Rainfall Last 30 Days

Central Delmarva has had little rain over the last 30 days.

Central Delmarva has had little rain over the last 30 days, and this is affecting our temperatures.

By WBOC Chief Meteorologist Dan Satterfield

We ended November with just a little rain on Delmarva, but we really needed a good soaking. More rain is coming next week, so we have another shot at catching up a bit. The map above shows that the least rainfall in the last 30 days has been over Sussex County in Delaware, and Wicomico County in Maryland. This very dry ground has made forecasting temperatures rather difficult. The daytime temps. are warmer than expected and night-time temps. are colder than expected, because the dry ground heats up and cools off more quickly than the moist soil to our north and west.

The numerical weather models are run with soil moisture information, but the data is often not of sufficient quality and the model physics is not as good as it could be. Forecasters therefore must notice (and adjust) for this when making a forecast, and we have indeed been doing just that for a few weeks now. This is a good example of how giving a numerical weather model a very accurate starting point is critical to getting the best forecast.

 

Rainfall data for Salisbury shows a 6.54 inch deficit for Meteorological Fall from Sep- Nov.

CLIMATE NORMAL PERIOD 1981 TO 2010


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         73    129 PM  74    1993  53     20       55
  MINIMUM         61    754 AM  14    1976  34     27       44
  AVERAGE         67                        44     23       50

PRECIPITATION (IN)
  YESTERDAY        0.14          1.70 1985   0.12   0.02     0.06
  MONTH TO DATE    0.54                      3.43  -2.89     3.26
  SINCE SEP 1     17.44                     10.90   6.54     9.49
  SINCE JAN 1     51.50                     41.97   9.53    46.88