Alert archive / Illinois / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 82, NWS Lincoln, IL

June 13, 20154 counties in Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 13, 2015, 8:46 PM CDT for 4 counties in Illinois. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 13, 2015, 8:46 PM CDT (01:46 UTC)
Expired: Jun 13, 2015, 9:15 PM CDT
In force: 29 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties DeWitt County, IL, Logan County, IL, McLean County, IL, Tazewell County, IL

The radar

The Lincoln radar (KILX), 19 km from the middle of the area, began a volume at 01:50 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 severe thunderstorm 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, 1.8 hours before the alert went out and 53 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: 253 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1117 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

793 
WUUS53 KILX 140146
SVRILX
ILC039-107-113-179-140215-
/O.NEW.KILX.SV.W.0082.150614T0146Z-150614T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
846 PM CDT SAT JUN 13 2015

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN LOGAN COUNTY IN CENTRAL ILLINOIS...
  SOUTHEASTERN TAZEWELL COUNTY IN CENTRAL ILLINOIS...
  SOUTHWESTERN MCLEAN COUNTY IN CENTRAL ILLINOIS...
  NORTHWESTERN DE WITT COUNTY IN CENTRAL ILLINOIS...

* UNTIL 915 PM CDT

* AT 846 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ATLANTA...OR
  9 MILES NORTHEAST OF LINCOLN...MOVING NORTHEAST AT 35 MPH.

  HAZARD...70 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT CONSIDERABLE TREE DAMAGE. DAMAGE IS LIKELY TO 
           MOBILE HOMES...ROOFS AND OUTBUILDINGS. 

* LOCATIONS IMPACTED INCLUDE...
  ATLANTA...MCLEAN...STANFORD...WAYNESVILLE AND ARMINGTON. 

THIS INCLUDES INTERSTATE 55 BETWEEN MILE MARKERS 136 AND 151.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4017 8919 4027 8938 4048 8926 4034 8899
TIME...MOT...LOC 0146Z 217DEG 29KT 4025 8925 

HAIL...<.75IN
WIND...70MPH
 
$$

AUTEN

1 follow-up statement

237 
WWUS53 KILX 140210
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
910 PM CDT SAT JUN 13 2015

ILC039-107-113-179-140220-
/O.EXP.KILX.SV.W.0082.000000T0000Z-150614T0215Z/
LOGAN-TAZEWELL-MCLEAN-DE WITT-
910 PM CDT SAT JUN 13 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LOGAN...
SOUTHEASTERN TAZEWELL...SOUTHWESTERN MCLEAN AND NORTHWESTERN DE WITT
COUNTIES WILL EXPIRE AT 915 PM CDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING WILL BE ALLOWED TO
EXPIRE.

LAT...LON 4017 8919 4027 8938 4048 8926 4034 8899
TIME...MOT...LOC 0209Z 217DEG 29KT 4025 8925 

$$

AUTEN

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jun 13, 6:55 PM CDT, 1 hour 51 minutes earlier.

Area forecast discussion, Jun 13, 6:55 PM CDT, 1 hour 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
655 PM CDT SAT JUN 13 2015

.SHORT TERM...(TONIGHT)
ISSUED AT 206 PM CDT SAT JUN 13 2015

MOIST DEEP SOUTHWEST FLOW CONTINUES TO PROVIDE PERIODS OF SHOWERS
AND THUNDERSTORMS TO CENTRAL AND SOUTHEAST ILLINOIS. ALTHOUGH
ATMOSPHERE ISN'T QUITE AS MOIST AS YESTERDAY (PER 12Z KILX
SOUNDING). POTENTIAL STILL REMAINS FOR SOME EFFICIENT CONVECTION
AND POSSIBLE PRECIP LOADING PRODUCING STRONG WINDS. ALTHOUGH
INITIAL CONVECTION THIS AFTERNOON HAS DEVELOPED IN SAME AREA AS
LAST NIGHTS LINE WHERE INSTABILITY AXIS REMAINS...LATEST MESOSCALE
MODELS SUGGEST PRECIPITATION DEVELOPING OVER MISSOURI WILL BE
BIGGER ORGANIZED THREAT AS IT MOVES NORTHEAST INTO WESTERN
ILLINOIS. INDIVIDUAL STORMS WILL LIKELY BE PRIMED TO PRODUCE
LOCALIZED STRONG WINDS. IF ORGANIZED LINES CAN DEVELOP...THERE IS
POTENTIAL FOR MORE WIDESPREAD DAMAGING WINDS.

