Alert archive / Maryland / River Flood Warnings in 2011

River Flood Warning 81, NWS Baltimore/Washington

December 7, 2011Montgomery County, Maryland

NWS Baltimore/Washington issued this river flood warning at Dec 7, 2011, 10:11 PM EST for Montgomery County, Maryland. It took effect at Dec 7, 2011, 10:20 PM EST. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Dec 7, 2011, 10:11 PM EST (03:11 UTC)
In effect from: Dec 7, 2011, 10:20 PM EST
Expired: Dec 8, 2011, 5:01 AM EST
In force: 7 hr
Issued by: NWS Baltimore/Washington
Flood severity: Minor

County Montgomery County, MD

The radar

The Sterling radar (KLWX), 30 km from the middle of the area, began a volume at 03:10 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 Seneca Creek at Dawsonville (DAWM2). The gauge peaked at 7.92 ft at Dec 8, 2011, 12:00 AM EST.

Action stage: 5 ft
Minor stage: 7.5 ft
Moderate stage: 11 ft
Major stage: 16 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01645000, 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 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 river flood warning went out at Dec 7, 9:29 PM EST, 42 minutes earlier.

Area forecast discussion, Dec 7, 9:29 PM EST, 42 minutes before

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Hazardous weather outlook, Dec 7, 3:03 PM EST, 7 hours 8 minutes before

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In the hours before

Local storm report, Dec 7, 4:16 PM EST, 5 hours 55 minutes before

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Local storm report, Dec 7, 8:11 PM EST, 2 hours before

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Local storm report, Dec 7, 8:52 PM EST, 1 hour 19 minutes before

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Local storm report, Dec 7, 9:19 PM EST, 52 minutes before

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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Dec 7, 9:28 PM EST, 43 minutes before

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      <p id="message2">
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 7, 7:39 PM EST	Areal Flood Warning	LWX	King George	6 hr
Dec 8, 2:39 AM EST	River Flood Watch	LWX	Loudoun	24 hr
Dec 8, 3:06 AM EST	Small Craft Advisory	LWX		12 hr
Dec 8, 5:58 AM EST	Small Craft Advisory	LWX		9 hr
Dec 7, 9:36 PM EST	Areal Flood Warning	LWX	Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore	4 hr
Dec 8, 7:17 AM EST	River Flood Warning	LWX	Berkeley, Jefferson	13 hr

Nearby

River Flood Warnings in Maryland, 2011 Every river 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.