Alert archive / Maryland / Flash Flood Warnings in 2018
Flash Flood Warning 21, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at May 27, 2018, 5:51 PM EDT for Anne Arundel County, Howard County, Maryland. It was in force for 7 hr. 2 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 27, 2018, 5:51 PM EDT (21:51 UTC)
- Expired
- May 28, 2018, 12:45 AM EDT
- In force
- 7 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
Counties Anne Arundel County, MD, Howard County, MD
The radar
The Sterling radar (KLWX), 65 km from the middle of the area, began a volume at 21:53 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 27, 6:56 PM EDT | FLASH FLOOD | 2 Wsw Elkridge, MD | DEEP RUN CREEK OVERFLOWING MAYFIELD AVE IN SOUTHEAST ELKRIDGE. |
| May 27, 7:05 PM EDT | FLASH FLOOD | Columbia, MD | FLOODING BEGAN OF SOUTH ENTRANCE ROAD IN COLUMBIA AFTER THE LITTLE PATUXENT RIVER RAPIDLY CAME OUT OF ITS BANKS. SHORTLY THEREAFTER, THE STREAM COVERED THE SOUTHBOUND LANES OF US 29, WITH A WATER RESCUE REQUIRED. |
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, 9.9 hours before the alert went out and 60 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
- 51 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 925 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
The text
As transmitted.
671
WGUS51 KLWX 272151
FFWLWX
MDC003-027-280145-
/O.NEW.KLWX.FF.W.0021.180527T2151Z-180528T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
551 PM EDT SUN MAY 27 2018
The National Weather Service in Sterling Virginia has issued a
* Flash Flood Warning for...
Northwestern Anne Arundel County in central Maryland...
Southeastern Howard County in central Maryland...
* Until 945 PM EDT.
* At 551 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the area. Up to two inches of rain have already
fallen. Flash flooding is expected to begin shortly.
* Some locations that may experience flooding include...
Columbia, Severn, Elkridge, Ellicott City, Savage-guilford,
Scaggsville, Ilchester, Linthicum, Jessup, Savage, Fulton,
Highland, Hanover, Simpsonville, Clarksville and Harmans.
This includes flood prone locations
Avoca Avenue at Red Hill Branch...
Dorsey Run Road at Patuxent Range...
Old Columbia Road at Middle Patuxent River...
South Entrance Road and Route 29...
Owen Brown Road near Cardinal Lane...
Trotter Road near Route 108...
Guilford Road near Spring Lake Drive...
Pindell School Road at Middle Patuxent River...
Route 1 at Pine Avenue...
Meadowridge Road at Route 1...
Race Road along Deep Run...
Sanner Road at Middle Patuxent River...
Woodland Road at Old Annapolis Road...
Diamondback Drive at Route 29...
Folly Quarter Road at The Middle Patxuent River...
and Harriet Tubman Lane near Middle Patuxent River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 3920 7668 3913 7668 3917 7698 3929 7691
3927 7688 3925 7687 3924 7676 3922 7675
$$
JE3 follow-up statements
780
WGUS71 KLWX 280001
FFSLWX
Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
801 PM EDT SUN MAY 27 2018
MDC003-027-280145-
/O.CON.KLWX.FF.W.0021.000000T0000Z-180528T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Anne Arundel MD-Howard MD-
801 PM EDT SUN MAY 27 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM EDT FOR
NORTHWESTERN ANNE ARUNDEL AND SOUTHEASTERN HOWARD COUNTIES...
At 800 PM EDT, Doppler radar indicated one to three inches of rain
fell earlier across the area, with heavier rain upstream.
Significant flash flooding is ongoing, especially along the Little
Patuxent River, where the stream is several feet above flood stage
and deep water is covering the southbound lanes of US 29 with water
rescues ongoing.
Some locations that will experience flooding include...
Columbia, Severn, Elkridge, Ellicott City, Savage-guilford,
Scaggsville, Ilchester, Linthicum, Jessup, Savage, Fulton, Highland,
Hanover, Simpsonville, Clarksville and Harmans.
This includes the following streams and drainages...Middle Patuxent
River...Patapsco River...Midway Branch...Piny Run...Dorsey Run...
Severn River...Patuxent River...Little Patuxent River...Stony Run...
