Alert archive / Illinois / Flash Flood Warnings in 2022

Flash Flood Warning 48, NWS Lincoln, IL

August 29, 2022Clark County, Edgar County, Illinois

NWS Lincoln, IL issued this flash flood warning at Aug 29, 2022, 10:22 PM CDT for Clark County, Edgar County, Illinois. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 29, 2022, 10:22 PM CDT (03:22 UTC)
Expired: Aug 30, 2022, 1:30 AM CDT
In force: 3 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

Counties Clark County, IL, Edgar County, IL

The radar

The Indianapolis radar (KIND), 131 km from the middle of the area, began a volume at 03:22 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.4 hours before the alert went out and 102 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: 2551 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.2

Open this sounding in Storm Lab

The text

As transmitted.

434 
WGUS53 KILX 300322
FFWILX
ILC023-045-300630-
/O.NEW.KILX.FF.W.0048.220830T0322Z-220830T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
1022 PM CDT Mon Aug 29 2022

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Northern Clark County in east central Illinois...
  Southern Edgar County in east central Illinois...

* Until 130 AM CDT.

* At 1021 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 2.5 inches of rain have 
  fallen. Additional rainfall amounts up to 1 inch are possible in 
  the warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Marshall, Westfield, Vermilion, Clarksville, Oliver, Dennison and 
  Bell Ridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3935 8801 3948 8801 3948 8799 3948 8796
      3949 8796 3950 8796 3951 8796 3952 8795
      3959 8753 3955 8753 3953 8753 3951 8753
      3949 8753 3948 8753 3944 8753 3941 8772

FLASH FLOOD...RADAR INDICATED

$$

37

2 follow-up statements

665 
WGUS73 KILX 300458
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
1158 PM CDT Mon Aug 29 2022

ILC023-045-300630-
/O.CON.KILX.FF.W.0048.000000T0000Z-220830T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark IL-Edgar IL-
1158 PM CDT Mon Aug 29 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM CDT TUESDAY 
FOR NORTHWESTERN CLARK AND SOUTHEASTERN EDGAR COUNTIES...

At 1157 PM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Up to 3.5 inches of rain have 
fallen. Flash flooding is ongoing.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Westfield, Vermilion, Clarksville and Oliver.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3935 8801 3948 8801 3948 8796 3949 8795
      3949 8774 3957 8765 3959 8753 3955 8753
      3953 8753 3951 8753 3949 8753 3948 8753
      3948 8758 3947 8773

FLASH FLOOD...RADAR INDICATED

$$

37

156 
WGUS73 KILX 300625
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
125 AM CDT Tue Aug 30 2022

ILC023-045-300635-
/O.EXP.KILX.FF.W.0048.000000T0000Z-220830T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark IL-Edgar IL-
125 AM CDT Tue Aug 30 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 130 AM CDT EARLY THIS MORNING 
FOR NORTHWESTERN CLARK AND SOUTHEASTERN EDGAR COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3935 8801 3948 8801 3948 8796 3949 8795
      3949 8774 3957 8765 3959 8753 3955 8753
      3953 8753 3951 8753 3949 8753 3948 8753
      3948 8758 3947 8773

$$

Geelhart

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this flash flood warning went out at Aug 29, 9:22 PM CDT, 1 hour earlier.

Area forecast discussion, Aug 29, 9:22 PM CDT, 1 hour before

Area Forecast Discussion
National Weather Service Lincoln IL
922 PM CDT Mon Aug 29 2022

.SYNOPSIS...
Issued at 248 PM CDT Mon Aug 29 2022

Thunderstorms will develop ahead of a cold front across central
Illinois late this afternoon into tonight. Some of the storms
could become strong to severe north of the I-70 corridor...with
the main hazard being damaging wind gusts. Once the cold front
passes, cooler and less humid weather will be on tap for the
remainder of the week.

&&

.UPDATE...
Issued at 859 PM CDT Mon Aug 29 2022

Strong-to-severe thunderstorms will continue to fester this
evening ahead of the cold front as multiple mesoscale boundaries
collide beneath still moderate instability. Despite strengthening
cold pools and an increasingly stable near-sfc environment,
MUCAPE values still range between 1500-2500 J/kg.

