The NWS is in the process of changing over the forecast system to a new method, known as API (Application Programming Interface). In the mean time both are available and sometimes the new one (API) comes up with errors. So this is a side-by-side comparison of the two methods.

https://www.halethorpeweather.com/advforecast2-V4.04.php?inc=y&z=0 output

https://www.halethorpeweather.com/advforecast2-V5.09.php?inc=y&z=0 output

National Weather Service Forecast for: Halethorpe MD
Issued by: National Weather Service Baltimore, MD/Washington, D.C.
Updated: 10:32 am EDT Mar 21, 2019

Halethorpe, MD
 
Today

Today: Rain. The rain could be heavy at times.  High near 51. Northeast wind 6 to 8 mph.  Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Heavy Rain


Tonight

Tonight: Showers before 11pm, then rain likely between 11pm and 2am, then a chance of showers after 2am.  Low around 41. Northeast wind 9 to 17 mph becoming northwest after midnight. Winds could gust as high as 22 mph.  Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Rain then
Rain Likely

Friday

Friday: Scattered showers after noon.  Partly sunny, with a high near 52. Breezy, with a west wind 18 to 21 mph, with gusts as high as 36 mph.  Chance of precipitation is 40%.
Breezy.
Mostly Sunny
then
Scattered
Showers
Friday
Night
Friday Night: Partly cloudy, with a low around 32. Breezy, with a northwest wind 20 to 24 mph, with gusts as high as 46 mph.
Partly Cloudy
and Breezy

Saturday

Saturday: Sunny, with a high near 50. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 34 mph.
Sunny and
Breezy then
Sunny

Saturday
Night
Saturday Night: Clear, with a low around 32.
Clear


Sunday

Sunday: Sunny, with a high near 58.
Sunny


Sunday
Night
Sunday Night: Mostly cloudy, with a low around 44.
Mostly Cloudy


Monday

Monday: Showers likely.  Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Showers
Likely

Hi 51 °F Lo 41 °F Hi 52 °F Lo 32 °F Hi 50 °F Lo 32 °F Hi 58 °F Lo 44 °F Hi 61 °F

Flood Watch
Hazardous Weather Outlook
 

Today
 
Rain. The rain could be heavy at times. High near 51. Northeast wind 6 to 8 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Tonight
 
Showers before 11pm, then rain likely between 11pm and 2am, then a chance of showers after 2am. Low around 41. Northeast wind 9 to 17 mph becoming northwest after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday
 
Scattered showers after noon. Partly sunny, with a high near 52. Breezy, with a west wind 18 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 40%.
Friday Night
 
Partly cloudy, with a low around 32. Breezy, with a northwest wind 20 to 24 mph, with gusts as high as 46 mph.
Saturday
 
Sunny, with a high near 50. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 34 mph.
Saturday Night
 
Clear, with a low around 32.
Sunday
 
Sunny, with a high near 58.
Sunday Night
 
Mostly cloudy, with a low around 44.
Monday
 
Showers likely. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Monday Night
 
A chance of showers. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.
Tuesday
 
Partly sunny, with a high near 45.
Tuesday Night
 
Partly cloudy, with a low around 30.
Wednesday
 
Mostly sunny, with a high near 48.

 

Forecast from NOAA-NWS for Halethorpe MD.

National Weather Service Forecast for: Arbutus, MD
Issued by: National Weather Service Baltimore/Washington
Updated: Thu, 21-Mar-2019 10:32am EDT

Halethorpe, MD
 
Today

Today: Heavy Rain
Heavy Rain
Friday

Friday: Partly Sunny then Scattered Rain Showers
Partly Sunny then Scattered Rain Showers
Saturday

Saturday: Sunny
Sunny
Sunday

Sunday: Sunny
Sunny
Monday

Monday: Rain Showers Likely
Rain Showers Likely
Tuesday

Tuesday: Chance Rain Showers
Chance Rain Showers
Wednesday

Wednesday: Mostly Sunny
Mostly Sunny
 
Hi 51 °F Hi 52 °F Hi 50 °F Hi 58 °F Hi 61 °F Hi 45 °F Hi 48 °F  
 
Tonight

Tonight: Rain
Rain
Friday
Night
Friday Night: Partly Cloudy
Partly Cloudy
Saturday
Night
Saturday Night: Clear
Clear
Sunday
Night
Sunday Night: Mostly Cloudy
Mostly Cloudy
Monday
Night
Monday Night: Rain Showers Likely
Rain Showers Likely
Tuesday
Night
Tuesday Night: Slight Chance Rain Showers then Partly Cloudy
Slight Chance Rain Showers then Partly Cloudy
Wednesday
Night
Wednesday Night: Mostly Clear
Mostly Clear
 
Lo 41 °F Lo 32 °F Lo 32 °F Lo 44 °F Lo 33 °F Lo 30 °F Lo 34 °F  

Flood Watch
 

Today
 
Rain. Cloudy, with a high near 51. East wind 6 to 12 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Tonight
 
Rain before 8pm, then rain showers between 8pm and 11pm, then rain likely between 11pm and 2am, then a chance of rain showers between 2am and 5am. Mostly cloudy, with a low around 41. North wind 9 to 17 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Friday
 
Scattered rain showers after noon. Partly sunny, with a high near 52. Northwest wind 17 to 23 mph, with gusts as high as 40 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Friday Night
 
Partly cloudy, with a low around 32. Northwest wind 20 to 24 mph, with gusts as high as 46 mph. New rainfall amounts less than a tenth of an inch possible.
Saturday
 
Sunny, with a high near 50. Northwest wind around 20 mph, with gusts as high as 35 mph.
Saturday Night
 
Clear, with a low around 32.
Sunday
 
Sunny, with a high near 58.
Sunday Night
 
Mostly cloudy, with a low around 44.
Monday
 
Rain showers likely after 8am. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Monday Night
 
Rain showers likely. Mostly cloudy, with a low around 33. Chance of precipitation is 60%.
Tuesday
 
A chance of rain showers. Partly sunny, with a high near 45. Chance of precipitation is 40%.
Tuesday Night
 
A slight chance of rain showers before 8pm. Partly cloudy, with a low around 30.
Wednesday
 
Mostly sunny, with a high near 48.
Wednesday Night
 
Mostly clear, with a low around 34.

 

Forecast from NOAA-NWS for Arbutus, MD.