Sunday, April 13, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 13, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

SHOWERS BRING LIGHT RAIN THIS MORNING AS WARM FRONT MOVES THROUGH

A warm front has been moving through the region during the day, setting the
stage for some expected well above normal warmth tomorrow.  Light rain showers
moved into the area during the mid-morning hours, providing only 0.04 inches
of rain here at the summit.  Temperatures, which had risen to 50F before the
rain began, fell back to 45F as the showers moved through.  They then began
to rise slowly again, and by 2PM EDT we had reached a high of 60F, though that
will likely continue to rise.  With warm air moving in behind the warm front,
it is possible that we will approach our record high for tomorrow of 80F set
in 1945.  The sky has remained mostly cloudy into the afternoon, with just a
few breaks of sunshine observed.  The wind came out of the south this morning
but shifted to the north as the rain showers moved in.  It has gradually
shifted from north to east and now south again as the day has gone on, with
speeds mostly under 20mph, though a few gusts have reached 25mph during the
early afternoon.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, overcast altocumulus, few breaks in overcast
overhead
Temperature: 48F; Dew Point: 35F; Wind: S at 11 kts
Sea-level pressure: 30.24 ins. Hg, falling slightly
Visibility: 60 miles, except 45 miles W-NNW, distant haze
6-hr max temp: 52F
6-hr min temp: 46F
BHO SA 1155 E90 BKN 120 OVC 60 239/48/35/1711/024/ FEW BINOVC OVHD DSNT HZ
VSBY W-NNW 45/ 8/05/ 57002 10052 20046

10 A.M.
Weather: Very light rain, broken nimbostratus, overcast altocumulus, light
rain began at 9:13 A.M.
Temperature: 46F; Dew Point: 41F; Wind: ENE at 8 kts
Sea-level pressure: 30.25 ins. Hg, rising slightly
Visibility: 50 miles, except 30 miles WNW-NNW, 20 miles N-ENE
3-hr precip: 0.02 inches
BHO SA 1455 E55 BKN 80 OVC 50RW- 244/46/41/0708/025/ PCPN VRY LGT VSBY
WNW-NNW 30 N-ENE 20 R-B13/ 8/02/ 53005 MANUAL 60002 ASOS 60001

1 P.M.
Weather: Overcast stratocumulus
Temperature: 60F; Dew Point: 28F; Wind: S at 15G24 kts
Sea-level pressure: 30.17 ins. Hg, falling then falling more slowly
Visibility: 45 miles, distant haze
6-hr max temp: 60F
6-hr min temp: 45F
6-hr precip: 0.04 inches
BHO SA 1755 E50 OVC 45 218/60/28/1815G24/017/ DSNT HZ/ 8/5// 56026 MANUAL
60004 ASOS 60003 10060 20045

WEATHER SUMMARY FOR SATURDAY, APRIL 12, 2014

TEMPERATURE (DEGREES F)
MAX…..68    NORMAL…..54
MIN…..44    NORMAL…..36
MEAN….56    NORMAL…..45

DEPARTURE FROM 30-YEAR NORMAL……………………+11
TOTAL DEPARTURE FOR THE MONTH……………………+51 [+4.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………9  DEPARTURE………-11
TOTAL HEATING UNITS FOR THE MONTH………….211  DEPARTURE………-51
TOTAL HEATING UNITS FOR THE SEASON………..5838  DEPARTURE………+92
TOTAL HEATING UNITS LAST SEASON TO DATE……5265  DIFFERENCE…….+573

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………28  W    AT  1:06 P.M. *
AERO…………………..N/A
ASOS…………………..29  W    AT  1:05 P.M.
DAVIS………………….26  WSW  AT  1:04 P.M.  RMY 28
FASTEST MILE FOR YESTERDAY………………..20  W    AT  1:05 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..22  W    AT  1:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….19  W    AT  1:06 P.M.
AVERAGE WIND SPEED AND DIRECTION………….9.8  NW
ASOS…………………10.1
DAVIS…………………8.4  W [283 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……….1.17  DEPARTURE………….-0.87
ASOS…………..1.16
TOTAL PRECIPITATION FOR THE YEAR……….16.29  DEPARTURE………….+0.25
ASOS………….16.70

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…………..-1.9
TOTAL SNOWFALL FOR THE SEASON…………..84.8  DEPARTURE………….+23.2

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/-1/0.31/0.0/255/33          26 ESE AERO N/A        RMY 25
4/5  51/33/42/-1/0.19/0.0/186/24          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/+9/0.05/0.0/187/24          28 SSE AERO N/A        RMY N/A
4/8  62/41/52/+8/0.61/0.0/016/02          45 W   AERO N/A        RMY 44
4/9  60/36/48/+4/0.00/0.0/707/90          35 NW  AERO N/A        RMY 36
4/10 57/33/45/0/0.00/0.0/742/94           38 S   AERO N/A        RMY 39
4/11 70/45/58/+13/T/0.0/…/..            32 S   AERO N/A        RMY N/A
4/12 68/44/56/+11/0.00/0.0/…/..         28 W   AERO N/A        RMY 28

4/13 morning low temp: 45F; the normal low is now 37F

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 13
HIGH 85 IN 1945
LOW 22 IN 1939
PRECIP 2.51 IN. IN 2004
SNOWFALL 6.8 IN. IN 1933
PEAK GUST 59 MPH SSW IN 1995

RECORDS FOR APRIL 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 2.22 IN. IN 1895
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943

TODAY’S REPORT PREPARED BY: Jonathan O’Brien