Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 177, NWS Sioux Falls, SD

July 25, 2012Clay County, Dickinson County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 25, 2012, 6:03 PM CDT for Clay County, Dickinson County, Iowa. It was in force for 42 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: Jul 25, 2012, 6:03 PM CDT (23:03 UTC)
Expired: Jul 25, 2012, 6:45 PM CDT
In force: 42 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Clay County, IA, Dickinson County, IA

What was reported inside it

Time	Report	Where	Remark
Jul 25, 6:07 PM CDT	HAIL 1.25	2 E Terril, IA

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.

Issued	Product	Office	Lasted
Jul 25, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.1 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: 1629 J/kg
Mixed-layer CIN: -285 J/kg
Mixed-layer LCL: 1524 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 421 m²/s²
0-3 km storm-relative helicity: 458 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

452 
WUUS53 KFSD 252303
SVRFSD
IAC041-059-252345-
/O.NEW.KFSD.SV.W.0177.120725T2303Z-120725T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
603 PM CDT WED JUL 25 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CLAY COUNTY IN NORTHWEST IOWA...
  EASTERN DICKINSON COUNTY IN NORTHWEST IOWA...

* UNTIL 645 PM CDT

* AT 603 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING WALNUT SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR TERRIL...OR 11 MILES SOUTHEAST OF SPIRIT LAKE...AND
  MOVING EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF EASTERN
  DICKINSON AND NORTHEASTERN CLAY COUNTIES.

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 4314 9492 4318 9523 4350 9501 4349 9490
      4314 9491
TIME...MOT...LOC 2303Z 286DEG 15KT 4330 9498
WIND...HAIL 60MPH 1.50IN

$$

CHENARD

2 follow-up statements

951 
WWUS53 KFSD 252319
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
619 PM CDT WED JUL 25 2012

IAC041-059-252345-
/O.CON.KFSD.SV.W.0177.000000T0000Z-120725T2345Z/
DICKINSON IA-CLAY IA-
619 PM CDT WED JUL 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
CLAY AND SOUTHEASTERN DICKINSON COUNTIES UNTIL 645 PM CDT...

AT 619 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING WALNUT SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
TERRIL...OR 13 MILES NORTHEAST OF SPENCER...MOVING EAST AT 15 MPH.

IN ADDITION...WALNUT SIZE HAIL WAS RECENTLY REPORTED NEAR TERRIL 
WITH THIS STORM.

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 4314 9492 4316 9508 4338 9498 4336 9490
      4314 9491
TIME...MOT...LOC 2319Z 286DEG 15KT 4325 9492
WIND...HAIL 60MPH 1.50IN

$$

CHENARD

656 
WWUS53 KFSD 252340
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
640 PM CDT WED JUL 25 2012

IAC041-059-252350-
/O.EXP.KFSD.SV.W.0177.000000T0000Z-120725T2345Z/
DICKINSON IA-CLAY IA-
640 PM CDT WED JUL 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLAY AND
SOUTHEASTERN DICKINSON COUNTIES WILL EXPIRE AT 645 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4314 9492 4316 9508 4338 9498 4336 9490
      4314 9491
TIME...MOT...LOC 2340Z 286DEG 15KT 4323 9480

$$

SCHUMACHER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 5:11 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	34 min
Jul 25, 5:15 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	39 min
Jul 25, 5:16 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	29 min
Jul 25, 5:25 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien	35 min
Jul 25, 5:31 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	59 min
Jul 25, 5:43 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	47 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2012 Every 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.