May Discobs 2026

[scope1]

Been pouring for the past 2-3 hours

[WxUSAF]

It’s poured all night. Got to be over 4” total since Wednesday.

[Jeff B]

5/20 - 0.80”
5/21 - 0.33”
5/22 - 0.66”
5/23 - 0.90”
5/24 (as of 6am) - 0.60”

Total: 3.29” here in Greenspring Valley

[aldie 22]

I figured everything would move east keeping my overall totals down. 2.75" of very beneficial rain...today looks pretty ok and models have backed off for my area tomorrow so maybe a burger is in my future 

[BlizzardNole]

I wonder why the heavier rain never shifted south?  I've gotten over an inch which is great, but I'm jealous of all the 3-inch-plus amounts.  I've never seen more than just light rain, not even moderate.

Edit:  LWX disco says rain chances Monday and Tuesday should be focused south of I-66 and Rt 50, so maybe that will finally be our turn.  

[AnEndlessMaze]

Event total since Wednesday is 3.76” now.

[Herb@MAWS]

imby Columbia:

12 hrs Sat 7pm - Sun 7am = 1.21”

Event total 5/20 thru Sunday 5/24 @ 7am — 4.74”

May total so far:   5.90” with moderate rain continuing. 

[wxdude64]

Set a second 'cool max' in a row, high was 55.5 degrees, which breaks last year's mark of 59.8 degrees. Only 0.11" in gauge, and around 1.25" has fell since event started, but I will take over the dryness we've had last few months. 

[CAPE]

Getting some decent rain here the past few hours, moderate to heavy at times. Finally over an inch.

Much of today and tonight looks fairly rain free. Good time to pull some weeds.

[Mrs.J]

5/20 .49”

5/21 .53”

5/22 1.17”

5/23 1.19”

5/24 .23” as of now

Event total 3.62” with a current month total of 4.73”. 

[snowfan]

BWI reporting over an inch from the overnight rain.

[mappy]

5/20: .55”

5/21: 1.09”

5/22: .44”

5/23: 1.11”

5/24: .65” as of 8am

total: 3.84”

[George BM]

3.95" of rain here since Wednesday.

4.96" for May so far.

(Herndon, VA)

[nw baltimore wx]

1.80” daily, 4.05” for the event, and 4.93” for May.

[MN Transplant]

Finally got to the saturated soil phase with the rain overnight. Here are the CoCoRahs stations with a report for every day this past week.  A good soak for many of us, but to the southeast is still hurting.

 

[MN Transplant]

On 5/23/2026 at 12:01 AM, wxmeddler said:

Correct, but it highly depends on the soil characteristics. The measurement here is Volumetric Water Content (WVC).

Soil is made out of Soil, Air, and Water. The balance of which changes with precipitation and temperature. The soil fraction remains constant, usually between 50 and 60%. It is soil after all. The rest is either microscopic air pockets or water. The air pockets are just void spaces which water could occupy. When there are no air pockets left. It’s just soil and water which of course is called Mud.

A VWC of .4 means it’s 40% water, which means that there likely isn’t much air left. This indicates that the soil can’t take much more water, and will start to run off into streams.

The VWC in which that happens varies. Sand for example saturates as low as .2 while Clay can go to .5 or even slightly higher. It just depends on the soil present. 

We’re gathering data to try to estimate/ establish the thresholds not only each location but also each depth. In the future we hope to have some sort of parameter that goes from 0-100, so there isn’t the VWC guesswork of saturation.

And going back to meddler's excellent post, here are the current soil moisture readings at 10cm depth.

 

 

[CAPE]

1.24" for the event (that really didn't begin here until yesterday)

Tomorrow looks like the best chance for additional rain.

[Eskimo Joe]

10 minutes ago, MN Transplant said:

And going back to meddler's excellent post, here are the current soil moisture readings at 10cm depth.

 

Those VWC number are money. Rock Creek is currently experiencing some flooding near the beltway. We've close down Beach Driver between Connecticut Ave & Stoneybrook Dr. Looks like 1.5" - 2.2" from Potomac to Layhill overnight.

[dailylurker]

It looks like we finally got some decent rain early this morning. The creeks are flowing again and the wetlands are wet again.