Alert archive / Maryland / Flash Flood Warnings in 2009
Flash Flood Warning 29, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jun 18, 2009, 7:26 AM EDT for Anne Arundel County, Maryland. It was in force for 111 min. 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 18, 2009, 7:26 AM EDT (11:26 UTC)
- Expired
- Jun 18, 2009, 9:17 AM EDT
- In force
- 111 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
County Anne Arundel County, MD
The radar
The Sterling radar (KLWX), 79 km from the middle of the area, began a volume at 11:28 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 00:00Z, 11.4 hours before the alert went out and 72 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
- 56 J/kg
- Mixed-layer CIN
- -123 J/kg
- Mixed-layer LCL
- 563 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 488 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
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 18, 6:46 AM EDT, 40 minutes earlier.
Area forecast discussion, Jun 18, 6:46 AM EDT, 40 minutes before
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Special weather statement, Jun 18, 2:10 AM EDT, 5 hours 16 minutes before
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</html>Local storm report, Jun 18, 4:43 AM EDT, 2 hours 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 |
|---|---|---|---|---|
| Jun 17, 9:23 PM EDT | Flash Flood Watch | LWX | Clarke, Frederick, City of Winchester | 7 hr |
| Jun 18, 12:00 AM EDT | Severe Thunderstorm Warning | LWX | Frederick | 45 min |
| Jun 18, 6:39 AM EDT | Special Marine Warning | LWX | 111 min | |
| Jun 18, 12:35 PM EDT | Special Marine Warning | LWX | 85 min | |
| Jun 18, 2:10 PM EDT | Special Marine Warning | LWX | 65 min | |
| Jun 18, 2:25 PM EDT | Severe Thunderstorm Warning | LWX | Spotsylvania | 33 min |
| Jun 18, 3:09 PM EDT | Special Marine Warning | LWX | 96 min | |
| Jun 18, 3:46 PM EDT | Severe Thunderstorm Warning | LWX | King George | 59 min |
| Jun 18, 4:19 PM EDT | Special Marine Warning | LWX | 116 min | |
| Jun 18, 12:06 AM EDT | Severe Thunderstorm Warning | LWX | Allegany | 39 min |
| Jun 18, 2:26 PM EDT | Coastal Flood Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 12 hr |
| Jun 18, 2:56 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 49 min |
| Jun 17, 11:12 PM EDT | Severe Thunderstorm Warning | LWX | Hampshire, Mineral | 48 min |
| Jun 17, 11:36 PM EDT | Tornado Warning | LWX | Hampshire | 39 min |
| Jun 18, 12:12 AM EDT | Flash Flood Warning | LWX | Mineral | 3 hr |
| Jun 18, 12:42 AM EDT | Flash Flood Warning | LWX | Hampshire | 3 hr |
Nearby
Flash Flood Warnings in Maryland, 2009Every flash flood warning in 2009
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.