Alert archive / Iowa / Special Weather Statements in 2014

Special Weather Statement, NWS Omaha, NE

August 3, 2014Shelby County, Iowa

NWS Omaha, NE issued this special weather statement at Aug 3, 2014, 1:41 AM CDT for Shelby County, Iowa. It was in force for 49 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
Aug 3, 2014, 1:41 AM CDT (06:41 UTC)
Expired
Aug 3, 2014, 2:30 AM CDT
In force
49 min
Issued by
NWS Omaha, NE

County Shelby County, IA

The radar

The Omaha radar (KOAX), 98 km from the middle of the area, began a volume at 06:40 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 00:00Z, 6.7 hours before the alert went out and 99 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 00:00Z on 2014-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 793 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 00:00Z on 2014-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
793 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1622 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 2, 11:28 PM CDT, 2 hours 13 minutes earlier.

Area forecast discussion, Aug 2, 11:28 PM CDT, 2 hours 13 minutes before
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Hazardous weather outlook, Aug 2, 4:30 PM CDT, 9 hours 11 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
430 PM CDT SAT AUG 2 2014

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-031130-
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-
430 PM CDT SAT AUG 2 2014

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

.DAY ONE...TONIGHT AND SUNDAY

ISOLATED TO SCATTERED THUNDERSTORMS MAY DEVELOP THIS EVENING OVER
NORTHEAST NEBRASKA. SOME OF THESE THUNDERSTORMS MAY SPREAD
SOUTHEAST OVERNIGHT INTO THE REST OF EASTERN NEBRASKA AND WESTERN
IOWA BY SUNDAY MORNING. WIDESPREAD SEVERE WEATHER IS NOT
EXPECTED...BUT AN ISOLATED STRONG STORM IS POSSIBLE THIS EVENING
IN NORTHEAST NEBRASKA WITH HAIL AND WIND THE MAIN THREATS.

.DAYS TWO THROUGH SEVEN...SUNDAY NIGHT THROUGH FRIDAY

THERE IS A CHANCE OF THUNDERSTORMS ON SUNDAY NIGHT...AS WELL AS
MUCH OF NEXT WEEK ACROSS MOST OF THE AREA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY NOT BE NEEDED TONIGHT OR SUNDAY.

In the hours before

Special weather statement, Aug 2, 9:17 PM CDT, 4 hours 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
917 PM CDT SAT AUG 2 2014

NEZ012-030315-
CEDAR NE-
917 PM CDT SAT AUG 2 2014

...SIGNIFICANT WEATHER ADVISORY FOR CEDAR COUNTY UNTIL 1015 PM CDT...

AT 917 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
WYNOT...OR 12 MILES WEST OF VERMILLION...MOVING SOUTH AT 10 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
HARTINGTON...COLERIDGE...WYNOT...FORDYCE...ST. HELENA...OBERT AND
BROOKY BOTTOM.

LAT...LON 4282 9721 4281 9720 4280 9716 4277 9711
      4277 9705 4276 9702 4269 9701 4245 9702
      4244 9741 4280 9737
TIME...MOT...LOC 0217Z 347DEG 8KT 4272 9716

ZAPOTOCNY
Local storm report, Aug 2, 9:47 PM CDT, 3 hours 54 minutes before
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Special weather statement, Aug 3, 12:45 AM CDT, 56 minutes before
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Special weather statement, Aug 3, 1:24 AM CDT, 17 minutes before
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Special weather statement, Aug 3, 1:41 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 9:17 PM CDTSpecial Weather StatementOAXCedar58 min
Aug 2, 9:30 PM CDTSevere Thunderstorm WarningOAXCedar45 min
Aug 2, 10:25 PM CDTSevere Thunderstorm WarningOAXCedar34 min
Aug 3, 2:03 AM CDTSpecial Weather StatementOAXCass42 min
Aug 3, 3:02 AM CDTSpecial Weather StatementOAXNemaha, Richardson43 min
Aug 3, 3:50 AM CDTSpecial Weather StatementOAXNemaha, Richardson40 min
Aug 3, 12:45 AM CDTSpecial Weather StatementOAXPottawattamie45 min
Aug 3, 1:24 AM CDTSpecial Weather StatementOAXMills36 min
Aug 3, 4:48 AM CDTSpecial Weather StatementOAXFremont42 min

Nearby

Special Weather Statements in Iowa, 2014Every special weather statement in 2014

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.