Alert archive / Maryland / Flash Flood Warnings in 2011

Flash Flood Warning 113, NWS Baltimore/Washington

August 19, 2011Baltimore County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Aug 19, 2011, 6:00 PM EDT for Baltimore County, Maryland. It was in force for 118 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 19, 2011, 6:00 PM EDT (22:00 UTC)
Expired: Aug 19, 2011, 7:58 PM EDT
In force: 118 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

County Baltimore County, MD

The radar

The Sterling radar (KLWX), 98 km from the middle of the area, began a volume at 22:02 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.

What was reported inside it

Time	Report	Where	Remark
Aug 19, 6:10 PM EDT	FLASH FLOOD	1 E Carney, MD	DRY CREEK OVERFLOWED INTO FIELD
Aug 19, 6:40 PM EDT	FLASH FLOOD	North Point State Park, MD	WATER OVER ROADS WITHIN NORTH POINT STATE PARK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.0 hours before the alert went out and 33 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 146 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 359 m²/s²
0-3 km storm-relative helicity: 370 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

822 
WGUS51 KLWX 192200
FFWLWX
MDC005-200100-
/O.NEW.KLWX.FF.W.0113.110819T2200Z-110820T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
600 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN BALTIMORE COUNTY IN NORTHERN MARYLAND...

* UNTIL 900 PM EDT

* AT 559 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  RAPIDLY DEVELOPING THUNDERSTORMS WITH VERY HEAVY RAIN. SOIL        
  CONDITIONS IN THIS AREA ARE SATURATED...AND RAINFALL OF AT LEAST   
  AN INCH PER HOUR ARE EXPECTED IN SOUTHEASTERN BALTIMORE COUNTY FOR 
  THE NEXT HOUR OR TWO.

* SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY THE HEAVY RAIN
  INCLUDE BOWLEYS QUARTERS...CARNEY...DUNDALK...ESSEX...KINGSVILLE...
  MIDDLE RIVER...PARKVILLE...PERRY HALL...ROSEDALE...ROSSVILLE...
  WHITE MARSH...BACK RIVER...EASTPOINT...MILLERS ISLAND...NORTH POINT
  STATE PARK AND TURNERS STATION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3930 7636 3925 7640 3926 7637 3924 7636
      3919 7643 3921 7650 3925 7653 3936 7653
      3937 7656 3943 7658 3951 7653 3947 7640
      3933 7632 3930 7631

$$

JE

2 follow-up statements

064 
WGUS71 KLWX 192242
FFSLWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
642 PM EDT FRI AUG 19 2011

MDC005-200100-
/O.CON.KLWX.FF.W.0113.000000T0000Z-110820T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALTIMORE MD-
642 PM EDT FRI AUG 19 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM EDT FOR
SOUTHEASTERN BALTIMORE COUNTY...

AT 640 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
RAIN WAS ENDING ACROSS SOUTHEASTERN BALTIMORE COUNTY. RAINFALL OF 
ONE TO TWO INCHES...WITH ISOLATED HIGHER AMOUNTS...HAS OCCURRED IN 
THE LAST HOUR. REPORTS OF STREET FLOODING HAVE BEEN RECEIVED NEAR 
ROSEDALE AND PARKVILLE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WHITE
MARSH...ROSSVILLE...ROSEDALE...PERRY HALL...PARKVILLE...KINGSVILLE
AND CARNEY

FLASH FLOOD PRONE AREAS WHICH MAY BE AFFECTED INCLUDE...
  PHILADELPHIA ROAD NEAR FORGE ROAD...
  PULASKI HIGHWAY NEAR ROSEDALE AVENUE...
  GLEN ARM ROAD NEAR GUNPOWDER ROAD...
  LONG GREEN PIKE NEAR LONG GREEN ROAD...
  GOLDEN RING ROAD BETWEEN RACE ROAD AND OREMS ROAD...
  KELSO ROAD NEAR GOLDEN RING ROAD...
  OREMS ROAD NEAR MACE AVENUE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3930 7636 3925 7640 3926 7637 3924 7636
      3919 7643 3921 7650 3925 7653 3936 7653
      3937 7656 3943 7658 3951 7653 3947 7640
      3933 7632 3930 7631

$$

JE

786 
WGUS71 KLWX 192358
FFSLWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
758 PM EDT FRI AUG 19 2011

MDC005-200008-
/O.CAN.KLWX.FF.W.0113.000000T0000Z-110820T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALTIMORE MD-
758 PM EDT FRI AUG 19 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN
BALTIMORE COUNTY...

RAIN HAS ENDED ACROSS THE AREA...AND SMALL STREAMS ARE NEAR CREST AT 
THIS TIME IN THE WHITE MARSH AREA. ADDITIONAL FLOODING IS NOT 
EXPECTED.

