Friday, March 9, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MARCH 9, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDS INCREASE FROM PARTLY SUNNY TO OVERCAST
WITH A FEW PASSING SNOW SHOWERS…

The Nor’easter which spanned Wednesday night into
Thursday morning left 15 inches of snow on top of
Great Blue Hill. Today skies started partly cloudy
but clouds began to increase before the 10:00 A.M.
observation. Skies remained overcast with a few
breaks for the rest of the day. With the increase
cloud cover we also had a couple quick moving
snow showers pass over, which only left a trace
of snowfall by 1:00 P.M.
Winds from the West have been lighter and we
have observed cooler temperatures today. The low
since midnight has been a seasonable 24F, but
our high so far today of 32F is 10 degrees below
the daily normal of 42F. We had humidity in the
70’s today which made for a lingering distant fog.
We had a maximum of 60 miles for visibility in
the morning before the cloud increase and the snow
showers.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrostratus,
few cumulus in all directions
Temperature: 25F; Dew Point: 19F; Wind: WSW at 8 kts
Sea-level pressure: 29.63 ins. Hg, rising steadily
Visibility: 60 miles, except 30 WSW-WNW due to distant fog
6-hr Max temp: 28F
6-hr Min temp: 24F
24-hr precip:  0.09 ins.
24-hr snowfall: 1.2 ins.
Snow depth: 10 ins.
BHO SA 1155 85 SCT 250 SCT 60 033/25/19/2508/963/ NEW SNW
PST 24 HRS 1.2 INS. STORM TOTAL 15.0 INS FEW CU ALQDS VSBY
30 WSW-WNW DSNT FG WSW-WNW/ 8/196 4/010 52007 MANUAL 70009
ASOS 70011 10028 20024

10 A.M.
Weather: Very light snow, broken stratocumulus,
broken altostratus
Temperature: 30F; Dew Point: 22F; Wind: WSW at 12G19 kts
Sea-level pressure: 29.63 ins. Hg, rising then steady
Visibility: 60 miles, except 30 SSE-NNW due to distant fog
3-hr precip: Trace
3-hr snowfall: Trace
BHO SA 1455 E30 BKN 80 BKN 60S- 033/30/22/2512G19/963/ NEW SNW
PST 3 HRS TRACE VSBY 30 SSE-NNW DSNT FG SSE-NNW PCPN VRY LGT/
8/510 54000 MANUAL 600//

1 P.M.
Weather: Broken stratocumulus, overcast stratus
Temperature: 31F; Dew Point: 24F; Wind: W at 9G18 kts
Sea-level pressure: 29.62 ins. Hg, falling, then more slowly
Visibility: 40 miles
6-hr Max temp: 32F
6-hr Min temp: 25F
6-hr precip: Trace
6-hr snowfall: Trace
Snow depth: 10 in.
BHO SA 1755 E34 BKN E42 OVC 40 030/31/24/2709G18/962/
NEW SNW PST 6 HRS TRACE DSNT FG ALQDS/ 8/6// 4/101 57003
MANUAL 600// 10032 20025

SUMMARY FOR THURSDAY, MARCH 8, 2018

TEMPERATURE (DEGREES F)
MAX…..34   NORMAL…..42
MIN…..28   NORMAL…..24
MEAN….31   NORMAL…..33

DEPARTURE FROM 30-YEAR NORMAL……………………….-2
TOTAL DEPARTURE FOR THE MONTH………………………+33 [+3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….34   DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE MONTH…………231   DEPARTURE………-33
TOTAL HEATING UNITS FOR THE SEASON……….4353   DEPARTURE……..-479
TOTAL HEATING UNITS LAST SEASON TO DATE…..4130   DIFFERENCE…….+223

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….44 NNE AT 1:37 A.M.
AERO……………………47 NNE AT 1:10 A.M.
ASOS……………………49 N   AT 1:13 A.M.
DAVIS…………………..44 M   AT 1:12 A.M ** RMY N/A
FASTEST MILE FOR YESTERDAY…………………33 NNE AT 1:19 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………33 NNE AT 1:42 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..33 M   AT 1:19 A.M.**
AVERAGE WIND SPEED AND DIRECTION………….14.5 NW
ASOS………………….14.9
DAVIS…………………13.1 **
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.09  DEPARTURE……-0.09
ASOS…………..0.11
TOTAL PRECIPITATION FOR THE MONTH……….5.76  DEPARTURE……+4.55
ASOS…………..6.32
TOTAL PRECIPITATION FOR THE YEAR……….15.87  DEPARTURE……+6.24
ASOS………….17.17

