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Posted at 5:00 AM ET, 09/ 4/2008

Forecast: Heat & Humidity Precede Hanna

By Josh Larson

Wet, windy & stormy late Friday into Saturday?

Though temperatures today will be similar to yesterday's -- into the mid 90s -- the increase in humidity may well presage Tropical Storm Hanna's effects on the D.C. area beginning late Friday and lasting into Saturday. Friday's short-lived morning sunshine will hold highs below 90, but increasing afternoon clouds will give way to a potentially rainy, windy and stormy period Friday evening through Saturday (especially east of D.C.). Calmer, drier weather appears to return later in the day Sunday.

Track Hanna

TODAY (THURSDAY)

Sunny and hot. Mid 90s. Due to abundant sunshine we'll again experience afternoon highs today some 10+ degrees above average and into the mid 90s in most spots. You also may notice a modest uptick in humidity -- which will do nothing to lessen the impact of the sultry temperatures.

Tonight will feature partly cloudy skies with overnight lows ranging from the upper 60s to near 70.

Confidence: High

Keep reading for the forecast through the beginning of next week.

TOMORROW (FRIDAY)

Increasing clouds. Upper 80s. Though we may experience a fair bit of sunshine during the first part of the day Friday, it is likely that clouds will quickly overspread the area by mid-day; this will keep highs below 90. Scattered showers and thunderstorms, along with breezier conditions, may develop during the late afternoon or early evening.

You may want to stay in Friday night as showers and thunderstorms, along with potentially windy conditions, are a reasonable bet. Lows will be near 70.

A LOOK AHEAD

Though the exact track of Hanna is yet to be determined, it would be prudent to plan for potentially rainy, windy (20-40+ mph) and stormy weather during much of the day Saturday; the greatest effects will likely be to the east of DC. Thick overcast skies will hold afternoon highs in the 70s. Showers and thunderstorms may linger into the evening -- and perhaps, even overnight -- hours Saturday, with steady temperatures near 70. Confidence: Low-Medium

Mostly cloudy and breezy conditions, along with a stray shower, are probable Sunday morning. Models suggest, however, the possibility that some drier air and sunshine may infiltrate the area by the second half of the day. Conditions will probably remain on the breezy side, with afternoon highs from 80-85, depending on cloud cover. Benign weather is in store for Sunday night, with mostly clear skies and lows in the mid to upper 60s. Confidence: Medium

The outlook for Monday calls for mostly sunny and pleasant weather with temperatures right about where they should be for this time of year -- the low 80s.Confidence: Medium

By Josh Larson  | September 4, 2008; 5:00 AM ET
Categories:  Forecasts  
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Next: Hanna Struggles; Local Impacts Difficult to Pinpoint

Comments

Can you believe this heat? Only 75 degrees downtown right now. My thermometer confirms the reading overlaid on the google map, in the post below(PM update). eesh!

Posted by: Camden, Capital Weather Gang | September 4, 2008 7:32 AM | Report abuse

Seems like Hanna's projected track keeps shifting east. We could use the rain, but the 5" est. from the pqf maps is not ideal. How much rain should we anticipate in Mont. Co.? Also, will these rains be like Tropical Storm rains or more thunderstorms? Gotta clean the gutters anyway... argh.

Posted by: laytonsvilledan | September 4, 2008 7:57 AM | Report abuse

Just like you mentioned yesterday, the NWS 5am discussion metions the storm developing an extratropical nature.

Posted by: Uncle Dak | September 4, 2008 8:24 AM | Report abuse

I personally thing Hanna is going to get torn apart by Ike. Ike is a bad a** and on IR sattelite you can already see it affecting Hanna. It's southerly winds on the west side are colliding with Hanna's Northerly winds on the eastside. Ike, a decively more powerful force at the moment is pulling energy from Hanna. Unless Hanna makes up her mind and heads as fast as she can away from Ike her convection engine will not be able to retain enough energy to keep her spinning. When that happens she will break up and her energy will be absorbed by Ike.

Posted by: akmzrazor | September 4, 2008 8:31 AM | Report abuse

The track guidance has actually been pretty consistent for the last several runs, tracking Hanna between Annapolis and just offshore the Maryland/Delware beaches

It does look like a hybrid between a tropical and extratropical storm... or a subtropical storm. Right now, looks like fall noreaster type impacts... rain/gusty winds/some coastal flooding-- worst weather along and east of I-95. We'll have a post focusing on Hanna right after 11 a.m.

Posted by: Capital Weather Gang | September 4, 2008 9:47 AM | Report abuse

Here's an oddly specific request for guidance. In our old, decrepit rowhouse, it's important to be physically present for really torrential rains. (A drain outside our back door can get overwhelmed and we need to be there to minimize the water coming in under the door.) What are the odds that such rains may happen between 7PM and 10PM on Friday night? (I.e., should we cancel our babysitter and movie plans?)

Posted by: Matt | September 4, 2008 10:03 AM | Report abuse

Akmzrazor's post reminds me of Ike and Tina Turner. If Hanna breaks free of Ike's influence and becomes a successful hurricane on her own, perhaps we should rename her Tina.

Posted by: magicdomino | September 4, 2008 10:29 AM | Report abuse

A general note from the Hurricane Center's discussion on Hanna this morning: "AS ALWAYS...ONE SHOULD NOT FOCUS ON THE
EXACT FORECAST OF THE CENTER...ESPECIALLY SINCE MUCH OF THE WEATHER
ASSOCIATED WITH HANNA IS WELL-REMOVED FROM THE CENTER."

Posted by: Andrew Freedman, Capital Weather Gang | September 4, 2008 10:40 AM | Report abuse

Anyone want to speculate on the effects of Hanna in Charlottesville for a 3:45pm kickoff of UVA vs. Richmond...would appreciate Capital Weather input. Thanks!

Posted by: TD | September 4, 2008 10:46 AM | Report abuse

TD: re UVA vs. Richmond, please see: www.thesabre.com/weather

Posted by: Capital Weather Gang | September 4, 2008 1:40 PM | Report abuse

The comments to this entry are closed.

 
 
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