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Posted at 5:10 PM ET, 09/ 4/2008

PM Update: Still Hot as Hanna Moves Closer

By Ian Livingston

Increasing chance of rain Friday

*5 p.m. update: Tropical Storm Watch in effect for Washington, D.C., Tidal Potomac, Chesapeake and Delaware Bay, and Va./Md./De. beaches*

*Flash Flood Watch in effect for entire metro area. Potential for 3-6" of rain Saturday morning through afternoon.*

A south wind has funneled in increasing levels of humidity today, and combined with high heat, it's feeling like the dog days of summer here in September. High temperatures in the low and mid 90s are running about 10 degrees above average, but fortunately the intense heat breaks tomorrow, as the first signs of Hanna, currently a tropical storm, begin to arrive in the area.

Tonight: Mostly clear skies continue tonight along with muggy conditions. Expect readings to only fall into the mid 70s in the city and around 70 in the suburbs.

Tomorrow: After starting mostly sunny, clouds will be on the increase during the middle of Friday as Hanna nears the Southeast coast. By late afternoon, the first showers or thundershowers associated with the outskirts of the tropical system may begin arriving from the south and east. Prior to any showers or storms, highs will reach the mid and upper 80s. Friday night, steadier and heavier rains become more likely along with increasingly breezy conditions as the storm center approaches.

Hanna: At 2 p.m., Hanna was located near the Bahamas and moving northwest at 14 mph. The storm is expected to make landfall in North Carolina prior to sunrise on Saturday before moving up the coast to a position east of the area around midday. It still appears that at least part of the region will see significant rainfall and moderate winds (the greatest chances for both are currently from I-95 and to the east). A state of emergency has been declared in Virginia as the state braces for the storm.

See Josh's full forecast through the weekend, and check back in later this evening for a full update on Hanna.

By Ian Livingston  | September 4, 2008; 5:10 PM ET
Categories:  Forecasts  
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Next: Hanna to Pack a Punch for Metro Area


The first rogue outer thundershowers from Hanna are moving on-shore. Around West Palm Beach FL.

Also interesting:
What is the dewpoint in Miami right now? 60F.
What is DC's current dewpoint? 65F.
We are more moist and humid-feeling than Miami--which is relatively close-in to a tropical storm at the moment!

Posted by: Camden, Capital Weather Gang | September 4, 2008 3:53 PM | Report abuse

I could be wrong about this, but I understand that the sinking air near (but not too near) a tropical system can actually be quite dry.

Posted by: Ray Warren | September 4, 2008 4:00 PM | Report abuse

Sterling NWS office says its "best guess" right now is 4-8 inches Saturday. I assume D.C. environs will be closer to 4 inches, but that's a lot of rain for a fast-moving system.

Posted by: jmbethesda | September 4, 2008 4:03 PM | Report abuse

Many afternoon models have trended back a bit west, probably partly due to the fact that there has been a fair amount (more than NHC expected) of westward movement with the storm the last few hours.

Posted by: Ian, Capital Weather Gang | September 4, 2008 4:10 PM | Report abuse

should i cancel the uhaul and order a small boat for my move on saturday?

Posted by: dave | September 4, 2008 4:29 PM | Report abuse

"Dulles Day" is on Saturday, and I'm beginning to wonder if it would be that good a day to go. Shame if I had to miss it!

Posted by: mcleaNed | September 4, 2008 4:41 PM | Report abuse

Whoa, dave, you're moving on Saturday? I'm so sorry...

Posted by: Laura in NWDC | September 4, 2008 4:49 PM | Report abuse

What do we think the odds are of a 6:40 PM flight out of BWI on Saturday being on time? I'm guessing not so much, if Hanna is sitting directly over the Eastern Shore at that instant.

Those of you who follow this stuff more closely, do I have any reason to hope an on time departure is possible? It is the last flight of the day, with a tight connection in the mid-west....

Posted by: Deep Fried Screech | September 4, 2008 4:50 PM | Report abuse



Posted by: weatherdudeVA | September 4, 2008 5:06 PM | Report abuse

The new NHC track followed model trends and has shifted west a bit as well. Hanna is no longer expected to reach hurricane status before landfall.

Posted by: Ian, Capital Weather Gang | September 4, 2008 5:14 PM | Report abuse

National tied a record high today with 95 degrees for the second day in a row.

Posted by: Ian, Capital Weather Gang | September 4, 2008 5:26 PM | Report abuse

it should be an easy move. one small uhaul. or a small tug boat. two years ago, i moved right before we had 7 or 8 inches of rain in two days in DC (remember that? it was mid july, i think?)

Posted by: dave | September 4, 2008 6:21 PM | Report abuse

Bring it on! We need the rain!

Does drought make any of you other weather-obsessed comrades anxious? In 1967-68, Massachusetts was suffering from a severe drought. Apparently, as an 8 year-old, I was so anxious about this that my parents drove me 90 miles to Quabbin Reservoir, the source of suburban Boston's water supply, to prove that we were not going to run out of water! To this day, I dread drought. Don't disappoint my three rain gauges, Hanna!

Posted by: Tom from Michigan Park, DC | September 4, 2008 6:23 PM | Report abuse

Shifting West....uggghhhh! A slight wind gust and power is typically out in Leesburg for days.

Posted by: Greg | September 4, 2008 6:31 PM | Report abuse

Governor Kaine has declared an emergency for Virginia. Ike Leggett has put the emergency system on stand by for Montgomery County. Has DC done anything in prep or are they just going to wait until after the problems occur to react?

Posted by: ep | September 4, 2008 6:41 PM | Report abuse

Camden, Washington has one of the highest design wet bulbs in the nation. Right up there with Houston, and of all places, St. Louis.

Posted by: Uncle Dak | September 4, 2008 6:42 PM | Report abuse

No dances affected, thank heavens, only a 5 PM Buddhist meeting on Saturday! [I can cancel plans and go Sunday.]

Tuesday's dance-night frontal passage poses more of a lightning risk.

Posted by: El Bombo | September 4, 2008 6:45 PM | Report abuse

Do we need to worry about storm surge like what we had with Isabel?

Posted by: mdsailor | September 4, 2008 6:49 PM | Report abuse

Dave: Do you happen to remember the 13 inches of rain we got in June 2006?

Posted by: mcleaNed | September 4, 2008 7:04 PM | Report abuse

The 13 inches was intense... I couldn't get home-Bethesda Fire and Rescue were doing water rescues on the streets leading to either end of my block, with the water on Ridgefield Road up to the roofs of people's cars. I've never seen anything like that in person before or since.

Posted by: Anonymous | September 4, 2008 7:14 PM | Report abuse

this is horrible stop this storm immediatly........ is it going to hit Virgina??

Posted by: anoumonous | September 5, 2008 5:13 PM | Report abuse

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