Alert archive / Maryland / Flash Flood Warnings in 2012

Flash Flood Warning 21, NWS Baltimore/Washington

June 1, 2012Baltimore County, Harford County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jun 1, 2012, 6:16 PM EDT for Baltimore County, Harford County, Maryland. It was in force for 6 hr. 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 1, 2012, 6:16 PM EDT (22:16 UTC)
Expired: Jun 1, 2012, 11:52 PM EDT
In force: 6 hr
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

Counties Baltimore County, MD, Harford County, MD

The radar

The Dover AFB radar (KDOX), 116 km from the middle of the area, began a volume at 22:16 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 1, 6:30 PM EDT	FLASH FLOOD	Fork, MD	MD-147 FROM FORK RD TO GLEN ARM RD WAS CLOSED

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, 10.3 hours before the alert went out and 118 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: 26 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 174 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.

557 
WGUS51 KLWX 012216
FFWLWX
MDC005-025-020115-
/O.NEW.KLWX.FF.W.0021.120601T2216Z-120602T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
616 PM EDT FRI JUN 1 2012

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HARFORD COUNTY IN NORTHERN MARYLAND...
  EAST CENTRAL BALTIMORE COUNTY IN NORTHERN MARYLAND...

* UNTIL 915 PM EDT

* AT 610 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED      
  THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING MOVING NORTHEAST AT 
  25 MPH REPEATED ACROSS THE WARNED AREA.

* SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY THE HEAVY RAIN
  INCLUDE BEL AIR...CARNEY...COCKEYSVILLE...FALLSTON...
  JARRETTSVILLE...KINGSVILLE...PERRY HALL...PLEASANT HILLS...
  ROSSVILLE...TIMONIUM AND WHITE MARSH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RAINFALL AMOUNTS OF 1 TO 2 INCHES HAVE FALLEN AND ADDITIONAL  AMOUNTS 
OF 1 TO 2 INCHES ARE 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.

&&

LAT...LON 3970 7622 3965 7615 3961 7613 3931 7643
      3946 7666 3973 7653 3972 7623

$$
KONARIK

4 follow-up statements

355 
WGUS71 KLWX 012350
FFSLWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
750 PM EDT FRI JUN 1 2012

MDC005-025-020115-
/O.CON.KLWX.FF.W.0021.000000T0000Z-120602T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARFORD MD-BALTIMORE MD-
750 PM EDT FRI JUN 1 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM EDT FOR EAST
CENTRAL BALTIMORE AND HARFORD COUNTIES...

AT 744 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS CONTINUED TO REPORT 
ROAD CLOSURES DUE TO FLASH FLOODING.  THUNDERSTORMS CONTINUE TO TRAIN 
NORTHEAST AT 25 MPH ACROSS THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RAINFALL AMOUNTS OF 2 TO 3 INCHES HAVE FALLEN AND ADDITIONAL AMOUNTS OF 
1 TO 3 INCHES ARE POSSIBLE.

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.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
STERLING VIRGINIA.

&&

LAT...LON 3970 7622 3965 7615 3961 7613 3931 7643
      3946 7666 3973 7653 3972 7623

$$
KONARIK

430 
WGUS51 KLWX 020100
FFWLWX
MDC005-025-020415-
/O.EXT.KLWX.FF.W.0021.000000T0000Z-120602T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
900 PM EDT FRI JUN 1 2012

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  HARFORD COUNTY IN NORTHERN MARYLAND...
  EAST CENTRAL BALTIMORE COUNTY IN NORTHERN MARYLAND...

* UNTIL 1215 AM EDT

* AT 853 PM EDT...FLASH FLOODING WAS FORCING THE CLOSURE OF SEVERAL     
  ROADWAYS IN HARFORD AND BALTIMORE COUNTIES.  RAINFALL AMOUNTS OF 2 TO 
  3 INCHES HAVE CAUSED RAPID RISES IN CREEKS AND STREAMS...AND          
  ADDITIONAL THUNDERSTORMS MOVING IN FROM THE WEST WILL WORSE ONGOING   
  FLASH FLOODING AND BRING THE THREAT OF NEW FLASH FLOODING..

* SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY THE HEAVY RAIN
  INCLUDE BEL AIR...CARNEY...COCKEYSVILLE...FALLSTON...
  JARRETTSVILLE...KINGSVILLE...PERRY HALL...PLEASANT HILLS...
  ROSSVILLE...TIMONIUM AND WHITE MARSH.

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. DO NOT ATTEMPT TO CROSS 
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY 
AUTOMOBILE.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.

&&

LAT...LON 3970 7622 3965 7615 3961 7613 3931 7643
      3946 7666 3973 7653 3972 7623

$$
KONARIK

158 
WGUS71 KLWX 020324
FFSLWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1124 PM EDT FRI JUN 1 2012

MDC005-025-020415-
/O.CON.KLWX.FF.W.0021.000000T0000Z-120602T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARFORD MD-BALTIMORE MD-
1124 PM EDT FRI JUN 1 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT FOR
CENTRAL BALTIMORE AND NORTHWESTERN HARFORD COUNTIES...

AT 1119 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING HEAVY DOWNPOURS OVER THE WARNED 
AREA. IT WILL NOT TAKE MUCH ADDITIONAL RAINFALL FOR CREEKS AND 
STREAMS TO RISE BACK OUT OF THEIR BANKS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO JARRETTSVILLE

FLASH FLOOD PRONE AREAS WHICH WILL CONTINUE TO BE AFFECTED INCLUDE...
  BEAVER DAM ROAD NEAR TEXAS STATION COURT...
  GLEN ARM ROAD NEAR GUNPOWDER ROAD...
  LONG GREEN PIKE NEAR LONG GREEN ROAD...
  BEAVER DAM ROAD NEAR COCKEYSVILLE ROAD...
  PHOENIX ROAD NEAR CARROLL ROAD...
  GREEN ROAD NEAR THE BALTIMORE-HARFORD COUNTY LINE...
  WALTERS MILL ROAD AT ADY ROAD...
  BEL AIR ROAD AT LITTLE GUNPOWDER FALLS...
  PATTERSON MILL ROAD AT WHEEL ROAD...
  SHAWNEE DRIVE AT WALTERS MILL ROAD...
  SANDY HOOK ROAD NEAR DEER CREEK...
  DARLINGTON ROAD AT DEER CREEK ROAD...
  ROUTE 1 NEAR BYNUM RUN...
  MOORES MILL ROAD AT BYNUM RUN...
  SOUTHAMPTON ROAD AT BYNUM RUN...
  FOXBOROUGH DRIVE...
  PLUMTREE ROAD AT PLUMTREE RUN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE-HALF TO THREE-QUARTERS INCH ARE 
POSSIBLE IN THE WARNED AREA.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM EDT SATURDAY MORNING 
FOR PORTIONS OF MARYLAND.

&&

LAT...LON 3970 7622 3965 7615 3963 7614 3935 7649
      3946 7666 3973 7653 3972 7623

$$

JRK

324 
WGUS71 KLWX 020352
FFSLWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1152 PM EDT FRI JUN 1 2012

MDC005-025-020400-
/O.CAN.KLWX.FF.W.0021.000000T0000Z-120602T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARFORD MD-BALTIMORE MD-
1152 PM EDT FRI JUN 1 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL BALTIMORE
AND NORTHWESTERN HARFORD COUNTIES...

FLOODING CONTINUES...BUT ADDITIONAL RAPID RISES ARE NOT EXPECTED. 
THEREFORE THE FLASH FLOOD WARNING HAS BEEN REPLACED BY A FLOOD 
WARNING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM EDT SATURDAY MORNING
FOR MARYLAND.