LATEST HRRR SUGGEST SCATTERED CONVECTION EAST OF I-55 WILL BE MORE
DIURNAL IN NATURE DRIVEN BY INSTABILITY AND A LACK OF SHEAR.  MORE
SHEAR IS PROGGED OVER WESTERN ILLINOIS AND PRECIP MAY LINGER INTO
THE EARLY MORNING.

GROUND REMAINS LOCALLY SATURATED AND HEAVY PRECIPITATION POTENTIAL
LEADS TO SOME FLOODING POTENTIAL IN WESTERN ILLINOIS PER MPD ISSUED
BY WPC. AN ESF HAS BEEN ISSUED FOR LONG-RANGE HEAVY RAIN THREAT AND
WILL MENTION POTENTIAL FOR HEAVY RAIN IN GRIDS AND WORDED FORECASTS.

.LONG TERM...(SUNDAY THROUGH SATURDAY)
ISSUED AT 206 PM CDT SAT JUN 13 2015

LITTLE CHANGE IS EXPECTED IN THE FORECAST OVER THE NEXT 4 DAYS...AS
A FRONTAL BOUNDARY LINGERS ACROSS ILLINOIS AND A LARGE RIDGE IN
THE SOUTHEAST STATES PROVIDES A SOUTHWEST UPPER FLOW INTO
ILLINOIS. PERIODIC SHORTWAVES, SOME CONVECTIVELY INDUCED, WILL
RIDE THE SOUTHWEST FLOW INTO OUR FORECAST AREA. THERE ARE LARGE
UNCERTAINTIES IN TIMING AND LOCATION OF THE WAVES IN THE MODELS.
HOWEVER, THERE IS ENOUGH AGREEMENT OVER ABNORMALLY HIGH MOISTURE
CONTENT AND MODERATE INSTABILITY THAT WE KEPT LARGE PORTIONS OF
CENTRAL AND SOUTHEAST ILLINOIS IN LIKELY POPS EACH PERIOD THROUGH
WEDNESDAY.

SEVERE CHANCES APPEAR TO BE HIGHER ON SUNDAY AFTERNOON/EVE AND AGAIN
ON MONDAY, BUT WE CANT RULE OUT INCREASING CHANCES TUESDAY AND
WEDNESDAY AS THOSE DAYS GET CLOSER. PRECIP LOADING IN MANY
THUNDERSTORMS THROUGH AT LEAST MONDAY WILL BE SUFFICIENT TO PRODUCE
DOWNBURST WINDS. 0-6KM WIND SHEAR IS EXPECTED TO REMAIN BELOW 30KT,
WITH UNI-DIRECTIONAL SHEAR SUPPORTING THUNDERSTORMS TRAINING IN A
LINE. SO MAIN HAZARDS SHOULD CONTINUE TO BE DAMAGING WINDS AND FLASH
FLOODING. WILL MONITOR HAIL POTENTIAL, SINCE EVEN A SLIGHT LOWERING
OF THE FREEZING LEVEL WOULD INCREASE HAIL PRODUCTION.

WE CONSIDERED A FLASH FLOOD WATCH, BUT MODEL UNCERTAINTIES HAVE KEPT
A LOW CONFIDENCE IN ANY PARTICULAR LOCATION SEEING THE AXIS OF HEAVY
RAINS. WILL CONTINUE TO MONITOR CLOSELY IN THE COMING MODEL RUNS FOR
A POTENTIAL OPPORTUNITY TO HIGHLIGHT AN AREA OF CONCERN. FOR NOW,
WILL HIGHLIGHT THE FLOODING THREAT IN THE HAZARDOUS WEATHER OUTLOOK.

THE FAR EXTENDED STILL CONTAINS POPS IN THE CHANCE CATEGORY THROUGH
SATURDAY, BUT THERE ARE INDICATIONS THAT THE FRONT MAY SAG FAR
ENOUGH SOUTH OF OUR COUNTIES TO PROVIDE MORE SIGNIFICANT BREAKS IN
THE RAIN CHANCES FROM THURSDAY THROUGH SATURDAY.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z SUNDAY EVENING)
ISSUED AT 655 PM CDT SAT JUN 13 2015

VFR CONDITIONS ARE EXPECTED AT ALL SITES NEXT 24HRS. CURRENT RADAR
LOOPS INDICATE THAT ONLY ONE SITE MIGHT HAVE PCPN...AND THAT IS
SPI OVER THE NEXT SEVERAL HOURS. SO WILL KEEP THEM WITH VCTS FOR
NOW. WITH ALL OTHER SITES WILL HAVE JUST SCATTERED LOWER CLOUDS
AND BROKEN MID CLOUDS FOR THE REST OF THE NIGHT. BY LATE
MORNING...EXPECTING MID CLOUDS TO DISSIPATE WITH SCATTERED CU
CONTINUING. IN THE EARLY MORNING...HIGH RES MODELS SHOW SOME LOWER
CLOUDS GETTING INTO ONLY PIA AND SPI TAFS SO HAVE A TEMPO TROUP
FOR BOTH SITES WITH BROKEN CIGS AROUND 2.5KFT. WINDS SHOULD BE
SOUTHERLY THROUGH THE PERIOD.

