Daily Discussion

| May 12, 2013 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY

MILTON, MASSACHUSETTS

ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

 

DAILY DISCUSSION AND CLIMATE SUMMARY

SUNDAY, MAY 12, 2013 MOTHERS DAY

ALL TIMES ARE IN EASTERN STANDARD TIME

 

GLOOMY START TO THE DAY WITH SOME LIGHT RAIN AND DENSE FOG

VISIBILITY WAS DOWN TO ZERO VARIABLE 1/16 AT THE SUMMIT

ONLY VERY SMALL AMOUNTS OF RAINFALL PAST 24 HOURS 

TEMPERATURES CONTINUE ON THE MILD SIDE

GUSTY WINDS ON SATURDAY

 

The morning began with very dense fog and some light

rain and rain showers.  Visibility was variable between

zero and 1/16 of a mile at 8 A.M. EDT.  The total rainfall

for yesterday and early today was only 0.08 inch. 

The mild weather trend continues with Saturday’s high of

70 degrees running 5 degrees above the average for the

date and this morning’s low of 57 up 10 degrees on the

plus side of normal. 

 

After lower than average winds so far this month winds yesterday

averaged 16 MPH with peak gusts to around 45 MPH making

Saturday our windiest day since April 19th  Winds have

averaged quite light at 8.4 MPH through the first ten days

of May.

 

Today’s observations:

 

7 A.M.

Weather: Obscuremeent with heavy fog, very light rain occurring

Temperature: 57F; Dew Point: 57F; Wind: S at 7 kts

Sea-level pressure: 29.85 ins. Hg, falling then steady

Visibility: zero variable to 1/16 mile in dense fog

24-hour precip: 0.05 inch

6-hour min. temp: 57F

6-hour precip: 0.01 inch

24-hour precip: 0.05 inch

BHO SA 1155 W2 X 0VR-F 044/57/57/1907/966/ VSBY 0V1/16 PCPN VRY LGT/

8//// 55004 ASOS 60001 MANUAL 6001/ ASOS 70004 MANUAL 70005

10059 20057

 

10 A.M.

Weather: Broken variable to overcast stratus, overcast nimbostratus,

light rain shower occurring with fog, bright spots in overcast   

Temperature: 60F; Dew Point: 59F; Wind: SSW at 7 kts,

Sea-level pressure: 29.63 ins. Hg, falling then falling more slowly

Visibility: 5 miles, light rain shower and fog 

3-hour precip: 0.02 in. 

BHO SA 1455 E5V BKN 60 OVC 5RW-F 034/60/59/2107/963/

5 BKN V OVC BRGHT SPTS IOVC RB35/ 8/72/ 56010

MANUAL 6002/ ASOS 60001

 

WEATHER SUMMARY FOR SATURDAY, MAY 11, 2013

 

TEMPERATURE (DEGREES F)

MAX…..70     NORMAL…..65

MIN…..56     NORMAL…..46

MEAN….63     NORMAL…..56

 

DEPARTURE FROM 30-YEAR NORMAL………………..+7

TOTAL DEPARTURE FOR THE MONTH……………….+32 [+2.7 DEGREE/DAY]

 

HEATING DEGREE DAYS 

TOTAL HEATING UNITS FOR YESTERDAY………….2   DEPARTURE……….-8

TOTAL HEATING UNITS FOR THE MONTH…………87   DEPARTURE………-36

TOTAL HEATING UNITS FOR THE SEASON………5609   DEPARTURE……..-549

TOTAL HEATING UNITS LAST SEASON TO DATE….4856   DIFFERENCE…….+753

 

PEAK GUST AND AVERAGE WIND SPEED (MPH)

PEAK WIND GUST FOR YESTERDAY……………43 SSW AT  12:18 P.M.

                   AERO………………..44 SSW AT  12:18 P.M.

                   ASOS………………..46 SSW AT  12:18 P.M.

                   DAVIS……………….46 SSW AT  12:17 P.M. RMY: 46

THE FASTEST MILE FOR YESTERDAY………….33 SSW AT  12:16 P.M. 

MAXIMUM 2-MINUTE ASOS AVERAGE…………..33 SSW AT  12:16 P.M.

MAXIMUM 2-MINUTE DAVIS AVERAGE………….34 SSW AT  12:16 P.M.

AVERAGE WIND SPEED AND DIRECTION………16.2 S

                   ASOS………………15.8 

                   DAVIS……………..15.2 S [190 deg]

*Last of several occurrences…

 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)

TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05  DEPARTURE………..-0.07

                         ASOS…………..0.04

TOTAL PRECIPITATION FOR THE MONTH……….0.91  DEPARTURE………..-0.43

                         ASOS…………..0.87

TOTAL PRECIPITATION FOR THE YEAR……….17.29  DEPARTURE………..-2.60

                         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/+3/0.00/845/100        18 E   AERO 16 MPH E   RMY 17

5/2  75/43/59/+6/T/669/79            29 NE  AERO 26 MPH NE  RMY 29

5/3  54/42/48/-5/0.00/706/83         24 NE  AERO 25 MPH NE  RMY 28

5/4  55/40/48/-6/0.00/843/99         21 NE  AERO 23 MPH NE  RMY 23  

5/5  58/37/48/-6/0.00/752/88         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  71/55/63/+8/0.42/…/..         31 SSE AERO 35 MPH SSE RMY 35 TSTM

5/9  66/56/61/+6/0.41/…/..         16 NE  AERO 16 MPH NE  RMY 18 TSTM

5/10 79/54/66/+11/0.00/…/..        18 S   AERO 21 MPH S   RMY N/A

5/11 70/56/63/+7/…./…/..         43 SSW AERO 44 MPH SSW RMY 46

 

5/12 morning low temp: 57F; the normal low is now 47F

 

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 12

HIGH 88F IN 2001

LOW 29F IN 1907

PRECIP 1.49 INCHES IN 1968

PEAK GUST 76 MPH S IN 1974

 

RECORDS FOR MAY 13

HIGH 85F IN 1947

LOW 35F IN 1914, 2005

PRECIP 2.39 INCHES IN 2006

PEAK GUST 49 MPH NNW IN 1965

 

TODAY’S REPORT PREPARED BY: Robert Skilling

Category: Daily Discussions

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