Alert archive / Iowa / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 86, NWS Des Moines, IA

May 10, 2014Madison County, Warren County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 10, 2014, 5:08 PM CDT for Madison County, Warren County, Iowa. It was in force for 52 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: May 10, 2014, 5:08 PM CDT (22:08 UTC)
Expired: May 10, 2014, 6:00 PM CDT
In force: 52 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Madison County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 41 km from the middle of the area, began a volume at 22:10 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
May 10, 5:10 PM CDT	HAIL 0.88	3 N Winterset, IA	TIME ESTIMATED FROM RADAR.

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

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

Omaha, NE (KOAX), launched 12:00Z, 10.1 hours before the alert went out and 208 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: 1818 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 406 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.

739 
WUUS53 KDMX 102208
SVRDMX
IAC121-181-102300-
/O.NEW.KDMX.SV.W.0086.140510T2208Z-140510T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
508 PM CDT SAT MAY 10 2014

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...
  NORTHEASTERN MADISON COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 600 PM CDT

* AT 508 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER WINTERSET...
  MOVING EAST AT 30 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...
  DES MOINES...WEST DES MOINES...INDIANOLA...NORWALK...WINTERSET...
  CARLISLE...AVENUE OF THE SAINTS EVENT CENTER...ST. CHARLES...
  MARTENSDALE...CUMMING...PATTERSON...ST. MARYS...BEVINGTON...SPRING
  HILL...LAKE AHQUABI STATE PARK...WINTERSET-MADISON COUNTY AIRPORT
  AND BADGER CREEK STATE PARK.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 52 AND 66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4133 9411 4149 9411 4151 9353 4125 9352
TIME...MOT...LOC 2208Z 271DEG 28KT 4138 9401 

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

$$

BEERENDS

3 follow-up statements

134 
WWUS53 KDMX 102226
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
526 PM CDT SAT MAY 10 2014

IAC121-181-102300-
/O.CON.KDMX.SV.W.0086.000000T0000Z-140510T2300Z/
WARREN IA-MADISON IA-
526 PM CDT SAT MAY 10 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHWESTERN WARREN AND NORTHEASTERN MADISON COUNTIES...

AT 526 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES NORTHWEST
OF AVENUE OF THE SAINTS EVENT CENTER...OR 9 MILES EAST OF
WINTERSET...MOVING EAST AT 30 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...
DES MOINES...WEST DES MOINES...INDIANOLA...NORWALK...CARLISLE...
MARTENSDALE...CUMMING...PATTERSON...ST. MARYS...BEVINGTON...SPRING
HILL...BADGER CREEK STATE PARK AND LAKE AHQUABI STATE PARK.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 54 AND 66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4134 9395 4150 9396 4151 9353 4128 9352
TIME...MOT...LOC 2226Z 266DEG 25KT 4140 9385 

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

$$

BEERENDS

170 
WWUS53 KDMX 102240
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
540 PM CDT SAT MAY 10 2014

IAC121-102250-
/O.CAN.KDMX.SV.W.0086.000000T0000Z-140510T2300Z/
MADISON IA-

540 PM CDT SAT MAY 10 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MADISON COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4134 9379 4150 9379 4151 9353 4132 9352
TIME...MOT...LOC 2240Z 266DEG 32KT 4141 9371 

$$

IAC181-102300-
/O.CON.KDMX.SV.W.0086.000000T0000Z-140510T2300Z/
WARREN IA-
540 PM CDT SAT MAY 10 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHWESTERN WARREN COUNTY...

AT 540 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR NORWALK...
MOVING EAST 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...
DES MOINES...WEST DES MOINES...INDIANOLA...NORWALK...CARLISLE...
MARTENSDALE...CUMMING...SPRING HILL AND BEVINGTON.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 56 AND 66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4134 9379 4150 9379 4151 9353 4132 9352
TIME...MOT...LOC 2240Z 266DEG 32KT 4141 9371 

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

$$

BEERENDS

389 
WWUS53 KDMX 102248
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
548 PM CDT SAT MAY 10 2014

IAC181-102258-
/O.CAN.KDMX.SV.W.0086.000000T0000Z-140510T2300Z/
WARREN IA-
548 PM CDT SAT MAY 10 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WARREN COUNTY IS
CANCELLED...
                
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 HAS BEEN CANCELLED.  HOWEVER SMALL HAIL AND
HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4134 9379 4150 9379 4151 9353 4132 9352
TIME...MOT...LOC 2247Z 271DEG 28KT 4141 9362 

$$

BEERENDS

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 May 10, 3:45 PM CDT, 1 hour 23 minutes earlier.

Area forecast discussion, May 10, 3:45 PM CDT, 1 hour 23 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
345 PM CDT SAT MAY 10 2014

...POTENTIALLY SIGNIFICANT SEVERE WEATHER OUTBREAK ON SUNDAY...

