Alert archive / Maryland / Flash Flood Warnings in 2000

Flash Flood Warning 2, NWS Baltimore/Washington

May 13, 2000Baltimore County, Harford County, Maryland

NWS Baltimore/Washington issued this flash flood warning at May 13, 2000, 7:55 PM EDT for Baltimore County, Harford County, Maryland. It was in force for 110 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: May 13, 2000, 7:55 PM EDT (23:55 UTC)
Expired: May 13, 2000, 9:45 PM EDT
In force: 110 min
Issued by: NWS Baltimore/Washington
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Baltimore County, MD, Harford County, MD

The radar

The Sterling radar (KLWX), 111 km from the middle of the area, began a volume at 23:59 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.9 hours before the alert went out and 108 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: 680 J/kg
Mixed-layer CIN: -169 J/kg
Mixed-layer LCL: 1644 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: -23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS51 KLWX 132356
FFWLWX
MDC005-025-140145-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
755 PM EDT SAT MAY 13 2000

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

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

* UNTIL 945 PM EDT

* AT 749 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAIN ALONG A LINE EXTENDING FROM 20
  MILES NORTHEAST OF JARRETTSVILLE TO 4 MILES WEST OF JARRETTSVILLE
  TO COCKEYSVILLE...MOVING NORTHEAST AT 22 MPH.

* THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL BE NEAR...
  KINGSVILLE AT 804 PM EDT.
  PLEASANT HILLS AT 810 PM EDT.
  FALLSTON AT 812 PM EDT.
  JARRETTSVILLE AT 818 PM EDT.
  BEL AIR AT 822 PM EDT.

SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING. RADAR ESTIMATES INDICATE 3 INCHES OF RAINFALL IN THE PAST
3 HOURS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE
IN STERLING VIRGINIA.

.END/ HTS

LAT...LON 3987 7637 3955 7666 3930 7681 3944 7619?
          3979 7608 3993 7622

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 2:55 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Montgomery	50 min
May 13, 4:40 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford	35 min
May 13, 5:05 PM EDT	Tornado Warning	LWX	Baltimore	25 min
May 13, 5:13 PM EDT	Severe Thunderstorm Warning	LWX	Harford	47 min
May 13, 5:22 PM EDT	Tornado Warning	LWX	Harford	38 min
May 13, 5:40 PM EDT	Severe Thunderstorm Warning	LWX	Washington	65 min
May 13, 6:16 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	29 min
May 13, 6:39 PM EDT	Severe Thunderstorm Warning	LWX	Carroll	66 min
May 13, 6:42 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	33 min
May 13, 6:56 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Howard, City of Baltimore	34 min
May 13, 7:17 PM EDT	Severe Thunderstorm Warning	LWX	Charles, Prince George's	43 min
May 13, 7:35 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, City of Baltimore	40 min
May 13, 7:35 PM EDT	Severe Thunderstorm Warning	LWX	Harford	40 min

Nearby

Flash Flood Warnings in Maryland, 2000 Every flash flood warning in 2000

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.