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-V5.12.php?inc=y&z=0 output

National Weather Service Forecast for: Halethorpe MD
Issued by: National Weather Service Baltimore, MD/Washington, D.C.
Updated: 10:31 pm EDT May 24, 2019

Halethorpe, MD
 
Tonight

Tonight: Mostly cloudy, with a low around 62. Northeast wind 3 to 7 mph.
Mostly Cloudy

Saturday

Saturday: Partly sunny, with a high near 79. South wind 7 to 13 mph, with gusts as high as 21 mph.
Partly Sunny

Saturday
Night
Saturday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers.  Mostly cloudy, with a low around 67. South wind 5 to 11 mph.  Chance of precipitation is 30%.
Chance
T-storms
Sunday

Sunday: A chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 89. West wind 6 to 9 mph.  Chance of precipitation is 30%.
Mostly Sunny
then Chance
T-storms
Sunday
Night
Sunday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 68. Northwest wind 3 to 7 mph.  Chance of precipitation is 30%.
Chance
T-storms
Memorial
Day
Memorial Day: A slight chance of showers and thunderstorms.  Partly sunny, with a high near 82. Chance of precipitation is 20%.
Slight Chance
T-storms
Monday
Night
Monday Night: A chance of showers.  Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Chance
Showers
Tuesday

Tuesday: Partly sunny, with a high near 88.
Partly Sunny

Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 71.
Partly Cloudy

Lo 62 °F Hi 79 °F Lo 67 °F Hi 89 °F Lo 68 °F Hi 82 °F Lo 66 °F Hi 88 °F Lo 71 °F

 

Tonight
 
Mostly cloudy, with a low around 62. Northeast wind 3 to 7 mph.
Saturday
 
Partly sunny, with a high near 79. South wind 7 to 13 mph, with gusts as high as 21 mph.
Saturday Night
 
A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 67. South wind 5 to 11 mph. Chance of precipitation is 30%.
Sunday
 
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. West wind 6 to 9 mph. Chance of precipitation is 30%.
Sunday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Northwest wind 3 to 7 mph. Chance of precipitation is 30%.
Memorial Day
 
A slight chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 20%.
Monday Night
 
A chance of showers. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Tuesday
 
Partly sunny, with a high near 88.
Tuesday Night
 
Partly cloudy, with a low around 71.
Wednesday
 
Mostly sunny, with a high near 92.
Wednesday Night
 
Partly cloudy, with a low around 71.
Thursday
 
Mostly sunny, with a high near 88.
Thursday Night
 
Partly cloudy, with a low around 64.
Friday
 
Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Halethorpe MD.

National Weather Service Forecast for: Arbutus, MD
Issued by: National Weather Service Baltimore/Washington
Updated: Fri, 24-May-2019 10:31pm EDT

Halethorpe, MD
 
  Saturday

Saturday: Partly Sunny then Slight Chance Showers And Thunderstorms
Partly Sunny then Slight Chance Showers And T-Storms
Sunday

Sunday: Slight Chance Rain Showers then Chance Showers And Thunderstorms
Slight Chance Rain Showers then Chance Showers And T-Storms
Memorial
Day
Memorial Day: Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Chance Showers And T-Storms then Slight Chance Showers And T-Storms
Tuesday

Tuesday: Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Chance Showers And T-Storms then Slight Chance Showers And T-Storms
Wednesday

Wednesday: Mostly Sunny
Mostly Sunny
Thursday

Thursday: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Friday

Friday: Slight Chance Showers And Thunderstorms then Mostly Sunny
Slight Chance Showers And T-Storms then Mostly Sunny
  Hi 79 °F Hi 89 °F Hi 82 °F Hi 88 °F Hi 92 °F Hi 88 °F Hi 80 °F
 
Tonight

Tonight: Mostly Cloudy
Mostly Cloudy
Saturday
Night
Saturday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Sunday
Night
Sunday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Monday
Night
Monday Night: Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms then Chance Showers And T-Storms
Tuesday
Night
Tuesday Night: Slight Chance Showers And Thunderstorms then Partly Cloudy
Slight Chance Showers And T-Storms then Partly Cloudy
Wednesday
Night
Wednesday Night: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Thursday
Night
Thursday Night: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
 
Lo 62 °F Lo 67 °F Lo 68 °F Lo 66 °F Lo 71 °F Lo 71 °F Lo 64 °F  

 

Tonight
 
Mostly cloudy, with a low around 62. Northeast wind 3 to 7 mph.
Saturday
 
A slight chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 79. Southeast wind 3 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Saturday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South wind 5 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Sunday
 
A slight chance of rain showers before 8am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 89. West wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Sunday Night
 
A chance of showers and thunderstorms before 2am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Northwest wind 3 to 9 mph. Chance of precipitation is 30%.
Memorial Day
 
A chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 30%.
Monday Night
 
A slight chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Tuesday
 
A chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 88. Chance of precipitation is 30%.
Tuesday Night
 
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 71.
Wednesday
 
Mostly sunny, with a high near 92.
Wednesday Night
 
A slight chance of showers and thunderstorms after 8pm. Partly cloudy, with a low around 71.
Thursday
 
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Thursday Night
 
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Friday
 
A slight chance of showers and thunderstorms before 8am. Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Arbutus, MD.