Alert archive / Maryland / Flash Flood Warnings in 2000
Flash Flood Warning 22, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jul 31, 2000, 4:42 PM EDT for Allegany County, Maryland. It was in force for 78 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
- Jul 31, 2000, 4:42 PM EDT (20:42 UTC)
- Expired
- Jul 31, 2000, 6:00 PM EDT
- In force
- 78 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Allegany County, MD
The radar
The Sterling radar (KLWX), 142 km from the middle of the area, began a volume at 20:42 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
Pittsburgh, PA (KPIT), launched 12:00Z, 8.7 hours before the alert went out and 134 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
- 618 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KLWX 312046 FFWLWX MDC001-312200- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 442 PM EDT MON JUL 31 2000 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * FLASH FLOOD WARNING FOR... WESTERN AND CENTRAL ALLEGANY COUNTY IN WESTERN MARYLAND * UNTIL 600 PM EDT * AT 436 PM EDT...WEATHER SPOTTERS REPORTED THAT GEORGES CREEK IN WESTERNPORT TO BE OUT OF ITS BANKS. DOPPTER RADAR SHOWED ADDITIONAL THUNDERSTORMS WITH HEAVY RAIN MOVING INTO THE AREA OF WESTERN ALLEGANY COUNTY...THE THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MPH. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING. 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. LAT...LON 3950 7918 3945 7901 3973 7847 3993 7871 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 31, 3:20 PM EDT, 1 hour 22 minutes earlier.
Area forecast discussion, Jul 31, 3:20 PM EDT, 1 hour 22 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 320 PM EDT MON JUL 31 2000 FLORIDA WEATHER HAS COME TO THE MID ATL STATES WITH TMPS IN THE 80S AND DWPTS IN THE 70S...AND IT/S NOT LEAVING SOON. PERSISTENCE FORECAST WILL WORK OUT JUST FINE FOR THIS PACKAGE. SLW MOVNG SCATTERED SHWRS AND TSTMS WITH HEAVY RAIN WILL BE AROUND THROUGH THE WEEK. TROPICAL PLUME EVIDENCED ON THE WV LOOP INDICATES DEEP MOISTURE AND PW VALS ARE BTWN 1.5 AND TWO INCHES. NOT MUCH IN THE WAY OF FORCING...BUT RIDGE LINES AND WEAK IMPULSES WILL BE ENUF FOR RNDM CONVCTN...MAINLY DURING THE AFTERNOON AND EVENING HOURS. EXTNDED PROGS HAVE A DRIER CANADIAN HGH PRES AREA MOVING IN LATE SAT. MRF MOS GUIDANCE SHWS REMARKABLE DAY TO DAY CONSISTENCY THRU THE WEEK. STRONG FCSTID = 78 DCA 70 85 70 87 / 40 40 40 40 BWI 70 85 70 87 / 40 40 40 40 MRB 70 85 70 87 / 40 40 40 40 IAD 70 85 70 87 / 40 40 40 40 CHO 70 85 70 87 / 40 40 40 40 HGR 70 85 70 87 / 40 40 40 40 NHK 70 85 70 87 / 40 40 40 40 .LWX... DC...NONE. MD...NONE. VA...NONE. WV...NONE.
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 4:51 PM EDT | Tornado Warning | LWX | Saint Mary's | 39 min |
| Jul 31, 5:08 PM EDT | Tornado Warning | LWX | Calvert | 52 min |
Nearby
Flash Flood Warnings in Maryland, 2000Every 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.