&&

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

SHORT TERM...BARKER
LONG TERM...SHIMON
AVIATION...AUTEN

Hazardous weather outlook, Jun 13, 3:06 PM CDT, 5 hours 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
306 PM CDT SAT JUN 13 2015

ILZ027>031-036>038-040>042-047-048-140600-
CASS-FULTON-KNOX-LOGAN-MARSHALL-MASON-MCLEAN-MENARD-PEORIA-
SCHUYLER-STARK-TAZEWELL-WOODFORD-
306 PM CDT SAT JUN 13 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS...NORTH CENTRAL ILLINOIS AND WEST CENTRAL ILLINOIS.

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS WILL REDEVELOP ACROSS THE AREA AGAIN
THIS AFTERNOON AND EVENING. A FEW OF THE STORMS MAY CONTAIN
DAMAGING WINDS AND SMALL HAIL. THE THREAT FOR ADDITIONAL HEAVY
RAINFALL WILL CONTINUE WHICH WILL PRODUCE LOCALIZED FLOODING AND
WORSEN AREAS OF RIVER FLOODING ALREADY IN PROGRESS. MINOR TO
MODERATE FLOODING WILL CONTINUE ALONG THE ILLINOIS AND SPOON
RIVERS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

PERIODIC THUNDERSTORM CHANCES WILL CONTINUE SUNDAY THROUGH
FRIDAY. THE THREAT FOR ORGANIZED AFTERNOON AND EVENING SEVERE
WEATHER WILL PERSIST OVER THE AREA SUNDAY AND MONDAY. IN ADDITION
TO THE SEVERE RISK...THE POTENTIAL FOR ADDITIONAL HEAVY RAINFALL
WILL CONTINUE THROUGH MUCH OF NEXT WEEK ENHANCING THE RIVER AND
FLASH FLOOD THREATS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED. REPORTS OF HEAVY RAINFALL OR
FLOODING WOULD BE APPRECIATED.

ILZ043>046-049>051-053-140600-
CHAMPAIGN-DE WITT-MACON-MORGAN-PIATT-SANGAMON-SCOTT-VERMILION-
306 PM CDT SAT JUN 13 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS...EAST CENTRAL ILLINOIS AND WEST CENTRAL ILLINOIS.

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS THE AREA THIS
AFTERNOON AND EVENING. A FEW OF THE STORMS MAY CONTAIN STRONG
WINDS AND SMALL HAIL. THE THREAT FOR ADDITIONAL HEAVY RAINFALL
WILL CONTINUE WHICH WILL PRODUCE LOCALIZED FLOODING AND WORSEN
AREAS OF RIVER FLOODING ALREADY IN PROGRESS. MINOR TO MODERATE
FLOODING WILL CONTINUE ALONG THE ILLINOIS AND SANGAMON RIVERS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

PERIODIC THUNDERSTORM CHANCES WILL CONTINUE SUNDAY THROUGH
FRIDAY. THE THREAT FOR AFTERNOON AND EVENING ORGANIZED SEVERE
WEATHER WILL INCREASE OVER THE AREA AGAIN SUNDAY AND MONDAY. IN
ADDITION TO THE SEVERE RISK...THE POTENTIAL FOR ADDITIONAL HEAVY
RAINFALL WILL CONTINUE THROUGH MUCH OF NEXT WEEK ENHANCING THE
RIVER AND FLASH FLOOD THREATS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. HOWEVER...REPORTS OF
HEAVY RAINFALL OR FLOODING WOULD BE APPRECIATED.

ILZ052-054>057-061>063-066>068-071>073-140600-
CHRISTIAN-CLARK-CLAY-COLES-CRAWFORD-CUMBERLAND-DOUGLAS-EDGAR-
EFFINGHAM-JASPER-LAWRENCE-MOULTRIE-RICHLAND-SHELBY-
306 PM CDT SAT JUN 13 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS...EAST CENTRAL ILLINOIS...SOUTH CENTRAL ILLINOIS AND
SOUTHEAST ILLINOIS.

