Alert archive / Iowa / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 247, NWS Omaha, NE

September 22, 2015Harrison County, Monona County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Sep 22, 2015, 12:54 PM CDT for Harrison County, Monona County, Iowa. It was in force for 36 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 22, 2015, 12:54 PM CDT (17:54 UTC)
Expired
Sep 22, 2015, 1:30 PM CDT
In force
36 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Harrison County, IA, Monona County, IA

The radar

The Omaha radar (KOAX), 73 km from the middle of the area, began a volume at 17:57 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

Omaha, NE (KOAX), launched 12:00Z, 5.9 hours before the alert went out and 73 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, Omaha, NE at 12:00Z on 2015-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 529 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2015-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 square meters per square second.193958Sfc1 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
529 J/kg
Mixed-layer CIN
-281 J/kg
Mixed-layer LCL
1052 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 22, 12:41 PM CDT, 13 minutes earlier.

Area forecast discussion, Sep 22, 12:41 PM CDT, 13 minutes before
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Hazardous weather outlook, Sep 22, 5:02 AM CDT, 7 hours 52 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
502 AM CDT TUE SEP 22 2015

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-230015-
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-
PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON-
STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER-
SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE-
JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
501 AM CDT TUE SEP 22 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST
NEBRASKA AND SOUTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

PATCHY DENSE FOG THIS MORNING. SPOTTY NON-SEVERE THUNDERSTORMS
POSSIBLE THIS MORNING AND THIS AFTERNOON. SCATTERED THUNDERSTORMS
TONIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A CHANCE OF THUNDERSTORMS...THEN THUNDERSTORMS BECOMING LIKELY
WEDNESDAY NIGHT FOR PARTS OF NORTHEAST AND EAST CENTRAL NEBRASKA
INTO WESTERN IOWA. A CHANCE OF THUNDERSTORMS THURSDAY...THEN
THUNDERSTORMS ENDING THURSDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

ZAPOTOCNY

In the hours before

Local storm report, Sep 22, 11:21 AM CDT, 1 hour 33 minutes before
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Local storm report, Sep 22, 11:25 AM CDT, 1 hour 29 minutes before
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Local storm report, Sep 22, 11:33 AM CDT, 1 hour 21 minutes before
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Local storm report, Sep 22, 11:46 AM CDT, 1 hour 8 minutes before
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Local storm report, Sep 22, 12:28 PM CDT, 26 minutes before
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Local storm report, Sep 22, 12:42 PM CDT, 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1242 PM CDT TUE SEP 22 2015

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

1225 PM     HAIL             DECATUR                 42.01N 96.26W
09/22/2015  E0.75 INCH       BURT               NE   TRAINED SPOTTER

&&

NWS OMAHA/VALLEY NE
IRIS SYSTEM

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 22, 8:40 AM CDTSpecial Weather StatementOAXPierce35 min
Sep 22, 9:12 AM CDTSevere Thunderstorm WarningOAXPierce, Wayne33 min
Sep 22, 9:48 AM CDTSpecial Weather StatementOAXStanton42 min
Sep 22, 9:52 AM CDTSevere Thunderstorm WarningOAXMadison, Stanton, Wayne23 min
Sep 22, 10:14 AM CDTSevere Thunderstorm WarningOAXStanton, Wayne31 min
Sep 22, 10:22 AM CDTSevere Thunderstorm WarningOAXStanton, Wayne12 min
Sep 22, 10:45 AM CDTSevere Thunderstorm WarningOAXCuming, Stanton35 min
Sep 22, 11:05 AM CDTSevere Thunderstorm WarningOAXCuming25 min
Sep 22, 11:29 AM CDTSevere Thunderstorm WarningOAXBurt, Cuming, Thurston46 min
Sep 22, 12:12 PM CDTSevere Thunderstorm WarningOAXBurt, Thurston48 min
Sep 22, 12:57 PM CDTSpecial Weather StatementOAXCuming48 min
Sep 22, 1:12 PM CDTSpecial Weather StatementOAXBurt48 min
Sep 22, 1:18 PM CDTSevere Thunderstorm WarningOAXBurt, Cuming, Thurston42 min
Sep 22, 1:39 PM CDTSevere Thunderstorm WarningOAXBurt27 min
Sep 22, 3:45 PM CDTSpecial Weather StatementOAXCass30 min
Sep 22, 4:12 PM CDTSpecial Weather StatementOAXDouglas, Washington48 min
Sep 22, 4:34 PM CDTSpecial Weather StatementOAXDouglas41 min
Sep 22, 6:58 PM CDTSpecial Weather StatementOAXNemaha47 min
Sep 22, 2:10 PM CDTSpecial Weather StatementOAXHarrison50 min
Sep 22, 2:51 PM CDTSpecial Weather StatementOAXShelby39 min
Sep 22, 3:20 PM CDTSevere Thunderstorm WarningOAXShelby25 min
Sep 22, 6:09 PM CDTSpecial Weather StatementOAXMontgomery36 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2015Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.