Alert archive / Virginia / Flash Flood Warnings in 2012
Flash Flood Warning 2, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at May 21, 2012, 11:57 PM EDT for Prince William County, City of Manassas, Virginia. It was in force for 3 hr. 14 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
- May 21, 2012, 11:57 PM EDT (03:57 UTC)
- Expired
- May 22, 2012, 3:00 AM EDT
- In force
- 3 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
The radar
The Sterling radar (KLWX), 24 km from the middle of the area, began a volume at 04:00 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 |
|---|---|---|---|
| May 22, 12:02 AM EDT | FLASH FLOOD | 2 Ese Gainesville, VA | WELLINGTON ROAD AT PINEY BRANCH LANE CLOSED DUE TO FLOODING |
| May 22, 12:20 AM EDT | FLASH FLOOD | Gainesville, VA | JOHN MARSHALL HIGHWAY AND CARTHARPIN ROAD CLOSED DUE TO HIGH WATER |
| May 22, 12:30 AM EDT | FLASH FLOOD | 2 Ne Nokesville, VA | NOKESVILLE ROAD AT AIDEN ROAD SR 646 CLOSED DUE TO WATER OVER THE ROAD |
| May 22, 12:30 AM EDT | FLASH FLOOD | 3 Se Gainesville, VA | DEVLIN ROAD AT ASHELEYS PARK LANE CLOSED DUE TO WATER OVER THE ROAD. |
| May 22, 12:30 AM EDT | FLASH FLOOD | 3 W Bull Run, VA | DEVLIN ROAD AT JENNELL DRIVE CLOSED DUE TO HIGH WATER |
| May 22, 12:54 AM EDT | FLASH FLOOD | 2 Se Gainesville, VA | LINTON HALL ROAD AT HARNESS SHOP ROAD CLOSED DUE TO FLOODING. |
| May 22, 1:07 AM EDT | FLASH FLOOD | 2 Wnw Bull Run, VA | PRINCE WILLIAM PARKWAY AT BALLS FORD ROAD CLOSED DUE TO FLOODING. |
| May 22, 1:22 AM EDT | FLASH FLOOD | 2 Ene Gainesville, VA | US 29 LEE HIGHWAY AND PAGELAND LANE CLOSED DUE TO FLOODING |
| May 22, 1:24 AM EDT | FLASH FLOOD | Catharpin, VA | SANDERS LANE AT SUDLEY ROAD CLOSED DUE TO FLOODING |
| May 22, 1:26 AM EDT | FLASH FLOOD | 2 S Catharpin, VA | PAGELAND LANE AT ARTEMUS ROAD CLOSED DUE TO FLOODING. |
| May 22, 1:29 AM EDT | FLASH FLOOD | 1 N Gainesville, VA | HEATHCOTE BLVD AT CARTHARPIN ROAD CLOSED DUE TO FLOODING. |
| May 22, 1:30 AM EDT | FLASH FLOOD | Aden, VA | SWIFT WATER RESCUE. |
| May 22, 2:00 AM EDT | FLASH FLOOD | 1 Se Aden, VA | SECTION OF ADEN ROAD AT MISTY CREEK COURT WAS WASHED OUT DUE TO HEAVY RAINFALL LEADING TO FLASH FLOODING. TIME OF WASHOUT IS ESTIMATED. |
| May 22, 3:00 AM EDT | FLASH FLOOD | 2 N Aden, VA | PART OF ROADWAY WASHED OUT DUE TO FLASH FLOODING ALONG VALLEY VIEW DR NEAR NOKESVILLE. TIME IS ESTIMATED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 4.0 hours before the alert went out and 24 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.
- Mixed-layer CAPE
- 278 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 601 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
476 WGUS51 KLWX 220357 FFWLWX VAC153-683-220700- /O.NEW.KLWX.FF.W.0002.120522T0357Z-120522T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1157 PM EDT MON MAY 21 2012 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * FLASH FLOOD WARNING FOR... CITY OF MANASSAS IN NORTHERN VIRGINIA... WESTERN PRINCE WILLIAM COUNTY IN NORTHERN VIRGINIA... * UNTIL 300 AM EDT * AT 1149 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM MANASSAS...HAYMARKET...AND NOKESVILLE SOUTHWARD INTO EASTERN FAUQUIER COUNTY. THIS RAIN IS TRAINING REPEATEDLY OVER THE SAME AREA. * SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY THE HEAVY RAIN INCLUDE BULL RUN AND MANASSAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGE... LITTLE BULL RUN...BULL RUN...ROCKY BRANCH...BROAD RUN...CEDAR RUN... LICK BRANCH...DAWKINS BRANCH...CANNON BRANCH...SOUTH RUN...KETTLE RUN...OCCOQUAN RIVER...CABIN RUN...YOUNGS BRANCH...HOLKUMS BRANCH AND CATHARPIN CREEK. RAINFALL AMOUNTS OF 2 TO 3 INCHES HAVE FALLEN THIS EVENING...AND ADDITIONAL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE. 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. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. && LAT...LON 3886 7758 3875 7744 3862 7755 3876 7766 $$ KONARIK
1 follow-up statement
191 WGUS71 KLWX 220448 FFSLWX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1248 AM EDT TUE MAY 22 2012 VAC153-683-220700- /O.CON.KLWX.FF.W.0002.000000T0000Z-120522T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CITY OF MANASSAS VA-PRINCE WILLIAM VA- 1248 AM EDT TUE MAY 22 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 AM EDT FOR WESTERN PRINCE WILLIAM AND CITY OF MANASSAS COUNTIES... AT 1241 AM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED NUMEROUS ROADS CLOSED BETWEEN NOKESVILLE AND GAINESVILLE DUE TO FLASH FLOODING. VERY HEAVY RAIN CONTINUES OVER THE WARNED AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... RAINFALL AMOUNTS OF 2 TO 4 INCHES HAVE FALLEN...AND ADDITIONAL AMOUNTS OF 1 TO 2 INCHES ARE LIKELY. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. && LAT...LON 3886 7758 3875 7744 3862 7755 3876 7766 $$ KONARIK
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 8:58 PM EDT | Coastal Flood Advisory | LWX | Arlington, City of Alexandria, City of Falls Church | 15 hr |
| May 21, 11:17 PM EDT | Special Weather Statement | LWX | Loudoun, Prince William, City of Manassas, City of Manassas Park | 88 min |
| May 22, 12:58 AM EDT | Special Weather Statement | LWX | Prince William, Spotsylvania, Stafford, City of Fredericksburg, City of Manassas, City of Manassas Park | 92 min |
| May 22, 1:05 AM EDT | Flash Flood Warning | LWX | Loudoun | 3 hr |
| May 22, 1:26 AM EDT | Flash Flood Warning | LWX | Fauquier, Prince William, Stafford, City of Manassas | 3 hr |
| May 22, 7:21 AM EDT | Areal Flood Warning | LWX | Fauquier, Prince William, City of Manassas, City of Manassas Park | 7 hr |
| May 22, 2:18 PM EDT | Areal Flood Warning | LWX | Prince William, City of Manassas, City of Manassas Park | 3 hr |
| May 22, 5:06 PM EDT | Special Weather Statement | LWX | Albemarle, City of Charlottesville | 39 min |
| May 22, 5:40 PM EDT | Special Weather Statement | LWX | Albemarle | 65 min |
| May 22, 6:01 PM EDT | Severe Thunderstorm Warning | LWX | Nelson | 29 min |
| May 22, 7:16 PM EDT | Flash Flood Watch | LWX | Clarke, Fauquier | 8 hr |
Nearby
Flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.