Alert archive / Delaware / Flash Flood Warnings in 2000

Flash Flood Warning 18, NWS Philadelphia/Mount Holly

July 15, 2000Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 15, 2000, 12:05 AM EDT for Sussex County, Delaware. It was in force for 3 hr. 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, 12:05 AM EDT (04:05 UTC)
Expired
Jul 15, 2000, 3:00 AM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Sussex County, DE

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.1 hours before the alert went out and 84 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, Wallops Is Stn, VA at 00:00Z on 2000-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 692 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 00:00Z on 2000-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 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
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 KPHI 150406
FFWPHI
DEC005-150700-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1205 AM EDT SAT JUL 15 2000

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SUSSEX COUNTY IN SOUTHERN DELAWARE

* UNTIL 300 AM EDT.

* AT 1155 PM EDT...WEATHER SERVICE RADAR INDICATED AN INTENSIFYING
THUNDERSTORM OVER WICOMOCO COUNTY IN MARYLAND.  THE STORM WILL BE
ACCOMPANIED BY HEAVY DOWNPOURS AS IT MOVES NORTHEAST AROUND 10 MPH.
THE THUNDERSTORM WILL LIKELY AFFECT MUCH OF SUSSEX COUNTY...
INCLUDING THE NORTHEAST PART WHICH RECEIVED HEAVY RAINFALL...
POSSIBLY IN EXCESS OF SIX INCHES...THIS EVENING.

* SOME LOCATIONS AFFECTED INCLUDE...
  SEAFORD...
  MILTON...
  MILFORD...
  LAUREL...
  GEORGETOWN...

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.

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO.
$$

IOVINO/NATIONAL WEATHER SERVICE;

LAT...LON 3891 7531 3876 7510 3850 7508 3850 7567
          3879 7567

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 1:10 AM EDTSevere Thunderstorm WarningPHISussex35 min
Jul 15, 1:43 AM EDTSevere Thunderstorm WarningPHISussex47 min

Nearby

Flash Flood Warnings in Delaware, 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.