Alert archive / Virginia / Flash Flood Warnings in 2018
Flash Flood Warning 86, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Oct 11, 2018, 4:35 PM EDT for Culpeper County, Orange County, Spotsylvania County, Virginia. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Oct 11, 2018, 4:35 PM EDT (20:35 UTC)
- Expired
- Oct 11, 2018, 9:15 PM EDT
- In force
- 5 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
Counties Culpeper County, VA, Orange County, VA, Spotsylvania County, VA
The radar
The Sterling radar (KLWX), 82 km from the middle of the area, began a volume at 20:36 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.6 hours before the alert went out and 83 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 435 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 461 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.0
What forecasters said that day
The local office's own words before this flash 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 flash flood warning went out at Oct 11, 3:33 PM EDT, 1 hour 2 minutes earlier.
Area forecast discussion, Oct 11, 3:33 PM EDT, 1 hour 2 minutes before
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</html>Hazardous weather outlook, Oct 11, 9:18 AM EDT, 7 hours 17 minutes before
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 918 AM EDT Thu Oct 11 2018 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-121000- 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- 918 AM EDT Thu Oct 11 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 for areas near and east of Interstate 95 this afternoon and tonight. Isolated instances of flooding are possible outside the watch area during this time. A Wind Advisory is in effect for Saint Mary's and Calvert Counties in southern Maryland tonight. A Storm Warning is in effect for the lower tidal Potomac and lower Maryland portion of the Chesapeake Bay tonight. A Gale Warning is in effect for the remainder of the waters during this time. An isolated tornado or waterspout is possible over far southern Maryland this afternoon and this evening. .DAYS TWO THROUGH SEVEN...Friday through Wednesday A Gale Warning is in effect for the waters Friday. .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>506-121000- 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- 918 AM EDT Thu Oct 11 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 portions of central Virginia this afternoon and tonight. Isolated instances of flooding are possible outside the watch area during this time. A Wind Advisory is in effect for the northern and central Virginia Blue Ridge mountains 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.
In the hours before
Local storm report, Oct 11, 3:52 PM EDT, 43 minutes before
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</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 8:29 PM EDT | Coastal Flood Advisory | LWX | Arlington, City of Alexandria, City of Falls Church | 4 hr |
| Oct 11, 2:49 AM EDT | Storm Warning | LWX | 25 hr | |
| Oct 11, 3:12 AM EDT | Wind Advisory | LWX | Albemarle, Amherst, Arlington, Augusta, Fairfax, Fauquier and 15 more | 29 hr |
| Oct 11, 1:52 PM EDT | Small Craft Advisory | LWX | 36 hr | |
| Oct 11, 2:56 PM EDT | Flash Flood Warning | LWX | Albemarle, Augusta, Nelson, City of Charlottesville, City of Waynesboro | 6 hr |
| Oct 11, 3:39 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, Orange, Spotsylvania, Stafford | 34 min |
| Oct 11, 5:47 PM EDT | Areal Flood Warning | LWX | Prince William | 4 hr |
| Oct 11, 6:23 PM EDT | Flash Flood Warning | LWX | King George, Prince William, Spotsylvania, Stafford, City of Fredericksburg | 3 hr |
| Oct 11, 6:51 PM EDT | Areal Flood Warning | LWX | Fairfax, City of Alexandria | 2 hr |
| Oct 11, 2:27 PM EDT | Coastal Flood Advisory | LWX | Baltimore, City of Baltimore | 9 hr |
| Oct 11, 7:59 PM EDT | Areal Flood Warning | LWX | Charles, Prince George's | 24 hr |
Nearby
Flash Flood Warnings in Virginia, 2018Every flash 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.