arlwx12

Plus frost advisories for west of the immediate DC/Baltimore beltways and southern Potomac River. National Weather Service Baltimore MD/Washington DC 150 PM EDT Sun Oct 18 2026 MDZ006-503>507-VAZ038>040-050-053-506-526-527-190200- /O.NEW.KLWX.FR.Y.0010.261019T0500Z-261019T1300Z/ Northern Baltimore-Northwest Montgomery-Central and Southeast Montgomery-Northwest Howard-Central and Southeast Howard- Northwest Harford-Greene-Madison-Rappahannock-Orange-Fairfax- Eastern Loudoun-Northwest Prince William-Central and Southeast Prince William/Manassas/Manassas Park- Including the cities of Clarksville, Bynum, Reston, Poplar Springs, Castleton, Bel Air, Montclair, Madison Run, McLean, Orange, Woolsey, Everona, Countryside, Owings Mills, Haymarket, Glyndon, Dayton, Dale City, Timonium, Burr Hill, Sterling Park, Reisterstown, Twymans Mill, Hickory, Historic Ellicott City, Fairfax Station, Glenwood, Glenelg, Lake Ridge, Dulles International Airport, Rockville, Watersville, Hackleys Crossroads, Manassas, Randallstown, Boyds, Fordsville, Leesburg, Aden, Simpsonville, Woodstock, Gleedsville, Woodbridge, Cockeysville, Oak Grove, Columbia, Burke, Silver Spring, Washington, Bethesda, Chantilly, Independent Hill, Lahore, Gaithersburg, Four Corners, Flint Hill, Glenmont, Five Forks, Madison Mills, Rock Mills, Long Green, Germantown, Nasons, Unionville, Lisbon, Shady Grove, Fallston, Aspen Hill, West Friendship, Langley, and Annandale 150 PM EDT Sun Oct 18 2026 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM EDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of central and northern Maryland and central and northern Virginia. * WHEN...From 1 AM to 9 AM EDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Freeze warnings back up for some areas just east of the Blue Ridge. National Weather Service Baltimore MD/Washington DC 150 PM EDT Sun Oct 18 2026 MDZ004-005-VAZ051-501-502-505-190200- /O.NEW.KLWX.FZ.W.0008.261019T0500Z-261019T1300Z/ Frederick-Carroll-Culpeper-Northern Fauquier-Southern Fauquier- Western Loudoun- Including the cities of Bethel, Eldersburg, Lucketts, Rapidan, Westminster, Stevensburg, Buckeystown, Gamber, Turnbull, Catalpa, Park Mills, Airlie, Reva, Warrenton, Ballenger Creek, Cardova, Culpeper, Frederick, and Winston 150 PM EDT Sun Oct 18 2026 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM EDT MONDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...In Maryland, Carroll and Frederick Counties. In Virginia, Culpeper, Fauquier, and Western Loudoun Counties. * WHEN...From 1 AM to 9 AM EDT Monday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Expect the coldest temperatures in valleys and other low lying areas. (snip)

NWS indicates some bigger spots, such as Winchester, Cumberland and Martinsburg all got below freezing.

First, thunderstorm chances from the north/central Shenandoah Valley on east WWA Summary for Severe Thunderstorm Watch Issued by LWX Then, freeze watches for Sunday morning from outer Baltimore/Frederick (MD)/Loudoun and on west. WWA Summary for Freeze Watch Issued by LWX Whiplash.

I wouldn't be too surprised if LWX calls DCA/IAD/BWI as 89/89/87 as the highs of the day appear to have just missed 90/90/88. Still daily records, though.

From WJLA: Boy rescued after large tree crashes into Prince George's County home

FInally got my power back in Arlington about an hour ago. Some tree debris got wedged in front of my vehicle on the street. Some refuse carts got blown over ((don't know if the ones upright are because people fixed that before heading for work)).

Special Marine Warning National Weather Service Baltimore MD/Washington DC 115 PM EDT Wed Sep 2 2026 The National Weather Service in Sterling Virginia has issued a * Special Marine Warning for... Tidal Potomac from Indian Head to Cobb Island MD... Tidal Potomac from Key Bridge to Indian Head MD... * Until 315 PM EDT. * At 114 PM EDT, strong thunderstorms were located along a line extending from near Fort Smallwood State Park to 16 nm north of Key Bridge to 24 nm northwest of Tidal Basin to 31 nm northwest of Reagan National Airport, moving south at 25 knots. HAZARD...Wind gusts 34 knots or greater.

That was an intense little burst near DCA. DCA recorded a wind gust of 53 mph and .40 of rain in 6 minutes, as visibility shot down to 1/4 mile. edit: then it picked up another .40 of rain in 8 minutes. Pity it couldn't have been a soaking rain to help out better with the drought.

