Alert archive / Maryland / Flash Flood Warnings in 2000

Flash Flood Warning 15, NWS Baltimore/Washington

July 14, 2000Anne Arundel County, Prince George's County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jul 14, 2000, 11:23 PM EDT for Anne Arundel County, Prince George's County, Maryland. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 14, 2000, 11:23 PM EDT (03:23 UTC)
Expired: Jul 15, 2000, 12:30 AM EDT
In force: 67 min
Issued by: NWS Baltimore/Washington
Area: Whole counties

Counties Anne Arundel County, MD, Prince George's County, MD

The radar

The Sterling radar (KLWX), 68 km from the middle of the area, began a volume at 03:24 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 00:00Z, 3.4 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.

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: 1500 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1168 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KLWX 150324
FFWLWX
MDC003-033-150430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
1123 PM EDT FRI JUL 14 2000

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND
  PRINCE GEORGES COUNTY IN CENTRAL MARYLAND

* UNTIL 1230 AM EDT

* AT 1119 PM EDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN 5 MILES NORTHWEST OF BOWIE...MOVING NORTHEAST AT 30 MPH.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...
   ODENTON AT 1126 PM EDT
   FORT MEADE AT 1130 PM EDT
   SEVERN AT 1134 PM EDT
   SOUTH GATE AT 1138 PM EDT

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. 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.

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.

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. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

HTS/JLW

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this flash flood warning went out at Jul 14, 9:20 PM EDT, 2 hours 3 minutes earlier.

Area forecast discussion, Jul 14, 9:20 PM EDT, 2 hours 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
920 PM EDT FRI JUL 14 2000

SVR THREAT IS ONGOING AND WILL BE DOING THE EVE UPDATE TO ZNS WITH
APPROPRIATE ADJSTMTS AS NEEDED...HI POPS CONTD WITH POTNTL FOR
STG/SVR TSTMS FOR AT LEAST ANTHR 3-4HRS. INTL SCTD ACTVTY WITH LCLZD
VRY HVY RAINS AND ISOLD LRG HAIL APPRS TO BE ON THE WANE AND
EMPHASIS AND ATTN NOW TURNG TO BETTER DYNAMICALLY DRIVEN LN OF TSTMS
APCHG AND ASSOCD WITH DPNG LRG SCALE TROF...THREAT SHIFTG FM ONLY
HVY RAIN/HAIL TO MORE WNDS. 00Z IAD RAOB SHOWS GUD DIRECTNL SHEAR
AND MDT INSTBLTY BUT NOT A LOT OF SPEED SHEAR.

.LWX...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.

JLWq

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 8:15 PM EDT	Severe Thunderstorm Warning	LWX	Washington	45 min
Jul 14, 10:06 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	24 min
Jul 14, 10:44 PM EDT	Flash Flood Warning	LWX	Baltimore, City of Baltimore	2 hr
Jul 15, 12:11 AM EDT	Severe Thunderstorm Warning	LWX	Charles	64 min
Jul 15, 12:35 AM EDT	Flash Flood Warning	LWX	Charles, Saint Mary's	115 min
Jul 15, 2:25 AM EDT	Flash Flood Warning	LWX	Saint Mary's	65 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.