Alert archive / Iowa / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 258, NWS Des Moines, IA

August 18, 2014Palo Alto County, Pocahontas County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 18, 2014, 7:57 PM CDT for Palo Alto County, Pocahontas County, Iowa. It was in force for 48 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: Aug 18, 2014, 7:57 PM CDT (00:57 UTC)
Expired: Aug 18, 2014, 8:45 PM CDT
In force: 48 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Palo Alto County, IA, Pocahontas County, IA

The radar

The Des Moines radar (KDMX), 153 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.

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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 18, 7:44 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.0 hours before the alert went out and 229 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: 238 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1787 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

186 
WUUS53 KDMX 190057
SVRDMX
IAC147-151-190145-
/O.NEW.KDMX.SV.W.0258.140819T0057Z-140819T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
757 PM CDT MON AUG 18 2014

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN PALO ALTO COUNTY IN NORTHWEST IOWA...
  NORTHERN POCAHONTAS COUNTY IN NORTHWEST IOWA...

* UNTIL 845 PM CDT

* AT 756 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 6 MILES NORTHWEST
  OF SILVER LAKE...OR 9 MILES SOUTHEAST OF SPENCER...MOVING SOUTHEAST
  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...
  EMMETSBURG...POCAHONTAS...LAURENS...SILVER LAKE...RUSH LAKE...LOST
  ISLAND LAKE...WEST BEND...RUTHVEN...ROLFE...MALLARD...AYRSHIRE...
  HAVELOCK...PLOVER...CURLEW...RODMAN...EMMETSBURG MUNICIPAL AIRPORT
  AND POCAHONTAS MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4305 9444 4286 9444 4276 9451 4274 9471
      4289 9492 4317 9491
TIME...MOT...LOC 0056Z 296DEG 29KT 4309 9499 

HAIL...1.00IN
WIND...60MPH

$$

ZOGG

4 follow-up statements

080 
WWUS53 KDMX 190106
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
806 PM CDT MON AUG 18 2014

IAC147-151-190145-
/O.CON.KDMX.SV.W.0258.000000T0000Z-140819T0145Z/
PALO ALTO IA-POCAHONTAS IA-
806 PM CDT MON AUG 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTHERN PALO ALTO AND NORTHERN POCAHONTAS COUNTIES...

AT 806 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER SILVER LAKE...
OR 11 MILES WEST OF EMMETSBURG...MOVING SOUTHEAST AT 40 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...
EMMETSBURG...POCAHONTAS...LAURENS...SILVER LAKE...RUSH LAKE...LOST
ISLAND LAKE...WEST BEND...RUTHVEN...ROLFE...MALLARD...AYRSHIRE...
HAVELOCK...PLOVER...CURLEW...RODMAN...EMMETSBURG MUNICIPAL AIRPORT
AND POCAHONTAS MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4305 9444 4286 9444 4276 9451 4274 9471
      4289 9492 4317 9491
TIME...MOT...LOC 0106Z 297DEG 33KT 4305 9489 

HAIL...1.00IN
WIND...60MPH

$$

ZOGG

955 
WWUS53 KDMX 190116
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
816 PM CDT MON AUG 18 2014

IAC147-151-190145-
/O.CON.KDMX.SV.W.0258.000000T0000Z-140819T0145Z/
PALO ALTO IA-POCAHONTAS IA-
816 PM CDT MON AUG 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTHERN PALO ALTO AND NORTHERN POCAHONTAS COUNTIES...

