Alert archive / Maryland / Flash Flood Warnings in 2011
Flash Flood Warning 104, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Aug 15, 2011, 8:01 AM EDT for Anne Arundel County, Baltimore County, City of Baltimore, 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
- Aug 15, 2011, 8:01 AM EDT (12:01 UTC)
- Expired
- Aug 15, 2011, 10:31 AM EDT
- In force
- 3 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
Counties Anne Arundel County, MD, Baltimore County, MD, City of Baltimore, MD
The radar
The Sterling radar (KLWX), 82 km from the middle of the area, began a volume at 12:03 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 0.0 hours before the alert went out and 50 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
- 460 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 689 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 Aug 15, 3:22 AM EDT, 4 hours 39 minutes earlier.
Area forecast discussion, Aug 15, 3:22 AM EDT, 4 hours 39 minutes before
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Local storm report, Aug 15, 2:24 AM EDT, 5 hours 37 minutes before
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</html>Local storm report, Aug 15, 3:15 AM EDT, 4 hours 46 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 |
|---|---|---|---|---|
| Aug 14, 8:13 PM EDT | Special Marine Warning | LWX | 92 min | |
| Aug 14, 8:18 PM EDT | Special Weather Statement | LWX | King George, City of Fredericksburg | 42 min |
| Aug 14, 8:19 PM EDT | Special Marine Warning | LWX | 86 min | |
| Aug 14, 8:33 PM EDT | Special Weather Statement | LWX | 27 min | |
| Aug 14, 8:55 PM EDT | Special Weather Statement | LWX | 50 min | |
| Aug 14, 9:15 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Loudoun | 22 min |
| Aug 14, 9:43 PM EDT | Special Marine Warning | LWX | 2 hr | |
| Aug 14, 9:51 PM EDT | Special Marine Warning | LWX | 84 min | |
| Aug 14, 10:21 PM EDT | Special Weather Statement | LWX | Arlington, City of Alexandria | 54 min |
| Aug 14, 10:32 PM EDT | Areal Flood Warning | LWX | Albemarle, Nelson, City of Charlottesville | 3 hr |
| Aug 14, 11:08 PM EDT | Special Marine Warning | LWX | 97 min | |
| Aug 15, 12:40 AM EDT | Special Marine Warning | LWX | 58 min | |
| Aug 15, 1:09 AM EDT | Coastal Flood Advisory | LWX | Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more | 9 hr |
| Aug 15, 8:18 AM EDT | Special Marine Warning | LWX | 57 min | |
| Aug 15, 12:47 PM EDT | Special Weather Statement | LWX | City of Harrisonburg | 28 min |
| Aug 15, 4:42 PM EDT | Special Marine Warning | LWX | 68 min | |
| Aug 15, 5:17 PM EDT | Special Marine Warning | LWX | 88 min | |
| Aug 15, 6:14 PM EDT | Special Marine Warning | LWX | 57 min | |
| Aug 14, 8:29 PM EDT | Special Weather Statement | LWX | Montgomery | 31 min |
| Aug 14, 9:02 PM EDT | Special Weather Statement | LWX | Montgomery | 28 min |
| Aug 14, 9:23 PM EDT | Flash Flood Warning | LWX | Montgomery, Prince George's | 3 hr |
| Aug 14, 9:36 PM EDT | Special Weather Statement | LWX | Howard, Montgomery | 54 min |
| Aug 14, 9:54 PM EDT | Flash Flood Warning | LWX | Frederick, Montgomery | 3 hr |
| Aug 14, 10:18 PM EDT | Special Weather Statement | LWX | Carroll | 42 min |
| Aug 14, 10:49 PM EDT | Special Weather Statement | LWX | Baltimore, City of Baltimore | 56 min |
| Aug 14, 11:27 PM EDT | Flash Flood Warning | LWX | Baltimore, Carroll, Howard, City of Baltimore | 77 min |
| Aug 15, 7:51 AM EDT | Special Weather Statement | LWX | City of Baltimore | 39 min |
| Aug 15, 9:23 AM EDT | Flash Flood Warning | LWX | Baltimore, City of Baltimore | 3 hr |
| Aug 15, 9:36 AM EDT | Special Weather Statement | LWX | City of Baltimore | 24 min |
| Aug 15, 12:10 PM EDT | Flash Flood Watch | LWX | Baltimore, Carroll, City of Baltimore | 6 hr |
| Aug 15, 1:10 PM EDT | Flash Flood Warning | LWX | Baltimore, City of Baltimore | 118 min |
| Aug 15, 3:49 PM EDT | Special Weather Statement | LWX | Calvert | 26 min |
| Aug 15, 3:53 PM EDT | Special Weather Statement | LWX | Prince George's | 37 min |
| Aug 15, 4:12 PM EDT | Special Weather Statement | LWX | Prince George's | 33 min |
| Aug 15, 4:28 PM EDT | Special Weather Statement | LWX | Saint Mary's | 32 min |
| Aug 15, 4:33 PM EDT | Flash Flood Warning | LWX | Prince George's | 80 min |
| Aug 14, 8:15 PM EDT | Special Weather Statement | LWX | Mineral | 30 min |
| Aug 15, 1:01 PM EDT | Special Weather Statement | LWX | Hardy | 29 min |
Nearby
Flash Flood Warnings in Maryland, 2011Every flash flood warning in 2011
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.