10:05 a.m. — Winds howling east of Washington to 40 to 60 mph as rains continue. Earlier tornado confirmed in Calvert County.
As moderate to heavy rain continues throughout the region, winds are picking up along and especially east of Interstate 95.
Reagan National Airport has seen gusts top 30 mph, Annapolis clocked a 45 mph gust, while Ocean City, Md recently gusted to 61 mph. The storm is centered just 45 miles south-southeast of Annapolis and is racing north at 35 mph. Patuxent River, Md. recently clocked a gust to 58 mph. Winds will peak in our region over the next hour or so.
Because the storm is moving so fast, we’re only expecting another hour or two of rain in the immediate Washington area, but we’re seeing a lot of area impacts continue, including:
- High water along Prince George’s County MD 201, with two lanes closed
- A tree down on a car in Tuckerman Lane in Montgomery County
- Confirmed tornado damage in Calvert County south of Chesapeake Beach, with multiple trees down
9:05 a.m. — Flood warnings expanded and cover much of immediate area.
The hardest hit areas have been east and especially southeast of the Beltway. Several reports of flash flooding have come in from southern Maryland, especially in southern Calvert and St. Mary’s counties where to 6 to 7 inches of rain had fallen.
“The stream gauge on Saint Marys River at Great Mills is above moderate flood, still rising, and at the highest level recorded since Irene in 2011,” the Weather Service wrote.
Along and near Interstate 95, rainfall totals of 1 to 3 inches were widespread, while they increased to 3 to 7 inches to the east. Reagan National Airport picked up 0.89 inches in the last hour pushing its storm total to 2.9 inches. The National Weather Service reported 1 to 1.5 feet of water on the outer loop of the Beltway at Colesville Rd.
Meanwhile, some minor coastal flooding has occurred from the storm-driven rise in water up the Potomac River in Old Town, Alexandria.
8:30 a.m. — Winds pick up as deluge continues. Damage from tornado activity in Southern Maryland and Delmarva.
At 8 a.m. wind were gusting over 20 mph along the Interstate 95 corridor, and over 30 mph to the east. Reagan National Airport and Fredericksburg reported gusts to 26 and 28 mph, while Patuxent River, Md. gusted to 45 mph.
Winds are forecast to peak around 10 a.m. with gusts to 30 to 40 mph along I-95 and and perhaps over 60 mph near the Bay.
The National Weather Service has file wind damage reports from tornado activity in southern St. Mary’s County to the south of Leonardtown and northwest of Lexington Park with many trees down and damage to a home. Over the Bay Bridge, in Queenstown, the Weather Service reports “multiple eyewitness reports” of a tornado and an overturned vehicle.
8:00 a.m. — Flood warning for areas southeast of District until 11:30 a.m.; flood warning for Fairfax County until 1 p.m. with torrential rain falling.
Extremely heavy rain continues to sweep through the Washington metro region, the heaviest east and southeast of the District where a flash flood warning was issued over a large area, including south central Anne Arundel, northwest Calvert, Prince George’s, and northeastern Charles County. Up to two inches has fallen in this area with rainfall rates of one to two inches an hour expected for the next hour or maybe longer.
The Weather Service cautions these rains will cause “life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses.”
A flood warning was also issued for Fairfax County including Falls Church, Arlington and Alexandria given the ongoing rain. Through 8 a.m., Reagan National Airport had picked up 1.69 inches of rain since Monday afternoon, most of it (1.21 inches) falling in last six hours.
7:45 a.m. — Tornado warning for southeast Prince George’s and northwest Calvert County until 8:15 a.m. Storm has a history of producing wind damage near Huntington.
7:25 a.m. — Tornado warning for northern Calvert and Southern Anne Arundel County until 7:45 a.m.
7:00 a.m. — Very heavy rain drenching region, tornado watch along Bay and over Delmarva. Tornado warning in St. Mary’s County for confirmed tornado near Leonardtown until 7:15 a.m.
Radar shows heavy rain soaking the entire region as Tropical Storm Isaias races northward near the Virginia/North Carolina border. Reagan National Airport, through 6 a.m., had already picked up over an inch of rain including the showers and storms on Monday.
