Alert archive / Virginia / River Flood Watches in 2018
River Flood Watch 21, NWS Baltimore/Washington
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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</html>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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 8:21 PM EDT | Special Marine Warning | LWX | 95 min | |
| Jul 23, 3:15 AM EDT | Special Marine Warning | LWX | 45 min | |
| Jul 23, 4:22 AM EDT | Special Marine Warning | LWX | 53 min | |
| Jul 23, 4:59 AM EDT | Flash Flood Watch | LWX | Albemarle, Amherst, Arlington, Augusta, Clarke, Culpeper and 26 more | 68 hr |
| Jul 23, 6:04 AM EDT | Special Marine Warning | LWX | 86 min | |
| Jul 23, 6:23 AM EDT | Special Marine Warning | LWX | 96 min | |
| Jul 23, 6:50 AM EDT | Small Craft Advisory | LWX | 48 hr | |
| Jul 23, 10:50 AM EDT | River Flood Watch | LWX | Culpeper, Fauquier | 5 hr |
| Jul 23, 12:20 PM EDT | Special Marine Warning | LWX | 55 min | |
| Jul 23, 1:57 PM EDT | Special Marine Warning | LWX | 48 min | |
| Jul 23, 4:49 PM EDT | Special Marine Warning | LWX | 48 min | |
| Jul 23, 6:44 PM EDT | Special Marine Warning | LWX | 68 min | |
| Jul 23, 7:56 PM EDT | Special Marine Warning | LWX | 10 min | |
| Jul 22, 8:03 PM EDT | Areal Flood Warning | LWX | Harford | 3 hr |
| Jul 23, 2:17 AM EDT | Areal Flood Warning | LWX | Anne Arundel, Baltimore, Carroll, City of Baltimore | 6 hr |
| Jul 23, 3:17 AM EDT | Coastal Flood Watch | LWX | Anne Arundel | 12 hr |
| Jul 23, 5:30 AM EDT | Areal Flood Warning | LWX | Baltimore, Howard | 3 hr |
| Jul 23, 10:41 AM EDT | River Flood Warning | LWX | Montgomery | 35 hr |
| Jul 23, 10:46 AM EDT | River Flood Watch | LWX | Washington | 24 hr |
| Jul 23, 10:47 AM EDT | River Flood Watch | LWX | Washington | 24 hr |
| Jul 23, 3:08 PM EDT | Coastal Flood Warning | LWX | Anne Arundel | 12 hr |
| Jul 23, 3:08 PM EDT | Coastal Flood Advisory | LWX | Calvert | 12 hr |
| Jul 23, 3:38 PM EDT | Areal Flood Warning | LWX | Washington | 11 hr |
| Jul 23, 3:47 PM EDT | Areal Flood Warning | LWX | Baltimore, Harford | 4 hr |
| Jul 23, 7:59 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 17 min |
| Jul 23, 10:49 AM EDT | River Flood Watch | LWX | Berkeley, Jefferson | 29 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.