The main area of focus this evening has been along a corridor
extending from Decatur to Danville. Thunderstorms have been
occuring repeatedly in this area, which is the same area where the
700mb flow runs parallel to an outflow boundary that developed
early this afternoon. Aside from the pockets of wind damage, heavy
rainfall has been observed and 1-2"/hr rates have been estimated
by radar.

Our expectations for the next 3 hours is for storms to gradually
wane in intensity and coverage, and satellite trends reveal
mostly warming cloud tops. Still, the occasional updraft may pulse
high enough near severe limits. And, with the absence of an
appreciable LLJ and only meager shear ahead of the cold front, our
confidence is high that severe weather will gradually wind down.

&&

.SHORT TERM...(This evening through Tuesday)
ISSUED AT 248 PM CDT Mon Aug 29 2022

19z/2pm surface analysis shows a cold front extending from
Wisconsin into eastern Iowa...with an outflow boundary from
midday convection noted from just north of Rantoul westward to
near Peoria. Robust Cu field has formed ahead of the outflow
boundary: however, latest radar imagery is not showing any
thunderstorm development across central Illinois yet. With surface
dewpoints in the middle to upper 70s, MLCAPEs have climbed above
4000J/kg. Despite the strong instability and presence of a forcing
mechanism, very weak winds aloft have thus far prevented rapid
storm development. Will continue to monitor the outflow boundary,
as scattered cells should develop along it over the next couple of
hours. Any storms that form will be capable of damaging wind gusts
and large hail late this afternoon. Meanwhile further northwest,
storms will eventually develop along the slowly-advancing cold
front, but this may not occur until early this evening. Severe
weather will be possible along the cold front as well, with the
threat gradually decreasing by mid to late evening as the activity
crosses I-72 and drops toward the I-70 corridor. Have updated
hourly PoPs to better reflect current trends and to feature high
chance to likely PoPs this evening as the main cold front
energizes. Also delayed the departure of the showers/storms later
tonight given slower initial development and frontal movement. As
a result, have lingered PoPs everywhere after midnight...with rain
chances ending from northwest to southeast toward dawn Tuesday.

.LONG TERM...(Tuesday night through Monday)
ISSUED AT 248 PM CDT Mon Aug 29 2022

Once the cold front passes, an extended period of cooler and less
humid weather will prevail for the rest of the week before
conditions gradually warm by the weekend. Highs will mainly be in
the lower to middle 80s Tuesday through Thursday, then will push
back into the middle to upper 80s Friday through Monday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 644 PM CDT Mon Aug 29 2022

Isolated strong thunderstorms across the central IL terminals this
evening will likely grow more numerous over the next few hours,
gradually shift southeastward through the evening, and weaken
overnight. All terminals will be under a threat of strong
thunderstorms, if not imminent, until 01Z-03Z. Storm may contain
strong and variable wind gusts up to 50 kts, as well as heavy
rain, MVFR cigs, and IFR vsbys. Improving conditions will take
place overnight, starting as early as 01Z at KPIA, and as late as
05Z at KDEC and KCMI, after a cold front moves through the area.
Winds outside of thunderstorm and thunderstorm outflow influence
should be SW 5-10 kts initially, gradually shifting to W and
eventually NW overnight, becoming NW 10-12 kts with gusts 18-20
kts by 17Z.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

UPDATE...MJA
SYNOPSIS...Barnes
SHORT TERM...Barnes
LONG TERM...Barnes
AVIATION...37

Hazardous weather outlook, Aug 29, 3:04 PM CDT, 7 hours 18 minutes before

Hazardous Weather Outlook
National Weather Service Lincoln IL
304 PM CDT Mon Aug 29 2022

ILZ027>031-036>038-040>057-061-301100-
Knox-Stark-Peoria-Marshall-Woodford-Fulton-Tazewell-McLean-Schuyler-
Mason-Logan-De Witt-Piatt-Champaign-Vermilion-Cass-Menard-Scott-
Morgan-Sangamon-Christian-Macon-Moultrie-Douglas-Coles-Edgar-Shelby-
304 PM CDT Mon Aug 29 2022

This Hazardous Weather Outlook is for central Illinois, east
central Illinois and west central Illinois.

.DAY ONE...Tonight.

Strong to severe thunderstorms are likely late this afternoon and
evening. Damaging straight line winds are the primary hazard,
although localized flash flooding of urban areas will be possible as
well. The highest risk of severe weather will be focused north of a
Havana to Danville line.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed between 4pm and 10pm.

