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: 1:31 am EDT Jul 31, 2021

Halethorpe, MD
 
Overnight

Overnight: Partly cloudy, with a low around 62. North wind around 5 mph.
Partly Cloudy

Saturday

Saturday: Partly sunny, with a high near 83. Northeast wind around 6 mph becoming west in the afternoon.
Partly Sunny

Saturday
Night
Saturday Night: A chance of showers after 2am.  Mostly cloudy, with a low around 68. Southeast wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 30%.
Mostly Cloudy
then Chance
Showers
Sunday

Sunday: A chance of showers, with thunderstorms also possible after 2pm.  Mostly cloudy, with a high near 81. Southeast wind 5 to 9 mph.  Chance of precipitation is 50%.
Chance
Showers
Sunday
Night
Sunday Night: Mostly clear, with a low around 64. Southeast wind 5 to 7 mph becoming light and variable.
Mostly Clear

Monday

Monday: Sunny, with a high near 84.
Sunny

Monday
Night
Monday Night: Partly cloudy, with a low around 64.
Partly Cloudy

Tuesday

Tuesday: A chance of showers.  Partly sunny, with a high near 83. Chance of precipitation is 30%.
Chance
Showers
Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 66.
Partly Cloudy

Lo 62 °F Hi 83 °F Lo 68 °F Hi 81 °F Lo 64 °F Hi 84 °F Lo 64 °F Hi 83 °F Lo 66 °F

 

Overnight
 
Partly cloudy, with a low around 62. North wind around 5 mph.
Saturday
 
Partly sunny, with a high near 83. Northeast wind around 6 mph becoming west in the afternoon.
Saturday Night
 
A chance of showers after 2am. Mostly cloudy, with a low around 68. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Sunday
 
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 81. Southeast wind 5 to 9 mph. Chance of precipitation is 50%.
Sunday Night
 
Mostly clear, with a low around 64. Southeast wind 5 to 7 mph becoming light and variable.
Monday
 
Sunny, with a high near 84.
Monday Night
 
Partly cloudy, with a low around 64.
Tuesday
 
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Tuesday Night
 
Partly cloudy, with a low around 66.
Wednesday
 
A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 84. Chance of precipitation is 30%.
Wednesday Night
 
A chance of thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Thursday
 
A chance of showers. Partly sunny, with a high near 85. Chance of precipitation is 30%.
Thursday Night
 
A chance of showers. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Friday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 86. 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: Sat, 31-Jul-2021 1:34am EDT

Halethorpe, MD
The detailed point forecast weather data is not currently available.
The zone forecast data for MDZ011 (Southern Baltimore) will be displayed
until the point forecast data is again available.
If this persists, contact the NWS Baltimore/Washington WFO
at (571) 888-3500 or email at lwxwebmaster@noaa.gov
to have them update the point forecast for /gridpoints/LWX/105,87 on api.weather.gov
 
  Saturday

Partly Sunny
Partly Sunny
Sunday

Chance rain
Chance rain
Monday

Sunny
Sunny
Tuesday

Chance rain
Chance rain
Wednesday

Thunder storm
Thunder storm
Thursday

Chance rain
Chance rain
Friday

Thunder storm
Thunder storm
  Hi <85°F Hi >75°F Hi <85°F Hi <85°F Hi <85°F Hi <85°F Hi ≈85°F
 
Overnight

Mostly Clear
Mostly Clear
Saturday
Night
Chance rain
Chance rain
Sunday
Night
Chance rain
Chance rain
Monday
Night
Partly Cloudy
Partly Cloudy
Tuesday
Night
Partly Cloudy
Partly Cloudy
Wednesday
Night
Partly Cloudy
Partly Cloudy
Thursday
Night
Chance rain
Chance rain
 
Lo <65°F Lo >65°F Lo <65°F Lo ≈65°F Lo ≈65°F Lo ≈65°F Lo >65°F  

 

Overnight
 
Mostly clear. Lows in the lower 60s. North winds around 5 mph.
Saturday
 
Partly sunny. Highs in the lower 80s. Northeast winds around 5 mph, becoming southwest around 5 mph in the afternoon.
Saturday Night
 
Mostly cloudy. A chance of showers after midnight. Lows in the upper 60s. Southeast winds around 5 mph. Chance of rain 30 percent.
Sunday
 
Mostly cloudy with a chance of showers. Highs in the upper 70s. Southeast winds 5 to 10 mph. Chance of rain 50 percent.
Sunday Night
 
Partly cloudy with a chance of showers in the evening, then mostly clear after midnight. Lows in the lower 60s. South winds 5 to 10 mph, becoming northwest after midnight. Chance of rain 50 percent.
Monday
 
Sunny. Highs in the lower 80s.
Monday Night
 
Partly cloudy. Lows in the mid 60s.
Tuesday
 
Partly sunny with a chance of showers. Highs in the lower 80s. Chance of rain 30 percent.
Tuesday Night
 
Partly cloudy. Lows in the mid 60s.
Wednesday
 
Mostly sunny with a chance of showers and thunderstorms. Highs in the lower 80s. Chance of rain 30 percent.
Wednesday Night
 
Partly cloudy. Lows in the mid 60s.
Thursday
 
Mostly sunny with a chance of showers. Highs in the lower 80s. Chance of rain 40 percent.
Thursday Night
 
Partly cloudy with a chance of showers. Lows in the upper 60s. Chance of rain 40 percent.
Friday
 
Partly sunny with scattered showers with a chance of thunderstorms. Highs in the mid 80s. Chance of rain 40 percent.

 

Forecast from NOAA-NWS for Arbutus, MD. (Zone forecast for Southern Baltimore)