Only Some Get Brief Heat Relief With Evening Storms

July 20 2020

This is the second day in a row with temperatures reaching 100ºF. Many would welcome a thunderstorm to relieve the heat and humidity, but only a lucky few will get it. Despite the extreme conditions, the atmosphere is mostly stable.

Check out the temperatures this afternoon. You can see some 80s where storms have cooled things down, but those spots are few and far between.

Temperatures

At 5 PM BWI reported 100ºF with a dew point of 70ºF. The Heat Index was 108ºF

There is one weakness in the atmosphere that has flared up this afternoon. But only long this line is the best chance to get some action, and the time window is pretty small.

Storm Development:

Satellite Loop

Here is a look at the satellite loop showing the limits cloud development today. This is about 3 hours through 4:36 PM

Doppler Radar:

Here is the same time frame showing the storm development on radar. There is a disturbance in the mountains, but the west winds rips it apart downscoping to the east. But one other lucky cluster on the west side of Washington DC.

Doppler Radar Snapshot at 5 PM

This is the best nowcast indicator. The storms are a little north of the model plots below. Montgomery County and across western and northern Washington DC are in the path.

Nowcasting:

Note: This may be locally strong, but only provide quick relief.

The best chance for storms will be in metro Washington DC through 7 PM.

This may clip Columbia and Laurel on the north end, then Glen Burnie and Pasadena in AACo still on the edge of a hit or miss.

The main line should travel through PG County and Rt 50 to the east. It’s likely to fade a little near I-97, Annapolis, and the Bay. But some clouds and cooler will help through 8 PM.

Radar Simulations

These two models do agree on plotting the cluster near Washington, DC but fading as it reaches Anne Arundel County. So Annapolis will be about 50% to get something. Less likely crossing the Bay. Little to no chance this time farther north near Baltimore and southern PA.

NAM 3 Km Model —> slider

HRRR Model –> slider

Heat Advisory and Excessive Heat Warning

Records?

That will be tough to challenge with some of the hottest already set on those days


July 20    102ºF in 1930    
July 21    104ºF in 1930   
July 22    106ºF in 2011   
July 23    102ºF in 2011+

Climate Report Today

Record Rainfall set in Baltimore at BWI

See the Weather Observations and Climate Report from this morning for more info about:

📋Observations yesterday

🌡 Climate data today

🗺 Weather Map

☀️ Sunrise and sunset times

🌙 Moon phase

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Also See:

Comet NEOWISE Viewing All July (photos/video)

Maryland Strong Love ❤️

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Also See:

Video Collage of Blue Angels and Thunderbirds Flyover Saturday

Double Solar Halo

Derecho Crosses PA and NJ June 3: Full Radar Loop

New Video Series: What is this cloud?

Episode 3: Morning Glory at sunrise on the beach in North Carolina

Atlantic Tropical History: Maps of Origin Regions Every 10 Days

Atmospheric Memory Of Hurricanes Over Thousands Of Years Shaped The Coast

Two Tornados Confirmed in Maryland Monday April 13

Wednesday Storms Across Maryland: Hail Video/Photos, Lightning, and Tree Damage

Water Spout OR Scud Cloud on videos and photos near Middle River Maryland

Other Links:

Was Your County Not Included?

Click this map for more on the regional forecast zones

Baltimore Weather At BWI May Not Be As Hot As Reported

Construction at the airport close to the weather station may be added artificial heat. Click here or the image for the details.

Maryland Trek Cycle Jerseys From Hill Killer

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