Alert archive / Iowa / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 115, NWS Sioux Falls, SD

September 1, 2013Ida County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 1, 2013, 2:01 AM CDT for Ida County, Iowa. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 1, 2013, 2:01 AM CDT (07:01 UTC)
Expired: Sep 1, 2013, 2:30 AM CDT
In force: 29 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Ida County, IA

The radar

The Omaha radar (KOAX), 138 km from the middle of the area, began a volume at 07:02 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 31, 9:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 7.0 hours before the alert went out and 138 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: 2453 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1726 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 6.1

Open this sounding in Storm Lab

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 Sep 1, 12:50 AM CDT, 1 hour 11 minutes earlier.

Area forecast discussion, Sep 1, 12:50 AM CDT, 1 hour 11 minutes before

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Hazardous weather outlook, Aug 31, 10:35 AM CDT, 15 hours 26 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1035 AM CDT SAT AUG 31 2013

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-011200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
1035 AM CDT SAT AUG 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
A STRONG COLD FRONT WILL MOVE ACROSS THE AREA LATE THIS AFTERNOON
THROUGH THE OVERNIGHT. SCATTERED THUNDERSTORMS ARE EXPECTED TO
DEVELOP DURING THE LATE AFTERNOON OR EVENING OVER PORTIONS OF
SOUTHEAST SOUTH DAKOTA AND MOVE INTO SOUTHWEST
MINNESOTA...NORTHWEST IOWA AND EXTREME NORTHEAST NEBRASKA
TONIGHT. A FEW OF THE STRONGER STORMS COULD PRODUCE GOLF BALL
SIZE HAIL AND WIND GUSTS UP TO 70 MPH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 4 PM IN AFOREMENTIONED
AREAS.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

In the hours before

Local storm report, Aug 31, 11:27 PM CDT, 2 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1127 PM CDT SAT AUG 31 2013

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

1010 PM     HAIL             2 W SIOUX FALLS         43.54N 96.77W
08/31/2013  M1.00 INCH       MINNEHAHA          SD   NWS EMPLOYEE

1010 PM     HAIL             1 W SIOUX FALLS         43.54N 96.75W
08/31/2013  M2.50 INCH       MINNEHAHA          SD   PUBLIC

1016 PM     HAIL             SIOUX FALLS             43.54N 96.73W
08/31/2013  E1.75 INCH       MINNEHAHA          SD   BROADCAST MEDIA

            DOWNTOWN SIOUX FALLS AREA

&&

ADAMS

Local storm report, Aug 31, 11:31 PM CDT, 2 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1131 PM CDT SAT AUG 31 2013

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

1007 PM     TSTM WND GST     2 N SIOUX FALLS         43.57N 96.73W
08/31/2013  M45 MPH          MINNEHAHA          SD   ASOS

&&

ADAMS

Local storm report, Aug 31, 11:32 PM CDT, 2 hours 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1132 PM CDT SAT AUG 31 2013

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

1053 PM     TSTM WND GST     4 ENE JEFFERS           44.08N 95.12W
08/31/2013  M47 MPH          COTTONWOOD         MN   MESONET

&&

ADAMS

Local storm report, Sep 1, 12:19 AM CDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1219 AM CDT SUN SEP 01 2013

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

1100 PM     TSTM WND DMG     GEORGE                  43.34N 96.00W
08/31/2013                   LYON               IA   TRAINED SPOTTER

            6 TO 12 INCH DIAMETER LIMBS DOWN AROUND TOWN.

&&

ADAMS

Local storm report, Sep 1, 12:38 AM CDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1238 AM CDT SUN SEP 01 2013

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

1008 PM     TSTM WND DMG     3 SW SIOUX FALLS        43.51N 96.77W
08/31/2013                   MINNEHAHA          SD   BROADCAST MEDIA

            OUTDOOR CANOPY STYLE TENT DESTROYED AND MANGLED IN THE
            PARKING LOT OF THE EMPIRE MALL.

&&

ADAMS

Local storm report, Sep 1, 1:22 AM CDT, 39 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 9:31 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	29 min
Aug 31, 9:38 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	37 min
Aug 31, 9:53 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	52 min
Aug 31, 10:19 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	41 min
Aug 31, 9:17 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Osceola	43 min
Aug 31, 9:48 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson, O'Brien, Osceola	42 min
Aug 31, 10:16 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Dickinson, O'Brien, Osceola	59 min
Aug 31, 10:27 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Osceola	48 min
Aug 31, 10:55 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Osceola, Sioux	50 min
Aug 31, 11:34 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien, Sioux	41 min
Sep 1, 12:10 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien, Plymouth, Sioux	50 min
Sep 1, 12:13 AM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee, Clay, O'Brien	47 min
Sep 1, 12:35 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida, Plymouth	40 min
Sep 1, 12:45 AM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	45 min
Aug 31, 8:43 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Nobles, Rock	47 min
Aug 31, 9:58 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Nobles, Pipestone, Rock	47 min
Aug 31, 10:36 PM CDT	Severe Thunderstorm Warning	FSD	Jackson, Murray, Nobles	39 min
Aug 31, 10:43 PM CDT	Severe Thunderstorm Warning	FSD	Cottonwood	62 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2013 Every severe thunderstorm warning in 2013

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.