Alert archive / Iowa / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 81, NWS Sioux Falls, SD

June 13, 20177 counties in Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 13, 2017, 10:15 PM CDT for 7 counties in Iowa. It was in force for 45 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: Jun 13, 2017, 10:15 PM CDT (03:15 UTC)
Expired: Jun 13, 2017, 11:00 PM CDT
In force: 45 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, O'Brien County, IA, Osceola County, IA

The radar

The Sioux Falls radar (KFSD), 139 km from the middle of the area, began a volume at 03:19 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
Jun 13, 7:01 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.3 hours before the alert went out and 188 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: 3011 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1474 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 222 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 21.5

Open this sounding in Storm Lab

The text

As transmitted.

900 
WUUS53 KFSD 140315
SVRFSD
IAC021-035-041-059-093-141-143-140400-
/O.NEW.KFSD.SV.W.0081.170614T0315Z-170614T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1015 PM CDT TUE JUN 13 2017

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Eastern Cherokee County in northwestern Iowa...
  Eastern Osceola County in northwestern Iowa...
  Dickinson County in northwestern Iowa...
  Buena Vista County in northwestern Iowa...
  Clay County in northwestern Iowa...
  Eastern O'Brien County in northwestern Iowa...
  Ida County in west central Iowa...

* Until 1100 PM CDT

* At 1015 PM CDT, severe thunderstorms were located along a line
  extending from near Sanborn to 6 miles northeast of Aurelia to near
  Arthur, moving east at 50 mph.

  HAZARD...70 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Severe thunderstorms will be near, 
  Linn Grove and Truesdale around 1025 PM CDT. 
  Sioux Rapids around 1030 PM CDT. 
  Everly around 1035 PM CDT. 
  Albert City and Marathon around 1040 PM CDT. 
  Spencer In Clay County and Fostoria around 1045 PM CDT. 
  Terril and Lost Island Lake around 1100 PM CDT. 

Other locations impacted by these severe thunderstorms include
Moneta, Dickens, Calumet, Rossie, Gillett Grove, Meriden and
Rembrandt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 200 AM CDT for northwestern
and west central Iowa.

LAT...LON 4324 9564 4326 9539 4350 9540 4350 9491
      4256 9491 4256 9539 4248 9539 4247 9532
      4221 9532 4221 9567
TIME...MOT...LOC 0315Z 260DEG 43KT 4315 9565 4278 9533 4227 9538 

HAIL...0.75IN
WIND...70MPH
 
$$

Weisser

3 follow-up statements

377 
WWUS53 KFSD 140329
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1029 PM CDT TUE JUN 13 2017

IAC021-035-041-059-093-141-143-140400-
/O.CON.KFSD.SV.W.0081.000000T0000Z-170614T0400Z/
Cherokee IA-Osceola IA-Dickinson IA-Buena Vista IA-Clay IA-
O'Brien IA-Ida IA-
1029 PM CDT TUE JUN 13 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR EASTERN CHEROKEE...EASTERN OSCEOLA...DICKINSON...BUENA VISTA...
CLAY...EASTERN O'BRIEN AND IDA COUNTIES...

At 1028 PM CDT, severe thunderstorms were located along a line
extending from near Hartley to near Sioux Rapids to near Odebolt,
moving northeast at 45 mph.

HAZARD...70 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

These severe storms will be near...
  Sioux Rapids and Albert City around 1035 PM CDT. 
  Marathon and Webb around 1040 PM CDT. 
  Fostoria around 1045 PM CDT. 
  Milford, Wahpeton and West Okoboji around 1050 PM CDT. 
  Arnolds Park and Okoboji around 1055 PM CDT. 
  Spirit Lake, Orleans, Terril and Superior around 1100 PM CDT. 

Other locations impacted by these severe thunderstorms include
Moneta, Dickens, Calumet, Rossie, Gillett Grove, Meriden and
Rembrandt.

Locations from the Iowa Great Lakes south through Spencer may see 
the strong winds with little lightning or rain as the strong winds 
have surged ahead of the main area of storms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 200 AM CDT for northwestern
and west central Iowa.

