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Posted at 9:30 AM ET, 09/30/2010

Flash flood warning extended until 12:30 p.m.

By Jason Samenow

Tornado watch until 1:00 p.m. for parts of region

* Tornado watch immediate metro area & eastern suburbs (map) *
* When does it end? Full Forecast | Share photos | Dr. Gridlock *
* Flash Flood Watch thru today | Wind Advisory (eastern counties) *
* Outside now? Radar, temperatures & more: Weather Wall *

ALERT, 9:30 A.M.: A tornado warning has been issued for east central Anne Arundel county until 10:15 a.m. Doppler radar indicated a possible tornado near South River moving north at 25 mph. Location in its path Gibson Island, Pinehurst, and Port Smallwood State Park. Take cover immediately if in this area

ALERT, 9:00 A.M.: A tornado warning has been issued for southeast Calvert county and eastern St. Mary's county until 9:45 a.m. Doppler radar indicated a possible tornado near Saint George Island moving north at 50 mph. Location in its path include St. Mary's City, Patuxent River Naval Air Station, Lusby, and Calvert Cliffs. Take cover immediately if in this area

From earlier: One to three inches (localized amounts to near 4", doppler estimate) of rain have already fallen across the metro region this morning. The heaviest rain has fallen from eastern Prince William county into central Fairfax county. At least another 1-3" is on the way as copious tropical moisture streams northward. The National Weather Service cautions:


New data indicate heavy rain may continue through the afternoon and into the evening. Rainfall may total 3-6+" by storm's end. Remember that you should never attempt to drive through flooded roadways.

As mentioned earlier, a tornado watch is also in effect and warnings have been issued in the eastern suburbs near the Bay where the risk is highest.

* Please comment with storm conditions where you live: we'd especially like rainfall totals and to know about any reports of flooding. *

By Jason Samenow  | September 30, 2010; 9:30 AM ET
Categories:  Floods, Updates  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Flash Flood Warning for entire metro region
Next: Rainfall mounts, flash flood warning continues


I'm usually commuting to Baltimore Law from Alexandria at this time- really thankful my morning class was cancelled. I know MARC is having major issues, do you guys expect more delays or Amtrak to go down too?

Posted by: MasonPatriot1 | September 30, 2010 7:36 AM | Report abuse

I've got an unofficial 4 inches in a bucket I set outside yesterday afternoon here in Oakton, VA.

Posted by: FH59312 | September 30, 2010 7:40 AM | Report abuse

Since this storm has evolved into an "inch-by-inch" system, are there any plans to post a regional map with periodicallly updated rainfall amounts at some key locations?

There was some OCM discussion about an overnight 4-plus" inches at PaxRiver, but haven't heard anything about DCA, IAD, etc. I know... first we plead for rain, and now we want it quantified.

Meanwhile, Wilmington, NC, is up to 20" of rain this week. A Floyd-style deluge!

Posted by: JerryFloyd1 | September 30, 2010 7:54 AM | Report abuse

Moisture streaming all the way from the Bahamas to Canada. All I know is it woke me up at 3am. The rain hitting my bedroom window sounded like someone filled a tennis ball machine with pebbles and aimed it at my window. PING PING PING PING PING PING PING. I had to stick wax in my ears to get any sleep.

Posted by: rwalker66 | September 30, 2010 7:59 AM | Report abuse

Flood warnings do nothing for me, I need some good high winds to get the power to go off at work.

When will those be cruising in?

**does the no-power-at-work dance in her chair at work**

But seriously folks, be careful out there, even without the winds it's awfully hinky out there.

Posted by: wadejg | September 30, 2010 8:06 AM | Report abuse

Here at the office just east of Baltimore, we've had some waves of torrential rain roll through all morning. Seems like the heaviest rain and storms are training north-south right along the western edge of the bay right now.

Posted by: marklandterrapins | September 30, 2010 8:07 AM | Report abuse

this would be a lot of snow - i wonder how much?

Posted by: jay4811 | September 30, 2010 8:09 AM | Report abuse

Silver Spring to downtown Bethesda by car was perfectly fine a half-hour ago.

Posted by: Murre | September 30, 2010 8:14 AM | Report abuse

Just light showers in South Alexandria. Commute along shoulder flooding-prone GW Parkway was just fine. Channel 4 News made the rains sound biblical this morning, but it's been very light here.

Posted by: KEBV | September 30, 2010 8:24 AM | Report abuse

Lotsa rain in Centreville. Looks like lotsa rain just about everywhere, maybe even for VATechBob.
There was about 5 inches in the rain buckets this morning. The rain did not quit all night. The local creeks are high but did not (yet) look like they were in imminent danger of flooding the road. Quite a miserable commute, however the repaving of Rt 29 seems to have solved much of the standing water issues that occured there with every heavy rainfall.
Be careful out there & give yourself extra time.

Posted by: FIREDRAGON47 | September 30, 2010 8:44 AM | Report abuse's almost certain this event would not be all snow even in the dead of winter. The lows track and the moisture feed would have turned this over to rain in no time. There are other factors to but suffice it to say we could not have a major snowstorm with the current pattern setup. If you want to dream though and act as though weather patterns and thermodyanamics have nothing to do with snow, then just multiply the amount rain we get by 10. Thus, if we get 3 inches of rain you can calculate 30 inches of snow as a general "guesstimation"

Posted by: wb1313 | September 30, 2010 8:48 AM | Report abuse

I asked this earlier but a new post went up and I don't think anyone answered ... we've had several heavy rain events this year. Does the amount of moisture in the air in the warmer months have any predictive value for winter snows?

Posted by: mhardy1 | September 30, 2010 8:51 AM | Report abuse


Not to my knowledge.

Posted by: Jason-CapitalWeatherGang | September 30, 2010 9:19 AM | Report abuse

A few very heavy bands passing through the Oakton/Fairfax area at this time. Up to 4.5" in the rain bucket.

Posted by: FH59312 | September 30, 2010 9:27 AM | Report abuse

My commute from Falls Church to Fairfax City was okay. A few spots of standing water on Lee Highway (rt. 29) but nothing frightening.

Not looking forward to the commute home, though!

Posted by: stacylane | September 30, 2010 9:28 AM | Report abuse

Looks like the western shore of the bay is getting hammered right now. Anyone in Annapolis out there with a report?

Posted by: Brian-CapitalWeatherGang | September 30, 2010 9:46 AM | Report abuse

VERY heavy rains still here in Rosedale (east of Baltimore), and now the winds are starting to pick up.

Posted by: marklandterrapins | September 30, 2010 9:50 AM | Report abuse

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