Daily Discussion

| May 8, 2013 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY

MILTON, MASSACHUSETTS

ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

 

DAILY DISCUSSION AND CLIMATE SUMMARY

WEDNESDAY, MAY 8, 2013

ALL TIMES ARE IN EASTERN STANDARD TIME

 

WARMEST OF THE YEAR AND SEASON YESTERDAY AT 77 DEGREES

FIRST MEASURABLE RAINFALL LATE THIS MORNING WITH SHOWERS

AIR MASS BECOMES MUCH MORE HUMID WITH DEW POINTS IN 60’S

 

Temperatures finally rose into the 70’s yesterday afternoon

reaching 77 degrees, the warmest this year so far. It was

a touch of summer after all of the days with cool weather

which prevailed recently this month with northeast to east

winds.

 

Humidity has been on the increase starting yesterday and

the new air mass has brought the first measurable rainfall

since April 25.  The showers began just after 11 A.M. EDT

and left a tenth of an inch by early this afternoon. Dew

point temperature rose into the low to middle 60’s by the

late morning then suddenly fell back into the mid 50’s.

 

Very dry conditions continued from March 20 through May 7 (49 days),

Blue Hill has received only 2.44 inches of precipitation. That is only

32% of the 30-year normal of 7.67 inches for this time period.  No

measurable precipitation has fallen since April 25 until today,

May 8th.

 

Today’s observations:

 

7 A.M.

Weather: Partially obscured with fog, broken low stratus, overcast

stratocumulus, higher altocumulus visible, small breaks in overcast,

fog thinning rapidly, fog obscuring 3/10 of sky 

Temperature: 60F; Dew Point: 59F; Wind: ESE at 6 kts,

Sea-level pressure: 30.20 ins. Hg, rising slightly then more slowly

Visibility: 11/2 miles in fog, variable 1 to 2 miles, N-NNE 1/2 mile,

visibility increasing rapidly

6-hour min. temp: 55F

24-hour precip: none

BHO SA 1155 –X E3 BKN 20 OVC 1V2F 228/60/59/1106/020/ F3 HIER AC CLDS VSB

SML BINOVC SUN OCNL DMLY VSB VSBY 1V2 N-NE ONE HALF VSBY INCRSNG RPDLY ALQDS/

8/63/ 51015 10060 20055

 

10 A.M.

Weather: Broken cumulus, moderate cumulus, few towering cumulus,

dark bases, small cumulonimbi SE-SW and NW virga/showers of rain associated

moving NNW, broken altocumulus, altocumulus lenticularis SW-NW,

breaks in overcast, fog bank over city N and extending NNE-ENE,

estimated top 7 hundred over city north

Temperature: 68F; Dew Point: 58F; Wind: SE at 7 kts,

Wind: Direction variable ENE-S

Sea-level pressure: 30.20 ins. Hg, steady

Visibility: 20 miles, except 15 miles NW-NE, mostly due to fog

bank extending NNE-ENE, 20 miles SE-SW in showers of rain all moving

toward the NNW fog bank NW-ENEestimated top 15 hundred feet over city N 

BHO SA 1455 E18 BKN 75 BKN 100 OVC 20 227/68/58/1407/020/

SML CBS SE-SW AND DSNT NNW DRK BASES SHRA/VIRGA ASSOCTD MOVG NNW

MDT CU/FEW TCU ALQDS BINOVC, FG BNK OVR CTY N ESTMTD TOP 7 HND XTDNG NNE-ESE ALG/OFFSHR

VSBY NW-NE 15 FG BNK VSBY 20 SE-SW PCPN/HZY WND 07V17/ 8/34/ 53000

 

1 P.M.

Weather: Broken cumulus, small distant cumulonimbi, virga, showers of rain all

moving NNW-N, moderate cumulus, few towering cumulus, dark bases all quadrants

few altocumulus lenticularis, overcast dense cirrus 

Temperature: 68F; Dew Point: 55F; Wind: SE at 15G23 kts,

Wind: Direction variable ESE-S

Sea-level pressure: 30.15 ins. Hg, falling then more rapidly

Visibility: 20 miles, except 15 miles NNW, distant haze

6-hour max. temp: 71F

6-hour precip: 0.11 inch

BHO SA 1755 E20 BKN 55 BKN 75 BKN 200 OVC 20 209/68/55/1415G23/015/

SML DSNT CBS MOVG N-NNW/VIRGA/SHRA ALQDS MODT/FEW TCU DRK BASES ALQDS

NMRS BRGHTS SPTS IOVC VSBY NNW 15 WND 11V17/ 8/842 58018

MANUAL 6011/ ASOS 60010 10071 20060

 

