Alert archive / Maryland / Flash Flood Warnings in 2012

Flash Flood Warning 7, NWS Wakefield, VA

August 25, 2012Somerset County, Worcester County, Maryland; Accomack County, Virginia

NWS Wakefield, VA issued this flash flood warning at Aug 25, 2012, 4:54 PM EDT for Somerset County, Worcester County, Maryland; Accomack County, Virginia. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 25, 2012, 4:54 PM EDT (20:54 UTC)
Expired
Aug 25, 2012, 5:44 PM EDT
In force
50 min
Issued by
NWS Wakefield, VA
Area
Storm-based polygon
Flood severity
None

Counties Somerset County, MD, Worcester County, MD, Accomack County, VA

The radar

The Dover AFB radar (KDOX), 103 km from the middle of the area, began a volume at 20:57 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 nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.9 hours before the alert went out and 6 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2012-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 86 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2012-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
86 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
860 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
64 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.

867 
WGUS51 KAKQ 252054
FFWAKQ
MDC039-047-VAC001-252245-
/O.NEW.KAKQ.FF.W.0007.120825T2054Z-120825T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WAKEFIELD VA
454 PM EDT SAT AUG 25 2012

THE NATIONAL WEATHER SERVICE IN WAKEFIELD HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME SOUTHWESTERN WORCESTER COUNTY...
  SOUTHEASTERN SOMERSET COUNTY...
  NORTHEASTERN ACCOMACK COUNTY...

* UNTIL 645 PM EDT...

* AT 448 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 14
  MILES WEST OF CHINCOTEAGUE TO 19 MILES SOUTH OF CHINCOTEAGUE...OR
  ALONG A LINE EXTENDING FROM 8 MILES SOUTH OF POCOMOKE CITY TO 19
  MILES SOUTH OF CHINCOTEAGUE...MOVING NORTH AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CHINCOTEAGUE...OAK HALL...AND MAPPSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

&&

LAT...LON 3788 7538 3787 7540 3788 7541 3784 7547
      3773 7555 3783 7570 3803 7566 3797 7542
      3795 7541 3796 7540 3794 7532

$$

WRS
1 follow-up statement
507 
WGUS71 KAKQ 252144
FFSAKQ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
544 PM EDT SAT AUG 25 2012

MDC039-047-VAC001-252152-
/O.CAN.KAKQ.FF.W.0007.000000T0000Z-120825T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WORCESTER MD-SOMERSET MD-ACCOMACK VA-
544 PM EDT SAT AUG 25 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
ACCOMACK...SOUTHEASTERN SOMERSET AND EXTREME SOUTHWESTERN WORCESTER
COUNTIES...

THE HEAVY RAINFALL WHICH PRODUCED FLASH FLOODING OVER CENTRAL AND 
WESTERN PARTS OF ACCOMACK COUNTY HAS ENDED. ALTHOUGH SHOWERS AND 
THUNDERSTORMS WILL PERSIST FOR ANOTHER 1 TO 2 HOURS ACROSS THE 
NORTHEAST PART OF ACCOMACK COUNTY...THEN RAINFALL IS NOT EXPECTED TO 
BE HEAVY ENOUGH TO CAUSE FLASH FLOODING. HOWEVER...MOTORISTS ARE 
STILL URGED TO USE EXTRA CAUTION WHILE TRAVELING IN AREAS AFFECTED 
BY SHOWERS AND THUNDERSTORMS THIS EVENING.

LAT...LON 3788 7538 3787 7540 3788 7541 3784 7547
      3773 7555 3783 7570 3803 7566 3797 7542
      3795 7541 3796 7540 3794 7532
TIME...MOT...LOC 2142Z 180DEG 17KT 3821 7536 3793 7536

