Alert archive / Maryland / Flash Flood Warnings in 2000

Flash Flood Warning 36, NWS Baltimore/Washington

September 11, 2000Allegany County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Sep 11, 2000, 7:16 PM EDT for Allegany County, Maryland. It was in force for 119 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: Sep 11, 2000, 7:16 PM EDT (23:16 UTC)
Expired: Sep 11, 2000, 9:15 PM EDT
In force: 119 min
Issued by: NWS Baltimore/Washington
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Allegany County, MD

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 11.3 hours before the alert went out and 135 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: 84 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KLWX 112318
FFWLWX
MDC001-120115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
716 PM EDT MON SEP 11 2000

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN ALLEGANY COUNTY IN WESTERN MARYLAND

* UNTIL 915 PM EDT

* AT 705 PM EDT...WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL OVER LA VALE.  THE AREA
  OF HEAVY RAIN WAS NEARLY STATIONARY.

EMEREGENCY MANAGEMENTS REPORTED STREAMS OUT OF THEIR BANKS OVER
THE WESTERN PORTION OF ALLEGANY COUNTY. ADDITIONAL THUNDERSTORMS
WITH HEAVY RAIN WILL RESULT IN ADDITIONAL FLOODING.

IF WATER IS FLOWING ACROSS A ROADWAY TURN YOUR VEHICLE AROUND AND
FIND AN ALTERNATE ROUTE. 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
OFFILCE IN STERLING VIRGINIA.

LAT...LON 3968 7897 3949 7905 3947 7895 3961 7881
          3968 7872 3973 7882


DMW

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 Sep 11, 2:34 PM EDT, 4 hours 42 minutes earlier.

Area forecast discussion, Sep 11, 2:34 PM EDT, 4 hours 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
234 PM EDT MON SEP 11 2000

MDLS IN GOOD AGREEMENT AS TO TIMING OF THE CD FNT - TO APRCH ARND
MIDNGT TUE NGT. IN SHORT TERM HAVE 30 POPS ACROSS THE W TNGT WHERE
RDR HAS BEEN SHOWING ECHOES ALL DAY...AND WL CONTINUE THIS TREND
DURG TUE. TUE NGT FNT RCHS APLCHNS ARND MIDNGT AND HAVE CHC POPS
ACRS THE AREA...CONTINUING INTO WED MRNG B4 ENDING.

THURS LOOKS TO BE PRETTY NICE B4 UPR LO CLOSES TO THE N OF THE FA.
HAVE CHC POPS FOR FRI. NOT SURE THIS PATTERN WL BRING RAIN ON SAT SO
WL LV OUT FOR NOW.

DCA   64  81  70  84 /  20  20  40  30
BWI   64  81  70  84 /  20  20  40  30
MRB   68  79  65  83 /  30 - 30  50  30
IAD   69  81  67  84 /  20  20  40  30
CHO   68  79  68  83 /  20  20  40  30
HGR   68  79  65  83 /  30  30  50  30
NHK   66  82  70  84 /  20  20  40  30

.LWX...NONE.

WOODY!

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.