Alert archive / Iowa / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 21, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 28, 2017, 7:33 PM CDT for Lyon County, Osceola County, Iowa; Nobles County, Rock County, Minnesota. It was in force for 27 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 28, 2017, 7:33 PM CDT (00:33 UTC)
- Expired
- May 28, 2017, 8:00 PM CDT
- In force
- 27 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Lyon County, IA, Osceola County, IA, Nobles County, MN, Rock County, MN
The radar
The Sioux Falls radar (KFSD), 69 km from the middle of the area, began a volume at 00:35 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 |
|---|---|---|---|
| May 28, 7:44 PM CDT | TSTM WND GST 60 | 4 E Ellsworth, MN | |
| May 28, 7:53 PM CDT | TSTM WND DMG | Little Rock, IA | 4 INCH DIAMETER TREE BRANCHES DOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 231 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.
- Mixed-layer CAPE
- 8 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 1998 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
148 WUUS53 KFSD 290033 SVRFSD IAC119-143-MNC105-133-290100- /O.NEW.KFSD.SV.W.0021.170529T0033Z-170529T0100Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Sioux Falls SD 733 PM CDT SUN MAY 28 2017 The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Northeastern Lyon County in northwestern Iowa... Northwestern Osceola County in northwestern Iowa... Southeastern Rock County in southwestern Minnesota... Southwestern Nobles County in southwestern Minnesota... * Until 800 PM CDT * At 733 PM CDT, severe thunderstorms were located along a line extending from 6 miles east of Blue Mounds State Park to 6 miles southeast of Luverne, moving southeast at 50 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Severe thunderstorms will be near, Adrian and Ellsworth around 740 PM CDT. Little Rock and Rushmore around 750 PM CDT. Other locations impacted by these severe thunderstorms include Magnolia. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4358 9564 4336 9584 4357 9620 4372 9605 TIME...MOT...LOC 0033Z 300DEG 44KT 4367 9606 4358 9614 HAIL...<.75IN WIND...60MPH $$ JM
2 follow-up statements
172 WWUS53 KFSD 290043 SVSFSD Severe Weather Statement National Weather Service Sioux Falls SD 743 PM CDT SUN MAY 28 2017 IAC119-143-MNC105-133-290100- /O.CON.KFSD.SV.W.0021.000000T0000Z-170529T0100Z/ Lyon IA-Osceola IA-Rock MN-Nobles MN- 743 PM CDT SUN MAY 28 2017 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR NORTHEASTERN LYON...NORTHWESTERN OSCEOLA...SOUTHEASTERN ROCK AND SOUTHWESTERN NOBLES COUNTIES... At 743 PM CDT, severe thunderstorms were located along a line extending from Adrian to Ellsworth, moving southeast at 45 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe storms will be near... Rushmore around 750 PM CDT. Little Rock around 755 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4358 9564 4336 9584 4352 9611 4369 9595 TIME...MOT...LOC 0043Z 299DEG 39KT 4361 9592 4352 9600 HAIL...<.75IN WIND...60MPH $$ JM
950
WWUS53 KFSD 290058
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
758 PM CDT SUN MAY 28 2017
IAC119-143-MNC105-133-290107-
/O.EXP.KFSD.SV.W.0021.000000T0000Z-170529T0100Z/
Lyon IA-Osceola IA-Rock MN-Nobles MN-
758 PM CDT SUN MAY 28 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LYON...
NORTHWESTERN OSCEOLA...SOUTHEASTERN ROCK AND SOUTHWESTERN NOBLES
COUNTIES WILL EXPIRE AT 800 PM CDT...
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire.
LAT...LON 4358 9564 4336 9584 4352 9611 4369 9595
TIME...MOT...LOC 0057Z 300DEG 44KT 4352 9572 4343 9580
$$
JMThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 7:56 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola | 34 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2017Severe Thunderstorm Warnings in Minnesota, 2017Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.