Heavy rain is likely to continue through the morning, tapering off by between midday and midafternoon. With the rainfall increasing, we expect flood warnings will be issued for parts of the region, especially areas near streams and creeks.
Winds at the moment are light in the region but will pick up as the core of Isaias closes in between around 8 a.m. and midday. Gusts over 40 mph are possible along the Interstate 95 corridor and over 50 mph near the Bay.
In the very eastern part of our region, a tornado watch was issued until noon and brief twisters are not out of the question mainly near the Bay and over the Delmarva. A tornado warning was issued for southern Calvert County until 7:15 a.m., including Lexington Park which was canceled. However, a second tornado warning in northwest St. Mary’s County, in effect until 7:15 a.m., indicated a confirmed tornado over Leonardtown. Seek shelter in an interior room at the lowest level if you’re in this area.
Detailed forecast
Today’s daily digit
A somewhat subjective rating of the day’s weather, on a scale of 0 to 10.
1/10: Very unpleasant morning through midday as Isaias barrels our way.
Express forecast
- Today: Heavy rains and windy, partial clearing in the afternoon. Highs: 78-82.
- Tonight: Partly cloudy, isolated storm chance. Lows: 65-72.
- Tomorrow: Partly sunny, scattered p.m. storms. Highs: 85-89.
Forecast in detail
Isaias charges through the region this morning, setting off strong winds and heavy rains through at least the midday hours. Flooding is likely in some areas before the rain quickly cuts off during the afternoon. The rest of the forecast period through the weekend generally runs partly sunny and moderately humid with daily thunderstorm chances.
Today (Tuesday): Heavy rain with occasional thunderstorms and gusty winds are likely this morning into early afternoon. Watch for localized flooding problems, particularly in poor drainage and low-lying areas and near creeks and streams. If you encounter a flooded roadway, turn around, don’t drown.
Rains may total another two to four inches on top of what fell overnight. Wind gusts may top 40 mph for a brief time in the immediate area and 50 mph near the Chesapeake Bay. Scattered power outages are possible, especially east of Washington.
Rain and winds start to ease by early to mid-afternoon, with even some partial sunshine possible late this afternoon and evening when highs reach the upper 70s to low 80s as we start to dry out. Confidence: Medium-High
Tonight: Partly cloudy with a small chance of an isolated shower or thunderstorm as lows range from the mid-60s to low 70s. Light winds from the southwest at 5 to 10 mph. Confidence: High
Follow us on Facebook, Twitter, and Instagram for the latest weather updates. Keep reading for the forecast through the weekend...
Tomorrow (Wednesday): Partly to mostly sunny with scattered afternoon to evening thunderstorms. Highs in the mid- to upper 80s with moderate humidity levels (mid- to upper 60s dew points). Light breezes from the west around 5 mph. Confidence: Medium-High
Tomorrow night: Partly cloudy and muggy with lows in the upper 60s to the mid-70s. Light winds again. Confidence: High
A look ahead
Thursday should see partly sunny skies with highs ranging through the mid-80s with moderate humidity and scattered afternoon to evening showers and thunderstorms. Thursday night could see some evening showers or storms, with partly cloudy skies overnight and lows ranging from the mid-60s to low 70s. Confidence: Medium
Friday brings an increased likelihood of afternoon to evening thunderstorms, but skies should be partly sunny most of the day beforehand with highs again in the mid-80s, along with moderate humidity. Lingering showers and storms Friday night lead to mainly partly cloudy skies later at night, with lows in the upper 60s to mid-70s. Confidence: Medium
Our weekend is looking somewhat better with partly to mostly sunny skies, highs in the mid- to upper 80s, still some moderate humidity (dew points mid- to upper 60s), and again a shot at typical summertime scattered late-afternoon to evening thunderstorms. Saturday night should be partly cloudy, with lows in the warm upper 60s to mid-70s. Confidence: Medium
August 04, 2020 at 09:09PM
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Updates: Tropical storm conditions with flooding rain and high winds - The Washington Post
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