LAT...LON 4324 9564 4326 9539 4350 9540 4350 9491
      4256 9491 4256 9539 4248 9539 4247 9532
      4221 9532 4221 9567
TIME...MOT...LOC 0328Z 239DEG 40KT 4322 9544 4285 9513 4234 9518 

HAIL...0.75IN
WIND...70MPH
 
$$

Weisser

277 
WWUS53 KFSD 140340
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1040 PM CDT TUE JUN 13 2017

IAC035-093-141-140349-
/O.CAN.KFSD.SV.W.0081.000000T0000Z-170614T0400Z/
Cherokee IA-O'Brien IA-Ida IA-
1040 PM CDT TUE JUN 13 2017

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CHEROKEE...EASTERN
O'BRIEN AND IDA COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 200 AM CDT for northwestern
and west central Iowa.

LAT...LON 4256 9539 4325 9539 4326 9544 4326 9539
      4350 9540 4350 9491 4256 9492
TIME...MOT...LOC 0339Z 270DEG 43KT 4324 9526 4287 9495 4236 9500 

$$

IAC021-041-059-143-140400-
/O.CON.KFSD.SV.W.0081.000000T0000Z-170614T0400Z/
Osceola IA-Dickinson IA-Buena Vista IA-Clay IA-
1040 PM CDT TUE JUN 13 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR EASTERN OSCEOLA...DICKINSON...BUENA VISTA AND CLAY COUNTIES...

At 1039 PM CDT, severe thunderstorms were located along a line
extending from near Fostoria to Marathon to near Sac City, moving
east at 50 mph.

HAZARD...70 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

These severe storms will be near...
  Albert City around 1045 PM CDT. 
  Terril around 1100 PM CDT. 

Other locations impacted by these severe thunderstorms include
Gillett Grove, Dickens, Rossie and Rembrandt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 200 AM CDT for northwestern
and west central Iowa.

LAT...LON 4256 9539 4325 9539 4326 9544 4326 9539
      4350 9540 4350 9491 4256 9492
TIME...MOT...LOC 0339Z 270DEG 43KT 4324 9526 4287 9495 4236 9500 

HAIL...0.75IN
WIND...70MPH
 
$$

Weisser

679 
WWUS53 KFSD 140402
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1102 PM CDT TUE JUN 13 2017

IAC021-041-059-143-140412-
/O.EXP.KFSD.SV.W.0081.000000T0000Z-170614T0400Z/
Osceola IA-Dickinson IA-Buena Vista IA-Clay IA-
1102 PM CDT TUE JUN 13 2017

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN OSCEOLA...DICKINSON...
BUENA VISTA AND CLAY COUNTIES HAS EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning has been allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A tornado watch remains in effect until 200 AM CDT for northwestern
and west central Iowa.

LAT...LON 4256 9539 4325 9539 4326 9544 4326 9539
      4350 9540 4350 9491 4256 9492
TIME...MOT...LOC 0402Z 260DEG 43KT 4329 9491 4291 9460 4241 9465 

$$

Weisser

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 13, 3:04 PM CDT, 7 hours 11 minutes earlier.

Area forecast discussion, Jun 13, 3:04 PM CDT, 7 hours 11 minutes before

Area Forecast Discussion
National Weather Service Sioux Falls SD
304 PM CDT Tue Jun 13 2017

.SHORT TERM...(This evening through Wednesday)
Issued at 303 PM CDT Tue Jun 13 2017

Current analysis shows a surface low centered over central Nebraska,
with a trough axis/subtle cold front extending northward into
central SD. A warm front is attendant to the surface trough
positioned north of our forecast area where winds turn to the
east/southeast, compared with south to southeast in our area. Aloft,
water vapor imagery clearly shows two vorticity maxima, one located
with the parent upper low in southwest MT, with a secondary maximum
developing right now in southeast WY.

