Alert archive / Illinois / Flash Flood Warnings in 1990

Flash Flood Warning 42, NWS Lincoln, IL

August 19, 1990Boone County, DeKalb County, Winnebago County, Illinois

NWS Lincoln, IL issued this flash flood warning at Aug 19, 1990, 4:32 AM CDT for Boone County, DeKalb County, Winnebago County, Illinois. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: Aug 19, 1990, 4:32 AM CDT (09:32 UTC)
Expired: Aug 19, 1990, 5:30 AM CDT
In force: 58 min
Issued by: NWS Lincoln, IL
Area: Whole counties

Counties Boone County, IL, DeKalb County, IL, Winnebago County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 9.5 hours before the alert went out and 264 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 552 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRFD 190932
FFWRFD
ILC201-007-037-191030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING 
NATIONAL WEATHER SERVICE ROCKFORD IL
432 AM CDT SUN AUG 19 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 530 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE NORTH CENTRAL PART OF ILLINOIS
      SOUTHERN WINNEBAGO...SOUTHERN BOONE...NORTHERN DEKALB

A THUNDERSTORM WITH VERY HEAVY DOWNPOURS WAS MOVING VERY SLOWLY
ACROSS SOUTHERN WINNEBAGO COUNTY AT 430 CDT THIS MORNING. THIS
STORM WILL CONTINUE MOVING EAST VERY SLOW INTO PARTS OF SOUTHERN
BOONE AND NORTHERN DEKALB COUNTY FOR ABOUT ANOTHER HOUR.

SOME COMMUNITIES THAT ARE IN OR NEAR THE FLASH FLOOD AREA...
THE SOUTH SIDE OF ROCKFORD...BELVIDERE...AND GENOA.

THIS FLOOD WARNING MEANS THAT FLOODING IS AN IMMEDIATED THREAT!
PERSONS IN LOW LYING OR FLOOD PRONE AREAS MOVE TO HIGHER GROUND..
IF YOU ARE IN AREAS WHERE YOU ARE NOT FAMILIAR... BE EXTREMELY
CAUTIOUS AND CONSIDER HEADING FOR HIGHER GROUND.  IF CAMPING OR
IN A CAR WATCH FOR RAPIDLY RISING WATER THAT MAY ENDANGER YOUR
CAMPSITE OR CUT OFF ESCAPE ROUTES.  DO NOT CROSS ROADS COVERED
BY WATER... THE ROAD MAY BE WASHED OUT OR THE WATER MUCH DEEPER
THAN YOU THINK!  REMEMBER THESE FLOODS HAPPEN RAPIDLY... BE ALERT!

ATTN: ISP DIST [1..2..16                                FIELDS

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 2:01 AM CDT	Flash Flood Warning	ILX	Boone, Winnebago	2 hr
Aug 19, 2:01 AM CDT	Flash Flood Warning	ILX	Stephenson	2 hr
Aug 19, 5:09 PM CDT	Tornado Warning	ILX	Stephenson, Winnebago	36 min
Aug 19, 5:35 PM CDT	Tornado Warning	ILX	Boone, Winnebago	40 min
Aug 19, 6:13 PM CDT	Flash Flood Warning	ILX	Boone, DeKalb, Lee, Ogle, Winnebago	2 hr
Aug 19, 6:13 PM CDT	Flash Flood Warning	ILX	Carroll, Stephenson	2 hr

Nearby

Flash Flood Warnings in Illinois, 1990 Every flash flood warning in 1990

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.