Wednesday, April 10, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 10, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLOUDS WITH INTENSIFYING NORTHWESTERLY
WINDS IN THE AFTERNOON….

This morning we measured 0.08 inches from last night’s
rainfall. A light snow shower occurred shortly before
and following the 7 A.M. observation. Wind has increased
since this morning, reaching a peak gust so far of 32 mph.
Due to some cold air advection and overcast skies,
temperatures continue to remain below seasonal averages.
The high so far today is 42F, 11 degrees below the normal of
53F. The low since midnight is 34F, 2 degrees below the daily
normal minimum of 36F.

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:  5405 [-79] 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: Broken nimbostratus and light snow, few
stratus fractus
Temperature: 34F; Dew Point: 34F; Wind: NW at 10G15 kts
Sea-level pressure: 29.74 ins. Hg, rising steadily
Visibility: 20 miles due to distant fog, 60 miles WNW-E
6-hr Max temp: 36F
6-hr Min temp: 34F
24-hr Precip:  0.08 ins.
24-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1155 E65 BKN 20S- 071/34/34/3310G15/974/ FEW
STFA ALQDS DSNT FOG E-WNW VSBY 60 WNW-E S-CTD/ 8/060
70008 53026 10036 20034

10 A.M.
Weather: Broken stratocumulus, few cumulus offshore
Temperature: 38F; Dew Point: 28F; Wind: NW at 15G22 kts
Sea-level pressure: 29.78 ins. Hg, rising steadily
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E35 BKN 80 086/38/28/3215G22/978/ FEW CU
OFFSHR/ 8/400 600// 51015

1 P.M.
Weather: Broken stratocumulus
Temperature: 41F; Dew Point: 28F; Wind: NW at 12G23 kts,
Peak wind: 32 MPH (28 kts) NW at 10:36 A.M.
Sea-level pressure: 29.81 ins. Hg, rising steadily
Visibility: 85 miles
6-hr Max temp: 42F
6-hr Min temp: 34F
6-hr Precip:  Trace
6-hr snowfall: Trace
BHO SA 1755 E35 BKN 85 093/41/28/3212G23/981/ PK WND
3228/1536/ 8/400 600// 53007 10042 20034

SUMMARY FOR TUESDAY, APRIL 9, 2019

TEMPERATURE (DEGREES F)
MAX…..40   NORMAL…..53
MIN…..32   NORMAL…..35
MEAN….36   NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL……………………-8
TOTAL DEPARTURE FOR THE MONTH…………………….0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..29   DEPARTURE………+8
TOTAL HEATING UNITS FOR THE MONTH………….202   DEPARTURE……….0
TOTAL HEATING UNITS FOR THE SEASON………..5607   DEPARTURE……..-78
TOTAL HEATING UNITS LAST SEASON TO DATE……5303   DIFFERENCE……+304

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 NE  AT 7:01 P.M.
AERO…………………….16 N   AT 5:50 P.M.
ASOS…………………….25 SE  AT 6:58 P.M.
DAVIS……………………26 ESE AT 6:58 P.M.  RMY 25
FASTEST MILE FOR YESTERDAY………………….19 NE  AT 7:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 ESE AT 7:04 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 ESE AT 7:04 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….7.6 ENE
ASOS…………………….7.9
DAVIS……………………7.9 E [79 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.08  DEPARTURE…….-0.09
ASOS…………..0.07
TOTAL PRECIPITATION FOR THE MONTH……….1.23  DEPARTURE…….-0.29
ASOS…………..1.18
TOTAL PRECIPITATION FOR THE YEAR……….14.27  DEPARTURE…….-1.25
ASOS………….14.33

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..Trace  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH…………..Trace  DEPARTURE……..-1.5
TOTAL SNOWFALL FOR THE SEASON…………..47.6  DEPARTURE…….-13.6

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/-3/0.00/0.5/479/71           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/0.48/3.7/000/00           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 Low temp since midnight is 40F; normal low is 36F

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

RECORDS FOR APRIL 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967

RECORDS FOR APRIL 11
HIGH 85 IN 2017
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963

TODAY’S REPORT PREPARED BY: Benjamin Turner