LAT...LON 3970 7622 3965 7615 3963 7614 3935 7649
      3946 7666 3973 7653 3972 7623

$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 1, 1:47 PM EDT	Special Weather Statement	LWX	Montgomery	43 min
Jun 1, 1:49 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Montgomery	41 min
Jun 1, 2:05 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Howard, Montgomery	40 min
Jun 1, 2:16 PM EDT	Tornado Warning	LWX	Carroll, Frederick, Howard, Montgomery	29 min
Jun 1, 2:19 PM EDT	Tornado Warning	LWX	Montgomery	26 min
Jun 1, 2:35 PM EDT	Tornado Warning	LWX	Carroll, Frederick, Howard, Montgomery	25 min
Jun 1, 2:38 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Howard, Montgomery	52 min
Jun 1, 2:44 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	46 min
Jun 1, 2:54 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Howard, Montgomery	66 min
Jun 1, 2:54 PM EDT	Tornado Warning	LWX	Carroll	51 min
Jun 1, 3:06 PM EDT	Tornado Warning	LWX	Carroll, Howard, Montgomery	24 min
Jun 1, 3:18 PM EDT	Flash Flood Warning	LWX	Carroll, Frederick, Howard, Montgomery	6 hr
Jun 1, 3:23 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Howard, Montgomery, Prince George's	52 min
Jun 1, 3:30 PM EDT	Tornado Warning	LWX	Baltimore, Carroll, Harford	45 min
Jun 1, 3:40 PM EDT	Flash Flood Watch	LWX	Allegany, Baltimore, Carroll, Frederick, Prince George's, Washington and 1 more	8 hr
Jun 1, 3:47 PM EDT	Severe Thunderstorm Warning	LWX	Charles, Prince George's	43 min
Jun 1, 4:07 PM EDT	Flash Flood Warning	LWX	Baltimore, Carroll	6 hr
Jun 1, 4:12 PM EDT	Tornado Warning	LWX	Charles, Prince George's	33 min
Jun 1, 4:13 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Howard, Montgomery, Prince George's	32 min
Jun 1, 4:22 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll	23 min
Jun 1, 4:24 PM EDT	Tornado Warning	LWX	Baltimore, Carroll	36 min
Jun 1, 4:29 PM EDT	Severe Thunderstorm Warning	LWX	Charles, Prince George's	46 min
Jun 1, 4:31 PM EDT	Tornado Warning	LWX	Anne Arundel, Baltimore, Howard	29 min
Jun 1, 4:43 PM EDT	Tornado Warning	LWX	Prince George's	32 min
Jun 1, 4:46 PM EDT	Severe Thunderstorm Warning	LWX	Saint Mary's	44 min
Jun 1, 4:49 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Prince George's	41 min
Jun 1, 4:51 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Harford, City of Baltimore	39 min
Jun 1, 5:22 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford	38 min
Jun 1, 5:23 PM EDT	Tornado Warning	LWX	Anne Arundel, Howard, Prince George's	37 min
Jun 1, 5:28 PM EDT	Tornado Warning	LWX	Frederick	32 min
Jun 1, 5:32 PM EDT	Flash Flood Warning	LWX	Montgomery, Prince George's	6 hr
Jun 1, 5:36 PM EDT	Flash Flood Warning	LWX	Baltimore, City of Baltimore	6 hr
Jun 1, 5:49 PM EDT	Severe Thunderstorm Warning	LWX	Allegany	41 min
Jun 1, 5:56 PM EDT	Tornado Warning	LWX	Harford	34 min
Jun 1, 5:56 PM EDT	Tornado Warning	LWX	Anne Arundel, Baltimore, Howard	23 min
Jun 1, 6:06 PM EDT	Coastal Flood Advisory	LWX	Prince George's	2 hr
Jun 1, 6:14 PM EDT	Tornado Warning	LWX	Allegany	31 min
Jun 1, 6:22 PM EDT	Tornado Warning	LWX	Harford	38 min
Jun 1, 6:29 PM EDT	Severe Thunderstorm Warning	LWX	Allegany, Washington	46 min
Jun 1, 6:35 PM EDT	Flash Flood Warning	LWX	Anne Arundel, Baltimore, Howard, Montgomery, Prince George's	5 hr
Jun 1, 6:55 PM EDT	Tornado Warning	LWX	Anne Arundel, Howard, Prince George's	35 min
Jun 1, 7:15 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Howard, City of Baltimore	26 min
Jun 1, 7:19 PM EDT	Tornado Warning	LWX	Anne Arundel, Baltimore, City of Baltimore	26 min
Jun 1, 7:20 PM EDT	Severe Thunderstorm Warning	LWX	Washington	40 min
Jun 1, 7:29 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Charles, Prince George's, Saint Mary's	31 min
Jun 1, 7:35 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Harford, City of Baltimore	40 min

Nearby

Flash Flood Warnings in Maryland, 2012 Every 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.