Alert archive / Iowa / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 53, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 9, 2011, 4:08 AM CDT for Lyon County, Osceola County, Iowa; Nobles County, Minnesota. It was in force for 52 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
- May 9, 2011, 4:08 AM CDT (09:08 UTC)
- Expired
- May 9, 2011, 5:00 AM CDT
- In force
- 52 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 58.0 mph
Counties Lyon County, IA, Osceola County, IA, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 78 km from the middle of the area, began a volume at 09:10 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.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 9.1 hours before the alert went out and 222 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1913 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 415 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
622
WUUS53 KFSD 090908
SVRFSD
IAC119-143-MNC105-091000-
/O.NEW.KFSD.SV.W.0053.110509T0908Z-110509T1000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
408 AM CDT MON MAY 9 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN LYON COUNTY IN NORTHWEST IOWA...
NORTHERN OSCEOLA COUNTY IN NORTHWEST IOWA...
NOBLES COUNTY IN SOUTHWEST MINNESOTA...
* UNTIL 500 AM CDT
* AT 408 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL. THIS STORM WAS LOCATED NEAR ELLSWORTH...OR 12 MILES
NORTHEAST OF ROCK RAPIDS...AND MOVING EAST AT 35 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
ADRIAN AND LISMORE AROUND 415 AM CDT...
SIBLEY AROUND 420 AM CDT...
RUSHMORE AROUND 425 AM CDT...
WILMONT AROUND 430 AM CDT...
WORTHINGTON AND OCHEYEDAN AROUND 440 AM CDT...
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 4343 9545 4337 9601 4373 9606 4374 9606
4384 9554
TIME...MOT...LOC 0908Z 254DEG 29KT 4354 9597
WIND...HAIL <58MPH 1.00IN
$$
MJF2 follow-up statements
130
WWUS53 KFSD 090928
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
428 AM CDT MON MAY 9 2011
IAC119-090937-
/O.CAN.KFSD.SV.W.0053.000000T0000Z-110509T1000Z/
LYON IA-
428 AM CDT MON MAY 9 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LYON COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4340 9586 4342 9587 4350 9586 4350 9592
4373 9606 4375 9593 4384 9554 4343 9545
TIME...MOT...LOC 0927Z 254DEG 29KT 4358 9577
$$
IAC143-MNC105-091000-
/O.CON.KFSD.SV.W.0053.000000T0000Z-110509T1000Z/
OSCEOLA IA-NOBLES MN-
428 AM CDT MON MAY 9 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NOBLES AND
NORTHERN OSCEOLA COUNTIES UNTIL 500 AM CDT...
AT 427 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR RUSHMORE...OR 11 MILES WEST OF WORTHINGTON...
MOVING EAST AT 35 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
WORTHINGTON AROUND 445 AM CDT...
LATEST RADAR INDICATIONS WERE SHOWING STRONG SIGNS OF WEAKENING WITH
THIS THUNDERSTORM...BUT CONDITIONS WILL BE MONITORED FOR ANY
RESTRENGTHENING.
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 4340 9586 4342 9587 4350 9586 4350 9592
4373 9606 4375 9593 4384 9554 4343 9545
TIME...MOT...LOC 0927Z 254DEG 29KT 4358 9577
WIND...HAIL <58MPH 1.00IN
$$
MJF063
WWUS53 KFSD 090953
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
453 AM CDT MON MAY 9 2011
IAC143-MNC105-091003-
/O.EXP.KFSD.SV.W.0053.000000T0000Z-110509T1000Z/
OSCEOLA IA-NOBLES MN-
453 AM CDT MON MAY 9 2011
...THE SEVERE THUNDERSTORM WARNING FOR NOBLES AND NORTHERN OSCEOLA
COUNTIES WILL EXPIRE AT 500 AM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
LAT...LON 4340 9586 4342 9587 4350 9586 4350 9592
4373 9606 4375 9593 4384 9554 4343 9545
TIME...MOT...LOC 0953Z 254DEG 29KT 4364 9549
$$
MJFThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 9:11 PM CDT | River Flood Warning | FSD | Plymouth | 12 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 2011Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm warning in 2011
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.