Alert archive / Iowa / Special Weather Statements in 2015

Special Weather Statement, NWS Omaha, NE

August 2, 2015Montgomery County, Iowa

NWS Omaha, NE issued this special weather statement at Aug 2, 2015, 10:08 PM CDT for Montgomery County, Iowa. It was in force for 37 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 2, 2015, 10:08 PM CDT (03:08 UTC)
Expired: Aug 2, 2015, 10:45 PM CDT
In force: 37 min
Issued by: NWS Omaha, NE

County Montgomery County, IA

The radar

The Omaha radar (KOAX), 96 km from the middle of the area, began a volume at 03:09 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, 3.1 hours before the alert went out and 97 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: 3912 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1375 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 10.0

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, 6:17 PM CDT, 3 hours 51 minutes earlier.

Area forecast discussion, Aug 2, 6:17 PM CDT, 3 hours 51 minutes before

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Hazardous weather outlook, Aug 2, 6:31 PM CDT, 3 hours 37 minutes before

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In the hours before

Special weather statement, Aug 2, 6:25 PM CDT, 3 hours 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
625 PM CDT SUN AUG 2 2015

IAZ069-079-090-030015-
FREMONT IA-MILLS IA-POTTAWATTAMIE IA-
625 PM CDT SUN AUG 2 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN POTTAWATTAMIE...CENTRAL
MILLS AND NORTHWESTERN FREMONT COUNTIES UNTIL 715 PM CDT...

AT 625 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
GLENWOOD...OR 19 MILES SOUTHEAST OF OMAHA...MOVING SOUTHEAST AT 10
MPH.

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

LOCATIONS IMPACTED INCLUDE...
GLENWOOD...MALVERN...TABOR...SILVER CITY AND HASTINGS.

THIS INCLUDES HIGHWAY 34 IN IOWA BETWEEN MILE MARKERS 9 AND 20.

LAT...LON 4115 9580 4116 9557 4091 9539 4090 9570
TIME...MOT...LOC 2325Z 321DEG 8KT 4112 9570

ZAPOTOCNY

Local storm report, Aug 2, 6:36 PM CDT, 3 hours 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
636 PM CDT SUN AUG 02 2015

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

0634 PM     HAIL             GLENWOOD                41.05N 95.74W
08/02/2015  E1.25 INCH       MILLS              IA   PUBLIC

&&

MILLER

Local storm report, Aug 2, 6:44 PM CDT, 3 hours 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
644 PM CDT SUN AUG 02 2015

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

0615 PM     HAIL             1 NW GRANT              41.15N 95.00W
08/02/2015  E1.00 INCH       MONTGOMERY         IA   PUBLIC

0615 PM     HAIL             1 W GRANT               41.14N 95.00W
08/02/2015  E1.00 INCH       MONTGOMERY         IA   PUBLIC

&&

LANDSVORK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 7:35 PM CDT	Special Weather Statement	OAX	Saunders	25 min
Aug 2, 7:43 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	34 min
Aug 2, 7:54 PM CDT	Special Weather Statement	OAX	Boone	51 min
Aug 2, 7:58 PM CDT	Severe Thunderstorm Warning	OAX	Boone	21 min
Aug 2, 8:26 PM CDT	Special Weather Statement	OAX	Platte	49 min
Aug 2, 8:33 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	27 min
Aug 3, 11:07 AM CDT	Special Weather Statement	OAX	Richardson	38 min
Aug 3, 11:20 AM CDT	Severe Thunderstorm Warning	OAX	Richardson	25 min
Aug 2, 7:30 PM CDT	Special Weather Statement	OAX	Mills	60 min
Aug 2, 10:53 PM CDT	Special Weather Statement	OAX	Page	52 min
Aug 2, 10:59 PM CDT	Severe Thunderstorm Warning	OAX	Page	46 min
Aug 2, 11:40 PM CDT	Severe Thunderstorm Warning	OAX	Page	35 min

Nearby

Special Weather Statements in Iowa, 2015 Every special weather statement 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.