$$

WRS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 3:03 PM EDTFlash Flood WarningAKQSomerset, Worcester117 min
Aug 25, 4:34 PM EDTAreal Flood AdvisoryAKQSomerset, Wicomico, Worcester116 min
Aug 25, 5:49 PM EDTSpecial Weather StatementAKQWorcester56 min
Aug 25, 6:34 PM EDTSpecial Weather StatementAKQWorcester56 min
Aug 25, 7:23 PM EDTAreal Flood AdvisoryAKQWicomico, Worcester3 hr
Aug 25, 2:01 AM EDTSpecial Marine WarningAKQ59 min
Aug 25, 2:54 AM EDTSpecial Marine WarningAKQ81 min
Aug 25, 3:38 AM EDTSpecial Weather StatementAKQGreensville, City of Emporia37 min
Aug 25, 5:16 AM EDTSpecial Weather StatementAKQBrunswick, Dinwiddie, Greensville, Prince George, Surry, Sussex and 7 more119 min
Aug 25, 5:30 AM EDTSevere Thunderstorm WarningAKQIsle of Wight, City of Hampton, City of Newport News, City of Portsmouth, City of Suffolk45 min
Aug 25, 5:39 AM EDTSpecial Marine WarningAKQ81 min
Aug 25, 6:16 AM EDTSpecial Weather StatementAKQCity of Newport News59 min
Aug 25, 6:48 AM EDTFlash Flood WarningAKQYork, City of Hampton, City of Newport News, City of Poquoson117 min
Aug 25, 6:58 AM EDTAreal Flood AdvisoryAKQBrunswick, Greensville, City of Emporia2 hr
Aug 25, 8:25 AM EDTSpecial Weather StatementAKQBrunswick, Greensville, Southampton, Sussex, City of Emporia65 min
Aug 25, 9:14 AM EDTSpecial Marine WarningAKQ46 min
Aug 25, 9:16 AM EDTAreal Flood AdvisoryAKQDinwiddie, Greensville, Prince George, Southampton, Surry, Sussex and 1 more104 min
Aug 25, 9:16 AM EDTSpecial Marine WarningAKQ44 min
Aug 25, 9:54 AM EDTSpecial Marine WarningAKQ51 min
Aug 25, 9:55 AM EDTSpecial Marine WarningAKQ35 min
Aug 25, 10:04 AM EDTSpecial Weather StatementAKQNorthampton56 min
Aug 25, 10:13 AM EDTTornado WarningAKQCity of Norfolk, City of Portsmouth32 min
Aug 25, 10:15 AM EDTSpecial Marine WarningAKQ37 min
Aug 25, 10:34 AM EDTSpecial Marine WarningAKQ41 min
Aug 25, 10:56 AM EDTSpecial Weather StatementAKQCharles City, Hanover, Henrico, James City, New Kent, Prince George and 3 more64 min
Aug 25, 10:59 AM EDTSpecial Weather StatementAKQGloucester, Mathews, York, City of Hampton, City of Poquoson61 min
Aug 25, 11:14 AM EDTSpecial Weather StatementAKQAccomack61 min
Aug 25, 11:51 AM EDTSpecial Weather StatementAKQCharles City, Isle of Wight, James City, King William, New Kent, Surry and 3 more54 min
Aug 25, 11:56 AM EDTAreal Flood AdvisoryAKQAccomack, Northampton3 hr
Aug 25, 11:58 AM EDTAreal Flood AdvisoryAKQCharles City, Isle of Wight, James City, Prince George, Surry, Sussex92 min
Aug 25, 12:39 PM EDTAreal Flood AdvisoryAKQIsle of Wight, Southampton81 min
Aug 25, 12:56 PM EDTTornado WarningAKQAccomack34 min
Aug 25, 12:58 PM EDTSpecial Marine WarningAKQ62 min
Aug 25, 1:11 PM EDTAreal Flood AdvisoryAKQGloucester, Isle of Wight, James City, Mathews, Surry, York and 3 more109 min
Aug 25, 1:17 PM EDTFlash Flood WarningAKQAccomack88 min
Aug 25, 2:37 PM EDTAreal Flood AdvisoryAKQIsle of Wight, York, City of Hampton, City of Newport News, City of Poquoson, City of Portsmouth and 1 more3 hr
Aug 25, 2:37 PM EDTTornado WarningAKQAccomack38 min
Aug 25, 2:42 PM EDTSpecial Marine WarningAKQ93 min
Aug 25, 3:13 PM EDTRiver Flood WarningAKQBrunswick6 hr
Aug 25, 3:40 PM EDTSpecial Marine WarningAKQ95 min
Aug 25, 5:13 PM EDTSpecial Marine WarningAKQ77 min
Aug 25, 5:22 PM EDTSpecial Weather StatementAKQDinwiddie53 min
Aug 25, 6:26 PM EDTSpecial Weather StatementAKQDinwiddie, Southampton, Sussex64 min
Aug 25, 6:44 PM EDTSpecial Weather StatementAKQCumberland46 min
Aug 25, 7:28 PM EDTSpecial Weather StatementAKQAmelia, City of Petersburg62 min
Aug 25, 7:41 PM EDTAreal Flood AdvisoryAKQAmelia, Cumberland, Powhatan, Prince Edward3 hr

Nearby

Flash Flood Warnings in Maryland, 2012Flash Flood Warnings in Virginia, 2012Every flash flood warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.