Daily Discussion

| May 7, 2013 | Reply

 

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BLUE HILL METEOROLOGICAL OBSERVATORY

MILTON, MASSACHUSETTS

ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

 

DAILY DISCUSSION AND CLIMATE SUMMARY

TUESDAY, MAY 7, 2013

ALL TIMES ARE IN EASTERN STANDARD TIME

 

WARM, DRY, AND QUIET WITH PLENTY OF SUNSHINE;

 

The recent streak of cool temperatures has come to an end!

Temperatures today are averaging close to 10 degrees above normal.  The

high temperature on the summit reached 77F just after 2 PM EDT. That’s

the warmest temperature recorded on the summit so far this season, and

the warmest since October 6 (77F).

 

We’ve finally broken away from the cool, raw N-E flow.  A southerly wind

developed late yesterday, and continues for the most part today.

Consequently, a much warmer and more moist air mass has invaded the

region.  The dew point temperature has risen from the mid 40s this

morning to the mid 50s this afternoon.  You can feel just a touch of

humidity in the warm spring air.

 

Very dry conditions continue.  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.

 

Today’s observations:

 

7 A.M.

Weather: Scattered stratocumulus (2 levels) scattered thin cirrus,

stratocumulus distant ENE-SSW, few cirrus distant S-W, inversion present,

thin smoke layer aloft distant W-NNE, dark smoke layer along horizon

below inversion NW-NE, distant haze

Temperature: 59F; Dew Point: 44F; Wind: Estimated SW at 3 kts,

Wind: Light

Sea-level pressure: 30.19 ins. Hg, rising slightly then steady

Visibility: 60 miles, NW 70 miles, NNW-E-S lower, distant haze

6-hour min. temp: 50F

BHO SA 1155 40 SCT 60 SCT 250 –SCT 60 225/59/44/E2203/019/ SC DSNT

ENE-SSW FEW CI DSNT S-W INVSN PRSNT THN K LYR ALF DSNT W-NNE DRK K LYR

ALG HRZN BLO INVSN NW-NE DSNT HZ VSBY NW 70 NNW-E-S LWR WND LGT/ 8/501

51003 10059 20050

 

10 A.M.

Weather: Scattered stratocumulus, scattered cumulus, scattered thin

cirrus, lower stratocumulus distant E-SSW, small cumulus forming NE-S-WSW

and in the vicinity of the station, cirrus distant SSE-WNW invading the

sky, thin smoke layer distant W-NE, light distant haze

Temperature: 71F; Dew Point: 51F; Wind: SE at 7 kts,

Wind: Direction variable ESE-S

Sea-level pressure: 30.19 ins. Hg, steady then falling slightly

Visibility: 65 miles, light distant haze

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

BHO SA 1455 40 SCT 60 SCT 250 –SCT 65 224/71/51/1407/019/ LWR SC DSNT

E-SSW SML CU FRMG NE-S-WSW AND VCTY STN CI DSNT SSE-WNW INVADING THN K

LYR DSNT W-NE LGT DSNT HZ WND 11V17/ 8/504 58001

 

1 P.M.

Weather: Scattered cumulus, scattered stratocumulus cumulogenitus,

scattered thin cirrus, moderate cumulus all quadrants, cirrus invading

the sky, low stratus/fog over ocean distant ENE-E, mostly clear sky

distant N-NE, light distant haze

Temperature: 76F; Dew Point: 55F; Wind: S at 7 kts,

Wind: Direction variable ESE-SSW

Sea-level pressure: 30.16 ins. Hg, falling

Visibility: 65 miles, light distant haze

6-hour max. temp: 76F

BHO SA 1755 E45 SCT 55 SCT 250 –SCT 65 213/76/55/1707/016/ MDT CU ALQDS

CI INVADING LW STRA/FG OVR OCN DSNT ENE-E MSTLY CLR SKY DSNT N-NE LGT

DSNT HZ WND 12V21/ 8/404 58011 10076 20059

 

WEATHER SUMMARY FOR MONDAY, MAY 6, 2013

 

TEMPERATURE (DEGREES F)

MAX…..66     NORMAL…..64

MIN…..40     NORMAL…..45

MEAN….53     NORMAL…..54

 

DEPARTURE FROM 30-YEAR NORMAL………………..-1

TOTAL DEPARTURE FOR THE MONTH………………..-9 [-1.7 DEGREES/DAY]

 

HEATING DEGREE DAYS 

TOTAL HEATING UNITS FOR YESTERDAY…………12   DEPARTURE……….+1

TOTAL HEATING UNITS FOR THE MONTH…………78   DEPARTURE……….+7

TOTAL HEATING UNITS FOR THE SEASON………5600   DEPARTURE……..-506

TOTAL HEATING UNITS LAST SEASON TO DATE….4808   DIFFERENCE…….+792

 

PEAK GUST AND AVERAGE WIND SPEED (MPH)

PEAK WIND GUST FOR YESTERDAY……………17 S   AT  8:05 P.M.

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

                   ASOS………………..20 S   AT  9:26 P.M.

                   DAVIS……………….19 S   AT  8:04 P.M. RMY: 20

THE FASTEST MILE FOR YESTERDAY………….15 S   AT  9:35 P.M.

MAXIMUM 2-MINUTE ASOS AVERAGE…………..15 S   AT  8:05 P.M.

MAXIMUM 2-MINUTE DAVIS AVERAGE………….14 S   AT  9:34 P.M.

AVERAGE WIND SPEED AND DIRECTION……….6.5 S

                   ASOS……………….6.4

                   DAVIS………………5.9 SSE [156 deg]

 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)

TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE………..-0.12

                         ASOS…………..0.00

TOTAL PRECIPITATION FOR THE MONTH………Trace  DEPARTURE………..-0.74

                         ASOS…………..0.00

TOTAL PRECIPITATION FOR THE YEAR……….16.38  DEPARTURE………..-2.91

                         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  morning low temp: 50F; 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 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

 

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

 

TODAY’S REPORT PREPARED BY: Sean Fankhauser

 

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