Thursday, April 10, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 10, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

A CLEAR AND DRY DAY ATOP GREAT BLUE HILL

Following a shift in the winds overnight from NW to SW clouds
have generally been decreasing with humidity staying below 50%
for most of the morning. Visibilities of 70 to 80 miles have
generally been observed throughout the day with only a few
cirrus fibratus forming and dissipating mostly to our north.

By 1:00 PM EST cirrus fibratus were generally forming and present
in all directions with a few cirrocumulus distant to the NW.
Winds were on the increase and sustained at 20 gusting to
28 knots at 12:52 PM EST.

Today’s Observations:

7 A.M.
Weather: Clear, few cirrus distant NNE and ENE
Temperature: 39F; Dew Point: 32F; Wind: SW at 8 kts,
Sea-level pressure: 30.13 ins. Hg, rising, then more slowly
Visibility: 80 miles, 70 miles S-NW, light distant haze
6-hr max temp: 39F
6-hr min temp: 33F
BHO SA 1155 CLR 80 203/39/32/2208/013/ FEW CI DSNT NNE AND ENE
LGT DSNT HZ S-NW VSBY S-NW 70 MI/ 8/001 51029 10039 20033

10 A.M.
Weather: Clear, few cirrus fibratus overhead and W-ENE
Temperature: 52F; Dew Point: 20F; Wind: SW at 10G20 kts,
Sea-level pressure: 30.14 ins. Hg, rising, then falling but higher
Visibility: 80 miles, 70 miles W-NNE, light distant haze
BHO SA 1455 CLR 80 205/52/20/2210G20/014/ FEW CI OHD AND W-ENE
LGT HZ DSNT W-NNE VSBY W-NNE 70 MI/ 8/001 50002

1 P.M.
Weather: Clear, few cirrocumulus distant NW, few cirrus fibratus
in all quadrants
Temperature: 55F; Dew Point: 21F; Wind: S at 20G28 kts,
Peak Wind: 28 kts S @ 12:52 P.M. EST
Sea-level pressure: 30.09 ins. Hg, falling, then more slowly
Visibility: 70 miles, light distant haze
6-hr max temp: 57F
6-hr min temp: 39F
BHO SA 1755 CLR 70 189/55/21/1820G28/009/ FEW CC DSNT NW FEW CI ALQDS
LGT DSNT HZ ALQDS PK WND 1828/52/ 8/001 56016 10057 20039

WEATHER SUMMARY FOR WEDNESDAY, APRIL 9, 2014

TEMPERATURE (DEGREES F)
MAX…..60    NORMAL…..53
MIN…..36    NORMAL…..35
MEAN….48    NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL…………………….+4
TOTAL DEPARTURE FOR THE MONTH……………………+27 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17  DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH………….175  DEPARTURE………-27
TOTAL HEATING UNITS FOR THE SEASON………..5802  DEPARTURE……..+117
TOTAL HEATING UNITS LAST SEASON TO DATE……5207  DIFFERENCE…….+595

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………35  NW   AT   4:24 P.M.
AERO…………………..N/A
ASOS…………………..36  NW   AT   4:26 P.M.
DAVIS………………….33  NW   AT   4:25 P.M. RMY 36
FASTEST MILE FOR YESTERDAY………………..26  NW   AT   4:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..25  NW   AT   5:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….24  NW   AT   4:26 P.M.
AVERAGE WIND SPEED AND DIRECTION…………13.8  WNW
ASOS…………………12.8
DAVIS………………..12.0  NW [305 deg] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE………….-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.16  DEPARTURE………….-0.36
ASOS…………..1.15
TOTAL PRECIPITATION FOR THE YEAR……….16.28  DEPARTURE………….+0.76
ASOS………….16.69

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…………..-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…………..-1.5
TOTAL SNOWFALL FOR THE SEASON…………..84.8  DEPARTURE………….+23.6

PRELIMINARY CLIMATE SUMMARY FOR APRIL 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO 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

4/1  48/31/40/-1/0.00/0.0/694/91          29 NNE AERO N/A        RMY N/A
4/2  56/34/45/+4/0.00/0.0/452/69          22 WSW AERO 20 MPH WSW RMY N/A
4/3  55/36/46/+4/0.00/0.0/707/92          23 NNW AERO 22 MPH NW  RMY 25
4/4  47/35/41/-1/…/0.0/255/33           26 ESE AERO N/A        RMY 25
4/5  51/33/42/-1/…/0.0/186/24           39 WNW AERO N/A        RMY 40
4/6  58/29/44/+1/0.00/0.0/755/97          25 W   AERO N/A        RMY N/A
4/7  59/44/52/+9/…./…/…/..          28 SSE AERO N/A        RMY N/A
4/8  62/41/52/+8/…./…/…/..          45 W   AERO N/A        RMY 44
4/9  60/36/48/+4/0.00/0.0/…/..          35 NW  AERO N/A        RMY 36

4/10  morning low temp: 33F; the normal low is now 36F

DAILY RECORDS FOR APRIL 2014
None so far.

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 78 IN 1945
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: Brian Fitzgerald