AT 816 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES EAST OF
SILVER LAKE...OR 8 MILES SOUTHWEST OF EMMETSBURG...MOVING SOUTHEAST
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...
EMMETSBURG...POCAHONTAS...LAURENS...SILVER LAKE...RUSH LAKE...LOST
ISLAND LAKE...WEST BEND...RUTHVEN...ROLFE...MALLARD...AYRSHIRE...
HAVELOCK...PLOVER...CURLEW...RODMAN...EMMETSBURG MUNICIPAL AIRPORT
AND POCAHONTAS MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4305 9444 4286 9444 4276 9451 4274 9471
      4289 9492 4317 9491
TIME...MOT...LOC 0116Z 296DEG 29KT 4301 9479 

HAIL...1.00IN
WIND...60MPH

$$

ZOGG

291 
WWUS53 KDMX 190130
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
830 PM CDT MON AUG 18 2014

IAC147-151-190145-
/O.CON.KDMX.SV.W.0258.000000T0000Z-140819T0145Z/
PALO ALTO IA-POCAHONTAS IA-
830 PM CDT MON AUG 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTHEASTERN PALO ALTO AND NORTHEASTERN POCAHONTAS COUNTIES...

AT 830 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 10 MILES SOUTH OF
EMMETSBURG...MOVING SOUTHEAST 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...
WEST BEND...ROLFE...MALLARD...PLOVER AND RODMAN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4305 9444 4286 9444 4276 9451 4291 9475
      4301 9470 4308 9459
TIME...MOT...LOC 0130Z 296DEG 29KT 4296 9465 

HAIL...1.00IN
WIND...60MPH

$$

ZOGG

960 
WWUS53 KDMX 190144
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
844 PM CDT MON AUG 18 2014

IAC147-151-190154-
/O.EXP.KDMX.SV.W.0258.000000T0000Z-140819T0145Z/
PALO ALTO IA-POCAHONTAS IA-
844 PM CDT MON AUG 18 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PALO ALTO AND
NORTHEASTERN POCAHONTAS COUNTIES WILL EXPIRE AT 845 PM CDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
TUESDAY MORNING FOR NORTHERN IOWA.

LAT...LON 4305 9444 4286 9444 4276 9451 4291 9475
      4301 9470 4308 9459
TIME...MOT...LOC 0142Z 296DEG 29KT 4296 9465 

$$

ZOGG

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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 6:42 PM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, Aug 18, 6:42 PM CDT, 1 hour 15 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
642 PM CDT MON AUG 18 2014

.SHORT TERM /TONIGHT/...
ISSUED AT 311 PM CDT MON AUG 18 2014

COLD FRONT FROM NWRN MN THROUGH THE NEBRASKA PANHANDLE WILL MOVE
SOUTHEAST THROUGH THE CWA TONIGHT INTO TUE BEFORE STALLING OUT.
AIRMASS HAS BECOME UNSTABLE AHEAD OF THE FRONT WITH 2500 TO 3500
J/KG OF CAPE AVAILABLE IN AN UNCAPPED LOW SHEAR ENVIRONMENT.
THUNDERSTORMS ARE EXPECTED TO FOR RM A BROKEN LIKE AHEAD OF THE COLD
FRONT AND DROP SOUTHWARD ACROSS THE CWA...THOUGH WEAKENING AS IT MOVES
AWAY FROM THE DYNAMICS.  THERE IS SOME POTENTIAL FOR SEVERE WITH
ZERO TO 3 CAPE RUNNING NEAR 100 J/KG.  LCL IS FAIRLY HIGH LIMITING
THE CHANCE FOR TORNADIC DEVELOPMENT.  THOUGH HAIL IS POSSIBLE WITH
STRONGER STORMS...DEEP WARM CLOUD DEPTH WILL LIMIT THAT AS WELL.

