Alert archive / Illinois / Flash Flood Warnings in 1997

Flash Flood Warning 2, NWS Lincoln, IL

June 20, 1997Logan County, Mason County, Illinois

NWS Lincoln, IL issued this flash flood warning at Jun 20, 1997, 11:25 AM CDT for Logan County, Mason County, Illinois. 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 counties it named.

The facts

Issued
Jun 20, 1997, 11:25 AM CDT (16:25 UTC)
Expired
Jun 20, 1997, 1:30 PM CDT
In force
2 hr
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Logan County, IL, Mason County, IL

The radar

The Lincoln radar (KILX), 26 km from the middle of the area, began a volume at 16:28 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

Lincoln, IL (KILX), launched 12:00Z, 4.4 hours before the alert went out and 89 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, Lincoln, IL at 12:00Z on 1997-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1020 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, Lincoln, IL at 12:00Z on 1997-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.193958Sfc1 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
1020 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
16 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 201627
FFWSPI
ILC107-125-201830-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1125 AM CDT FRI JUN 20 1997

* FLASH FLOOD WARNING FOR
  NORTHERN LOGAN COUNTY - IN CENTRAL ILLINOIS
  EASTERN MASON COUNTY - IN CENTRAL ILLINOIS

* UNTIL 130 PM CDT
 
* SOME AREAS AFFECTED
  RURAL AREAS NORTH AND NORTHEAST OF MASON CITY
  SAN JOSE
  HARTSBURG
  EMDEN

* CAUSE AND EFFECT
  THUNDERSTORMS WITH VERY HEAVY RAIN HAVE PRODUCED 2 TO 3 INCHES OF
  RAINFALL SINCE 1030 AM IN EASTERN MASON AND EXTREME NORTHWEST LOGAN
  COUNTIES.

* FORECAST CONDITIONS
  ADDITIONAL THUNDERSTORMS ARE EXPECTED TO CONTINUE MOVING ACROSS THE
  WARNED AREA INTO EARLY AFTERNOON WITH MORE HEAVY RAIN.

MOVE TO HIGHER GROUND IMMEDIATELY IF FLOODWATERS THREATEN AND AVOID
DRIVING ACROSS FLOODED ROADS.

BRITT

Nearby

Flash Flood Warnings in Illinois, 1997Every flash flood warning in 1997

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.