Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 104, NWS Sioux Falls, SD

May 19, 20124 counties in Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 19, 2012, 7:56 PM CDT for 4 counties in Iowa. It was in force for 38 min. 2 reports 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 19, 2012, 7:56 PM CDT (00:56 UTC)
Expired
May 19, 2012, 8:34 PM CDT
In force
38 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Cherokee County, IA, Ida County, IA, Plymouth County, IA, Woodbury County, IA

The radar

The Omaha radar (KOAX), 136 km from the middle of the area, began a volume at 00:57 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

TimeReportWhereRemark
May 19, 8:00 PM CDTHAIL 0.755 Wsw Anthon, IAALSO RECEIVED 1 INCH OF RAIN
May 19, 8:00 PM CDTHAIL 14 W Anthon, IAMOSTLY SMALL HAIL...BUT A FEW STONES TO SIZE OF QUARTERS

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

The watch it was issued in

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

IssuedProductOfficeLasted
May 19, 6:52 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.9 hours before the alert went out and 136 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2012-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1597 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2012-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.193958Sfc1 km3 km6 kmRMLM
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
1597 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1383 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.8
Supercell composite
8.3

Open this sounding in Storm Lab

The text

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

423 
WUUS53 KFSD 200056
SVRFSD
IAC035-093-149-193-200145-
/O.NEW.KFSD.SV.W.0104.120520T0056Z-120520T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
756 PM CDT SAT MAY 19 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CHEROKEE COUNTY IN NORTHWEST IOWA...
  EXTREME NORTHWESTERN IDA COUNTY IN WEST CENTRAL IOWA...
  SOUTHEASTERN PLYMOUTH COUNTY IN NORTHWEST IOWA...
  EASTERN WOODBURY COUNTY IN WEST CENTRAL IOWA...

* UNTIL 845 PM CDT

* AT 756 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR
  SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR ANTHON...OR 23 MILES WEST OF IDA GROVE...AND MOVING
  NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOVILLE AROUND 810 PM CDT...
  CORRECTIONVILLE AROUND 815 PM CDT...
  PIERSON AROUND 825 PM CDT...
  KINGSLEY AND WASHTA AROUND 830 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4269 9609 4267 9568 4222 9570 4222 9614
TIME...MOT...LOC 0056Z 187DEG 23KT 4237 9592
WIND...HAIL 60MPH 1.25IN

$$
MJF
2 follow-up statements
901 
WWUS53 KFSD 200118
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
818 PM CDT SAT MAY 19 2012

IAC035-093-149-193-200145-
/O.CON.KFSD.SV.W.0104.000000T0000Z-120520T0145Z/
PLYMOUTH IA-IDA IA-CHEROKEE IA-WOODBURY IA-
818 PM CDT SAT MAY 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
WOODBURY...SOUTHWESTERN CHEROKEE...EXTREME NORTHWESTERN IDA AND
SOUTHEASTERN PLYMOUTH COUNTIES UNTIL 845 PM CDT...

AT 818 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
CORRECTIONVILLE...OR 22 MILES WEST OF IDA GROVE...MOVING NORTH AT 25
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PIERSON AROUND 830 PM CDT...
  WASHTA AND KINGSLEY AROUND 835 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4269 9609 4267 9568 4222 9570 4222 9614
TIME...MOT...LOC 0118Z 191DEG 21KT 4248 9587
WIND...HAIL 60MPH 1.00IN

$$

MJF
410 
WWUS53 KFSD 200134
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
834 PM CDT SAT MAY 19 2012

IAC035-093-149-193-200144-
/O.CAN.KFSD.SV.W.0104.000000T0000Z-120520T0145Z/
PLYMOUTH IA-IDA IA-CHEROKEE IA-WOODBURY IA-
834 PM CDT SAT MAY 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WOODBURY...
SOUTHWESTERN CHEROKEE...EXTREME NORTHWESTERN IDA AND SOUTHEASTERN
PLYMOUTH COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. SMALL HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH THESE  
THUNDERSTORM.

LAT...LON 4269 9609 4267 9568 4222 9570 4222 9614
TIME...MOT...LOC 0134Z 191DEG 21KT 4257 9585

$$

MJF

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 9:09 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida, Plymouth, Woodbury51 min
May 19, 9:38 PM CDTSevere Thunderstorm WarningFSDBuena Vista, Cherokee, Clay, O'Brien, Plymouth37 min
May 19, 10:11 PM CDTFlash Flood WarningFSDClay, Dickinson, O'Brien3 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2012Every severe thunderstorm warning in 2012

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.