Ohio, 2001

Flash Flood in Ohio, July 20, 2001

July 20, 2001 · NWS ILN · 1 event in 1 county or zone

1 flash flood, as filed by the National Weather Service.

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Wilmington, OH wrote its last area forecast discussion before the first event at Jul 20, 2:21 PM EST, 2 hours 29 minutes earlier.

Area forecast discussion, Jul 20, 2:21 PM EST, 2 hours 29 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
321 PM EDT FRI JUL 20 2001

PERSISTENT UPPER AIR PATTERN SHOWS TROF OFF THE EAST COAST AND RIDGE
AXIS OVER THE PLAINS.  WITH UPPER RIDGE AXIS REMAINING TO OUR
WEST...WEAK NORTHERLY FLOW ALOFT WILL CONTINUE ACROSS THE OHIO
VALLEY THROUGH THE WEEKEND.

AT THE SFC...WEAK BOUNDARY NEAR THE OHIO RIVER REMAINS BETWEEN HIGH
OVER NEW YORK AND BROAD DIFFUSE LOW OVER THE HIGH PLAINS.  70+ DEW
POINTS ARE EVIDENT FROM OUR PART OF THE OHIO VALLEY WEST TO THE
MISSISSIPPI VALLEY.  THIS SOUPY AIRMASS WILL STAY SITUATED ACROSS
OUR AREA THROUGH THE FCST PERIOD.

RADAR SHOWS WDLY SCT SHRA/TSRA AROUND OUR CWA.  WITH MODELS SHOWING
LIMITED UPPER SUPPORT TONIGHT...ILL GO WITH 30 POPS FOR THIS
EVENING ALL ZONES AS COVERAGE SHOULD REMAIN SCT WITH LACK OF STRONG
FORCING.

WITH UNSTABLE AIR REMAINING IN PLACE AND MODELS INDICATING MORE PVA
ROUNDING THE UPPER RIDGE...ILL CARRY 30 POPS FOR AFTERNOON TSRA
SATURDAY AND SUNDAY.  ILL ALSO CARRY 30 POPS SATURDAY NIGHT FOR
ACTIVITY THAT MAY LINGER INTO EVENING.

SLOW MOVING UPPER FLOW AND PWAT AROUND 1.7 GIVE HEAVY RAIN
POTENTIAL TO ANY STORMS THAT DEVELOP...THOUGH FFG VALUES HAVE
REBOUNDED CONSIDERABLY SINCE THE HEAVY RAIN OF A COUPLE DAYS AGO.

WITH SODDEN AIRMASS HANGING AROUND...ILL KEEP MENTION OF FOG FOR
TONIGHT.

WITH A SLIGHT WARMING TREND OCCURRING IN OUR STAGNANT AIRMASS...FWC
TEMPS LOOK A BIT LOW SO ILL GENERALLY GO A DEGREE OR TWO ABOVE.

.ILN...NONE.

CONIGLIO

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Hamilton

When
July 20, 4:50 PM EST to 6:00 PM EST
Where
Hamilton County, Greenhills
Reported by
LAW ENFORCEMENT
Coordinates
39.196, -84.543 (the zone’s center; the record gives no point)

Thunderstorms produced heavy rain which closed two roads and flooded two basements.

What these are

Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Ohio in 2001Every state in 2001This day in weather historyWarnings in Ohio, July 2001

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5257029.