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….1.2  DEPARTURE……..+0.7
TOTAL SNOWFALL FOR THE MONTH……………16.9  DEPARTURE…….+12.8
TOTAL SNOWFALL FOR THE SEASON…………..61.6  DEPARTURE…….+10.4

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

2/1  45/27/36/+10/0.06/0.0/120/20      36 SSW AERO 35 SSW RMY N/A
2/2  34/08/21/-5/0.25/2.5/223/37       43 WNW AERO 46 WNW RMY 46
2/3  25/04/15/-11/0.00/0.0/557/92      26 S   AERO 24 S   RMY 30
2/4  45/23/34/+8/0.32/T/000/00          31 SSE AERO 29 S   RMY 30
2/5  46/19/33/+7/0.36/0.0/464/76       47 WNW AERO 47 WNW RMY 44
2/6  31/17/24/+2/T/T/025/04            26 SSW AERO 23 SSW RMY 23
2/7  42/21/32/+5/0.62/1.1/000/00       45 SW  AERO 46 SW  RMY 47
2/8  30/20/25/-2/0.00/0.0/501/81       38 WNW AERO 38 WNW RMY N/A
2/9  30/16/23/-4/0.00/0.0/384/62       28 S   AERO 25 S   RMY N/A
2/10 51/28/40/+13/0.20/0.0/000/00      31 S   AERO 30 S   RMY 31
2/11 46/36/41/+14/0.70/0.0/000/00      24 SW  AERO 21 SW  RMY N/A
2/12 53/27/40/+13/0.00/0.0/132/21      33 WNW AERO 33 WNW RMY N/A
2/13 31/21/26/-2/0.00/0.0/496/79       22 S   AERO 18 WNW RMY 21
2/14 46/25/36/+8/0.00/0.0/234/37       30 S   AERO 26 SSW RMY 29
2/15 47/35/41/+13/0.02/0.0/000/00      23 SSW AERO 20 SSW RMY N/A
2/16 50/31/41/+13/0.02/0.0/000/00      45 W   AERO 44 W   RMY 42
2/17 38/23/31/+3/0.21/2.0/468/73       33 SSW AERO 29 SSE RMY 33
2/18 42/29/35/+6/0.39/3.8/451/70       32 WNW AERO 29 WNW RMY 34
2/19 48/30/39/+10/0.09/0.0/518/80      39 SSW AERO 37 SSW RMY 40
2/20 68/48/58/+29/0.01/0.0/461/71      32 SSW AERO 30 SSW RMY N/A
2/21 70/50/60/+31/0.00/0.0/456/70      32 SW  AERO 30 SW  RMY 33
2/22 53/30/42/+13/0.10/0.8/000/00      30 N   AERO 28 N   RMY N/A
2/23 41/28/35/+5/0.20/0.0/217/33       34 SW  AERO 20 SW  RMY N/A
2/24 54/35/45/+15/T/0.0/297/45         32 W   AERO 30 W   RMY 29
2/25 39/33/36/+6/0.56/T/000/00         33 ESE AERO 30 ESE RMY 33
2/26 48/35/42/+12/0.00/0.0/213/32      29 WNW AERO 25 WNW RMY 28
2/27 51/29/40/+9/0.00/0.0/669/100      26 WNW AERO 23 WNW RMY 25
2/28 59/37/48/+17/0.01/0.0/571/85      28 SSW AERO 25 SSW RMY 27

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/…/..    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/…/..          52 NNE AERO 50 NNE RMY 49
3/04 39//34/37/+5/T/T/…/..         36 NNE AERO 32 NNE RMY 32
3/05 40/29/35/+3/…/1.2/…/..      40 NE  AERO 39 NE  RMY 40
3/06 34/29/32/0/0.00/0.0/…/..      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/…./…/…/..     44 NNE AERO 47 NNE RMY N/A

3/09 Low temp since midnight is 24F; normal low is now 24F

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

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

RECORDS FOR MARCH 9
HIGH 75 IN 2016
LOW 1 IN 2007
PRECIP 2.67 INS. IN 1998
SNOWFALL 6.3 INS. IN 2013
PEAK GUST 102e MPH S IN 1942 [RECORD FOR MONTH]

RECORDS FOR MARCH 10
HIGH 69 IN 1977
LOW 2 IN 1984
PRECIP 2.00 INS. IN 1994
SNOWFALL 4.0 INS. IN 1997
PEAK GUST 80 MPH NW IN 1974

TODAY’S REPORT PREPARED BY: Kaitlin Geagan