LAT...LON 3930 7636 3925 7640 3926 7637 3924 7636
      3919 7643 3921 7650 3925 7653 3936 7653
      3937 7656 3943 7658 3951 7653 3947 7640
      3933 7632 3930 7631

$$

JE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:23 PM EDT	Special Weather Statement	LWX	Washington	37 min
Aug 18, 8:30 PM EDT	Severe Thunderstorm Warning	LWX	Washington	30 min
Aug 18, 9:29 PM EDT	Special Weather Statement	LWX	Washington	46 min
Aug 18, 9:39 PM EDT	Severe Thunderstorm Warning	LWX	Washington	51 min
Aug 18, 10:11 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	49 min
Aug 18, 10:36 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	39 min
Aug 18, 11:16 PM EDT	Special Weather Statement	LWX	Carroll, Howard, Montgomery	29 min
Aug 18, 11:53 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford	52 min
Aug 18, 11:58 PM EDT	Special Weather Statement	LWX	Baltimore, Howard, Montgomery, City of Baltimore	32 min
Aug 19, 11:54 AM EDT	Flash Flood Watch	LWX	Anne Arundel, Baltimore, Carroll, Prince George's, City of Baltimore	8 hr
Aug 19, 2:02 PM EDT	Special Weather Statement	LWX	Allegany	28 min
Aug 19, 2:32 PM EDT	Special Weather Statement	LWX	Allegany	13 min
Aug 19, 2:46 PM EDT	Special Weather Statement	LWX	Frederick	14 min
Aug 19, 2:57 PM EDT	Special Weather Statement	LWX	Calvert	33 min
Aug 19, 3:21 PM EDT	Special Weather Statement	LWX	Calvert	24 min
Aug 19, 3:25 PM EDT	Special Weather Statement	LWX	Allegany	35 min
Aug 19, 3:54 PM EDT	Severe Thunderstorm Warning	LWX	Washington	32 min
Aug 19, 4:16 PM EDT	Special Weather Statement	LWX	Calvert	29 min
Aug 19, 4:45 PM EDT	Special Weather Statement	LWX	Calvert	30 min
Aug 19, 4:51 PM EDT	Special Weather Statement	LWX	Carroll	39 min
Aug 19, 4:53 PM EDT	Severe Thunderstorm Warning	LWX	Washington	39 min
Aug 19, 5:15 PM EDT	Flash Flood Warning	LWX	Allegany	3 hr
Aug 19, 5:15 PM EDT	Special Weather Statement	LWX	Baltimore	30 min
Aug 19, 5:17 PM EDT	Special Weather Statement	LWX	Baltimore	28 min
Aug 19, 5:19 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford	41 min
Aug 19, 5:21 PM EDT	Special Weather Statement	LWX	Saint Mary's	24 min
Aug 19, 5:31 PM EDT	Special Weather Statement	LWX	Calvert	29 min
Aug 19, 5:40 PM EDT	Special Weather Statement	LWX	City of Baltimore	35 min
Aug 19, 5:43 PM EDT	Special Weather Statement	LWX	Baltimore	47 min
Aug 19, 5:45 PM EDT	River Flood Warning	LWX	Allegany	3 hr
Aug 19, 5:51 PM EDT	Special Weather Statement	LWX	Harford	24 min
Aug 19, 5:54 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford, City of Baltimore	51 min
Aug 19, 6:03 PM EDT	Special Weather Statement	LWX	Prince George's	27 min
Aug 19, 6:14 PM EDT	Special Weather Statement	LWX	Harford	31 min
Aug 19, 6:26 PM EDT	Special Weather Statement	LWX	Anne Arundel	34 min
Aug 19, 6:30 PM EDT	Special Weather Statement	LWX	Prince George's	30 min
Aug 19, 6:36 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, City of Baltimore	54 min
Aug 19, 6:39 PM EDT	Severe Thunderstorm Warning	LWX	Charles	47 min
Aug 19, 6:40 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Prince George's	50 min
Aug 19, 6:44 PM EDT	Special Weather Statement	LWX	Harford	31 min
Aug 19, 6:54 PM EDT	Special Weather Statement	LWX	Anne Arundel	36 min
Aug 19, 7:05 PM EDT	Special Weather Statement	LWX	Prince George's	25 min
Aug 19, 7:13 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Prince George's	35 min
Aug 19, 7:28 PM EDT	Flash Flood Warning	LWX	Prince George's	101 min
Aug 19, 7:54 PM EDT	Special Weather Statement	LWX	Prince George's	36 min

Nearby

Flash Flood Warnings in Maryland, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.