Alert archive / Maryland / Flash Flood Warnings in 2000

Flash Flood Warning 17, NWS Baltimore/Washington

July 15, 2000Saint Mary's County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jul 15, 2000, 2:25 AM EDT for Saint Mary's County, Maryland. It was in force for 65 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 15, 2000, 2:25 AM EDT (06:25 UTC)
Expired: Jul 15, 2000, 3:30 AM EDT
In force: 65 min
Issued by: NWS Baltimore/Washington
Area: Whole counties

County Saint Mary's County, MD

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 6.4 hours before the alert went out and 104 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: 692 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KLWX 150628
FFWLWX
MDC037-150730-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
225 AM EDT SAT JUL 15 2000

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. MARYS COUNTY IN SOUTHERN MARYLAND

* UNTIL 330 AM EDT

* AT 230 AM EDT...WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH TORRENTIAL RAINS CONTINUING ACROSS ST MARYS
COUNTY WITH THE AREA MOVING TOWARD THE EAST AT 20 MPH. RAINFALL
RATES OF 2-3 INCHES HAS BEEN REPORTED WITH THESE STORMS.

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.

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

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, 5 hours 5 minutes earlier.

Area forecast discussion, Jul 14, 9:20 PM EDT, 5 hours 5 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 14, 11:23 PM EDT	Flash Flood Warning	LWX	Anne Arundel, Prince George's	67 min
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

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.