.M.
Sea-level pressure: 29.79 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 40F
6-hr Min temp: 37F
24-hr Precip:  0.16 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 40 SCT 80 089/40/22/2922G32/979/ PK WND 2936/1048/
8/100 70016 51034 10040 20037

10 A.M.
Weather: Scattered cumulus
Temperature: 48F; Dew Point: 25F; Wind: WNW at 21G33 kts,
Peak wind: 41 MPH (36 kts) WNW at 8:45 A.M
Sea-level pressure: 29.83 ins. Hg, rising, then more quickly
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 40 SCT 85 102/48/25/2921G33/983/ PK WND 2936/1345/
8/100 51013

1 P.M.
Weather: Scattered cumulus
Temperature: 55F; Dew Point: 27F; Wind: WNW at 15G28 kts
Sea-level pressure: 29.84 ins. Hg, rising steadily
Visibility: 85 miles
6-hr Max temp: 55F
6-hr Min temp: 40F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 40 SCT 85 105/55/27/2915G28/984/ PK WND 2937/1615/
8/100 53003 10055 20040

SUMMARY FOR MONDAY, APRIL 15, 2019

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..56
MIN…..40   NORMAL…..38
MEAN….54   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL……………………+7
TOTAL DEPARTURE FOR THE MONTH…………………..+28 [+1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..11   DEPARTURE………-7
TOTAL HEATING UNITS FOR THE MONTH………….291   DEPARTURE……..-28
TOTAL HEATING UNITS FOR THE SEASON………..5696   DEPARTURE…….-106
TOTAL HEATING UNITS LAST SEASON TO DATE……5439   DIFFERENCE……+257

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..46 W   AT  7:00 P.M.
AERO…………………….52 W   AT  6:58 P.M.
ASOS…………………….50 WNW AT  7:06 P.M.
DAVIS……………………50 WSW AT  6:59 P.M.  RMY 50
FASTEST MILE FOR YESTERDAY………………….36 WNW AT  7:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….35 WNW AT  7:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………37 WSW AT  7:06 P.M.
AVERAGE WIND SPEED AND DIRECTION………….19.6 WNW
ASOS………………….18.6
DAVIS…………………19.3 SW [219 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.16  DEPARTURE…….+0.01
ASOS…………..0.16
TOTAL PRECIPITATION FOR THE MONTH……….2.84  DEPARTURE…….+0.33
ASOS…………..2.74
TOTAL PRECIPITATION FOR THE YEAR……….15.88  DEPARTURE…….-0.63
ASOS………….15.89

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……..-2.2
TOTAL SNOWFALL FOR THE SEASON………….47.6  DEPARTURE…….-14.3

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

03/01 38/17/28/-3/0.00/0.0/479/71           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/0.48/4.2/000/00           29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/0.12/1.5/367/54           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/1.70/14.3/130/19          33 W   AERO 18 W   RMY 32
03/05 29/10/20/-12/0.00/0.0/664/97          28 WNW AERO 12 SW  RMY N/A
03/06 24/10/17/-15/0.00/0.0/667/97          40 WNW AERO 25 WNW RMY 41
03/07 26/6/16/-17/0.00/0.0/359/52           35 W   AERO 18 W   RMY 34
03/08 35/11/23/-10/0.00/0.0/555/80          23 WSW AERO M  M   RMY M
03/09 43/22/33/0/0.00/0.0/683/98            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/0.53/1.0/000/00            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/0.00/0.0/555/79           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/0.00/0.0/494/70            32 N   AERO 33 N   RMY 34
03/13 43/24/34/0/0.00/0.0/404/57            18 W   AERO 21 W   RMY 23
03/14 48/32/40/0/0.00/0.0/121/17            25 S   AERO 28 S   RMY M
03/15 58/40/49/+14/0.12/0.0/000/00          37 SSW AERO 38 SSW RMY 39
03/16 50/31/41/+6/0.00/0.0/695/97           45 W   AERO 46 W   RMY 48
03/17 40/26/33/-3/0.00/0.0/590/82           40 WNW AERO M  M   RMY N/A
03/18 41/22/32/-4/0.00/0.0/694/96           29 W   AERO M  M   RMY 30
03/19 44/25/35/-1/0.00/0.0/587/81           25 W   AERO M  M   RMY N/A
03/20 50/27/39/+2/0.00/0.0/684/94           26 S   AERO M  M   RMY 29
03/21 50/33/42/+5/0.02/0.0/227/31           25 SSE AERO M  M   RMY 46
03/22 39/34/37/0/0.86/T/000/00              40 W   AERO M  M   RMY 44
03/23 45/28/37/-1/0.12/2.1/523/71           45 WNW AERO M  M   RMY 50
03/24 56/29/43/+5/0.00/0.0/437/59           28 W   AERO M  M   RMY 30
03/25 49/32/41/+3/0.00/0.0/468/63           25 NNW AERO M  M   RMY N/A
03/26 43/27/35/-4/0.00/0.0/716/96           28 NW  AERO M  M   RMY 28
03/27 42/24/33/-6/0.00/0.0/703/94           21 S   AERO M  M   RMY 23
03/28 51/28/40/+1/0.00/0.0/623/83           35 S   AERO M  M   RMY 37
03/29 53/40/47/+7/0.02/0.0/000/00           26 SSW AERO M  M   RMY 27
03/30 67/40/54/+14/0.00/0.0/477/63          44 S   AERO M  M   RMY 46
03/31 65/34/50/+9/0.10/0.0/129/17           53 S   AERO 52 S   RMY 55

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/…/..           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/…./0.0/…/..           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./0.0/…/..           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/…./0.0/…/..            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/…./0.0/…/..           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/…./0.0/…/..           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/…/..          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 Low temp since midnight is 37F; normal low is 38F

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

RECORDS FOR APRIL 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.45 IN. IN 1929
SNOWFALL 2.0 IN. IN 1904, 1962
PEAK GUST 73 MPH E IN 2007

RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW 21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 63 MPH ESE IN 2011

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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