Sunday, April 23, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 23, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY SKIES AND WARM CONDITIONS RETURN TODAY

Partly cloudy skies started this morning with distant altostratus
and cirrus towards the south and east.  A total of 0.06 inches of
precipitation was measured for the 24 hours ending at 7 AM EST
The temperature has quickly surpassed yesterday’s high temperature
and continues to rise quickly from this morning’s low of 37.

By 1 PM, The temperature had reached 59 degrees with lights winds
and dry conditions. Humidity levels had dropped from the mid 80s
this morning down into the lower 40s.

Today’s Observations:

7 A.M.
Weather: Scattered Altocumulus E-SW, Few Cirrus SE-SW
Temperature: 43F; Dew Point: 39F; Wind: NNW at 07 kts,
Sea-level pressure: 30.07 ins. Hg, steady then increasing
Visibility: 80 miles
6-hr Max temp: 43F
6-hr Min temp: 37F
24-hr precip: 0.06 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 10 SCT 80 182/43/39/3407/007/ FEW CU SE-SW/ 8/012
53025 70006 10043 20037

10 A.M.
Weather: Few Cumulus all quadrants, Few Cirrus ESE-WSW
Temperature: 42F; Dew Point: 42F; Wind: N at 05 kts,
Wind: Light
Sea-level pressure: 30.09 ins. Hg, rising, then more slowly
Visibility: 80 miles
BHO SA 1455 CLR 80 191/53/39/0705/009/ FEW CU ALQDS FEW CI
ESE-WSW WND LGT/ 8/102 51009

1 P.M.
Weather: Few cumulus S, Few Cirrostratus SE-SW
Temperature: F; Dew Point: F; Wind: VRB at  kts
Wind: Light
Sea-level pressure: 30.07 ins. Hg, falling, then more quickly
Visibility: 75 miles
6-hr Max temp: 59F
6-hr Min temp: 43F
6-hr precip: 0.00 inches
BHO SA 1755 CLR 75 184/59/37/2105/007/ FEW CU S FEW CI SE-SW
WND LGT/ 8/105 57007 10059 20043

SUMMARY FOR SATURDAY, APRIL 22, 2017

TEMPERATURE (DEGREES F)
MAX…..44   NORMAL…..58
MIN…..40   NORMAL…..40
MEAN….42   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL…………………….-7
TOTAL DEPARTURE FOR THE MONTH……………………+87 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..23   DEPARTURE……….+7
TOTAL HEATING UNITS FOR THE MONTH………….358   DEPARTURE………-79
TOTAL HEATING UNITS FOR THE SEASON………..5260   DEPARTURE……..-661
TOTAL HEATING UNITS LAST SEASON TO DATE……4864   DIFFERENCE…….+396

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22 NNE AT  8:17 A.M. *
AERO……………………22 NNE AT  8:13 A.M.
ASOS……………………24 NNE AT  6:39 A.M.
DAVIS…………………..20 NNE AT  4:53 A.M. RMY 20
FASTEST MILE FOR YESTERDAY…………………13 NNE AT  8:13 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 NNE AT  7:07 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 NNE AT  1:44 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.3 NNE
ASOS…………………..8.4
DAVIS………………….7.0 NE [35 deg.] * LAST OF MULTIPLE OCCURRENCES

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.06  DEPARTURE……-0.08
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE MONTH……….5.03  DEPARTURE……+1.55
ASOS…………..5.08
TOTAL PRECIPITATION FOR THE YEAR……….19.15  DEPARTURE……+1.67
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….2.7  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE SEASON…………..66.4  DEPARTURE…….+3.9

PRELIMINARY CLIMATE SUMMARY FOR APRIL 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

4/1  35/31/33/-8/2.21/2.7/000/00           40 ENE AERO 41 ENE RMY 41
4/2  53/30/42/+1/0.00/0.0/552/72           32 NW  AERO 33 NW  RMY 34
4/3  60/35/48/+6/0.00/0.0/685/89           21 W*  AERO 20 NW  RMY N/A
4/4  42/35/39/-3/0.78/0.0/000/00           41 ESE AERO 43 ESE RMY 42
4/5  41/35/38/-5/0.00/0.0/000/00           21 NNW AERO 20 NNW RMY N/A
4/6  55/35/45/+2/1.27/0.0/000/00           35 SSE AERO 37 S   RMY 37  TSTM
4/7  53/38/46/+3/0.00/0.0/226/29           43 SSW AERO 47 SSW RMY 48
4/8  50/34/42/-2/0.00/0.0/666/85           37 WNW AERO 40 WNW RMY 39
4/9  65/34/50/+6/0.00/0.0/716/91           23 W   AERO 23 W   RMY N/A
4/10 77/45/61/+16/0.00/0.0/560/71          37 S   AERO 37 S   RMY 39
4/11 85/50/68/+23/0.00/0.0/642/81          28 S   AERO 28 S   RMY 30
4/12 68/47/58/+13/0.01/0.0/382/48          26 WNW AERO 28 WNW RMY N/A
4/13 58/39/49/+3/0.00/0.0/567/71           28 WNW AERO 31 NW  RMY 30
4/14 62/40/51/+5/0.00/0.0/801/100          22 NNW AERO 22 NNW RMY 24
4/15 68/40/54/+7/0.01/0.0/675/84           40 SSW AERO 45 SSW RMY 45
4/16 86/55/71/+24/T/0.0/758/94             38 W*  AERO 39 SW  RMY 42
4/17 75/48/62/+15/0.00/0.0/405/50          37 W   AERO 37 W   RMY 43
4/18 52/35/44/-4/0.00/0.0/779/96           25 ENE AERO 23 ENE RMY 25
4/19 54/34/44/-4/…./0.0/431/53           31 S   AERO 33 S   RMY 34
4/20 58/42/50/+1/…./0.0/270/33           25 SSW AERO 24 SSW RMY 23
4/21 45/42/44/-5/…./0.0/000/00           26 ESE AERO 29 ESE RMY 28
4/22 44/40/42/-7/0.06/0.0/…/..           22 NNE AERO 22 NNE RMY 20

4/23 Low temp since midnight is 37F; normal low is now 40F

DAILY RECORDS FOR APRIL 2017

4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,
BREAKS PREVIOUS RECORD OF 78F SET IN 1945

4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
TIES WITH PREVIOUS RECORD SET IN 1955

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

RECORDS FOR APRIL 23
HIGH 85 IN 1908, 2007
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 2.0 IN. IN 2012
PEAK GUST 64 MPH WNW IN 1962

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

TODAY’S REPORT PREPARED BY: Robert Millette