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-V4.05.php?inc=y&z=0 output

https://www.halethorpeweather.com/advforecast2-V5.17.php?inc=y&z=0 output

National Weather Service Forecast for: Halethorpe MD
Issued by: National Weather Service Baltimore, MD/Washington, D.C.
Updated: 4:34 pm EDT Apr 18, 2021

Halethorpe, MD
 
Tonight

Tonight: Isolated showers between 7pm and 9pm.  Mostly cloudy, with a low around 47. West wind 5 to 9 mph becoming light southwest  after midnight.  Chance of precipitation is 20%.
Isolated
Showers then
Mostly Cloudy
Monday

Monday: A slight chance of showers between 9am and 2pm.  Partly sunny, with a high near 68. Calm wind becoming west around 6 mph in the afternoon.  Chance of precipitation is 20%.
Slight Chance
Showers
Monday
Night
Monday Night: Mostly clear, with a low around 49. Light west wind.
Mostly Clear

Tuesday

Tuesday: Sunny, with a high near 73. Calm wind becoming southwest 5 to 9 mph in the morning.
Sunny

Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 53. South wind around 9 mph.
Partly Cloudy

Wednesday

Wednesday: Showers likely, then showers and possibly a thunderstorm after 2pm.  High near 66. Breezy.  Chance of precipitation is 80%.
Showers and
Breezy
Wednesday
Night
Wednesday Night: Showers before 8pm.  Low around 36. Chance of precipitation is 80%.
Showers then
Mostly Clear
Thursday

Thursday: Mostly sunny, with a high near 55.
Mostly Sunny

Thursday
Night
Thursday Night: Mostly clear, with a low around 40.
Mostly Clear

Lo 47 °F Hi 68 °F Lo 49 °F Hi 73 °F Lo 53 °F Hi 66 °F Lo 36 °F Hi 55 °F Lo 40 °F

 

Tonight
 
Isolated showers between 7pm and 9pm. Mostly cloudy, with a low around 47. West wind 5 to 9 mph becoming light southwest after midnight. Chance of precipitation is 20%.
Monday
 
A slight chance of showers between 9am and 2pm. Partly sunny, with a high near 68. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 20%.
Monday Night
 
Mostly clear, with a low around 49. Light west wind.
Tuesday
 
Sunny, with a high near 73. Calm wind becoming southwest 5 to 9 mph in the morning.
Tuesday Night
 
Partly cloudy, with a low around 53. South wind around 9 mph.
Wednesday
 
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 66. Breezy. Chance of precipitation is 80%.
Wednesday Night
 
Showers before 8pm. Low around 36. Chance of precipitation is 80%.
Thursday
 
Mostly sunny, with a high near 55.
Thursday Night
 
Mostly clear, with a low around 40.
Friday
 
Sunny, with a high near 65.
Friday Night
 
Partly cloudy, with a low around 46.
Saturday
 
A chance of showers. Partly sunny, with a high near 67. Chance of precipitation is 40%.
Saturday Night
 
Showers likely. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.
Sunday
 
A chance of showers. Partly sunny, with a high near 65. Chance of precipitation is 40%.

 

Forecast from NOAA-NWS for Halethorpe MD.

National Weather Service Forecast for: Arbutus, MD
Issued by: National Weather Service Baltimore/Washington
Updated: Sun, 18-Apr-2021 4:34pm EDT

Halethorpe, MD
 
  Monday

Monday: Slight Chance Rain Showers
Slight Chance Rain Showers
Tuesday

Tuesday: Sunny
Sunny
Wednesday

Wednesday: Showers And Thunderstorms
Showers And T-Storms
Thursday

Thursday: Mostly Sunny
Mostly Sunny
Friday

Friday: Sunny
Sunny
Saturday

Saturday: Chance Rain Showers
Chance Rain Showers
Sunday

Sunday: Rain Showers Likely
Rain Showers Likely
  Hi 68 °F Hi 73 °F Hi 66 °F Hi 55 °F Hi 65 °F Hi 67 °F Hi 65 °F
 
Tonight

Tonight: Isolated Rain Showers then Mostly Cloudy
Isolated Rain Showers then Mostly Cloudy
Monday
Night
Monday Night: Mostly Clear
Mostly Clear
Tuesday
Night
Tuesday Night: Partly Cloudy
Partly Cloudy
Wednesday
Night
Wednesday Night: Showers And Thunderstorms then Mostly Clear
Showers And T-Storms then Mostly Clear
Thursday
Night
Thursday Night: Mostly Clear
Mostly Clear
Friday
Night
Friday Night: Partly Cloudy
Partly Cloudy
Saturday
Night
Saturday Night: Rain Showers Likely
Rain Showers Likely
 
Lo 47 °F Lo 49 °F Lo 53 °F Lo 36 °F Lo 40 °F Lo 46 °F Lo 49 °F  

 

Tonight
 
Isolated rain showers between 7pm and 9pm. Mostly cloudy, with a low around 47. Southwest wind 2 to 9 mph. Chance of precipitation is 20%.
Monday
 
A slight chance of rain showers between 9am and 2pm. Partly sunny, with a high near 68. West wind 2 to 7 mph. Chance of precipitation is 20%.
Monday Night
 
Mostly clear, with a low around 49. West wind 2 to 6 mph.
Tuesday
 
Sunny, with a high near 73. Southwest wind 2 to 9 mph.
Tuesday Night
 
Partly cloudy, with a low around 53. South wind around 9 mph.
Wednesday
 
Rain showers likely between 8am and 2pm, then showers and thunderstorms. Partly sunny, with a high near 66. Chance of precipitation is 80%.
Wednesday Night
 
Showers and thunderstorms before 8pm. Mostly clear, with a low around 36. Chance of precipitation is 80%.
Thursday
 
Mostly sunny, with a high near 55.
Thursday Night
 
Mostly clear, with a low around 40.
Friday
 
Sunny, with a high near 65.
Friday Night
 
Partly cloudy, with a low around 46.
Saturday
 
A chance of rain showers after 8am. Partly sunny, with a high near 67. Chance of precipitation is 40%.
Saturday Night
 
Rain showers likely. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.
Sunday
 
Rain showers likely. Partly sunny, with a high near 65. Chance of precipitation is 60%.

 

Forecast from NOAA-NWS for Arbutus, MD.