Alert archive / Iowa / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 2, NWS Sioux Falls, SD

April 1, 2015Plymouth County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 1, 2015, 6:30 PM CDT for Plymouth County, Iowa. It was in force for 33 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: Apr 1, 2015, 6:30 PM CDT (23:30 UTC)
Expired: Apr 1, 2015, 7:03 PM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Plymouth County, IA

The radar

The Sioux Falls radar (KFSD), 103 km from the middle of the area, began a volume at 23:32 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
Apr 1, 6:46 PM CDT	HAIL 0.75	2 W Le Mars, IA	HAIL DURATION 4 MINUTES.

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
Apr 1, 5:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 151 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: 2766 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 366 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.

290 
WUUS53 KFSD 012330
SVRFSD
IAC149-020015-
/O.NEW.KFSD.SV.W.0002.150401T2330Z-150402T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
630 PM CDT WED APR 1 2015

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN PLYMOUTH COUNTY IN NORTHWESTERN IOWA...

* UNTIL 715 PM CDT

* AT 629 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES NORTH OF
  JEFFERSON...OR 13 MILES NORTHEAST OF PONCA...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. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  MERRILL AROUND 655 PM CDT.
  LE MARS AROUND 710 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
WESTFIELD AND BRUNSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4262 9652 4263 9652 4265 9654 4266 9654
      4266 9656 4267 9656 4267 9658 4268 9657
      4269 9660 4277 9662 4284 9619 4267 9611
      4261 9653
TIME...MOT...LOC 2329Z 257DEG 28KT 4271 9652 

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

$$
CHENARD

2 follow-up statements

143 
WWUS53 KFSD 012343
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
643 PM CDT WED APR 1 2015

IAC149-020015-
/O.CON.KFSD.SV.W.0002.000000T0000Z-150402T0015Z/
PLYMOUTH IA-
643 PM CDT WED APR 1 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR CENTRAL PLYMOUTH COUNTY...

AT 643 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR MERRILL...OR 8
MILES SOUTHWEST OF LE MARS...MOVING EAST AT 50 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. 

THIS SEVERE STORM WILL BE NEAR...
  LE MARS AROUND 655 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
BRUNSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4263 9639 4280 9643 4284 9619 4267 9611
      4264 9635
TIME...MOT...LOC 2343Z 259DEG 44KT 4274 9631 

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

$$

CHENARD

973 
WWUS53 KFSD 020003
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
703 PM CDT WED APR 1 2015

IAC149-020012-
/O.CAN.KFSD.SV.W.0002.000000T0000Z-150402T0015Z/
PLYMOUTH IA-
703 PM CDT WED APR 1 2015

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL PLYMOUTH COUNTY IS
CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4263 9639 4280 9643 4284 9619 4267 9611
      4264 9635
TIME...MOT...LOC 2358Z 257DEG 28KT 4277 9611 

$$

CHENARD

Nearby

Severe Thunderstorm Warnings in Iowa, 2015 Every severe thunderstorm warning in 2015

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.