Alert archive / Illinois / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 739

September 14, 200021 counties in Illinois; 17 counties in Iowa; 16 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Sep 14, 2000, 3:15 AM CDT for 21 counties in Illinois; 17 counties in Iowa; 16 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Sep 14, 2000, 3:15 AM CDT (08:15 UTC)
Expired: Sep 14, 2000, 8:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 54 counties

Appanoose County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Monroe County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Warren County, IL, Whiteside County, IL, Adair County, MO, Clark County, MO, Daviess County, MO, Grundy County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

The radar

The Quad Cities radar (KDVN), 165 km from the middle of the area, began a volume at 08:18 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

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

Issued	Product	Office	Counties	Lasted
Sep 14, 4:06 AM CDT	Severe Thunderstorm Warning	EAX	Sullivan	39 min
Sep 14, 5:04 AM CDT	Severe Thunderstorm Warning	EAX	Linn	41 min

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 8.3 hours before the alert went out and 171 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: 2544 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

164 
WWUS9 KMKC 140813
SEL9  

SEL9  
MKC WW 140804
IAZ000-ILZ000-MOZ000-141300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 739
STORM PREDICTION CENTER NORMAN OK
304 AM CDT THU SEP 14 2000

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

   SOUTHEAST IOWA                               
   WESTERN AND NORTHERN ILLINOIS                           
   NORTHERN AND EASTERN MISSOURI                           

EFFECTIVE THIS THURSDAY MORNING FROM 315 AM UNTIL 800 AM CDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 105 STATUTE MILES
EAST AND WEST OF A LINE FROM 25 MILES SOUTH OF KIRKSVILLE MISSOURI
TO 30 MILES NORTHEAST OF MOLINE 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...  CONTINUE...WW 738...

DISCUSSION...THREAT FOR DAMAGING WINDS APPEARS TO BE INCREASING 
WITH DEVELOPING MCS NOW OVER SRN AND ERN IA...PER STRENGTHENING LOW
LEVEL WIND FIELD ON DSM VWP AND WELL-DEFINED RISE/FALL COUPLET IN
SURFACE PRESSURE FIELD.  40-50 KT 850 MB WLY FLOW ACROSS SRN IA/NRN
MO SUGGEST THAT WATCH AREA WILL EXPERIENCE CONTINUED DESTABLIZATION
JUST ABOVE THE SURFACE DURING THE NEXT SEVERAL HOURS.  THIS SHOULD
RESULT IN FURTHER STORM DEVELOPMENT AND POSSIBLE EMBEDDED SMALL
SCALE BOWS. 

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 30035.

...CORFIDI

414,0880 394,0903 394,0943 414,0920

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 13, 7:45 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 41 more	5 hr
Sep 14, 12:15 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 17 more	5 hr

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.