Sunday, March 11, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MARCH 11, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLEAR SKIES AS TEMPS WARM UP AFTER A CHILLY
START

Mostly clear skies have seen a few low clouds drift
over the summit this morning.  Winds continue to be
strong today, gusting to around 30 miles per hour.
Temperatures have been close to or slightly
below seasonable with a high yesterday of 37F.
Our low yesterday was a seasonable 26F.

The humidity dropped between the 7 and 10 AM
observations and visibility has increased throughout
the morning.  No precipitation occurred yesterday and
none is expected today.

Today’s Observations:

7 A.M.
Weather: Few stratocumulus NW-N, Few Altostratus NNW-E
Temperature: 29F; Dew Point: 22F; Wind: WNW at 10G18 kts
Sea-level pressure: 29.94 ins. Hg, rising, then more slowly
Visibility: 55 miles
6-hr Max temp: 29F
6-hr Min temp: 26F
24-hr precip:  0.00
24-hr snowfall: 0.0
Snow depth: 9 ins.
BHO SA 1155 CLR 55 139/29/22/3010G18/994/ FEW SC NW-N FEW AS NNW-E
LGT DSNT HZ/ 8/870 4/008 51016 10029 20026

10 A.M.
Weather: Few Cumulus, few Altostratus NW-E
Temperature: 37F; Dew Point: 24F; Wind: WNW at 16G23 kts,
Sea-level pressure: 29.96 ins. Hg, rising steadily
Visibility: 70 miles
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 CLR 70 146/37/24/3116G23/996/ FEW CU ALQDS FEW AS NW-E/
8/110 52007

1 P.M.
Weather: Scattered Cumulus, Few Cirrostratus
Temperature: 40F; Dew Point: 22F; Wind: NW at 8 kts,
Sea-level pressure: 29.96 ins. Hg, steady
Visibility: 70 miles
6-hr Max temp: 41F
6-hr Min temp: 29F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 7 ins.
BHO SA 1755 48 SCT 70 146/40/22/3208/996/ FEW CS N-E/ 8/108 4/007
50000 10041 20029

SUMMARY FOR SATURDAY, MARCH 10, 2018

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..42
MIN…..28   NORMAL…..24
MEAN….33   NORMAL…..33

DEPARTURE FROM 30-YEAR NORMAL……………………….0
TOTAL DEPARTURE FOR THE MONTH………………………+30 [+3.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….32   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH…………298   DEPARTURE………-29
TOTAL HEATING UNITS FOR THE SEASON……….4420   DEPARTURE……..-475
TOTAL HEATING UNITS LAST SEASON TO DATE…..4190   DIFFERENCE…….+230

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….38 WNW AT  12:38 P.M.*
AERO……………………38 WNW AT  12:38 P.M.
ASOS……………………37 WNW AT  12:40 P.M.
DAVIS…………………..38 M   AT  12:40 P.M ** RMY 41
FASTEST MILE FOR YESTERDAY…………………27 WNW AT  12:40 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………28 W   AT  12:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..26 M   AT  12:40 P.M.**
AVERAGE WIND SPEED AND DIRECTION………….17.4 W
ASOS………………….17.3
DAVIS…………………15.1 **
* Last of multiple occurrences
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.18
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….5.76  DEPARTURE……+4.19
ASOS…………..6.32
TOTAL PRECIPITATION FOR THE YEAR……….15.87  DEPARTURE……+5.88
ASOS………….17.17

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH……………16.9  DEPARTURE…….+11.8
TOTAL SNOWFALL FOR THE SEASON…………..61.6  DEPARTURE……..+9.4

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 36/24/30/-3/T/T/…/..          28 W   AERO 26 W   RMY N/A
3/10 37/28/33/0/0.00/0.0/…/..      38 WNW AERO 38 WNW RMY 41

3/11 Low temp since midnight is 26F; normal low is now 25F

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 11
HIGH 65 IN 1967
LOW 4 IN 1939, 1960
PRECIP 2.11 INS. IN 1901
SNOWFALL 6.3 INS. IN 1934
PEAK GUST 66e MPH W IN 1980

RECORDS FOR MARCH 12
HIGH 72 IN 2012
LOW 2 IN 1885
PRECIP 2.87 INS. IN 1888
SNOWFALL 9.7 INS. IN 1959
PEAK GUST 66 MPH SE IN 1962

TODAY’S REPORT PREPARED BY: Robert Millette