Red Hill Branch...Deep Run...Sawmill Creek and Severn Run.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 3920 7668 3913 7668 3917 7698 3929 7691
3927 7688 3925 7687 3924 7676 3922 7675
$$
JE847
WGUS51 KLWX 280127
FFWLWX
MDC003-027-280445-
/O.EXT.KLWX.FF.W.0021.000000T0000Z-180528T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
927 PM EDT SUN MAY 27 2018
The National Weather Service in Sterling Virginia has extended the
* Flash Flood Warning for...
Northwestern Anne Arundel County in central Maryland...
Southeastern Howard County in central Maryland...
* Until 1245 AM EDT.
* At 926 PM EDT, stream gauges indicated flash flooding, especially
along the Little Patuxent River from Columbia downstream. Water
levels are still rising, with the stream in Columbia currently
more than five feet above flood stage. Flash flooding is already
occurring, and other areas are likely to have streams out of their
banks as well from earlier rainfall.
* Some locations that may experience flooding include...
Columbia, Severn, Elkridge, Ellicott City, Savage-guilford,
Scaggsville, Ilchester, Linthicum, Jessup, Savage, Fulton,
Highland, Hanover, Simpsonville, Clarksville and Harmans.
This includes the following streams and drainages...Middle Patuxent
River...Patapsco River...Midway Branch...Piny Run...Dorsey Run...
Severn River...Patuxent River...Little Patuxent River...Stony Run...
Red Hill Branch...Deep Run...Sawmill Creek and Severn Run.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 3920 7668 3913 7668 3917 7698 3929 7691
3927 7688 3925 7687 3924 7676 3922 7675
$$
JE999
WGUS71 KLWX 280441
FFSLWX
Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
1241 AM EDT MON MAY 28 2018
MDC003-027-280449-
/O.EXP.KLWX.FF.W.0021.000000T0000Z-180528T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Anne Arundel MD-Howard MD-
1241 AM EDT MON MAY 28 2018
...THE FLASH FLOOD WARNING FOR NORTHWESTERN ANNE ARUNDEL AND
SOUTHEASTERN HOWARD COUNTIES WILL EXPIRE AT 1245 AM EDT...
The crest of floodwaters has reached the Little Patuxent River at
Savage. Thus, the threat of rapid life-threatening flooding has
ended. Significant flooding continues in this area though, and a
flood warning remains in effect.
LAT...LON 3920 7668 3913 7668 3917 7698 3929 7691
3927 7688 3925 7687 3924 7676 3922 7675
$$
ADSThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 4:25 AM EDT | Flash Flood Watch | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more | 16 hr |
| May 27, 1:28 PM EDT | Areal Flood Warning | LWX | Baltimore, City of Baltimore | 7 hr |
| May 27, 1:52 PM EDT | Areal Flood Warning | LWX | Baltimore, Harford | 7 hr |
| May 27, 2:01 PM EDT | Flash Flood Warning | LWX | Baltimore, City of Baltimore | 3 hr |
| May 27, 3:10 PM EDT | Areal Flood Warning | LWX | Baltimore | 6 hr |
| May 27, 3:19 PM EDT | Areal Flood Warning | LWX | Baltimore, Howard, City of Baltimore | 3 hr |
| May 27, 3:37 PM EDT | Tornado Warning | LWX | Baltimore, Carroll | 11 min |
| May 27, 4:09 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 51 min |
| May 27, 4:23 PM EDT | Areal Flood Warning | LWX | Anne Arundel, Howard | 24 hr |
| May 27, 4:26 PM EDT | Flash Flood Warning | LWX | Baltimore, Howard | 6 hr |
| May 27, 4:32 PM EDT | Areal Flood Warning | LWX | Allegany | 4 hr |
| May 27, 4:48 PM EDT | Areal Flood Warning | LWX | Baltimore, Carroll, Frederick, Howard | 6 hr |
| May 27, 4:50 PM EDT | Flash Flood Warning | LWX | Baltimore, City of Baltimore | 5 hr |
| May 27, 5:06 PM EDT | Flash Flood Warning | LWX | Anne Arundel, Baltimore, Howard | 5 hr |
| May 27, 5:47 PM EDT | Flash Flood Warning | LWX | Baltimore, Carroll, Frederick, Howard, City of Baltimore | 4 hr |
| May 27, 6:31 PM EDT | Flash Flood Warning | LWX | Howard | 4 hr |
| May 27, 7:28 PM EDT | Areal Flood Warning | LWX | Calvert | 10 hr |
Nearby
Flash Flood Warnings in Maryland, 2018Every flash flood warning in 2018
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.