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: 4:31 am EDT Jul 16, 2019

Halethorpe, MD
 
Today

Today: Scattered showers and thunderstorms, mainly after 4pm.  Partly sunny, with a high near 93. Calm wind becoming southwest around 5 mph in the afternoon.  Chance of precipitation is 30%.
Mostly Sunny
then
Scattered
T-storms
Tonight

Tonight: Scattered showers and thunderstorms before 11pm.  Mostly cloudy, with a low around 75. Light south wind.  Chance of precipitation is 30%.
Scattered
T-storms then
Mostly Cloudy
Wednesday

Wednesday: A chance of showers and thunderstorms, mainly after 2pm.  Partly sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 3 to 8 mph.  Chance of precipitation is 50%.
Partly Sunny
then Chance
T-storms
Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 77. South wind 5 to 7 mph becoming calm  after midnight.  Chance of precipitation is 50%.
Chance
T-storms

Thursday

Thursday: A chance of showers and thunderstorms.  Mostly cloudy, with a high near 92. West wind 3 to 6 mph.  Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
Thursday
Night
Thursday Night: A chance of thunderstorms before 8pm.  Partly cloudy, with a low around 76. Chance of precipitation is 30%.
Chance
T-storms then
Partly Cloudy
Friday

Friday: Mostly sunny and hot, with a high near 98.
Hot

Friday
Night
Friday Night: Partly cloudy, with a low around 79.
Partly Cloudy

Saturday

Saturday: Mostly sunny and hot, with a high near 99.
Hot

Hi 93 °F Lo 75 °F Hi 97 °F Lo 77 °F Hi 92 °F Lo 76 °F Hi 98 °F Lo 79 °F Hi 99 °F

Hazardous Weather Outlook
 

Today
 
Scattered showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 93. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%.
Tonight
 
Scattered showers and thunderstorms before 11pm. Mostly cloudy, with a low around 75. Light south wind. Chance of precipitation is 30%.
Wednesday
 
A chance of showers and thunderstorms, mainly after 2pm. Partly sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 3 to 8 mph. Chance of precipitation is 50%.
Wednesday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 77. South wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 50%.
Thursday
 
A chance of showers and thunderstorms. Mostly cloudy, with a high near 92. West wind 3 to 6 mph. Chance of precipitation is 50%.
Thursday Night
 
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 30%.
Friday
 
Mostly sunny and hot, with a high near 98.
Friday Night
 
Partly cloudy, with a low around 79.
Saturday
 
Mostly sunny and hot, with a high near 99.
Saturday Night
 
Partly cloudy, with a low around 79.
Sunday
 
Partly sunny and hot, with a high near 98.
Sunday Night
 
Mostly cloudy, with a low around 78.
Monday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 94. Chance of precipitation is 50%.

 

Forecast from NOAA-NWS for Halethorpe MD.

National Weather Service Forecast for: Arbutus, MD
Issued by: National Weather Service Baltimore/Washington
Updated: Tue, 16-Jul-2019 4:31am EDT

Halethorpe, MD
 
Today

Today: Partly Sunny then Scattered Showers And Thunderstorms
Partly Sunny then Scattered Showers And T-Storms
Wednesday

Wednesday: Partly Sunny then Chance Showers And Thunderstorms
Partly Sunny then Chance Showers And T-Storms
Thursday

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

Friday: Mostly Sunny
Mostly Sunny
Saturday

Saturday: Mostly Sunny
Mostly Sunny
Sunday

Sunday: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Monday

Monday: Chance Showers And Thunderstorms
Chance Showers And T-Storms
 
Hi 93 °F Hi 97 °F Hi 92 °F Hi 98 °F Hi 99 °F Hi 98 °F Hi 94 °F  
 
Tonight

Tonight: Scattered Showers And Thunderstorms then Mostly Cloudy
Scattered Showers And T-Storms then Mostly Cloudy
Wednesday
Night
Wednesday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Thursday
Night
Thursday Night: Chance Showers And Thunderstorms then Partly Cloudy
Chance Showers And T-Storms then Partly Cloudy
Friday
Night
Friday Night: Partly Cloudy
Partly Cloudy
Saturday
Night
Saturday Night: Partly Cloudy
Partly Cloudy
Sunday
Night
Sunday Night: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Monday
Night
Monday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
 
Lo 75 °F Lo 77 °F Lo 76 °F Lo 79 °F Lo 79 °F Lo 78 °F Lo 72 °F  

 

Today
 
Scattered showers and thunderstorms after 2pm. Partly sunny, with a high near 93. Southwest wind 1 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Tonight
 
Scattered showers and thunderstorms before 8pm, then scattered showers and thunderstorms between 8pm and 11pm. Mostly cloudy, with a low around 75. South wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
 
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 97. Heat index values as high as 105. Southwest wind 2 to 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Wednesday Night
 
A chance of showers and thunderstorms before 2am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Heat index values as high as 103. Southwest wind 2 to 7 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Thursday
 
A chance of showers and thunderstorms before 2pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 92. Southwest wind around 6 mph. Chance of precipitation is 50%.
Thursday Night
 
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 50%.
Friday
 
Mostly sunny, with a high near 98.
Friday Night
 
Partly cloudy, with a low around 79.
Saturday
 
Mostly sunny, with a high near 99.
Saturday Night
 
Partly cloudy, with a low around 79.
Sunday
 
A slight chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 98.
Sunday Night
 
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 78.
Monday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 94. Chance of precipitation is 50%.
Monday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Chance of precipitation is 50%.

 

Forecast from NOAA-NWS for Arbutus, MD.