WEATHER SUMMARY FOR TUESDAY, MAY 7, 2013

 

TEMPERATURE (DEGREES F)

MAX…..77     NORMAL…..64

MIN…..50     NORMAL…..45

MEAN….64     NORMAL…..55

 

DEPARTURE FROM 30-YEAR NORMAL………………..+9

TOTAL DEPARTURE FOR THE MONTH……………….. 0 [-0.2 DEGREE/DAY]

 

HEATING DEGREE DAYS 

TOTAL HEATING UNITS FOR YESTERDAY………….1   DEPARTURE………-10

TOTAL HEATING UNITS FOR THE MONTH…………79   DEPARTURE……….-3

TOTAL HEATING UNITS FOR THE SEASON………5601   DEPARTURE……..-516

TOTAL HEATING UNITS LAST SEASON TO DATE….4815   DIFFERENCE…….+786

 

PEAK GUST AND AVERAGE WIND SPEED (MPH)

PEAK WIND GUST FOR YESTERDAY……………21 S   AT  8:20 P.M.

                   AERO………………..18 S   AT  7:28 P.M.

                   ASOS………………..24 S   AT  4:25 P.M.

                   DAVIS……………….23 S   AT  3:19 P.M. RMY: 25

THE FASTEST MILE FOR YESTERDAY………….17 SSW AT  4:05 P.M.

MAXIMUM 2-MINUTE ASOS AVERAGE…………..20 SSW AT  4:05 P.M.

MAXIMUM 2-MINUTE DAVIS AVERAGE………….19 SSW AT  4:05 P.M.

AVERAGE WIND SPEED AND DIRECTION………10.1 S

                   ASOS……………….9.6

                   DAVIS………………9.0 SSW [200 deg]

 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)

TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE………..-0.13

                         ASOS…………..0.00

TOTAL PRECIPITATION FOR THE MONTH………Trace  DEPARTURE………..-0.87

                         ASOS…………..0.00

TOTAL PRECIPITATION FOR THE YEAR……….16.38  DEPARTURE………..-3.04

                         ASOS…………..N/A*

*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

                       

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)

TOTAL SNOWFALL 24 HRS ENDING 7 A.M………0.0   DEPARTURE………….0.0

TOTAL SNOWFALL FOR THE MONTH……………0.0   DEPARTURE………….0.0

TOTAL SNOWFALL FOR THE SEASON………….99.0   DEPARTURE………..+36.3

 

PRELIMINARY CLIMATE SUMMARY FOR MAY 2013 CALENDAR DAY DATA

DATA REPORTED:

DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST

AERO: Aerovane wind recording system gust

RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011

TSTM: Thunderstorm day (thunder heard some time during day)

….: Data not yet available, records not finalized

                             

5/1  67/45/56/+3/0.00/…/..         18 E   AERO 16 MPH E   RMY 17

5/2  75/43/59/+6/T/…/..            29 NE  AERO 26 MPH NE  RMY 29

5/3  54/42/48/-5/0.00/…/..         24 NE  AERO 25 MPH NE  RMY 28

5/4  55/40/48/-6/0.00/…/..         21 NE  AERO 23 MPH NE  RMY 23  

5/5  58/37/48/-6/0.00/…/..         17 ENE AERO 17 MPH ENE RMY 20

5/6  66/40/53/-1/0.00/…/..         17 S   AERO 18 MPH S   RMY 20

5/7  77/50/64/+9/0.00/…/..         21 S   AERO 23 MPH S   RMY 25

 

5/8  morning low temp: 55F; the normal low is now 45F

 

DAILY RECORDS FOR MAY 2013

None so far.

 

DAILY EXTREMES

Temperature and precipitation records back to 1885, and

wind records back to 1940 (e = estimated):

 

RECORDS FOR MAY 8

HIGH 89F IN 2000

LOW 29F IN 1956

PRECIP 1.48 INCHES IN 1886

SNOWFALL TRACE IN 1898, 1947

PEAK GUST 68e MPH NNW IN 1943

 

RECORDS FOR MAY 9

HIGH 93F IN 2000

LOW 31F IN 1947

PRECIP 2.72 INCHES IN 1954

SNOWFALL 5.0 INS IN 1977 (RECORD FOR MAY)

PEAK GUST 70e MPH NE IN 1977

 

TODAY’S REPORT PREPARED BY: Robert Skilling

 

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