Daily Discussion

| May 6, 2013 | Reply

 

BLUE HILL METEOROLOGICAL OBSERVATORY

MILTON, MASSACHUSETTS

ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

 

DAILY DISCUSSION AND CLIMATE SUMMARY

MONDAY, MAY 6, 2013

ALL TIMES ARE IN EASTERN STANDARD TIME

 

VERY DENSE FOG WITH ZERO VISIBILITY EARLY TODAY

THEN SUNSHINE AND TEMPS. WARMING INTO 60’S

 

Low stratus clouds and dense fog formed in the very early

morning hours and here at the summit we had zero visibiity

as observed around 7:30 A.M. EDT this morning. By 8 A.M.

the fog was beginning to lift and visibility up to two

to three miles as the sun began to break out just after 9 A.M.

A fog bank could been seen offshore early this afternoon

to our NNE-SE so much cooler temperatures are likely

prevailing along the coast as compared to our 65 degrees

at the summit at 2 P.M. with continuing very light and

variable winds.

 

Very dry weather continues.  From March 20 through May 5 (47 days),

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

33% of the 30-year normal of 7.42 inches for this time period.  No

measurable precipitation has fallen since April 25.

 

Today’s observations:

 

7 A.M.

Weather: Obscurement, heavy fog

Temperature: 42F; Dew Point: 42F; Wind: SE at 3 kts

Sea-level pressure: 30.30 ins. Hg, rising then more slowly

Visibility: 1/16 mile, heavy fog, visibility slowly increasing

6-hour min. temp: 40F

BHO SA 1155 W2 X 1/16F 259/42/42/1403/030/ SKY BRGHTNG VSBY INCRSNG SLWLY/

8//// 51012 10042 20040

 

10 A.M.

Weather: Clear, few stratus mostly distant N-E,

Temperature: 54F; Dew Point: 45F; Wind: S at 3 kts,

Wind: Light and variable

Sea-level pressure: 30.29 ins. Hg, nearly steady

Visibility: 20 miles, smoke layer surface based and aloft

SW-N estimated top 15 hundred feet over city N, hazy all quadrants 

BHO SA 1455 CLR 20 258/54/45/1803/029/ FEW STRA MSTLY DSNT N-E

K LYR SFC BASED/ALF SW-N ESTMTD TOP 15 HND OVR CTY N HAZY ALQDS

WND L/V/ 8/600 58001 

 

1 P.M.

Weather: Clear, few smal cumulus forming distant SE-S, few cirrus

distant N, smoke layer NW-N surface based and aloft estimated top

12 hundred feet over city north 

Temperature: 65F; Dew Point: 47F; Wind: NE at 2 kts, (estimated)

Wind: Light and variable

Sea-level pressure: 30.24 ins. Hg, falling then more rapidly

Visibility: 30 miles, except 20 miles NW-N, smoke layer and hazy,

20 miles NNE-SE, fog bank, WNW 45 miles, distant haze  

6-hour max. temp: 65F

BHO SA 1455 CLR 30 239/65/47/E0402/024/ FEW SML CU FRMG DSNT SE-S

FEW CI DSNT N K LYR NW-N SFC BASED ESTMTD TOP 12 HND OVR CTY N

FG BNK/STRA OFFSHR NNE-SE VSBY NW-N 20 KHZ NNE-SE 20 FG BNK

VSBY WNW 45 DSNT HZ WND L/V/ 8/101 58019 10065 20042

 

WEATHER SUMMARY FOR SUNDAY, MAY 5, 2013

 

TEMPERATURE (DEGREES F)

MAX…..58     NORMAL…..63

MIN…..37     NORMAL…..45

MEAN….48     NORMAL…..54

 

DEPARTURE FROM 30-YEAR NORMAL………………..-6

TOTAL DEPARTURE FOR THE MONTH………………..-8 [-1.8 DEGREES/DAY]

 

HEATING DEGREE DAYS 

TOTAL HEATING UNITS FOR YESTERDAY…………17   DEPARTURE……….+5

TOTAL HEATING UNITS FOR THE MONTH…………66   DEPARTURE……….+6

TOTAL HEATING UNITS FOR THE SEASON………5588   DEPARTURE……..-507

TOTAL HEATING UNITS LAST SEASON TO DATE….4795   DIFFERENCE…….+793

 

PEAK GUST AND AVERAGE WIND SPEED (MPH)

PEAK WIND GUST FOR YESTERDAY……………17 ENE AT  12:33 P.M.

                   AERO………………..17 ENE AT  12:33 P.M. * 

                   ASOS………………..21 ENE AT  12:33 P.M.

                   DAVIS……………….19 N   AT   8:53 A.M. RMY: 20

THE FASTEST MILE FOR YESTERDAY………….12 ENE AT  12:19 P.M. 

MAXIMUM 2-MINUTE ASOS AVERAGE…………..14 ENE AT   2:21 P.M.

MAXIMUM 2-MINUTE DAVIS AVERAGE………….13 E   AT  12:51 P.M.

AVERAGE WIND SPEED AND DIRECTION……….9.0 E

                   ASOS……………….8.8

                   DAVIS………………8.2 ENE [060 deg]

* Last of several occurrences…

 

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………..-0.62

                         ASOS…………..0.00

TOTAL PRECIPITATION FOR THE YEAR……….16.38  DEPARTURE………..-2.79

                         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  morning low temp: 40F; 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 6

HIGH 90F IN 1930

LOW 29F IN 1891

PRECIP 1.04 INCHES IN 1890

SNOWFALL TRACE IN 1917,1996

PEAK GUST 65 MPH SSE IN 1989

 

RECORDS FOR MAY 7

HIGH 93F IN 1930

LOW 33F IN 1970

PRECIP 1.19 INCHES IN 2005

SNOWFALL TRACE IN 1967

PEAK GUST 66e MPH WNW IN 1940

 

TODAY’S REPORT PREPARED BY: Robert Skilling

 

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