Weather Blog: Arthur and the "Omega Block"

Posted at 8:45 AM, May 17, 2020
and last updated 2020-05-17 09:56:26-04

Good Sunday bloggers,

Hurricane season officially begins June 1st, but mother nature has other plans. The first named storm of the season, Arthur, has formed east of Florida and will likely affect the eastern sections of the Carolina's with wind and rain. North Carolina will be impacted the most. Fortunately, Arthur will remain a tropical storm as it tracks out in to the Atlantic Ocean this week.

We are dealing with an upper level pattern knows as an "Omega Block." We talked about this yesterday. The upper level flow will take the shape of the Greek letter omega. The block means that this configuration can last 3-8 days. We are going to get the shorter version.

If you are near the upper level low's you get several days in a row with good chances of precipitation. If you are near the upper level high, you get several days of dry and mostly decent weather. Our region is near the upper level high.


The block breaks down at the end of the week and this will open the door for rain and thunderstorm chances. The potential is there for quite a bit of rain during the last 10 days of May. We will see how this looks in a few days.


The weather through the week, due to the block, will feature rain and mountain snow across the Pacific Northwest. Wind and rain will occur in the eastern USA regardless of Arthur. The middle 1/3 of the USA will see some nice weather. By Wednesday, some thunderstorms will start to form in the high plains. They will fall apart as they move east. They will start to make it farther east by Friday-Saturday. Our next chance of rain and thunderstorms will be Friday and/or Saturday.


SUNDAY: This afternoon will be nice, however it will be a bit windy with lots of clouds. It will be comfortable with highs 65-70. The wind will come in from the northwest at 15-25 mph.


MONDAY: The eastern low of the "Omega Block" is going to end up close enough that we will get many periods of clouds from the north and northeast. This will keep our highs in the 60s. The western Plains will be out of the cloud circulation allowing their temperatures to reach the 70s and 80s.


TUESDAY: Since we are in a blocking pattern, it means the weather will change little from day to day until the block breaks. So, Tuesday and Wednesday will be similar to Monday. The clouds will hang tough with highs in the 60s, while 70s/80s occur in the western Plains under abundant sunshine. Thursday and Friday will see more sun, but remember by Friday here come the thunderstorm chances.

So, overall the weather will be nice and comfortable this week, just not a ton of sun. If you need rain on your yard or farm, either water or wait until the end of the week and weekend.


Have a great week and stay healthy.