Alert archive / Virginia / River Flood Watches in 2018

River Flood Watch 21, NWS Baltimore/Washington

July 23, 2018Loudoun County, Virginia; Montgomery County, Maryland

NWS Baltimore/Washington issued this river flood watch at Jul 23, 2018, 10:48 AM EDT for Loudoun County, Virginia; Montgomery County, Maryland. It took effect at Jul 25, 2018, 9:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Jul 23, 2018, 10:48 AM EDT (14:48 UTC)
In effect from
Jul 25, 2018, 9:00 AM EDT
Expired
Jul 24, 2018, 10:11 AM EDT
In force
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
None

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 14:50 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).

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 watch 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 watch went out at Jul 23, 10:20 AM EDT, 28 minutes earlier.

Area forecast discussion, Jul 23, 10:20 AM EDT, 28 minutes before
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Hazardous weather outlook, Jul 23, 7:41 AM EDT, 3 hours 7 minutes before
Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
741 AM EDT Mon Jul 23 2018

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-241145-
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-
741 AM EDT Mon Jul 23 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...Today and Tonight

A Flash Flood Watch is in effect through late tonight for the
entire outlook area.

Scattered showers and thunderstorms with gusty winds over the
waters may require Special Marine Warnings.

A Coastal Flood Watch is in effect for Anne Arundel County late
tonight.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Numerous incidents of flooding are likely Tuesday into Wednesday.
Flash Flood Watches will likely be extended.

A Coastal Flood Watch continues into Tuesday for Anne Arundel
County.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time. Please report
rainfall totals and any observed flooding to the National Weather
Service.

MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053-
055-501>506-241145-
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-
741 AM EDT Mon Jul 23 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...Today and Tonight

A Flash Flood Watch is in effect for all areas along and east of
the Interstate 81 corridor through late tonight.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Scattered to numerous incidents of flooding are likely Tuesday
into Wednesday. Flash Flood Watches will likely be extended.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.  Please report
rainfall totals and any observed flooding to the National Weather
Service.

HTS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 8:21 PM EDTSpecial Marine WarningLWX95 min
Jul 23, 3:15 AM EDTSpecial Marine WarningLWX45 min
Jul 23, 4:22 AM EDTSpecial Marine WarningLWX53 min
Jul 23, 4:59 AM EDTFlash Flood WatchLWXAlbemarle, Amherst, Arlington, Augusta, Clarke, Culpeper and 26 more68 hr
Jul 23, 6:04 AM EDTSpecial Marine WarningLWX86 min
Jul 23, 6:23 AM EDTSpecial Marine WarningLWX96 min
Jul 23, 6:50 AM EDTSmall Craft AdvisoryLWX48 hr
Jul 23, 10:50 AM EDTRiver Flood WatchLWXCulpeper, Fauquier5 hr
Jul 23, 12:20 PM EDTSpecial Marine WarningLWX55 min
Jul 23, 1:57 PM EDTSpecial Marine WarningLWX48 min
Jul 23, 4:49 PM EDTSpecial Marine WarningLWX48 min
Jul 23, 6:44 PM EDTSpecial Marine WarningLWX68 min
Jul 23, 7:56 PM EDTSpecial Marine WarningLWX10 min
Jul 22, 8:03 PM EDTAreal Flood WarningLWXHarford3 hr
Jul 23, 2:17 AM EDTAreal Flood WarningLWXAnne Arundel, Baltimore, Carroll, City of Baltimore6 hr
Jul 23, 3:17 AM EDTCoastal Flood WatchLWXAnne Arundel12 hr
Jul 23, 5:30 AM EDTAreal Flood WarningLWXBaltimore, Howard3 hr
Jul 23, 10:41 AM EDTRiver Flood WarningLWXMontgomery35 hr
Jul 23, 10:46 AM EDTRiver Flood WatchLWXWashington24 hr
Jul 23, 10:47 AM EDTRiver Flood WatchLWXWashington24 hr
Jul 23, 3:08 PM EDTCoastal Flood WarningLWXAnne Arundel12 hr
Jul 23, 3:08 PM EDTCoastal Flood AdvisoryLWXCalvert12 hr
Jul 23, 3:38 PM EDTAreal Flood WarningLWXWashington11 hr
Jul 23, 3:47 PM EDTAreal Flood WarningLWXBaltimore, Harford4 hr
Jul 23, 7:59 PM EDTSevere Thunderstorm WarningLWXSaint Mary's17 min
Jul 23, 10:49 AM EDTRiver Flood WatchLWXBerkeley, Jefferson29 hr

Nearby

River Flood Watches in Virginia, 2018River Flood Watches in Maryland, 2018Every river flood watch 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.