.SHORT TERM /TONIGHT/...
ISSUED AT 345 PM CDT SAT MAY 10 2014

ONGOING CONVECTION DEVELOPING AHEAD OF ADVANCE TROF AXIS IN EASTERN
NEBRASKA ALONG INSTABILITY AXIS. LARGE HAIL AND DAMAGING WINDS
PRIMARY THREAT WITH THESE THIS EVENING AS THEY MOVE TO EAST. LCL
AND CLOUD CEILINGS JUST A BIT HIGH STILL FOR MUCH OF A TORNADO
THREAT BUT THIS WILL BE CHANGING WITH TIME...SEE TOMORROW.
OTHERWISE...THE EVENING CONVECTION WILL MOVE TO THE EAST WITH
SHORT WITH THE SHORTWAVE AND IS EXPECTED TO EXIT THE FORECAST AREA
LATER THIS EVENING.

OVERNIGHT...STRONG LOW LEVEL JET WILL DEVELOP AHEAD OF STRENGTHENING
LOW IN WESTERN KANSAS. THIS WILL IMPACT UPON WARM FRONT LIFTING
NORTH THROUGH NORTHERN KANSAS AND MISSOURI WITH CONVECTION
SPREADING INTO SOUTHEAST NEBRASKA AND EVENTUALLY SOUTHWEST IOWA
TOWARD DAYBREAK. GIVEN THE INFLOW INTO THIS CONVECTIVE
SYSTEM...CERTAINLY THE POTENTIAL EXISTS FOR LARGE HAIL AS THE
STORMS MOVE INTO THE FORECAST AREA. HEAVY RAINS WILL ALSO BECOME A
THREAT WITH TIME BUT MOSTLY AFTER THIS PERIOD. HAVE GONE
CATEGORICAL IN THE FAR SOUTHWEST TOWARD DAYBREAK AS THIS SYSTEM
PUSHES INTO THE STATE ON STRONG WARM ADVECTION AND THETA-E
ADVECTION.

.LONG TERM /SUNDAY THROUGH SATURDAY/...
ISSUED AT 345 PM CDT SAT MAY 10 2014

ALL EYES ARE ON SUNDAY WHEN THERE IS A LIKELIHOOD OF SEVERE
WEATHER ACROSS MUCH OF THE FORECAST AREA. THIS POTENTIAL IS WELL
COVERED IN THE SPC OUTLOOK DISCUSSION AND READERS ARE ENCOURAGED
TO UTILIZE THAT RESOURCE AS IT IS UPDATED THROUGH TONIGHT AND INTO
TOMORROW. IN SHORT...BY SUNDAY MORNING AN ELONGATED SURFACE LOW
PRESSURE SYSTEM WILL STRETCH FROM AROUND THE OKLAHOMA PANHANDLE
NORTHEAST TOWARD IOWA WITH AN INVERTED TROUGH ALONG ITS AXIS.
ONGOING STORMS AROUND EASTERN NEBRASKA AND ALONG THE
IOWA/MISSOURI BORDER WILL COMPLICATE THE SITUATION...AND LIKELY
RESULT IN AN EFFECTIVE WARM FRONT STRETCHING ACROSS CENTRAL IOWA
BY SUNDAY AFTERNOON...CONNECTING TO A COLD FRONT RUNNING DOWN INTO
CENTRAL OR EASTERN KANSAS. SEVERE THUNDERSTORM POTENTIAL WILL BE
MAXIMIZED ALONG THIS EFFECTIVE WARM FRONT WITH VERY HIGH
INSTABILITY AND WIND SHEAR SUPPORTING SUPERCELLS AND POSSIBLY
MULTIPLE...STRONG TORNADOES. HOWEVER...THE DETAILS OF WHERE THIS
WARM FRONT LIES AND EXACTLY HOW MUCH DESTABILIZATION WILL OCCUR
WILL BE DEPENDENT ON THE EVOLUTION OF THE OVERNIGHT/MORNING STORMS
AND THUS THE THREAT IS SOMEWHAT CONDITIONAL. ALL RESIDENTS OF IOWA
SHOULD BE ON ALERT AND MONITOR THE LATEST WEATHER INFORMATION
CLOSELY TONIGHT AND SUNDAY INTO SUNDAY NIGHT.

BY MONDAY MORNING THE SURFACE LOW PRESSURE SYSTEM WILL BE MOVING
OFF TO THE NORTHEAST...BUT IT WILL TRAIL A COLD FRONT THAT WILL
LINGER ACROSS AREAS OF IOWA ROUGHLY EAST OF INTERSTATE 35 ON
MONDAY AFTERNOON WITH ADDITIONAL DEVELOPMENT AND SEVERE WEATHER
ONCE AGAIN POSSIBLE INTO MONDAY EVENING. THE THREAT IS SOMEWHAT
LOWER DURING THIS TIME FRAME AS INSOLATION AND INSTABILITY WILL BE
MORE LIMITED DUE TO CONVECTIVE DEBRIS CLOUDS...BUT CERTAINLY THERE
WILL STILL BE AT LEAST SOME THREAT FOR WIND AND HAIL.

