Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 50, NWS Sioux Falls, SD

July 19, 2008Lyon County, Sioux County, Iowa; Lincoln County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 19, 2008, 3:15 PM CDT for Lyon County, Sioux County, Iowa; Lincoln County, South Dakota. It was in force for 30 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 19, 2008, 3:15 PM CDT (20:15 UTC)
Expired: Jul 19, 2008, 3:45 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Lyon County, IA, Sioux County, IA, Lincoln County, SD

The radar

The Sioux Falls radar (KFSD), 29 km from the middle of the area, began a volume at 20:14 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
Jul 19, 3:30 PM CDT	HAIL 1	Harrisburg, SD	IN ADDITION TO QUARTER SIZED HAIL, SOME STREET FLOODING WAS REPORTED IN THE NORTHERN PART OF HARRISBURG.

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 19, 2:28 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.3 hours before the alert went out and 224 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: 10 J/kg
Mixed-layer CIN: -341 J/kg
Mixed-layer LCL: 1445 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 108 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.

000 
WFUS53 KFSD 192015
TORFSD
IAC119-167-SDC083-192045-
/O.NEW.KFSD.TO.W.0050.080719T2015Z-080719T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
315 PM CDT SAT JUL 19 2008

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTHWESTERN LYON COUNTY IN NORTHWEST IOWA
  EXTREME NORTHWESTERN SIOUX COUNTY IN NORTHWEST IOWA
  NORTHERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 345 PM CDT

* AT 315 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES
  NORTHWEST OF WORTHING...OR 12 MILES SOUTH OF SIOUX FALLS...MOVING
  SOUTHEAST AT 27 MPH.

* THE TORNADO WILL BE NEAR...
   CANTON AROUND 335 PM CDT...

TAKE COVER NOW. IF YOU WAIT TO SEE OR HEAR IT COMING...IT MAY BE TOO 
LATE TO GET TO A SAFE PLACE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SATURDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEAST SOUTH DAKOTA.

LAT...LON 4336 9646 4318 9659 4332 9690 4346 9677
TIME...MOT...LOC 2015Z 302DEG 24KT 4336 9675

$$

MJF

2 follow-up statements

000 
WWUS53 KFSD 192028
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
327 PM CDT SAT JUL 19 2008

IAC119-167-SDC083-192045-
/O.CON.KFSD.TO.W.0050.000000T0000Z-080719T2045Z/
LYON IA-SIOUX IA-LINCOLN SD-
327 PM CDT SAT JUL 19 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM CDT FOR NORTHERN 
LINCOLN...EXTREME NORTHWESTERN SIOUX AND EXTREME SOUTHWESTERN LYON 
COUNTIES...

AT 327 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A TORNADO. THIS TORNADO WAS LOCATED 4 MILES EAST OF 
WORTHING...MOVING SOUTHEAST AT 28 MPH.

THE TORNADO WILL BE NEAR...
   CANTON AROUND 335 PM CDT...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUARTER SIZED HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS OF 60 TO 70 
MPH.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SATURDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEAST SOUTH DAKOTA.

LAT...LON 4336 9646 4318 9659 4332 9690 4346 9677
TIME...MOT...LOC 2027Z 302DEG 24KT 4333 9666

$$

MJF

000 
WWUS53 KFSD 192044
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
343 PM CDT SAT JUL 19 2008

MNC063-192100-
/O.CON.KFSD.SV.W.0199.000000T0000Z-080719T2100Z/
JACKSON MN-
343 PM CDT SAT JUL 19 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR EASTERN JACKSON COUNTY...

AT 343 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 3 MILES NORTH OF
JACKSON...OR NEAR JACKSON...MOVING SOUTHEAST AT 23 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
   ALPHA AROUND 355 PM CDT...

DAMAGING WINDS UP TO 60 MPH WERE REPORTED 5 MILES NORTH OF JACKSON 
AT 330 PM CDT WITH THIS STORM. THIS IS A DANGEROUS STORM...SEEK SAFE 
SHELTER AND STAY AWAY FROM WINDOWS

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SATURDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEAST SOUTH DAKOTA.

LAT...LON 4375 9486 4350 9486 4350 9491 4369 9525
      4383 9513
TIME...MOT...LOC 2043Z 304DEG 20KT 4366 9497

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 2:31 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	44 min
Jul 19, 3:40 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	50 min
Jul 19, 3:52 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	38 min
Jul 19, 4:12 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola, Sioux	48 min
Jul 19, 4:42 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Dickinson, O'Brien, Osceola	33 min
Jul 19, 4:47 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	43 min
Jul 19, 1:32 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Beadle, Brule, Jerauld	56 min
Jul 19, 2:22 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	23 min
Jul 19, 2:42 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Lincoln, McCook, Minnehaha, Turner	33 min
Jul 19, 4:05 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner, Union, Yankton	40 min

Nearby

Tornado Warnings in Iowa, 2008 Tornado Warnings in South Dakota, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.