.LONG TERM /TUESDAY THROUGH MONDAY/...
ISSUED AT 311 PM CDT MON AUG 18 2014

WEATHER PATTERN SETTING UP FOR EXTENDED WILL BE ACTIVE FOR IOWA
WITH VARYING CHANCES FOR THUNDERSTORMS. PATTERN WILL BE MARKED BY
HIGH PRESSURE SYSTEM ATTEMPTING TO PUSH NORTH INTO CENTRAL PLAINS
FROM GULF COAST REGION...WHILE UPPER LEVEL LOW PRESSURE SYSTEM
PUSHES EAST ACROSS CANADA...WITH IOWA GENERALLY IN BETWEEN THESE
TWO SYSTEMS. WITH HIGH AND RIDGE BUILDING INTO THE SOUTHERN
PLAINS...TEMPERATURES WILL WARM THROUGHOUT THE PERIOD...AND IF
RIDGE PUSHES FURTHER NORTH...WILL BE TOO LOW ON TEMPERATURES FOR
EXTENDED. HOWEVER...AS IS WILL SEE AN INCREASE IN HUMIDITY ACROSS
THE REGION...AND WITH HIGHER TEMPERATURES WILL SEE HEAT INDEX
VALUES IN THE MID TO UPPER 90S NEAR 100 ACROSS THE SOUTH THROUGH
THE WEEK. AS HIGH PUSHES NORTH...SURFACE LOW WILL PUSH
EAST...LIFTING NORTH ACROSS IOWA THROUGH THE DAY WEDNESDAY.
MODELS HAVE COME INTO BETTER AGREEMENT ON TIMING OF
SYSTEM...HOWEVER WITH DRY AIR PUSHING IN WITH HIGH...HAVE CUT BACK
ON PRECIPITATION CHANCES WEDNESDAY THOUGH STILL ANTICIPATE WIDELY
SCATTERED THUNDERSTORMS. IN ADDITION...INSTABILITY WILL BE QUITE
HIGH WITH LIMITED...THOUGH SUFFICIENT SHEAR...SO MAY HAVE CUT
BACK TOO AGGRESSIVELY. IN ADDITION...SYSTEM WILL NEED TO BE
WATCHED FOR CHANCES FOR SEVERE THUNDERSTORMS. ATTM...THREAT
APPEARS LOW.

LOW WILL CONTINUE TO LIFT NORTH WITH SECONDARY BOUNDARY PUSHING
ACROSS IOWA LATE THURSDAY. UPPER LOW WILL INCREASE IN STRENGTH AND
PUSH EASTWARD THROUGH THE END OF THE WORK WEEK..BEGINNING TO PUSH
HIGH FURTHER EAST...AND WILL SEE INCREASING PRECIPITATION
CHANCES. HOWEVER...MODELS ARE NOT IN GOOD AGREEMENT WITH TIMING
AND STRENGTH OF THIS SYSTEM. HAVE TRENDED TOWARDS THE GFS
ATTM...THOUGH THIS IS A SLIGHTLY MORE AGGRESSIVE SOLUTION. BEHIND
THIS SECONDARY LOW...WILL SEE COOLER TEMPERATURES AGAIN FOR VERY
END OF PERIOD.

&&

.AVIATION...19/00Z
ISSUED AT 642 PM CDT MON AUG 18 2014

MAINLY VFR CONDITIONS EXPECTED DURING THE NEXT 24 HOURS. SCT TSRA
WILL SPREAD ACROSS ABOUT THE NE HALF OF IOWA THIS EVE AND
TONIGHT AND HAVE INCLUDED VCTS IN ALL TERMINALS...HOWEVER SOME
STATIONS ESPECIALLY DSM/OTM HAVE A LOWER PROBABILITY AND EFFECTS
OF ANY STORMS WILL BE FOR BRIEF PERIODS ONLY. SOME BR ALSO
POSSIBLE AGAIN EARLY TUES MORNING...BUT ATTM BELIEVE IT WILL BE
ONLY MVFR AND FOR A COUPLE HOURS AROUND SUNRISE.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

SHORT TERM...MS
LONG TERM...AWB
AVIATION...LEE

Hazardous weather outlook, Aug 18, 6:44 PM CDT, 1 hour 13 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
644 PM CDT MON AUG 18 2014

IAZ004>007-015>017-023>028-033>039-044>050-057>062-072>075-192345-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE-
BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-
POWESHIEK-MADISON-WARREN-MARION-MAHASKA-
644 PM CDT MON AUG 18 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