ILZ062-063-066>068-071>073-301100-
Cumberland-Clark-Effingham-Jasper-Crawford-Clay-Richland-Lawrence-
304 PM CDT Mon Aug 29 2022

This Hazardous Weather Outlook is for east central Illinois and
southeast Illinois.

.DAY ONE...Tonight.

Thunderstorms will drop south of the I-70 corridor by late evening.
While widespread severe weather is not expected, isolated damaging
wind gusts and localized flash flooding will be possible.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed after 10pm.

Barnes

In the hours before

Special weather statement, Aug 29, 9:29 PM CDT, 53 minutes before

Special Weather Statement
National Weather Service Lincoln IL
929 PM CDT Mon Aug 29 2022

ILZ054-056-057-061>063-066-067-300300-
Coles-Effingham-Jasper-Clark-Moultrie-Shelby-Cumberland-Edgar-
929 PM CDT Mon Aug 29 2022

...Strong thunderstorms will impact portions of Coles, southern
Edgar, southeastern Moultrie, northwestern Jasper, Clark,
southeastern Shelby, Cumberland and northern Effingham Counties
through 1000 PM CDT...

At 928 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Vermilion to 6 miles south of Shelbyville.
Movement was south at 25 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Strong thunderstorms will be near...
  Paris around 935 PM CDT.
  Vermilion around 940 PM CDT.
  Stewardson around 945 PM CDT.

Other locations in the path of these storms include Beecher City,
Shumway, Effingham, Altamont and Dennison.

This includes the following highways...
 Interstate 57 between mile markers 154 and 192.
 Interstate 70 between mile markers 79 and 154.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
central and east central Illinois.

&&

LAT...LON 3934 8756 3934 8757 3932 8760 3898 8880
      3940 8879 3974 8753 3936 8753
TIME...MOT...LOC 0228Z 340DEG 20KT 3965 8759 3932 8876

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

37

Local storm report, Aug 29, 9:49 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
949 PM CDT MON AUG 29 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0932 PM     TSTM WND GST     1 S ALLENVILLE          39.55N 88.53W
08/29/2022  M74 MPH          MOULTRIE           IL   TRAINED SPOTTER

&&

Local storm report, Aug 29, 9:54 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
954 PM CDT MON AUG 29 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0745 PM     TSTM WND DMG     1 WSW ARMSTRONG         40.30N 87.89W
08/29/2022                   VERMILION          IL   PUBLIC

            DELAYED REPORT. TREE DOWN ON POWER LINES IN
            TOWN.

&&

Special weather statement, Aug 29, 9:57 PM CDT, 25 minutes before

Special Weather Statement
National Weather Service Lincoln IL
957 PM CDT Mon Aug 29 2022

ILZ054-056-061-300330-
Coles-Moultrie-Shelby-
957 PM CDT Mon Aug 29 2022

...Strong thunderstorms will impact portions of central Coles,
southeastern Moultrie and east central Shelby Counties through 1030
PM CDT...

At 956 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Ashmore to near Shelbyville. Movement was
southeast at 15 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Strong thunderstorms will be near...
  Charleston and Rardin around 1000 PM CDT.
  Ashmore around 1010 PM CDT.

Other locations in the path of these storms include Windsor.

This includes Interstate 57 between mile markers 183 and 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3949 8798 3933 8879 3950 8885 3962 8805
TIME...MOT...LOC 0256Z 292DEG 12KT 3953 8809 3945 8876

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH

37

Local storm report, Aug 29, 9:59 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
959 PM CDT MON AUG 29 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0630 PM     TSTM WND DMG     1 SSW SALISBURY         39.88N 89.80W
08/29/2022                   SANGAMON           IL   LAW ENFORCEMENT

            DELAYED REPORT. TREE DOWN OVER RTE 97.

&&

Local storm report, Aug 29, 10:05 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LINCOLN IL
1005 PM CDT MON AUG 29 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0712 PM     TSTM WND DMG     POTOMAC                 40.31N 87.80W
08/29/2022                   VERMILION          IL   EMERGENCY MNGR

            TREE AND POWER POLE DOWN AND ON FIRE NEAR
            THE 100 BLOCK OF GRANT ST.