The southeast WY vort max will rotate northeastward into central and
southeast SD by 03Z this evening, then becomes rather sheared off as
it lifts northeastward in southwest MN between 03Z and 06Z. However
another short wave moves into zones just south of our forecast area
after midnight tonight. Speed shear is strong with this short wave,
averaging 40 knots really across the entire forecast area through
the overnight hours. However, directional shear is rather weak.
Therefore thoughts are that discrete cells may develop along the
wind shift and ahead of the drier air in our western zones, from
Huron and Mitchell westward late this afternoon, then morph into a
line of convection as it moves eastward along and east of the James
River valley. ML CAPES are extremely high denoting high instability,
in the range of 2000 to 4000 J/kg this evening, before decreasing
between 03Z and 06Z. Therefore golfball to isolated baseball sized
hail is possible in our western zones during the early evening, with
the threat transitioning to 60 to 70 mph winds between the I 29
corridor and the James River with quarter to walnut sized hail
during the mid evening hours. As it moves eastward into southwest MN
after mid evening and overnight, the primary threat is still the 60
to 70 mph wind potential. Further south in extreme northeast
Nebraska and northwest IA, this area will likely not receive any
discrete cells whatsoever, with the secondary short wave mentioned
above keeping that area rather stirred up all the way through 09Z.
But likewise, the severe weather threat is most prominent in the
evening hours. In fact, 0-3km bulk shear vectors bend to a west/
southwest direction in northwest IA during the mid and late evening
hours suggesting a bow echo, or at the least some bow segments. This
is not the case in the rest of our forecast area, as the 0-3km bulk
shear vectors have a decided south to southwest tilt to them,
suggesting that widespread strong wind is not likely. But the
stronger rotating updrafts in northwest IA could certainly carry
some 60-80mph winds in the mid and late evening, with brief possible
spin up tornadoes, which may be hard to tell the difference between
those and 80 mph winds at any rate.

Things will quiet down after 06Z rather rapidly as the short wave
currently in southwest WY exits. A surface wind shift will follow
suit providing a pleasant day on Wednesday with a dry westerly flow
of air and stable conditions.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 303 PM CDT Tue Jun 13 2017

Much more tranquil pattern expected in the extended with westerly
flow expected for the next several day as upper level low pressure
system works towards and eventually north of the Great Lakes. This
will result in dry conditions though temperatures will remain above
normal with 850 hpa temps remaining in the upper teens.

Surface low will track across the area Friday night creating the
chance for showers and storms mainly east of the James River Valley.
Limited amounts of Gulf moisture appear to work north ahead of this
system, thus limiting the amount of instability.

Fairly strong cold front is expected to work through the region on
Saturday afternoon leading to an additional chance of thunderstorms.
Cooler conditions are expected to reign Sunday through Tuesday with
dry conditions.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 1226 PM CDT Tue Jun 13 2017

The challenge today are strong thunderstorms. A disturbance will
be moving through this evening and overnight ahead of a surface
wind shift. Timing in the TAFs has been refined to a slightly
later arrival of TSRA for the TAF sites to reflect a degree of
capping which is in place through much of the afternoon hours. At
any given time during the TSRA threat time, some storms could be
severe with large hail and strong erratic winds. In addition,
conditions could be IFR in periods of heavy rainfall. This is
something for the aviation community to keep an eye on. Toward
daybreak Wednesday and into mid morning, indications are there
could be some temporary MVFR ceilings which is common after
rainfall and ahead of the wind shift.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
IA...None.
NE...None.
&&

SHORT TERM...MJ
LONG TERM...BT
AVIATION...MJ

Hazardous weather outlook, Jun 13, 4:49 AM CDT, 17 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
449 AM CDT Tue Jun 13 2017

IAZ001-012-020-MNZ071-097-098-NEZ013-014-SDZ038>040-053>056-
059>062-065>071-141000-
Lyon IA-Sioux-Plymouth-Lincoln MN-Pipestone-Rock-Dixon-Dakota-
Beadle-Kingsbury-Brookings-Sanborn-Miner-Lake-Moody-Davison-
Hanson-McCook-Minnehaha-Hutchinson-Turner-Lincoln SD-Bon Homme-
Yankton-Clay SD-Union-
449 AM CDT Tue Jun 13 2017

This Hazardous Weather Outlook is for portions of northwest Iowa,
southwest Minnesota, northeast Nebraska, east central South
Dakota, and southeast South Dakota.

