Alert archive / Maryland / Flash Flood Warnings in 2020
Flash Flood Warning 1, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jun 5, 2020, 4:47 PM EDT for Baltimore County, Harford County, Maryland. It was in force for 3 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
- Jun 5, 2020, 4:47 PM EDT (20:47 UTC)
- Expired
- Jun 5, 2020, 7:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Baltimore County, MD, Harford County, MD
The radar
The Sterling radar (KLWX), 105 km from the middle of the area, began a volume at 20:47 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, 8.8 hours before the alert went out and 101 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
- 126 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Jun 5, 3:00 PM EDT, 1 hour 47 minutes earlier.
Area forecast discussion, Jun 5, 3:00 PM EDT, 1 hour 47 minutes before
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Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 803 AM EDT Fri Jun 5 2020 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-061000- 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- 803 AM EDT Fri Jun 5 2020 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 portions of Maryland, Virginia and the District of Columbia this afternoon and evening. Scattered instances of flooding are possible due to heavy rain from thunderstorms. Isolated instances of damaging wind gusts are also possible. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotters activation may be needed this afternoon and evening. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-061000- 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- 803 AM EDT Fri Jun 5 2020 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 Maryland, Virginia and West Virginia this afternoon and evening. Scattered instances of flooding are possible due to heavy rain from thunderstorms. Isolated instances of damaging wind gusts are also possible. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening.
In the hours before
Local storm report, Jun 5, 3:46 PM EDT, 1 hour 1 minute before
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</html>Local storm report, Jun 5, 4:29 PM EDT, 18 minutes before
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</html>Local storm report, Jun 5, 4:36 PM EDT, 11 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 |
|---|---|---|---|---|
| Jun 4, 8:01 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, Fairfax, City of Alexandria | 44 min |
| Jun 4, 8:24 PM EDT | Special Marine Warning | LWX | 96 min | |
| Jun 4, 8:27 PM EDT | Special Marine Warning | LWX | 33 min | |
| Jun 4, 8:38 PM EDT | Special Marine Warning | LWX | 97 min | |
| Jun 4, 10:10 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 25 min |
| Jun 4, 10:34 PM EDT | Special Marine Warning | LWX | 41 min | |
| Jun 4, 10:44 PM EDT | Areal Flood Warning | LWX | Page, Rockingham, Shenandoah | 6 hr |
| Jun 4, 10:51 PM EDT | Flash Flood Watch | LWX | Arlington, Culpeper, Fairfax, Fauquier, Greene, Loudoun and 11 more | 4 hr |
| Jun 4, 11:27 PM EDT | Areal Flood Warning | LWX | Arlington, Fairfax, Prince William, City of Alexandria, City of Fairfax, City of Falls Church and 2 more | 6 hr |
| Jun 5, 3:40 AM EDT | Flash Flood Watch | LWX | Albemarle, Amherst, Arlington, Augusta, Clarke, Culpeper and 27 more | 17 hr |
| Jun 5, 5:34 AM EDT | Areal Flood Warning | LWX | Fairfax | 2 hr |
| Jun 5, 2:20 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 27 min |
| Jun 5, 2:21 PM EDT | Special Marine Warning | LWX | 33 min | |
| Jun 5, 3:18 PM EDT | Areal Flood Warning | LWX | Clarke, Frederick, City of Winchester | 116 min |
| Jun 5, 3:19 PM EDT | Severe Thunderstorm Warning | LWX | Madison, Page, Rockingham, Shenandoah | 41 min |
| Jun 5, 5:59 PM EDT | Special Marine Warning | LWX | 72 min | |
| Jun 5, 6:37 PM EDT | Special Marine Warning | LWX | 38 min | |
| Jun 5, 6:53 PM EDT | Special Marine Warning | LWX | 41 min | |
| Jun 4, 8:50 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 40 min |
| Jun 5, 1:12 AM EDT | Areal Flood Warning | LWX | Anne Arundel, Prince George's | 3 hr |
| Jun 5, 3:38 AM EDT | Coastal Flood Advisory | LWX | Anne Arundel | 5 hr |
| Jun 5, 4:21 PM EDT | Areal Flood Warning | LWX | Baltimore, Harford | 13 hr |
| Jun 5, 4:28 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick, Howard, Montgomery | 4 hr |
| Jun 5, 6:15 PM EDT | Areal Flood Warning | LWX | Montgomery | 3 hr |
Nearby
Flash Flood Warnings in Maryland, 2020Every flash flood warning in 2020
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.