Thursday, March 21, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MARCH 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A CLOUDY YET WARM DAY FOLLOWING THE BEGINNING OF
SPRING….

We observed southerly winds this morning shift to southeast
by the afternoon, with a max gust of 26 mph so far today.
Average wind speed was around 10 mph, bringing in some
warmer air from the south-southeast. A pressure decrease
of more than 4 mb has been seen since this morning in
conjunction was an increase in cloud cover. Visibility
increased from 45 miles to 70 miles by the 10 A.M.
observation. The high temperature so far today is 50F,
4 degrees above the normal daily maximum of 46F. The
low since midnight is 32F, 4 degrees above the daily
normal of 28F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 36F; Dew Point: 29F; Wind: S at 10G16 kts
Sea-level pressure: 30.23 ins. Hg, rising then falling
Visibility: 45 miles, thin smoke layer in all directions
6-hr Max temp: 36F
6-hr Min temp: 33F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 120 SCT E250 BKN 45 238/36/29/1810G16/023/
THN K LYR ALQDS/ 8/055 55004 10036 20033

10 A.M.
Weather: Overcast stratocumulus
Temperature: 45F; Dew Point: 26F; Wind: S at 7G14 kts
Sea-level pressure: 30.26 ins. Hg, falling then more quickly
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E60 OVC 70 248/45/26/1707G14/026/ 8/4// 58010

1 P.M.
Weather: Overcast stratus
Temperature: 49F; Dew Point: 27F; Wind: SE at 12G18 kts
Sea-level pressure: 30.18 ins. Hg, falling then more quickly
Visibility: 70 miles
6-hr Max temp: 50F
6-hr Min temp: 36F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E50 OVC 70 220/49/27/1512G18/018/ 8/6//
56028 10050 20036

SUMMARY FOR WEDNESDAY, MARCH 20, 2019

TEMPERATURE (DEGREES F)
MAX…..50   NORMAL…..45
MIN…..27   NORMAL…..28
MEAN….39   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL…………………….+2
TOTAL DEPARTURE FOR THE MONTH……………………-37 [-2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..26   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH………….663   DEPARTURE……..+37
TOTAL HEATING UNITS FOR THE SEASON………..5149   DEPARTURE……..-45
TOTAL HEATING UNITS LAST SEASON TO DATE……4776   DIFFERENCE……+373

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 S   AT 4:52 P.M.
AERO…………………….M
ASOS…………………….29 S   AT 4:52 P.M.
DAVIS……………………33 S   AT 3:39 P.M.  RMY 29
FASTEST MILE FOR YESTERDAY………………….25 S   AT 5:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 S   AT 5:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 S   AT 5:10 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.5 S
ASOS…………………..10.8
DAVIS………………….10.9 SSW [193 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.19
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.97  DEPARTURE…….-0.55
ASOS…………..2.97
TOTAL PRECIPITATION FOR THE YEAR……….11.91  DEPARTURE…….-0.03
ASOS………….12.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.4
TOTAL SNOWFALL FOR THE MONTH……………21.0  DEPARTURE…….+11.6
TOTAL SNOWFALL FOR THE SEASON…………..45.5  DEPARTURE…….-10.9

PRELIMINARY CLIMATE SUMMARY FOR MARCH 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

03/01 38/17/28/-3/…./…/…/..           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/…./…/…/..           29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/…./…/…/..           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/…./…/…/..           33 W   AERO 18 W   RMY 32
03/05 29/10/20/-12/0.00/0.0/…/..          28 WNW AERO 12 SW  RMY N/A
03/06 24/10/17/-15/0.00/0.0/…/..          40 WNW AERO 25 WNW RMY 41
03/07 26/6/16/-17/0.00/0.0/…/..           35 W   AERO 18 W   RMY 34
03/08 35/11/23/-10/0.00/0.0/…/..          23 WSW AERO M  M   RMY M
03/09 43/22/33/0/0.00/0.0/…/..            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/…./…/…/..            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/…./…/…/..           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/…./…/…/..            32 N   AERO 33 N   RMY 34
03/13 43/24/34/0/…./…/…/..            18 W   AERO 21 W   RMY 23
03/14 48/32/40/0/…./…/…/..            25 S   AERO 28 S   RMY M
03/15 58/40/49/+14/0.12/0.0/…/..          37 SSW AERO 38 SSW RMY 39
03/16 50/31/41/+6/0.00/0.0/…/..           45 W   AERO 46 W   RMY 48
03/17 40/26/33/-3/0.00/0.0/…/..           40 WNW AERO M  M   RMY N/A
03/18 41/22/32/-4/0.00/0.0/…/..           29 W   AERO M  M   RMY 30
03/19 44/25/35/-1/0.00/0.0/…/..           25 W   AERO M  M   RMY N/A
03/20 50/27/39/+2/0.00/0.0/…/..           26 S   AERO M  M   RMY 29

03/21 Low temp since midnight is 33F; normal low is 28F

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

RECORDS FOR MARCH 21
HIGH 81 IN 1921
LOW 2 IN 1885
PRECIP 2.67 INS. IN 1974
SNOWFALL 10.6 INS. IN 1958
PEAK GUST 72 MPH NE IN 1958

RECORDS FOR MARCH 22
HIGH 81 IN 2012
LOW 3 IN 1885
PRE 3.48 INS. IN 2001
SNOW 8.7 INS. 1967
WIND 84e MPH E IN 1977

TODAY’S REPORT PREPARED BY: Benjamin Turner