Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 178, NWS Sioux Falls, SD

July 25, 20114 counties in Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 25, 2011, 6:15 PM CDT for 4 counties in Minnesota. It was in force for 30 min. 3 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
Jul 25, 2011, 6:15 PM CDT (23:15 UTC)
Expired
Jul 25, 2011, 6:45 PM CDT
In force
30 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Cottonwood County, MN, Jackson County, MN, Murray County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 101 km from the middle of the area, began a volume at 23:18 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

TimeReportWhereRemark
Jul 25, 6:27 PM CDTHAIL 1Avoca, MNIN ADDITION TO HAIL ESTIMATED AT 1 INCH IN DIAMETER, 1.00 INCH OF RAIN WAS MEASURED.
Jul 25, 6:48 PM CDTHAIL 1.55 Nnw Brewster, MN
Jul 25, 6:53 PM CDTHAIL 16 N Worthington, MN

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 12:00Z, 11.3 hours before the alert went out and 193 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2011-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2011-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1775 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
206 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.

278 
WUUS53 KFSD 252315
SVRFSD
MNC033-063-101-105-252345-
/O.NEW.KFSD.SV.W.0178.110725T2315Z-110725T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
615 PM CDT MON JUL 25 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN COTTONWOOD COUNTY IN SOUTHWEST MINNESOTA...
  NORTHWESTERN JACKSON COUNTY IN SOUTHWEST MINNESOTA...
  SOUTHEASTERN MURRAY COUNTY IN SOUTHWEST MINNESOTA...
  NORTHEASTERN NOBLES COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 645 PM CDT

* AT 616 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR FULDA...OR 9 MILES SOUTHEAST OF SLAYTON...AND MOVING
  SOUTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BREWSTER AROUND 645 PM 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 4367 9531 4364 9570 4393 9578 4399 9543
TIME...MOT...LOC 2316Z 343DEG 20KT 4387 9565
WIND...HAIL 60MPH 1.00IN

$$

CJ
1 follow-up statement
490 
WWUS53 KFSD 252331
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
631 PM CDT MON JUL 25 2011

MNC033-063-101-105-252345-
/O.CON.KFSD.SV.W.0178.000000T0000Z-110725T2345Z/
COTTONWOOD MN-JACKSON MN-MURRAY MN-NOBLES MN-
631 PM CDT MON JUL 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
NOBLES...SOUTHEASTERN MURRAY...NORTHWESTERN JACKSON AND SOUTHWESTERN
COTTONWOOD COUNTIES UNTIL 645 PM CDT...

AT 630 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED NEAR FULDA...OR 12 MILES SOUTHEAST OF 
SLAYTON...MOVING SOUTH AT 25 MPH. ANOTHER SEVERE STORM WAS LOCATED 
NEAR AVOCA AND ALSO MOVING TO THE SOUTH AT 25 MPH.

AT 627 PM CDT...QUARTER SIZE HAIL WAS REPORTED IN AVOCA.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BREWSTER AROUND 645 PM 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 4367 9531 4364 9570 4393 9578 4399 9543
TIME...MOT...LOC 2330Z 343DEG 20KT 4383 9562
WIND...HAIL <58MPH 1.00IN

$$

CJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 3:53 PM CDTSevere Thunderstorm WarningFSDLincoln, Lyon37 min
Jul 25, 4:21 PM CDTSevere Thunderstorm WarningFSDLyon54 min
Jul 25, 5:33 PM CDTSevere Thunderstorm WarningFSDCottonwood, Murray42 min
Jul 25, 6:44 PM CDTSevere Thunderstorm WarningFSDJackson, Nobles46 min

Nearby

Severe 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.