Weather radio just announced a severe thunderstorm warning for SE Arl/SE DC. Storm said to be over Alexandria.

Really pouring down near DCA, visibiliity under 1/4 mile.

Haze showing up at DCA. Current DC air quality listed as 62 (moderate). NWS forecasts air quality to worsen today... ...AIR QUALITY ALERT IS IN EFFECT FOR THURSDAY JULY 16 2026... The Metropolitan Washington Council of Governments and District Department of Environment has issued a Code ORANGE Air Quality Alert Thursday for the District of Columbia. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. (snip)

Dulles still in the running for warm low for date. BWI just missed.

At least the DC area air quality is not that of Detroit... Detroit registers worst air quality in the world among major cities as wildfire smoke blankets Michigan DETROIT, Mich. (News 10) - Heavy wildfire smoke from Canada and Minnesota continues to settle into Lower Michigan, causing Detroit to have the worst air quality in the world among major cities Thursday morning. Detroit’s air quality index (AQI) was rated at 684 as of 3:30 a.m. Thursday, according to IQ Air which tracks air quality ratings across the world. Air quality is ranked in these categories: 0-50 = Good, 51-100 = Moderate, 101-150 = Unhealthy for sensitive groups, 151-200 = Unhealthy, 201-300 Very unhealthy, 301+ = Hazardous (snip)

In the latest AFD from LWX... National Weather Service Baltimore MD/Washington DC 400 AM EDT Sat Jul 4 2026 .WHAT HAS CHANGED... Given an uptick in today`s heat index forecast, have upgraded to Extreme Heat Warnings across north-central Maryland down across the eastern West Virginia Panhandle into the Shenandoah Valley. For today`s convective threat, the Storm Prediction Center has upgraded to an Enhanced Risk for severe thunderstorms across locations east of the Blue Ridge Mountains. (snip) Before convection enters the picture, it will be another day of record warmth across the Mid-Atlantic region. Using 850-mb temperatures as a proxy, forecast readings should be around 22-23C which dry adiabatic mixing favors another 100 degree day. Adding continued tropical moisture in place will support heat indices pushing into the 105 to 110 degree range. Extreme Heat Warnings are in effect from 10 AM until 9 PM for areas east of the Blue Ridge. (snip) Although vertical shear is only around 20 to 25 knots, any storms able to tap into the robust instability will be capable of damaging winds. Some of this could be locally destructive with gusts up to 60 to 75 mph. (snip) The primary signal east of the Blue Ridge is in the 3-9 PM timeframe, slightly earlier to the west. Damaging to locally destructive winds are the main threat, with any chance for large hail being minimal given the summertime freezing levels. (snip)

Hear=t advisories posted for virtually the entire LWX area. WWA Summary for Heat Advisory Issued by LWX

Severe thunderstorm watch posted further south/east from DC, including Calvert and St Mary's.

Visibility down to about 1/2 mile in the downpour near DCA. edit: now more like 1/4 mile.

Heat advisory up for parts of the DC/Baltimore metros and points east including the western shore of the Chesapeake Bay.

LWX's daily reports showed a T of snow at DCA and IAD, tying records.

Looks like the warm water helped keep DCA (and a few other spots "on" the water) well short of freezing. A few other locations may also have escaped. But IAD hit 27, BWI 30

I prepared for tomorrow morning by looking at a list of DCA "latest last freezes" through 2023. The most recent one on April 10 (or later) was 2016. More on this if DCA does indeed hit freezing tomorrow (it MIGHT not).

In 2025, "last freeze" dates at DCA/IAD/BWI: DCA: March 3 IAD: April 9 BWI: April 9

Warnings for an upcoming freeze all across the region. Only SE Virginia is spared, and of course the mountains don't get freeze warnings yet. ((Sorry for those who might have thought Tax Day signalled "safe to plant" starting time for tender stuff.))

URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 1159 PM EDT Sat Apr 18 2026 MDZ011-504-506-508-VAZ036-037-053-055-056-527-191200- /O.NEW.KLWX.FZ.A.0003.260421T0600Z-260421T1400Z/ Southern Baltimore-Central and Southeast Montgomery-Central and Southeast Howard-Southeast Harford-Nelson-Albemarle-Fairfax- Stafford-Spotsylvania-Central and Southeast Prince William/Manassas/Manassas Park- 1159 PM EDT Sat Apr 18 2026 ...FREEZE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures as low as 29 to 32 degrees possible, especially northwest of I-95. * WHERE...In Maryland, Central and Southeast Howard, Central and Southeast Montgomery, Southeast Harford, and Southern Baltimore Counties. In Virginia, Albemarle, Nelson, Spotsylvania, Central and Southeast Prince William/Manassas/Manassas Park, Fairfax, and Stafford Counties. * WHEN...From late Monday night through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold.