Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 16, NWS Lincoln, IL

April 28, 20144 counties in Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 28, 2014, 5:56 PM CDT for 4 counties in Illinois. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 28, 2014, 5:56 PM CDT (22:56 UTC)
Expired: Apr 28, 2014, 6:45 PM CDT
In force: 49 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Christian County, IL, Macon County, IL, Moultrie County, IL, Shelby County, IL

The radar

The Lincoln radar (KILX), 71 km from the middle of the area, began a volume at 22:57 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.

What was reported inside it

Time	Report	Where	Remark
Apr 28, 6:13 PM CDT	TSTM WND DMG	2 Nw Tower Hill, IL	ROOF DAMAGE TO A MACHINE SHED...DEBRIS STREWN ACROSS A FIELD. DAMAGE TO SEVERAL TREES ALSO.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 17 minutes after it went out.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 28, 1:11 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 72 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 719 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 140 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.

839 
WUUS53 KILX 282256
SVRILX
ILC021-115-139-173-282345-
/O.NEW.KILX.SV.W.0016.140428T2256Z-140428T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
556 PM CDT MON APR 28 2014

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CHRISTIAN COUNTY IN CENTRAL ILLINOIS...
  MACON COUNTY IN CENTRAL ILLINOIS...
  WESTERN MOULTRIE COUNTY IN CENTRAL ILLINOIS...
  WESTERN SHELBY COUNTY IN CENTRAL ILLINOIS...

* UNTIL 645 PM CDT

* AT 552 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM BLUE MOUND TO MOWEAQUA TO PANA TO 6 MILES NORTH OF
  RAMSEY...AND MOVING NORTHEAST AT 35 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
           ROOFS...SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE...
  DECATUR...SHELBYVILLE...MACON...TOWER HILL...HARRISTOWN...MOUNT
  ZION...LAKEWOOD...LONG CREEK...DALTON CITY...WESTERVELT...
  FORSYTH...OREANA...BETHANY...FINDLAY...BOODY...ELWIN...HERVEY
  CITY...DECATUR AIRPORT...OAKLEY AND LAKE CITY.

THIS INCLUDES INTERSTATE 72 BETWEEN MILE MARKERS 126 AND 149.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3923 8915 3938 8909 3960 8908 3973 8923
      3983 8919 4000 8896 3992 8875 3979 8875
      3979 8870 3967 8864 3942 8876 3921 8905
      3921 8913
TIME...MOT...LOC 2257Z 224DEG 30KT 3976 8915 3967 8898
          3946 8900 3926 8907

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH

$$

07

2 follow-up statements

819 
WWUS53 KILX 282319
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
619 PM CDT MON APR 28 2014

ILC021-282328-
/O.CAN.KILX.SV.W.0016.000000T0000Z-140428T2345Z/
CHRISTIAN IL-
619 PM CDT MON APR 28 2014

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CHRISTIAN COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF
THE WARNED AREA.

LAT...LON 3924 8915 3935 8905 3935 8903 3965 8903
      3975 8905 3983 8919 4000 8896 3992 8875
      3979 8875 3979 8870 3967 8864 3942 8876
      3921 8905 3921 8913
TIME...MOT...LOC 2318Z 224DEG 30KT 3989 8899 3980 8882
          3952 8884 3931 8901

$$

ILC115-139-173-282345-
/O.CON.KILX.SV.W.0016.000000T0000Z-140428T2345Z/
MACON IL-MOULTRIE IL-SHELBY IL-
619 PM CDT MON APR 28 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
SHELBY...WESTERN MOULTRIE AND MACON COUNTIES UNTIL 645 PM CDT...

AT 613 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM HARRISTOWN TO MOUNT ZION TO WESTERVELT TO 8 MILES
SOUTH OF PANA...AND MOVING NORTHEAST AT 35 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
         ROOFS...SIDING AND TREES.

LOCATIONS IMPACTED INCLUDE...
DECATUR...SHELBYVILLE...DALTON CITY...WESTERVELT...FORSYTH...
LAKEWOOD...BETHANY...OREANA...FINDLAY...DECATUR AIRPORT...OAKLEY AND
LAKE CITY.

INTERSTATE 72 BETWEEN MILE MARKERS 126 AND 149.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

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

&&

LAT...LON 3924 8915 3935 8905 3935 8903 3965 8903
      3975 8905 3983 8919 4000 8896 3992 8875
      3979 8875 3979 8870 3967 8864 3942 8876
      3921 8905 3921 8913
TIME...MOT...LOC 2318Z 224DEG 30KT 3989 8899 3980 8882
          3952 8884 3931 8901

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH

$$

07

404 
WWUS53 KILX 282341
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
641 PM CDT MON APR 28 2014

ILC115-139-173-282351-
/O.EXP.KILX.SV.W.0016.000000T0000Z-140428T2345Z/
MACON IL-MOULTRIE IL-SHELBY IL-
641 PM CDT MON APR 28 2014

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SHELBY...WESTERN
MOULTRIE AND MACON COUNTIES WILL EXPIRE AT 645 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 7 PM CDT.

LAT...LON 3924 8915 3935 8905 3935 8903 3965 8903
      3975 8905 3983 8919 4000 8896 3992 8875
      3979 8875 3979 8870 3967 8864 3942 8876
      3921 8905 3921 8913
TIME...MOT...LOC 2341Z 224DEG 30KT 3999 8876 3990 8859
          3962 8862 3941 8879

$$

07

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 Apr 28, 3:17 PM CDT, 2 hours 39 minutes earlier.

Area forecast discussion, Apr 28, 3:17 PM CDT, 2 hours 39 minutes before

Area Forecast Discussion
National Weather Service Lincoln IL
317 PM CDT Mon Apr 28 2014

.DISCUSSION...
ISSUED 317 PM CDT Mon Apr 28 2014

Main concerns will be storms developing over the area and moving
in from the west this afternoon and early tonight. Then the
concern will shift and become the continue chances of diurnal
precip for the rest of the week as the upper level low slowly
drifts easward into the Great Lakes region later this week. Models
look ok with the overall pattern and sfc features through the
period. Only differences seen will be in the mesoscale features
for rest of the afternoon and into tonight.

SHORT TERM...Tonight through Thursday

Tornado watch continues til 7pm as storms have fired on the dry
line in MO early this afternoon. These storms will be moving
northeast and northerly during the period over the western parts
of the area. Hail appears to be the main threat right now, but
isolated tornadoes will also be possible if the storms begin to
rotate. The storms are low-topped and will remain that way.
Thunderstorms will be possible again tomorrow as the upper level
low will still be northwest of the area, though closer than today.
Severe weather is not expected tomorrow as the best moisture will
have moved east of the area. Skies will also be cloudy south of
the low system, so instability will be quite low. Then diurnal
showers will be possible remainder of the period as the the
forecast area remains in cyclonic flow through the week. This flow
will also have temps much cooler through the period.

LONG TERM...Thursday night through Monday

Cyclonic flow continues through the rest of the week and into the
weekend. Then by end of the weekend, the system will push out of
the area. We will finally have some dry periods as high pressure
builds in for a brief period. Then another system is expected to
move into the area for Sunday.

Temps will remain on the cool side through the period.

Auten
&&

.AVIATION...
ISSUED 1255 PM CDT Mon Apr 28 2014

A warm front near I-74 will lift ne during this afternoon as
strong 989 mb low pressure over east central Nebraska moves to the
NE/IA/MO border this evening. Low pressure then moves into nw IL
and se IA by 18Z/Tue with dry line over central MO moving east
across central IL during this evening. Ceilings below 1k ft at BMI
should lift to MVFR next hour while MVFR ceilings possible across
central IL this afternoon. Showers and thunderstorms to develop
over central IL by mid afternoon and become more numerous late
afternoon and early evening and then diminish from west to east
between 02Z and 05Z as dry line moves through. Strong to severe
thunderstorms quickly developing along dry line over central MO
early this afternoon. MVFR visibilities and ceilings expected
with convection and possibly briefly lower with stronger storms.
Scattered showers and isolated thunderstorms to develop during Tue
afternoon after 18Z/Tue. Breezy ESE winds turning SSE 14-20 kts
and gusts of 24-33 kts. Winds have already shifted south at SPI,
DEC and CMI. South winds diminish to 5-10 kts later this evening
and overnight. Breezy ssw winds 12-18 kts with gusts 18-25 kts
after 14Z Tue.

07
&&

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

Hazardous weather outlook, Apr 28, 3:42 PM CDT, 2 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
342 PM CDT MON APR 28 2014

ILZ027>031-036>038-040>057-061-291100-
CASS-CHAMPAIGN-CHRISTIAN-COLES-DE WITT-DOUGLAS-EDGAR-FULTON-KNOX-
LOGAN-MACON-MARSHALL-MASON-MCLEAN-MENARD-MORGAN-MOULTRIE-PEORIA-
PIATT-SANGAMON-SCHUYLER-SCOTT-SHELBY-STARK-TAZEWELL-VERMILION-
WOODFORD-
342 PM CDT MON APR 28 2014

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

.DAY ONE...TONIGHT

SCATTERED STRONG TO SEVERE THUNDERSTORMS WILL MOVE ACROSS THE AREA
LATE THIS AFTERNOON AND INTO EARLY THIS EVENING AS A SLOW MOVING STORM
SYSTEM CONTINUES TO IMPACT THE AREA. SOME OF THE STRONGER STORMS
COULD PRODUCE LARGE HAIL AND ISOLATED TORNADOES. DAMAGING WINDS
WILL ALSO BE A THREAT. HEAVY RAINS AND FREQUENT LIGHTNING ARE ALSO
POSSIBLE WITH THESE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE STORM SYSTEM WILL CONTINUE TO IMPACT THE AREA TUESDAY...WITH
THUNDERSTORMS STILL POSSIBLE. HOWEVER SEVERE THUNDERSTORMS ARE NOT
ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EARLY
EVENING UNTIL SUNSET...PRIMARILY BETWEEN 2 PM AND 8 PM.

ILZ062-063-066>068-071>073-291100-
CLARK-CLAY-CRAWFORD-CUMBERLAND-EFFINGHAM-JASPER-LAWRENCE-RICHLAND-
342 PM CDT MON APR 28 2014

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

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS WILL REDEVELOP LATE THIS AFTERNOON AND
LINGER INTO THIS EVENING AS A SLOW MOVING STORM SYSTEM CONTINUES
TO IMPACT THE AREA. A FEW OF THE STORMS HAVE THE POTENTIAL TO BE
SEVERE. LARGE HAIL AND DAMAGING WINDS ARE THE PRIMARY THREATS...
BUT AN ISOLATED TORNADO IS ALSO POSSIBLE. HEAVY RAINS AND FREQUENT
LIGHTNING ARE ALSO POSSIBLE WITH THESE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE STORM SYSTEM WILL CONTINUE TO IMPACT THE AREA TUESDAY...WITH
THUNDERSTORMS STILL POSSIBLE. HOWEVER SEVERE THUNDERSTORMS ARE NOT
ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EARLY
EVENING UNTIL SUNSET...PRIMARILY BETWEEN 2 PM AND 8 PM.

AUTEN

In the hours before

Local storm report, Apr 28, 3:57 PM CDT, 1 hour 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
357 PM CDT MON APR 28 2014

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

0350 PM     HAIL             BEARDSTOWN              40.01N 90.43W
04/28/2014  M0.88 INCH       CASS               IL   TRAINED SPOTTER

&&

25

Special weather statement, Apr 28, 4:16 PM CDT, 1 hour 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
416 PM CDT MON APR 28 2014

ILZ047-048-050-051-282200-
CASS-MENARD-MORGAN-SANGAMON-
416 PM CDT MON APR 28 2014

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN MORGAN...SOUTHEASTERN
CASS...SOUTHERN MENARD AND WESTERN SANGAMON COUNTIES UNTIL 500 PM
CDT...

AT 414 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM LITERBERRY TO
FRANKLIN TO WAVERLY...MOVING NORTHEAST AT 35 MPH.

PENNY SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THESE
STORMS.

LOCATIONS IMPACTED INCLUDE...
  ALEXANDER...
  DIVERNON...
  AUBURN...
  NEW BERLIN...
  LOAMI...
  CHATHAM...

OTHER LOCATIONS AFFECTED INCLUDE...JACKSONVILLE MUNICIPAL AIRPORT...
SOUTH JACKSONVILLE...LAKE JACKSONVILLE...LOWDER...THAYER AND
SINCLAIR.

PEOPLE NEAR THESE LOCATIONS SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR POSSIBLE WARNINGS...AND BE PREPARED TO TAKE
APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

LAT...LON 3981 9036 3993 8984 3994 8973 3956 8962
      3952 8970 3952 9008
TIME...MOT...LOC 2116Z 204DEG 30KT 3982 9025 3965 9007
          3955 8998

07

Local storm report, Apr 28, 4:30 PM CDT, 1 hour 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
430 PM CDT MON APR 28 2014

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

0410 PM     TSTM WND DMG     LEWISTOWN               40.40N 90.16W
04/28/2014                   FULTON             IL   EMERGENCY MNGR

            GARAGE DESTROYED AT HEDGECOMB ROAD IN LEWISTON FROM
            COUNTRY EMA.

&&

EJL

Local storm report, Apr 28, 4:54 PM CDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
454 PM CDT MON APR 28 2014

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

0435 PM     HAIL             KNOXVILLE               40.91N 90.29W
04/28/2014  M1.00 INCH       KNOX               IL   MESONET

            NICKEL TO QUARTER-SIZED HAIL COVERING GROUND...SWOP
            REPORT.

0435 PM     TSTM WND GST     KNOXVILLE               40.91N 90.29W
04/28/2014  E55 MPH          KNOX               IL   MESONET

            ESTIMATED 50 TO 55 MPH THUNDERSTORM WIND GUSTS...SWOP
            REPORT.

&&

EJL

Local storm report, Apr 28, 5:25 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
525 PM CDT MON APR 28 2014

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

0446 PM     TSTM WND DMG     1 W LAURA               40.92N 89.94W
04/28/2014                   PEORIA             IL   TRAINED SPOTTER

            POWER POLES BLOWN DOWN WEST OF LAURA AND TRAIN CARS BLOWN
            OFF TRACKS.

0435 PM     TSTM WND DMG     ELMWOOD                 40.78N 89.97W
04/28/2014                   PEORIA             IL   TRAINED SPOTTER

            TREE LIMBS BLOWN DOWN AND ESTIMATED 60 MPH WINDS.

&&

EJL

Local storm report, Apr 28, 5:52 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
552 PM CDT MON APR 28 2014

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

0530 PM     TSTM WND DMG     3 E WASHBURN            40.92N 89.23W
04/28/2014                   WOODFORD           IL   EMERGENCY MNGR

            POWER POLE BLOWN DOWN ABOUT 3 MILES EAST OF WASHBURN.

&&

EJL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 2:29 PM CDT	Special Weather Statement	ILX	Peoria, Stark	61 min
Apr 28, 2:57 PM CDT	Special Weather Statement	ILX	Knox	63 min
Apr 28, 3:11 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan, Schuyler, Scott	49 min
Apr 28, 3:40 PM CDT	River Flood Warning	ILX	Clay, Richland	6 days
Apr 28, 4:02 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Fulton, Mason, Menard, Morgan, Schuyler	43 min
Apr 28, 4:16 PM CDT	Special Weather Statement	ILX	Morgan	44 min
Apr 28, 4:25 PM CDT	Severe Thunderstorm Warning	ILX	Knox	50 min
Apr 28, 4:59 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon, Sangamon, Shelby	61 min
Apr 28, 5:05 PM CDT	Severe Thunderstorm Warning	ILX	Knox, Marshall, Peoria, Stark	40 min
Apr 28, 6:32 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Coles, Douglas, Macon, Moultrie, Piatt and 1 more	43 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Every severe thunderstorm warning in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.