Alert archive / Illinois / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 404

June 1, 200031 counties in Illinois; Des Moines County, Lee County, Iowa; Clark County, Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Jun 1, 2000, 8:00 PM CDT for 31 counties in Illinois; Des Moines County, Lee County, Iowa; Clark County, Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 1, 2000, 8:00 PM CDT (01:00 UTC)
Expired: Jun 2, 2000, 1:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 34 counties

Des Moines County, IA, Lee County, IA, Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Clark County, MO

The radar

The Quad Cities radar (KDVN), 76 km from the middle of the area, began a volume at 00:59 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.

Warnings issued inside it

1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 1, 8:10 PM CDT	Severe Thunderstorm Warning	LOT	Ogle	65 min

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.0 hours before the alert went out and 71 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: 1531 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1547 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 7.2

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 020047
SEL4  

MKC WW 020042
IAZ000-ILZ000-MOZ000-LMZ000-020600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 404
STORM PREDICTION CENTER NORMAN OK
742 PM CDT THU JUN 1 2000

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHEAST IOWA                               
   NORTHERN ILLINOIS                           
   SMALL PART OF NORTHEAST MISSOURI                           
   LAKE MICHIGAN                      

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 800 PM UNTIL
100 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES SOUTH SOUTHEAST OF BURLINGTON
IOWA TO 45 MILES NORTH OF MEIGS FIELD CHICAGO ILLINOIS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 402.  WATCH NUMBER 402 WILL NOT BE
IN EFFECT AFTER 800 PM CDT.  CONTINUE...WW 400...WW 401...WW 403...

DISCUSSION...LINE STRONG/SEVERE THUNDERSTORMS CONTINUES DEVELOPING
EWD AHEAD OF COLD FRONT.  WITH 00Z SOUNDINGS INDICATING MODERATE
INSTABILITY AND SHEAR PROFILES AT DVN AND ILX...STORMS WILL
POTENTIALLY BE SEVERE FOR SEVERAL MORE HOURS AS THEY TRACK ACROSS
NRN IL.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 26030.


...HALES

;423,0860 401,0892 401,0921 423,0890;


A

Nearby

Severe Thunderstorm Watches in Illinois, 2000 Severe Thunderstorm Watches in Iowa, 2000 Severe Thunderstorm Watches in Missouri, 2000 Every severe thunderstorm watch 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; radar from the NEXRAD Level II archive.