Sunday, March 25, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MARCH 25, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST SKIES PRODUCE LIGHT SNOW SHOWERS
THROUGHOUT THE DAY…

Snow yesterday afternoon and we have observed
scattered showers until this afternoon. Overnight
1.8 ins. of snow fell on top of Great Blue Hill.
Although we had scattered showers we only measured
a trace of accumulation by 1:00 P.M.
The overnight low temperature was a seasonable 30F.
So far today the high temperatures is below
seasonable with a high of 34F, this is 13 degrees
below the normal of 47F. Yesterday’s light wind
picked up around 4:00 A.M. and we have had
moderate wind with frequent gust of 22 kts (25 MPH)
from the NNE today.

Blue Hill Observatory Greatest March Snowfall Totals,
Inches (1885-2018)

1) 52.0 in 1956
2) 45.5 in 2018 (through 3/24)
3) 42.2 in 1916
4) 41.4 in 2001
5) 41.0 in 1967
6) 37.8 in 2013
7) 35.5 in 1993

Today’s Observations:

7 A.M.
Weather: Very light snow, overcast stratus, few
stratus fractus SSW-NNW
Temperature: 31F; Dew Point: 30F; Wind: NNE at 11G20 kts
Sea-level pressure: 30.35 ins. Hg, rising unsteadily
Visibility: 35 miles, distant fog in all directions
6-hr Max temp: 32F
6-hr Min temp: 30F
24-hr precip:  0.18 ins.
24-hr snowfall: 1.8 ins.
Snow depth: 10 ins.
BHO SA 1155 E35 OVC 35S- 277/31/30/0211G20/035/ NEW SNW PST
24 HRS 1.8 INS FEW STFRA SSW-NNW PCPN VRY LGT DSNT FG ALQDS/
8/6// 4/010 52032 MANUAL 70018 ASOS 70018 10032 20030

10 A.M.
Weather: Very light snow, broken stratus fractus,
broken stratocumulus, overcast stratus
Temperature: 32F; Dew Point: 29F; Wind: NNE at 8G23 kts
Sea-level pressure: 30.44 ins. Hg, rising steadily
Visibility: 70 miles
3-hr precip: Trace
3-hr snowfall: Trace
BHO SA 1455 E22 BKN E30 BKN E35 OVC 70S- 307/32/29/0208G23/044/
NEW SNW PST 3 HRS TRACE PCPN VRY LGT/ 8/6// 52030 MANUAL 600//

1 P.M.
Weather: Light snow, scattered stratus fractus, overcast
stratus, virga in all directions, sun dimly visible
Temperature: 33F; Dew Point: 28F; Wind: NNE at 13G25 kts,
Peak wind: 27 kts (31 MPH) at 12:22 P.M.
Sea-level pressure: 30.47 ins. Hg, rising steadily
Visibility: 35 miles, distant fog in all directions
6-hr Max temp: 34F
6-hr Min temp: 30F
6-hr precip: Trace
6-hr snowfall: Trace
Snow depth: 10 ins.
BHO SA 1755 35 SCT E42 OVC 35S- 320/33/28/0313G25/047/ NEW SNW PST
3 HRS TRACE VIRGA ALQDS SUN DMLY VSBL DSNT FG ALQDS PK WND 0330/22
8/6// 4/010 52013 MANUAL 600// 10034 20030

SUMMARY FOR SATURDAY, MARCH 24, 2018

TEMPERATURE (DEGREES F)
MAX…..45   NORMAL…..47
MIN…..32   NORMAL…..29
MEAN….39   NORMAL…..38

DEPARTURE FROM 30-YEAR NORMAL……………………….+1
TOTAL DEPARTURE FOR THE MONTH………………………-35 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….26   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH…………776   DEPARTURE………+40
TOTAL HEATING UNITS FOR THE SEASON……….4898   DEPARTURE……..-406
TOTAL HEATING UNITS LAST SEASON TO DATE…..4711   DIFFERENCE…….+187

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 NE AT 2:23 P.M.
AERO……………………21 NE AT 2:21 P.M.
ASOS……………………22 NE AT 2:23 P.M.
DAVIS…………………..21 M  AT 2:23 P.M ** RMY N/A
FASTEST MILE FOR YESTERDAY…………………13 NE AT 2:23 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 NE AT 2:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 M  AT 2:24 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..7.7 NNW
ASOS…………………..8.0
DAVIS………………….7.1
* Last of multiple occurrences
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.18  DEPARTURE……-0.01
ASOS…………..0.18
TOTAL PRECIPITATION FOR THE MONTH……….8.60  DEPARTURE……+4.48
ASOS…………..9.32
TOTAL PRECIPITATION FOR THE YEAR……….18.71  DEPARTURE……+6.17
ASOS………….20.17

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..+1.5
TOTAL SNOWFALL FOR THE MONTH……………45.5  DEPARTURE…….+34.8
TOTAL SNOWFALL FOR THE SEASON…………..90.2  DEPARTURE…….+32.4

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

3/01 61/37/49/+18/0.00/0.0/378/56    39 ENE AERO 37 ENE RMY N/A
3/02 40/32/36/+5/3.47/0.7/000/00     73 NNE AERO 70 NNE RMY N/A
3/03 40/32/26/+4/T/T/034/05          52 NNE AERO 50 NNE RMY 49
3/04 39/34/37/+5/T/T/000/00          36 NNE AERO 32 NNE RMY 32
3/05 40/29/35/+3/…/1.2/261/38      40 NE  AERO 39 NE  RMY 40
3/06 34/29/32/0/0.00/0.0/062/09      20 N   AERO 16 N   RMY N/A
3/07 35/31/33/0/…./…/000/00      52 ENE AERO 53 ENE RMY 50
3/08 34/28/31/-2/…./…/000/00     44 NNE AERO 47 NNE RMY N/A
3/09 36/24/30/-3/T/T/265/38          28 W   AERO 26 W   RMY N/A
3/10 37/28/33/0/0.00/0.0/343/49      38 WNW AERO 38 WNW RMY 41
3/11 42/26/34/0/0.00/0.0/583/83      28 NW  AERO 26 NW  RMY 29
3/12 39/26/33/-1/T/T/155/22          36 ENE AERO 33 ENE RMY N/A
3/13 35/26/31/-3/…./23.0/000/00    60 N   AERO 60 N   RMY 64
3/14 36/24/30/-5/…./…/470/66     38 WSW AERO 38 WSW RMY 41
3/15 40/29/35/0/…./…/…/..      44 W   AERO 44 W   RMY 44
3/16 35/23/29/-6/0.00/0.0/…/..     41 NW  AERO 41 NW  RMY 45
3/17 40/15/28/-8/0.00/0.0/…/…    46 W   AERO 45 W   RMY 49
3/18 31/10/21/-15/0.00/0.0/…/..    39 NW  AERO 38 NW  RMY 40
3/19 35/13/24/-12/0.00/0.0/…/..    32 WNW AERO 32 WNW RMY 34
3/20 40/18/29/-8/0.00/0.0/…/..     23 NW  AERO 21 NW  RMY N/A
3/21 35/31/33/-4/…./…/000/00     43 NE  AERO 44 NE  RMY N/A
3/22 39/30/35/-2/…./…/000/00     28 NNW AERO 26 NNW RMY 30
3/23 44/28/36/-2/…./…/…/..     21 NNW AERO 18 NNW RMY 21
3/24 45/32/39/+1/T/T/…/..          23 NE  AERO 21 NE  RMY N/A

3/25 Low temp since midnight is 30F; normal low is now 30F

DAILY RECORDS FOR MARCH 2018

3/02/18: NEW DAILY RECORD MAXIMUM PRECIPITATION OF 3.47 INS.
PREVIOUS RECORD WAS 2.15 INS. SET IN 1983

3/13/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 23.0 INS.
PREVIOUS RECORD WAS 10.0 INS. SET IN 1993

3/13/18: NEW MONTHLY RECORD MAXIMUM DAILY SNOWFALL OF 23.0 INS.
PREVIOUS RECORD WAS 18.0 INS. SET ON 8 MARCH 2013

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

RECORDS FOR MARCH 25
HIGH 76 IN 1910
LOW 8 IN 1888, 1956
PRECIP 1.84 INS. IN 1909
SNOWFALL 1.0 INS. IN 1912
PEAK GUST 69 MPH SE IN 1969

RECORDS FOR MARCH 26
HIGH 76 IN 1922, 1949
LOW 6 IN 1960
PRECIP 1.99 INS. IN 1988
SNOWFALL 5.4 INS. IN 2001
PEAK GUST 63 MPH S IN 1970

TODAY’S REPORT PREPARED BY: Kaitlin Geagan