0720 PM     TSTM WND GST     2 NNW DANVILLE          40.17N 87.65W
08/29/2022  M50 MPH          VERMILION          IL   EMERGENCY MNGR

0722 PM     TSTM WND DMG     BISMARCK                40.26N 87.61W
08/29/2022                   VERMILION          IL   EMERGENCY MNGR

            TREES DOWN.

0730 PM     TSTM WND DMG     TILTON                  40.09N 87.64W
08/29/2022                   VERMILION          IL   EMERGENCY MNGR

            POWER POLES DOWN AND TRANSFORMER ON FIRE
            NEAR THE 1700 BLOCK OF WASHINGTON RD.

0735 PM     TSTM WND DMG     2 SW VERMILION REGIONAL 40.18N 87.63W
08/29/2022                   VERMILION          IL   EMERGENCY MNGR

            POWER POLES DOWN ON POLAND RD IN DANVILLE.

0735 PM     TSTM WND DMG     2 NNW DANVILLE          40.17N 87.65W
08/29/2022                   VERMILION          IL   EMERGENCY MNGR

            LARGE LIMBS DOWN ON DENMARK RD 2 NW OF
            DANVILLE.

0740 PM     TSTM WND DMG     2 NE OAKWOOD            40.14N 87.74W
08/29/2022                   VERMILION          IL   EMERGENCY MNGR

            TREE DAMAGE AND 0.75 INCH HAIL REPORTED IN
            KICKAPOO STATE PARK.

0740 PM     TSTM WND DMG     CATLIN                  40.07N 87.70W
08/29/2022                   VERMILION          IL   EMERGENCY MNGR

            TREES DOWN.

0745 PM     TSTM WND DMG     1 WSW ARMSTRONG         40.30N 87.89W
08/29/2022                   VERMILION          IL   PUBLIC

            DELAYED REPORT. TREE DOWN ON POWER LINES IN
            TOWN.

0630 PM     TSTM WND DMG     1 SSW SALISBURY         39.88N 89.80W
08/29/2022                   SANGAMON           IL   LAW ENFORCEMENT

            DELAYED REPORT. TREE DOWN OVER RTE 97.

0932 PM     TSTM WND GST     1 S ALLENVILLE          39.55N 88.53W
08/29/2022  M74 MPH          MOULTRIE           IL   TRAINED SPOTTER

1210 PM     TSTM WND DMG     2 S LACON               40.99N 89.41W
08/29/2022                   MARSHALL           IL   LAW ENFORCEMENT

            TREE DOWN ON HICKORY GROVE ROAD.

0745 PM     TSTM WND DMG     ARGENTA                 39.99N 88.82W
08/29/2022                   MACON              IL   LAW ENFORCEMENT

            POWER LINES DOWN AND TREE DOWN IN ARGENTA.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 7:14 PM CDT	Flash Flood Warning	ILX	Cass, Menard, Sangamon	3 hr
Aug 29, 7:15 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Vermilion	60 min
Aug 29, 7:31 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, Macon, Piatt	44 min
Aug 29, 7:33 PM CDT	Flash Flood Warning	ILX	Champaign, Vermilion	4 hr
Aug 29, 7:38 PM CDT	Special Weather Statement	ILX	Sangamon	37 min
Aug 29, 7:52 PM CDT	Severe Thunderstorm Warning	ILX	Macon, Moultrie, Piatt	38 min
Aug 29, 8:08 PM CDT	Special Weather Statement	ILX	Cass, Menard, Morgan	52 min
Aug 29, 8:15 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Vermilion	34 min
Aug 29, 8:17 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Douglas, Moultrie, Piatt	43 min
Aug 29, 8:28 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Douglas, Moultrie, Shelby	32 min
Aug 29, 8:59 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Douglas, Edgar	31 min
Aug 29, 9:17 PM CDT	Flash Flood Warning	ILX	Morgan, Sangamon	3 hr
Aug 29, 9:29 PM CDT	Special Weather Statement	ILX	Clark, Coles, Cumberland, Edgar, Effingham	31 min
Aug 29, 9:57 PM CDT	Special Weather Statement	ILX	Coles, Shelby	33 min
Aug 29, 10:07 PM CDT	Flash Flood Warning	ILX	Coles, Moultrie, Shelby	3 hr
Aug 29, 10:51 PM CDT	Flash Flood Warning	ILX	Champaign, Vermilion	3 hr

Nearby

Flash Flood Warnings in Illinois, 2022 Every flash flood warning in 2022

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.