Alert archive / Maryland / River Flood Warnings in 2011

River Flood Warning 42, NWS Baltimore/Washington

April 19, 2011Allegany County, Maryland

NWS Baltimore/Washington issued this river flood warning at Apr 19, 2011, 10:11 AM EDT for Allegany County, Maryland. It took effect at Apr 19, 2011, 3:27 PM EDT. It was in force for .

The area

The counties it named.

The facts

Issued: Apr 19, 2011, 10:11 AM EDT (14:11 UTC)
In effect from: Apr 19, 2011, 3:27 PM EDT
Expired: Apr 19, 2011, 3:25 PM EDT
In force
Issued by: NWS Baltimore/Washington
Flood severity: Minor

County Allegany County, MD

The radar

The Sterling radar (KLWX), 127 km from the middle of the area, began a volume at 14:11 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 Georges Creek near Franklin/Westernport (WSTM2). The gauge peaked at 7.46 ft at Apr 19, 2011, 3:00 PM EDT.

Action stage: 7 ft
Minor stage: 9.1 ft
Moderate stage: 11.1 ft
Major stage: 13.1 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01599000, 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 Apr 19, 5:50 AM EDT, 4 hours 21 minutes earlier.

Area forecast discussion, Apr 19, 5:50 AM EDT, 4 hours 21 minutes before

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Hazardous weather outlook, Apr 19, 10:02 AM EDT, 9 minutes before

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In the hours before

Local storm report, Apr 19, 4:43 AM EDT, 5 hours 28 minutes before

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Local storm report, Apr 19, 4:49 AM EDT, 5 hours 22 minutes before

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Local storm report, Apr 19, 4:51 AM EDT, 5 hours 20 minutes before

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Local storm report, Apr 19, 5:23 AM EDT, 4 hours 48 minutes before

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Special weather statement, Apr 19, 9:52 AM EDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
952 AM EDT TUE APR 19 2011

WVZ050-055-501>506-191445-
EASTERN PENDLETON WV-HARDY WV-HAMPSHIRE WV-WESTERN GRANT WV-
EASTERN GRANT WV-WESTERN MINERAL WV-EASTERN MINERAL WV-
WESTERN PENDLETON WV-
952 AM EDT TUE APR 19 2011

...STRONG THUNDERSTORMS TO AFFECT EASTERN PENDLETON...HARDY...
HAMPSHIRE...WESTERN GRANT...EASTERN GRANT...WESTERN MINERAL...EASTERN
MINERAL AND WESTERN PENDLETON COUNTIES...

AT 952 AM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 15 MILES WEST OF WILSONIA TO 13 MILES NORTHWEST
OF ONEGO TO 17 MILES WEST OF RIVERTON...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE HOPEVILLE...BAYARD...UPPER TRACT...ROUGH
RUN...MOOREFIELD AND WILLIAMSPORT.

THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

HEAVY RAIN WITH THIS STORM MAY REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.

WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS
STORM.

&&

LAT...LON 3879 7951 3883 7954 3888 7953 3889 7947
      3893 7946 3892 7938 3898 7934 3907 7930
      3911 7936 3921 7931 3918 7945 3919 7949
      3920 7949 3942 7914 3948 7910 3937 7880
      3904 7882 3874 7910 3868 7960
TIME...MOT...LOC 1352Z 258DEG 41KT 3918 7966 3898 7953
          3871 7967

GMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 1:15 AM EDT	Small Craft Advisory	LWX		67 hr
Apr 19, 7:33 AM EDT	Small Craft Advisory	LWX		60 hr
Apr 19, 9:54 AM EDT	Flood Watch	LWX	Clarke, Frederick, Shenandoah, City of Winchester	8 hr
Apr 19, 7:41 PM EDT	Special Marine Warning	LWX		50 min
Apr 19, 9:45 AM EDT	Areal Flood Warning	LWX	Allegany	6 hr
Apr 19, 12:17 PM EDT	Areal Flood Warning	LWX	Allegany	12 hr
Apr 19, 3:39 PM EDT	River Flood Warning	LWX	Garrett	4 hr
Apr 19, 3:47 PM EDT	Special Weather Statement	LWX	Howard, City of Baltimore	28 min
Apr 19, 4:58 PM EDT	Areal Flood Warning	LWX	Allegany	7 hr
Apr 19, 5:31 PM EDT	Special Weather Statement	LWX	Allegany	59 min
Apr 19, 9:52 AM EDT	Special Weather Statement	LWX	Grant, Mineral	53 min

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.