Alert archive / Virginia / River Flood Warnings in 2018

River Flood Warning 97, NWS Baltimore/Washington

September 27, 2018Loudoun County, Virginia; Montgomery County, Maryland

NWS Baltimore/Washington issued this river flood warning at Sep 27, 2018, 9:31 PM EDT for Loudoun County, Virginia; Montgomery County, Maryland. It took effect at Sep 28, 2018, 3:47 AM EDT. It was in force for 72 hr.

The area

The counties it named.

The facts

Issued
Sep 27, 2018, 9:31 PM EDT (01:31 UTC)
In effect from
Sep 28, 2018, 3:47 AM EDT
Expired
Oct 1, 2018, 3:37 AM EDT
In force
72 hr
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
Minor

Counties Montgomery County, MD, Loudoun County, VA

The radar

The Sterling radar (KLWX), 16 km from the middle of the area, began a volume at 01:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Potomac River at Edwards Ferry (EDFM2). The gauge peaked at 21.35 ft at Sep 29, 2018, 12:00 PM EDT.

actionminormoderate152009/2809/2909/3010/0110/02
Action stage
12.25 ft
Minor stage
15 ft
Moderate stage
17 ft
Major stage
24 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01644148, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this river flood warning went out at Sep 27, 2:33 PM EDT, 6 hours 58 minutes earlier.

Area forecast discussion, Sep 27, 2:33 PM EDT, 6 hours 58 minutes before
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Hazardous weather outlook, Sep 27, 7:45 PM EDT, 1 hour 46 minutes before
Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
745 PM EDT Thu Sep 27 2018

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-282345-
Chesapeake Bay north of Pooles Island MD-
Chesapeake Bay from Pooles Island to Sandy Point MD-
Chesapeake Bay from Sandy Point to North Beach MD-
Chesapeake Bay from North Beach to Drum Point MD-
Chesapeake Bay from Drum Point MD to Smith Point VA-
Tidal Potomac from Key Bridge to Indian Head MD-
Tidal Potomac from Indian Head to Cobb Island MD-
Tidal Potomac from Cobb Island MD to Smith Point VA-
Patapsco River including Baltimore Harbor-
Chester River to Queenstown MD-Eastern Bay-
Choptank River to Cambridge MD and the Little Choptank River-
Patuxent River to Broomes Island MD-
Tangier Sound and the inland waters surrounding Bloodsworth
Island-District of Columbia-Southern Baltimore-Prince Georges-
Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
745 PM EDT Thu Sep 27 2018

This Hazardous Weather Outlook is for the Maryland portion of the
Chesapeake Bay, Tidal Potomac River, and adjacent counties in
central Maryland and northern Virginia as well as the District of
Columbia.

.DAY ONE...Tonight

A Flood Watch is in effect for much of northern and central
Maryland and northern Virginia including the Baltimore MD and
Washington DC through tonight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053-
055-501>506-282345-
Washington-Frederick MD-Carroll-Northern Baltimore-
Extreme Western Allegany-Central and Eastern Allegany-
Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-
Nelson-Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper-
Northern Fauquier-Southern Fauquier-Western Highland-
Eastern Highland-Western Loudoun-Eastern Loudoun-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-
Hampshire-Morgan-Berkeley-Jefferson-Hardy-Western Grant-
Eastern Grant-Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
745 PM EDT Thu Sep 27 2018

This Hazardous Weather Outlook is for eastern West Virginia,
northern and central Virginia, and central and western Maryland
with the exception of Garrett County.

.DAY ONE...Tonight

A Flood Watch is in effect for eastern West Virginia, much of
central and northern Virginia and central and western Maryland
through tonight.

