Monday, March 26, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MARCH 26, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE BRINGS CLEAR SKIES, MODERATE WIND,
AND COOL TEMPERATURES…

We observed a steady rise in atmospheric pressure
until around 10:00 A.M. with an approximate max sea
level pressure of 30.73 ins. Hg. This high pressure
caused clear skies and a strong northeasterly wind.
We have observed frequent gust over 26 kts (30 MPH)
since 7:00 A.M and a peak gust of 29 kts (33 MPH)
by 1:00 P.M. The moderate to strong wind gusts made
temperatures feel cooler with a windchill this morning
in the teens and twenties. Since midnight we observed
a low of 27F, which is 3 degrees below the normal of
30F. So far today we observed a max temperature of 38F,
which is 10 degrees below the daily normal of 48F.
Skies remained sunny today for the first time in almost
a week. We had scattered cumulus clouds at the 10:00 A.M
observation which cleared by 1:00 P.M. We also observed
a drop in relative humidity and had and increase of
visibility from 70 to 80 miles by 1:00 P.M.

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

1) 52.0 in 1956
2) 45.5 in 2018 (through 3/25)
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: Clear, few cumulus NNW-SSW, thin smoke layer
in all directions
Temperature: 31F; Dew Point: 22F; Wind: NNE at 8G18 kts
Sea-level pressure: 30.70 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 31F
6-hr Min temp: 27F
24-hr precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 10 ins.
BHO SA 1155 CLR 70 395/31/22/0208G18/070/ NEW SNW PST 24 HRS
TRACE FEW CU NNW-SSW THN K LYR ALQDS/ 8/100 4/010 53023 10031
20027

10 A.M.
Weather: Scattered cumulus
Temperature: 35F; Dew Point: 19F; Wind: NE at 13G26 kts,
Peak wind: 26 kts (30 MPH) NE at 9:54 A.M.
Sea-level pressure: 30.73 ins. Hg, rising steadily
Visibility: 70 miles
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 36 SCT 70 408/35/19/0513G26/073/ PK WND 0526/54/
8/100 52013

1 P.M.
Weather: Clear, few cumulus N-W
Temperature: 37F; Dew Point: 28F; Wind: NNE at 13G22 kts,
Peak wind: 26 kts (30 MPH) at 12:18 P.M.
Sea-level pressure: 30.73 ins. Hg, steady
Visibility: 80 miles
6-hr Max temp: 38F
6-hr Min temp: 32F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 8 ins.
BHO SA 1755 CLR 80 408/37/19/0513G22/073/ FEW CU N-W
PK WND 0526/18/ 8/100 4/008 50000 10038 20032

SUMMARY FOR SUNDAY, MARCH 25, 2018

TEMPERATURE (DEGREES F)
MAX…..36   NORMAL…..47
MIN…..29   NORMAL…..30
MEAN….33   NORMAL…..38

DEPARTURE FROM 30-YEAR NORMAL……………………….-5
TOTAL DEPARTURE FOR THE MONTH………………………-40 [-1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….32   DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE MONTH…………808   DEPARTURE………+45
TOTAL HEATING UNITS FOR THE SEASON……….4930   DEPARTURE……..-401
TOTAL HEATING UNITS LAST SEASON TO DATE…..4738   DIFFERENCE…….+192

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….35 NNE AT  2:32 P.M.
AERO……………………30 NNE AT  2:32 P.M.
ASOS……………………34 NNE AT  2:33 P.M.
DAVIS…………………..29 M   AT 10:20 A.M ** RMY 33
FASTEST MILE FOR YESTERDAY…………………23 NE  AT  3:29 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 NE  AT  3:12 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 M   AT  3:29 P.M.**
AVERAGE WIND SPEED AND DIRECTION………….11.5 NNE
ASOS………………….11.5
DAVIS…………………10.6
** Davis direction malfunctioning and reading low/missed peak gust

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.19
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….8.60  DEPARTURE……+4.29
ASOS…………..9.32
TOTAL PRECIPITATION FOR THE YEAR……….18.71  DEPARTURE……+5.98
ASOS………….20.17

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.3
TOTAL SNOWFALL FOR THE MONTH……………45.5  DEPARTURE…….+34.5
TOTAL SNOWFALL FOR THE SEASON…………..90.2  DEPARTURE…….+32.1

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

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 36/29/33/-5/0.18/1.8/…/..     35 NNE AERO 30 NNE RMY 33

3/26 Low temp since midnight is 27F; 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 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

RECORDS FOR MARCH 27
HIGH 78 IN 1998
LOW 12 IN 1975
PRECIP 1.05 INS. IN 1913
SNOWFALL 6.6 INS. IN 1959
PEAK GUST 62 MPH NW IN 1965, SE IN 1992

TODAY’S REPORT PREPARED BY: Kaitlin Geagan