Alert archive / West Virginia / River Flood Warnings in 2020

River Flood Warning 4, NWS Baltimore/Washington

May 1, 2020Washington County, Maryland; Berkeley County, Jefferson County, West Virginia

NWS Baltimore/Washington issued this river flood warning at May 1, 2020, 4:18 AM EDT for Washington County, Maryland; Berkeley County, Jefferson County, West Virginia. It took effect at May 1, 2020, 6:44 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: May 1, 2020, 4:18 AM EDT (08:18 UTC)
In effect from: May 1, 2020, 6:44 PM EDT
Expired: May 2, 2020, 2:57 AM EDT
In force: 8 hr
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: Minor

Counties Washington County, MD, Berkeley County, WV, Jefferson County, WV

The radar

The Sterling radar (KLWX), 64 km from the middle of the area, began a volume at 08:21 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 Potomac River at Shepherdstown (SHEW2). The gauge peaked at 15.25 ft at May 1, 2020, 9:00 PM EDT.

Action stage: 8 ft
Minor stage: 15 ft
Moderate stage: 22 ft
Major stage: 25 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01618000, 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 May 1, 3:36 AM EDT, 42 minutes earlier.

Area forecast discussion, May 1, 3:36 AM EDT, 42 minutes before

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Hazardous weather outlook, May 1, 1:12 AM EDT, 3 hours 6 minutes before

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In the hours before

Local storm report, Apr 30, 10:37 PM EDT, 5 hours 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1037 PM EDT THU APR 30 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0730 PM     FLOOD            3 SSW HARNEY            39.68N  77.23W
04/30/2020                   CARROLL            MD   MESONET

            THE WATER LEVEL ALONG THE MONOCACY RIVER AT BRIDGEPORT
            ROSE ABOVE THE FLOOD STAGE OF 13 FEET AT 7:30 PM THIS
            EVENING. WATER LEVELS CONTINUE TO SLOWLY RISE LATE THIS
            EVENING. AT 13 FEET, BAPTIST ROAD NEAR BRIDGEPORT BEGINS
            TO FLOOD.

&&

EVENT NUMBER LWX2001101

BJL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 11:38 PM EDT	Small Craft Advisory	LWX		34 hr
May 1, 12:49 AM EDT	Coastal Flood Advisory	LWX	Arlington, City of Alexandria, City of Falls Church	40 hr
May 1, 4:30 AM EDT	River Flood Watch	LWX	Loudoun	11 hr
May 1, 3:39 PM EDT	River Flood Warning	LWX	Loudoun	25 hr
May 1, 4:11 AM EDT	River Flood Warning	LWX	Frederick	14 hr
May 1, 12:11 AM EDT	River Flood Warning	LWX	Morgan	17 hr

Nearby

River Flood Warnings in West Virginia, 2020 River Flood Warnings in Maryland, 2020 Every river 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.