.DAY ONE...Today and Tonight

An increasing severe weather threat is expected today, with
numerous severe storms likely developing this afternoon and
evening along and east of the James River. The main risks are
large hail up to baseball size, and damaging winds to 70 mph.
Isolated tornadoes cannot be ruled out with some of these storms.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely after 3 pm.

IAZ002-003-013-014-021-022-031-032-MNZ072-080-081-089-090-141000-
Osceola-Dickinson-O'Brien-Clay IA-Cherokee-Buena Vista-Woodbury-
Ida-Lyon MN-Murray-Cottonwood-Nobles-Jackson-
449 AM CDT Tue Jun 13 2017

This Hazardous Weather Outlook is for portions of northwest Iowa,
west central Iowa, and southwest Minnesota.

.DAY ONE...Today and Tonight

An increasing severe weather threat is expected today, with
scattered strong to severe storms likely developing late this
afternoon and evening. The main impact will be damaging winds to
70 mph, and large hail up to golf ball size.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely after 6 pm.

SDZ050-052-057-058-063-064-141000-
Gregory-Jerauld-Brule-Aurora-Charles Mix-Douglas-
449 AM CDT Tue Jun 13 2017

This Hazardous Weather Outlook is for portions of central South
Dakota and south central South Dakota.

.DAY ONE...Today and Tonight

There is a chance of thunderstorms across the area this afternoon.
Isolated strong storms will be possible, producing large hail up
to quarter size, and strong gusty winds.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Local storm report, Jun 13, 9:48 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
948 PM CDT TUE JUN 13 2017

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

0945 PM     TSTM WND GST     1 WSW BEAVER CREEK      43.61N 96.38W
06/13/2017  M62 MPH          ROCK               MN   MESONET

            GUST VIA BEAVER CREEK MNDOT RWIS.

&&

AF

Local storm report, Jun 13, 9:49 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
949 PM CDT TUE JUN 13 2017

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

0618 PM     TSTM WND DMG     7 NNE HURON             44.46N 98.18W
06/13/2017                   BEADLE             SD   PUBLIC

            BLEW OFF PREVIOUSLY DAMAGED BARN ROOF. TIME
            ESTIMATED FROM RADAR.

&&

AF

Local storm report, Jun 13, 9:50 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
950 PM CDT TUE JUN 13 2017

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

0910 PM     TSTM WND DMG     3 W SIOUX FALLS         43.54N 96.79W
06/13/2017                   MINNEHAHA          SD   EMERGENCY MNGR

            ROOF TORN OFF OF MOBILE HOME.

&&

TH

Local storm report, Jun 13, 10:02 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1002 PM CDT TUE JUN 13 2017

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

0943 PM     TSTM WND DMG     REMSEN                  42.81N 95.97W
06/13/2017                   PLYMOUTH           IA   LAW ENFORCEMENT

            TREES DOWN IN REMSEN. RELAYED VIA TRAINED
            SPOTTER ON SOCIAL MEDIA. TIME ESTIMATED FROM
            RADAR.

&&

AF

Local storm report, Jun 13, 10:03 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1003 PM CDT TUE JUN 13 2017

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

0934 PM     TSTM WND DMG     LE MARS                 42.79N 96.17W
06/13/2017                   PLYMOUTH           IA   LAW ENFORCEMENT

            TREES DOWN IN LE MARS. RELAYED VIA TRAINED
            SPOTTER ON SOCIAL MEDIA. TIME ESTIMATED FROM
            RADAR.

&&

AF

Local storm report, Jun 13, 10:14 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1014 PM CDT TUE JUN 13 2017

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

1014 PM     TSTM WND GST     2 N SHELDON             43.21N 95.84W
06/13/2017  M67 MPH          O'BRIEN            IA   AWOS

&&

AF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 8:41 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	34 min
Jun 13, 8:43 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	47 min
Jun 13, 9:10 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	50 min
Jun 13, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	47 min
Jun 13, 9:16 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Plymouth, Woodbury	44 min
Jun 13, 9:40 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	35 min
Jun 13, 9:43 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien, Plymouth, Sioux	47 min
Jun 13, 9:51 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee, Ida, Woodbury	24 min
Jun 13, 9:58 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola, Sioux	47 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2017 Every severe thunderstorm warning in 2017

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.