Alert archive / Delaware / Flash Flood Warnings in 2001

Flash Flood Warning 2, NWS Philadelphia/Mount Holly

March 21, 2001New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Mar 21, 2001, 5:46 PM EST for New Castle County, Delaware. It was in force for 2 hr. 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
Mar 21, 2001, 5:46 PM EST (22:46 UTC)
Expired
Mar 21, 2001, 8:15 PM EST
In force
2 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties; the outline is the Mesonet’s reconstruction

County New Castle County, DE

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.8 hours before the alert went out and 40 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2001-03-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2001-03-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 339 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
503 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
339 m²/s²
0-3 km storm-relative helicity
576 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 212247
FFWPHL
DEC003-220115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
546 PM EST WED MAR 21 2001

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS CONTINUED A

* FLASH FLOOD WARNING FOR...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE

* UNTIL 815 PM EST.

* AT 542 PM EST...THE CHRISTINA RIVER AT COOCHES BRIDGE WAS 10.3 
  FEET AND RISING SLOWLY. A CREST OF AROUND 10.5 FEET IS EXPECTED 
  EARLY THIS EVENING BEFORE A SLOW FALL TO BELOW FLOOD STAGE BY LATE
  EVENING.

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE
TELEVISION OUTLET.

LAT...LON 3972 7579 3940 7570 3956 7559 3983 7560

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 21, 3:43 PM ESTFlash Flood WarningPHINew Castle2 hr

Nearby

Flash Flood Warnings in Delaware, 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.