Alert archive / Maryland / Flash Flood Warnings in 2001
Flash Flood Warning 50, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Aug 30, 2001, 7:03 PM EDT for Howard County, Maryland. It was in force for 117 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
- Aug 30, 2001, 7:03 PM EDT (23:03 UTC)
- Expired
- Aug 30, 2001, 9:00 PM EDT
- In force
- 117 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Howard County, MD
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.1 hours before the alert went out and 62 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
- 1915 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 517 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KLWX 302305 FFWLWX MDC027-310100- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 703 PM EDT THU AUG 30 2001 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * FLASH FLOOD WARNING FOR... HOWARD COUNTY IN CENTRAL MARYLAND * UNTIL 900 PM EDT * AT 700 PM EDT...A RAIN GAUGE IN ELKRIDGE HAS RECORDED OVER TWO AND THREE QUARTER INCHES OF RAIN IN THE LAST HOUR AND FIFTEEN MINUTES. * AT 700 PM EDT...EMERGENCY MANAGERS REPORT FLASH FLOODING IN ELKRIDGE. 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. LAT...LON 3927 7686 3917 7673 3925 7674 3928 7678 ABW
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 Aug 30, 10:15 AM EDT, 8 hours 48 minutes earlier.
Area forecast discussion, Aug 30, 10:15 AM EDT, 8 hours 48 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 1015 AM EDT THU AUG 30 2001 WEAK HI PRES ACRS THE AREA ATTM ALONG WITH A WEAK FRNTL BNDRY XTNDG FM NEAR FDK TO BTWN IAD AND DCA THEN E OF EZF. SCT SHWRS AND A FEW TSTMS HAVE BEEN ACTIVE AHEAD OF THE BNDRY. SAT IMAGERY DEPICTS GNRL CLDINS E OF THE BLUE RDG WITH PATCHES OF DENSE FOG RMNG TO THE WEST OF THE RDG WHICH WL DISSIPATE BY ARND NOON. OTW ERLR FCST PKG APPEARS ON TARGET FOR THE RMNDR OF THE DAY. SLT OR 30 POP CHC WL DO FOR ANY CONV ACTVTY WHICH WL BE DIURNALLY DRIVEN WITH LTL OR NO UPR SUPPORT. FOG AND CONV BEING HANDLED WITH NOWS. THATS IT FOR NOW...LATER. FCSTID = 13...PAP DCA 86 72 86 69 / 20 10 30 50 BWI 86 69 86 67 / 20 10 30 50 MRB 85 67 85 65 / 20 10 30 60 IAD 86 67 86 65 / 20 10 30 50 CHO 85 68 85 67 / 30 20 40 50 HGR 85 66 85 64 / 20 10 30 60 NHK 86 69 86 67 / 20 10 30 50 W99 86 68 86 66 / 20 10 30 60 .LWX... DC...NONE. MD...NONE. VA...NONE. WV...NONE.
In the hours before
Special weather statement, Aug 30, 4:50 PM EDT, 2 hours 13 minutes before
DCZ001-MDZ002>006-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-302345- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 450 PM EDT THU AUG 30 2001 ...THUNDERSTORMS WITH HAIL AND TORRENTIAL RAINS AFFECTING THE AREA... SHOWERS AND THUNDERSTORMS...SOME WITH HAIL AND HEAVY RAINS WERE AFFECTING A LARGE PORTION OF NORTHERN AND CENTRAL VIRGINIA...EASTERN WEST VIRGINIA...AND CENTRAL AND SOUTHERN MARYLAND THIS AFTERNOON. THUNDERSTORMS WERE MOST NUMEROUS OVER CENTRAL AND NORTHERN VIRGINIA ESPECIALLY OVER THE SHENANDOAH VALLEY AND THE PIEDMONT AREAS. PARTS OF ROCKINGHAM ALBEMARLE AND ORANGE COUNTIES WERE ESPECIALLY HARD HIT. SEVERE THUNDERSTORM WARNINGS HAD BEEN ISSUED FOR THESE AREAS LATE THIS AFTERNOON. HAIL TO DIME SIZE OR LARGER WAS REPORTED IN CHARLOTTESVILLE JUST AFTER 4 PM. SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT MUCH OF THE AREA INTO EARLY THIS EVENING...THEN GRADUALY WEAKEN AFTER NIGHTFALL. THE STRONGER THUNDERSTORMS MAY BE ACCOMPANIED BY HAIL AND STRONG GUSTY WINDS. TORRENTIAL RAINS WITH 1 TO 2 INCHES POSSIBLE IN A SHORT PERIOD MAY RESULT IN LOCALIZED FLOODING. RESIDENTS SHOULD SEEK INDOOR SHELTER AND MOTORISTS SHOULD NOT ATTEMPT TO DRIVE INTO WATER ON ROADS. THE THUNDERSTORMS WERE THE RESULT OF A MOIST AND UNSTABLE AIR MASS OVER THE AREA AND TRIGGERED PRIMARILY BY DAYTIME HEATING. THUS A GRADUAL WEAKENING TREND IS EXPECTED AFTER DARK. JLW
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 1:31 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 29 min |
| Aug 30, 1:38 PM EDT | Flash Flood Warning | LWX | Anne Arundel | 2 hr |
| Aug 30, 5:57 PM EDT | Flash Flood Warning | LWX | Anne Arundel | 2 hr |
| Aug 30, 7:46 PM EDT | Flash Flood Warning | LWX | Charles | 119 min |
Nearby
Flash Flood Warnings in Maryland, 2001Every flash flood warning in 2001
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.