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS THE AREA THIS
AFTERNOON AND EVENING. A FEW OF THE STORMS MAY CONTAIN STRONG
WINDS AND SMALL HAIL. THE THREAT FOR ADDITIONAL HEAVY RAINFALL
WILL CONTINUE WHICH WILL PRODUCE LOCALIZED FLOODING AND WORSEN
AREAS OF RIVER FLOODING ALREADY IN PROGRESS. MINOR FLOODING WILL
CONTINUE ALONG THE WABASH AND LITTLE WABASH BASINS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

PERIODIC THUNDERSTORM CHANCES WILL CONTINUE SUNDAY THROUGH
FRIDAY. THE THREAT FOR ORGANIZED SEVERE WEATHER WILL INCREASE
OVER THE AREA MONDAY AFTERNOON AND EVENING. IN ADDITION TO THE
SEVERE RISK...THE POTENTIAL FOR ADDITIONAL HEAVY RAINFALL WILL
CONTINUE THROUGH MUCH OF NEXT WEEK ENHANCING THE RIVER AND FLASH
FLOOD THREATS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. HOWEVER...REPORTS OF
HEAVY RAINFALL OR FLOODING WOULD BE APPRECIATED.

BARKER

In the hours before

Special weather statement, Jun 13, 2:57 PM CDT, 5 hours 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
257 PM CDT SAT JUN 13 2015

ILZ045-046-132045-
CHAMPAIGN-VERMILION-
257 PM CDT SAT JUN 13 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CHAMPAIGN COUNTY UNTIL
345 PM CDT...

AT 256 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
LAKE OF THE WOODS...OR 6 MILES NORTHWEST OF CHAMPAIGN...MOVING
NORTHEAST AT 30 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
CHAMPAIGN...RANTOUL...MAHOMET...THOMASBORO...GIFFORD...LAKE OF THE
WOODS...ROYAL...PENFIELD AND FLATVILLE.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 57 BETWEEN MILE MARKERS 237 AND 254.
 INTERSTATE 74 BETWEEN MILE MARKERS 171 AND 179.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN LINCOLN.

&&

LAT...LON 4022 8794 4019 8794 4012 8839 4022 8843
      4028 8835 4040 8807 4040 8793 4023 8793
TIME...MOT...LOC 1956Z 247DEG 28KT 4020 8833

BARKER

Local storm report, Jun 13, 6:35 PM CDT, 2 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
635 PM CDT SAT JUN 13 2015

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

0600 PM     HEAVY RAIN       HOPEWELL                40.98N 89.46W
06/13/2015  M1.13 INCH       MARSHALL           IL   MESONET

            RAIN FELL BETWEEN 530-600 PM.

&&

JRP

Local storm report, Jun 13, 6:54 PM CDT, 1 hour 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
654 PM CDT SAT JUN 13 2015

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

0653 PM     HEAVY RAIN       HENRY                   41.11N 89.36W
06/13/2015  M1.60 INCH       MARSHALL           IL   TRAINED SPOTTER

            RAIN FELL IN ONE HOUR.

&&

JRP

Local storm report, Jun 13, 8:02 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
802 PM CDT SAT JUN 13 2015

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

0800 PM     HEAVY RAIN       ALTONA                  41.12N 90.16W
06/13/2015  M1.13 INCH       KNOX               IL   CO-OP OBSERVER

            SINCE 6 AM

&&

JRP

Local storm report, Jun 13, 8:42 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
842 PM CDT SAT JUN 13 2015

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

0830 PM     HEAVY RAIN       HENRY                   41.11N 89.36W
06/13/2015  M1.78 INCH       MARSHALL           IL   EMERGENCY MNGR

            RAIN FELL BETWEEN 525 AND 625 PM. FLOODING ALL AROUND
            HENRY. CONSIDERABLE PONDING OF WATER ON CITY STREETS.

&&

JRP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 8:06 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Scott	54 min
Jun 13, 8:22 PM CDT	Severe Thunderstorm Warning	ILX	Logan	23 min
Jun 14, 10:57 AM CDT	River Flood Warning	ILX	Marshall, Putnam	44 days
Jun 14, 3:21 PM CDT	Flash Flood Warning	ILX	Champaign, McLean, Piatt	3 hr
Jun 14, 6:10 PM CDT	Flash Flood Warning	ILX	DeWitt, Logan, McLean, Mason, Menard, Tazewell	6 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2015 Every severe thunderstorm warning in 2015

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.