THE COLD FRONT WILL SWEEP EAST OF OUR FORECAST AREA ON MONDAY
NIGHT...ENDING THE THUNDERSTORM AND SEVERE WEATHER THREAT AND
USHERING IN COOLER AND MOSTLY DRY WEATHER FOR THE REMAINDER OF THE
WEEK. THERE WILL BE INTERMITTENT CHANCES FOR LIGHT SHOWERS BUT
NOTHING APPRECIABLE IS ON THE HORIZON. DAILY HIGH TEMPERATURES
FROM TUESDAY THROUGH NEXT SATURDAY WILL GENERALLY RANGE ONLY IN
THE MID 50S TO MID 60S.

&&

.AVIATION...10/18Z
ISSUED AT 1242 PM CDT SAT MAY 10 2014

SHORTWAVE MOVING ACRS THIS AFTERNOON AND THIS EVENING WILL PRODUCE
SCATTERED SHOWERS AND THUNDERSTORMS. CEILINGS WILL GENERALLY BE
VFR THROUGH THE AFTERNOON AND EVENING HOURS ALTHOUGH MAY BE MVFR
TO IFR IN AND AROUND THUNDERSTORMS. SURFACE WINDS WILL BE FROM THE
SOUTHEAST AND GUSTY FROM TIME TO TIME. OVERNIGHT...ANTICIPATE
WIDESPREAD VFR CONDITIONS FOR MOST LOCATIONS BUT CONVECTION IS
EXPECTED TO EASE INTO SOUTHERN IOWA TOWARD DAYBREAK WITH
INCREASING LOW CIGS AND VSBYS. THIS WILL SLOWLY WORK INTO CENTRAL
IOWA ON SUNDAY MORNING AS CONVECTION SPREADS NORTHEAST INTO THE
STATE.

&&

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

&&

SHORT TERM...COGIL
LONG TERM...LEE
AVIATION...COGIL

Hazardous weather outlook, May 10, 2:57 PM CDT, 2 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
257 PM CDT SAT MAY 10 2014

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-111100-
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-CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION-
CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-
APPANOOSE-DAVIS-
257 PM CDT SAT MAY 10 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A POTENTIAL FOR SEVERE THUNDERSTORMS FROM THIS AFTERNOON
INTO TONIGHT...GENERALLY SOUTH OF INTERSTATE 80. LARGE HAIL AND
DAMAGING WINDS ARE THE MAIN THREATS. FURTHER NORTH...ISOLATED
STRONG TO POTENTIALLY SEVERE THUNDERSTORMS ARE POSSIBLE BUT THE
OVERALL THREAT IS LOWER.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS THE POTENTIAL FOR A SIGNIFICANT SEVERE WEATHER OUTBREAK
ON SUNDAY AFTERNOON AND EVENING...WITH A POSSIBILITY FOR MULTIPLE
STRONG TORNADOES. THIS IS A POTENTIALLY DANGEROUS SITUATION.
SEVERE WEATHER IS POSSIBLE AGAIN ON MONDAY AFTERNOON AND
EVENING...MAINLY EAST OF INTERSTATE 35...WHERE THE PRIMARY THREATS
WILL BE LARGE HAIL AND STRONG WINDS. HEAVY RAIN IS ALSO
ANTICIPATED FROM SUNDAY AFTERNOON THROUGH MONDAY AND MAY LEAD TO
LOCALIZED AREAS OF FLASH FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON AND EVENING...AND
WILL LIKELY BE NEEDED SUNDAY INTO SUNDAY NIGHT...AND POSSIBLY
AGAIN ON MONDAY.

LEE

In the hours before

Local storm report, May 10, 3:39 PM CDT, 1 hour 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
339 PM CDT SAT MAY 10 2014

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

0337 PM     HAIL             1 NW GRAVITY            40.77N 94.76W
05/10/2014  E1.00 INCH       TAYLOR             IA   TRAINED SPOTTER

&&

CCOGIL

Local storm report, May 10, 4:23 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
423 PM CDT SAT MAY 10 2014

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

0421 PM     HAIL             3 N GREENFIELD          41.35N 94.45W
05/10/2014  M1.00 INCH       ADAIR              IA   EMERGENCY MANAGER

&&

NWS DES MOINES IA
IRIS SYSTEM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 3:02 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	43 min
May 10, 3:28 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	47 min
May 10, 3:38 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford	52 min
May 10, 3:41 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	49 min
May 10, 3:51 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun	39 min
May 10, 4:05 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Ringgold, Taylor, Union	40 min
May 10, 4:26 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Madison	49 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.