Alert archive / Virginia / Flash Flood Warnings in 2014
Flash Flood Warning 21, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jun 12, 2014, 3:24 PM EDT for Loudoun County, Virginia; Frederick County, Maryland. It was in force for 3 hr. 4 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
- Jun 12, 2014, 3:24 PM EDT (19:24 UTC)
- Expired
- Jun 12, 2014, 6:30 PM EDT
- In force
- 3 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
Counties Frederick County, MD, Loudoun County, VA
The radar
The Sterling radar (KLWX), 31 km from the middle of the area, began a volume at 19:27 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 12, 3:42 PM EDT | FLASH FLOOD | 2 Nw Leesburg, VA | EAST BOUND ROUTE 7 CLOSED AT WEST MARKET STREET DUE TO HIGH WATER |
| Jun 12, 4:01 PM EDT | FLASH FLOOD | 1 Se Paeonian Springs, VA | WATER 6-8 INCHES FLOWING OVER BRIDGEVIEW COURT NEAR THE INTERSECTION OF ROUTE 7 AND ROUTE 9 |
| Jun 12, 5:00 PM EDT | FLASH FLOOD | 2 Wnw Leesburg, VA | PORTION OF DRY MILL ROAD BETWEEN WOODBURN AND CAMBY ROADS WASHED AWAY NEAR GOOSE CREEK |
| Jun 12, 5:00 PM EDT | FLASH FLOOD | 2 Wnw Leesburg, VA | PORTION OF DRY MILL ROAD BETWEEN WOODBURN AND THOMAS MILL ROADS WASHED AWAY NEAR GOOSE CREEK |
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 12:00Z, 7.4 hours before the alert went out and 37 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
- 195 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 537 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
361
WGUS51 KLWX 121924
FFWLWX
MDC021-VAC107-122230-
/O.NEW.KLWX.FF.W.0021.140612T1924Z-140612T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
324 PM EDT THU JUN 12 2014
THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND...
CENTRAL LOUDOUN COUNTY IN NORTHERN VIRGINIA...
* UNTIL 630 PM EDT
* AT 318 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN CAPABLE OF PRODUCING FLASH FLOODING. RADAR
ESTIMATES THAT UP TO 1 INCH OF RAIN HAVE ALREADY FALLEN ACROSS
PORTIONS OF THE WARNED AREA. ADDITIONAL RAINFALL AMOUNTS OF UP TO 2
INCHES CAN BE EXPECTED.
* SOME LOCATIONS THAT ARE AFFECTED BY THE HEAVY RAIN INCLUDE
LEESBURG...BRUNSWICK AND POINT OF ROCKS.
THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
CATOCTIN CREEK...BROAD RUN...POTOMAC RIVER...DUTCHMAN CREEK...SOUTH
FORK CATOCTIN CREEK...GOOSE CREEK...NORTH FORK GOOSE CREEK...
BEAVERDAM CREEK...SOUTH FORK SYCOLIN CREEK...BIG BRANCH...SYCOLIN
CREEK...QUARTER BRANCH...TUSCARORA CREEK...CROOKED RUN...LIMESTONE
BRANCH AND NORTH FORK CATOCTIN CREEK.
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR
VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. FLOODWATER USUALLY IS
DEEPER THAN IT APPEARS. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. MAKE THE SMART CHOICE WHEN
FLOODED ROADS ARE ENCOUNTERED...TURN AROUND...DONT DROWN.
LAT...LON 3935 7750 3902 7754 3903 7770 3936 7766
3937 7765
$$1 follow-up statement
931
WGUS71 KLWX 122020
FFSLWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
420 PM EDT THU JUN 12 2014
MDC021-VAC107-122230-
/O.CON.KLWX.FF.W.0021.000000T0000Z-140612T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FREDERICK MD-LOUDOUN VA-
420 PM EDT THU JUN 12 2014
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
CENTRAL LOUDOUN AND SOUTHWESTERN FREDERICK COUNTIES...
AT 415 PM EDT...EMERGENCY MANAGEMENT REPORTED ROAD CLOSURES DUE TO
FLASH FLOODING FROM VERY HEAVY RAIN. ADDITIONAL RAINFALL AMOUNTS OF
UP TO 1 INCH ARE POSSIBLE.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LEESBURG...
BRUNSWICK...POINT OF ROCKS AND OATLANDS.
THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
CATOCTIN CREEK...BROAD RUN...POTOMAC RIVER...DUTCHMAN CREEK...SOUTH
FORK CATOCTIN CREEK...GOOSE CREEK...NORTH FORK GOOSE CREEK...
BEAVERDAM CREEK...SOUTH FORK SYCOLIN CREEK...BIG BRANCH...SYCOLIN
CREEK...QUARTER BRANCH...TUSCARORA CREEK...CROOKED RUN...LIMESTONE
BRANCH AND NORTH FORK CATOCTIN CREEK.
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR
VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. FLOODWATER USUALLY IS
DEEPER THAN IT APPEARS. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. MAKE THE SMART CHOICE WHEN
FLOODED ROADS ARE ENCOUNTERED...TURN AROUND...DONT DROWN.
LAT...LON 3935 7750 3902 7754 3903 7770 3936 7766
3937 7765
$$
DHThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 8:03 PM EDT | Special Marine Warning | LWX | 57 min | |
| Jun 11, 8:46 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Loudoun, City of Falls Church | 33 min |
| Jun 11, 9:39 PM EDT | Flash Flood Warning | LWX | Loudoun | 3 hr |
| Jun 11, 10:05 PM EDT | Coastal Flood Advisory | LWX | Arlington, City of Alexandria, City of Falls Church | 12 hr |
| Jun 11, 11:57 PM EDT | Special Marine Warning | LWX | 93 min | |
| Jun 12, 12:47 AM EDT | Areal Flood Warning | LWX | Loudoun | 4 hr |
| Jun 12, 1:02 AM EDT | Special Marine Warning | LWX | 88 min | |
| Jun 12, 1:46 AM EDT | Small Craft Advisory | LWX | 6 hr | |
| Jun 12, 3:48 AM EDT | Flash Flood Watch | LWX | Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 12 more | 20 hr |
| Jun 12, 6:52 AM EDT | Small Craft Advisory | LWX | 14 hr | |
| Jun 12, 3:55 PM EDT | Flash Flood Warning | LWX | Loudoun | 3 hr |
| Jun 12, 5:09 PM EDT | Coastal Flood Advisory | LWX | Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more | 18 hr |
| Jun 12, 6:25 PM EDT | Areal Flood Warning | LWX | Loudoun | 13 hr |
| Jun 12, 6:28 PM EDT | Flash Flood Warning | LWX | Greene, Madison | 3 hr |
| Jun 11, 9:32 PM EDT | Flash Flood Warning | LWX | Montgomery | 3 hr |
| Jun 11, 9:35 PM EDT | Flash Flood Warning | LWX | Washington | 3 hr |
| Jun 12, 3:03 PM EDT | Flash Flood Warning | LWX | Washington | 7 hr |
| Jun 12, 4:15 PM EDT | Flash Flood Warning | LWX | Frederick, Washington | 3 hr |
| Jun 12, 6:32 PM EDT | Flash Flood Warning | LWX | Allegany | 6 hr |
Nearby
Flash Flood Warnings in Virginia, 2014Flash Flood Warnings in Maryland, 2014Every flash flood warning in 2014
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.