SCATTERED SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING INTO THE
VERY EARLY MORNING HOURS. QUARTER SIZED HAIL AND 60 MPH WINDS ARE
THE PRIMARY THREATS. AN ISOLATED TORNADO IS POSSIBLE ALONG AND
WEST OF INTERSTATE 35. LOCALLY HEAVY RAINFALL IN EXCESS OF 2
INCHES IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ANOTHER ROUND OF THUNDERSTORMS IS ANTICIPATED WEDNESDAY NIGHT.
LOCALLY HEAVY RAINFALL WILL AGAIN BE POSSIBLE. INTERMITTENT
CHANCES FOR THUNDERSTORMS ARE FORECAST THURSDAY THROUGH SUNDAY. A
FEW SEVERE STORMS AND LOCALLY HEAVY RAINFALL ARE POSSIBLE DURING
THIS PERIOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED BETWEEN 7 PM THIS EVENING AND 1
AM TUESDAY.

IAZ070-071-081>086-092>097-192345-
CASS-ADAIR-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-
RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
644 PM CDT MON AUG 18 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

A FEW STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING
INTO THE VERY EARLY MORNING HOURS. QUARTER SIZED HAIL AND 60 MPH
WINDS ARE THE PRIMARY THREAT. LOCALLY HEAVY RAINFALL IN EXCESS OF
1 TO 2 INCHES IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ANOTHER ROUND OF THUNDERSTORMS IS ANTICIPATED WEDNESDAY NIGHT.
LOCALLY HEAVY RAINFALL WILL AGAIN BE POSSIBLE. INTERMITTENT
CHANCES FOR THUNDERSTORMS ARE FORECAST THURSDAY THROUGH SUNDAY. A
FEW SEVERE STORMS AND LOCALLY HEAVY RAINFALL ARE POSSIBLE DURING
THIS PERIOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED BETWEEN 7 PM THIS EVENING AND 1
AM TUESDAY.

ZOGG

In the hours before

Special weather statement, Aug 18, 6:23 PM CDT, 1 hour 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
623 PM CDT MON AUG 18 2014

IAZ004>007-015>017-023>025-033>035-190130-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-SAC-CALHOUN-WEBSTER-
INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...FOREST CITY...
LAKE MILLS...NORTHWOOD...MANLY...EMMETSBURG...GARNER...BRITT...
KANAWHA...MASON CITY...CLEAR LAKE...POCAHONTAS...LAURENS...
ROLFE...FONDA...GILMORE CITY...HUMBOLDT...EAGLE GROVE...CLARION...
BELMOND...SAC CITY...LAKE VIEW...ODEBOLT...WALL LAKE...SCHALLER...
EARLY...ROCKWELL CITY...MANSON...LAKE CITY...POMEROY...FORT DODGE
623 PM CDT MON AUG 18 2014

...STRONG TO SEVERE THUNDERSTORMS APPROACHING NORTH CENTRAL
IOWA...

AT 617 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED
STRONG TO SEVERE THUNDERSTORMS ACROSS NORTHWEST IOWA...MOVING
SOUTHEAST AT 30 MPH. AT THEIR CURRENT MOVEMENT...THEY WILL REACH
WESTERN PORTIONS OF EMMET...PALO ALTO AND POCAHONTAS COUNTIES BY
BETWEEN 730 PM AND 800 PM. ADDITIONAL THUNDERSTORMS IN EXTREME
SOUTHERN MINNESOTA MAY REACH NORTHERN PORTIONS OF
KOSSUTH...WINNEBAGO AND WORTH COUNTIES BY BETWEEN 700 PM AND 730
PM.

ANY OF THESE STORMS WILL BE CAPABLE OF PRODUCING HAIL UP TO THE
SIZE OF QUARTERS...AS WELL AS WINDS IN EXCESS OF 60 MPH.

ZOGG

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 7:43 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago, Worth	47 min
Aug 18, 10:15 PM CDT	Special Weather Statement	DMX	Cerro Gordo	30 min
Aug 18, 10:54 PM CDT	Special Weather Statement	DMX	Franklin, Wright	66 min
Aug 19, 12:12 AM CDT	Special Weather Statement	DMX	Black Hawk	63 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.