Please consult River Flood Warnings for the latest information on
main stem river flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Main stem river flooding may persist into the first part of the
weekend, particularly on the Potomac River basin.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 27, 8:24 PM EDTAreal Flood WarningLWXClarke, Frederick, Shenandoah, Warren, City of Winchester15 hr
Sep 27, 9:34 PM EDTRiver Flood WatchLWXLoudoun62 hr
Sep 27, 9:36 PM EDTRiver Flood WatchLWXClarke, Warren48 hr
Sep 27, 9:53 PM EDTAreal Flood WarningLWXAugusta, Highland, Rockingham, Shenandoah, City of Harrisonburg, City of Staunton and 1 more33 hr
Sep 28, 12:09 AM EDTAreal Flood WarningLWXFrederick, Loudoun22 hr
Sep 28, 12:53 AM EDTCoastal Flood AdvisoryLWXArlington, City of Alexandria, City of Falls Church37 hr
Sep 28, 1:09 AM EDTAreal Flood WarningLWXArlington, Fairfax, Loudoun, City of Alexandria, City of Fairfax, City of Falls Church11 hr
Sep 28, 2:14 AM EDTSpecial Marine WarningLWX91 min
Sep 28, 2:16 AM EDTSpecial Marine WarningLWX89 min
Sep 28, 3:46 AM EDTRiver Flood WarningLWXLoudoun56 hr
Sep 28, 3:49 AM EDTRiver Flood WarningLWXFairfax, Loudoun56 hr
Sep 28, 3:51 AM EDTRiver Flood WarningLWXClarke, Warren58 hr
Sep 28, 4:58 AM EDTAreal Flood WarningLWXFairfax, Fauquier, Prince William, City of Manassas, City of Manassas Park16 hr
Sep 28, 6:29 AM EDTAreal Flood WarningLWXCulpeper, Fauquier, Madison3 hr
Sep 28, 7:13 AM EDTRiver Flood WarningLWXLoudoun11 hr
Sep 28, 9:57 AM EDTRiver Flood WarningLWXRockingham6 hr
Sep 28, 9:57 AM EDTRiver Flood WarningLWXPage16 hr
Sep 28, 12:40 PM EDTRiver Flood WarningLWXCulpeper, Fauquier9 hr
Sep 27, 8:36 PM EDTAreal Flood WarningLWXAllegany9 hr
Sep 27, 9:26 PM EDTRiver Flood WarningLWXWashington61 hr
Sep 27, 10:06 PM EDTAreal Flood WarningLWXAllegany, Washington31 hr
Sep 27, 11:37 PM EDTRiver Flood WarningLWXMontgomery11 hr
Sep 27, 11:45 PM EDTRiver Flood WarningLWXGarrett4 hr
Sep 28, 2:03 AM EDTAreal Flood WarningLWXAnne Arundel, Baltimore, Carroll, Harford, Howard, Prince George's and 1 more20 hr
Sep 28, 3:54 AM EDTRiver Flood WarningLWXWashington22 hr
Sep 28, 3:55 AM EDTRiver Flood WarningLWXFrederick22 hr
Sep 28, 3:57 AM EDTRiver Flood WatchLWXAllegany29 hr
Sep 28, 8:44 AM EDTRiver Flood WatchLWXWashington41 hr
Sep 28, 9:53 AM EDTRiver Flood WarningLWXAllegany16 hr
Sep 28, 9:54 AM EDTRiver Flood WarningLWXWashington32 hr
Sep 28, 1:56 PM EDTCoastal Flood AdvisoryLWXAnne Arundel, Saint Mary's8 hr
Sep 27, 9:14 PM EDTRiver Flood WarningLWXBerkeley, Jefferson36 hr
Sep 28, 12:35 AM EDTRiver Flood WarningLWXPendleton3 hr
Sep 28, 3:41 AM EDTRiver Flood WarningLWXHampshire, Hardy22 hr
Sep 28, 4:00 AM EDTRiver Flood WatchLWXMorgan4 hr
Sep 28, 7:45 AM EDTRiver Flood WarningLWXMorgan21 hr

Nearby

River Flood Warnings in Virginia, 2018River Flood Warnings in Maryland, 2018Every river flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.