Alert archive / Maryland / Flash Flood Warnings in 2011

Flash Flood Warning 2, NWS Wakefield, VA

June 19, 2011Somerset County, Maryland; Accomack County, Virginia

NWS Wakefield, VA issued this flash flood warning at Jun 19, 2011, 12:06 PM EDT for Somerset County, Maryland; Accomack County, Virginia. It was in force for 84 min. 1 report 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: Jun 19, 2011, 12:06 PM EDT (16:06 UTC)
Expired: Jun 19, 2011, 1:30 PM EDT
In force: 84 min
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Flood severity: None

Counties Somerset County, MD, Accomack County, VA

The radar

The Dover AFB radar (KDOX), 107 km from the middle of the area, began a volume at 16:06 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
Jun 19, 12:30 PM EDT	FLASH FLOOD	Bloxom, VA	HIGH WATER COVERING ROUTES 316 AND 182.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 4.1 hours before the alert went out and 29 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: 333 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 918 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 104 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.

495 
WGUS51 KAKQ 191606
FFWAKQ
MDC039-VAC001-191730-
/O.NEW.KAKQ.FF.W.0002.110619T1606Z-110619T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WAKEFIELD VA
1206 PM EDT SUN JUN 19 2011

THE NATIONAL WEATHER SERVICE IN WAKEFIELD HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL SOMERSET COUNTY IN SOUTHEAST MARYLAND...
  CENTRAL ACCOMACK COUNTY IN SOUTHEAST VIRGINIA...

* UNTIL 130 PM EDT

* AT 1154 AM EDT...TRAINED WEATHER SPOTTERS REPORTED FLASH      
FLOODING FROM THUNDERSTORMS WITH HEAVY RAINFALL NEAR THE CITY OF 
BLOXOM. RADAR STORM ESTIMATES INDICATED RAINFALL AMOUNTS OF OVER 3 
INCHES FROM NEAR LAWSONIA TO SAXIS TO BLOXOM. ADDITIONAL HEAVY 
RAINFALL IS EXPECTED OVER THE AREA OVER THE NEXT HOUR OR TWO.   

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE INCH OR MORE IS POSSIBLE IN THE 
WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&& LAT...LON 3779 7571 3783 7573 3786 7570 3785 7573
      3786 7574 3788 7570 3789 7571 3789 7576
      3791 7577 3794 7572 3795 7567 3797 7578
      3795 7581 3798 7583 3803 7571 3781 7555

$$

JFOSTER

The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 8:17 PM EDT	Special Weather Statement	AKQ	Worcester	28 min
Jun 19, 10:21 AM EDT	Special Weather Statement	AKQ	Somerset	69 min
Jun 19, 11:28 AM EDT	Areal Flood Advisory	AKQ	Somerset, Worcester	92 min
Jun 18, 8:08 PM EDT	Special Weather Statement	AKQ	Southampton, City of Franklin	22 min
Jun 18, 8:36 PM EDT	Special Weather Statement	AKQ	City of Chesapeake, City of Norfolk, City of Virginia Beach	39 min
Jun 19, 6:18 AM EDT	Special Weather Statement	AKQ	Essex, King William, Richmond	57 min
Jun 19, 7:42 AM EDT	Special Weather Statement	AKQ	Essex, Northumberland, Richmond, Westmoreland	63 min

Nearby

Flash Flood Warnings in Maryland, 2011 Flash Flood Warnings in Virginia, 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.