Alert archive / Iowa / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 10, NWS Omaha, NE

March 29, 2004Harrison County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Mar 29, 2004, 1:09 PM CST for Harrison 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: Mar 29, 2004, 1:09 PM CST (19:09 UTC)
Expired: Mar 29, 2004, 1:45 PM CST
In force: 36 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Harrison County, IA

The radar

The Omaha radar (KOAX), 61 km from the middle of the area, began a volume at 19:09 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 12:00Z, 7.2 hours before the alert went out and 61 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1829 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Mar 29, 2:57 AM CST, 10 hours 12 minutes earlier.

Area forecast discussion, Mar 29, 2:57 AM CST, 10 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
257 AM CST MON MAR 29 2004

.DISCUSSION...
MAIN PROBLEMS TODAY WILL SURROUND SHOWER/THUDNERSTORM CHANCES. UPPER
LEVEL TROF THAT WAS RESPONSIBLE FOR INCREASE IN CONVECTIVE ACTIVITY
YESTERDAY WILL STILL BE OVER THE CWA TODAY.  THE STEEPEST LAPSE
RATES AND CORE OF THE COLDEST AIR ALOFT IS FORECAST TO MOVE ACROSS
SOUTHEAST NEBRASKA INTO SOUTHWEST IOWA THIS AFTERNOON.  LAPSE RATES
ARE FORECAST TO NOT BE QUITE AS STEEP IN NORTHEAST NEBRASKA...SO
WILL CARRY THE HIGHEST POPS SOUTH...WITH SLIGHTLY LOWER POPS TO THE
NORTH.  HAVE SOME CONCERN ABOUT HAIL POTENTIAL WITH SUCH LOW
FREEZING LEVELS.  WOULD NOT BE SURPRISED TO SEE SOME PEA SIZE HAIL
REPORTS THIS AFTERNOON...AND MAYBE AN ISOLATED STORM OR TWO
APPROACHING SEVERE LEVELS.  THE SHOWERS/THUNDERSTORMS SHOULD
DISSIPATE RATHER QUICKLY THIS EVENING AS THE SUN GOES DOWN.

THE NEXT CONCERN IS TEMPERATURES...ESPECIALLY TUESDAY INTO
WEDNESDAY.  A COLD FRONT IS EXPECTED TO MOVE ACROSS THE AREA TODAY
INTO TONIGHT WITH 850 MB TEMPERATURES FORECAST TO FALL INTO THE -6C
TO -8C RANGE BY TUESDAY MORNING.  MOISTURE IS ALSO FORECAST TO
INCREASE IN THE 900MB-850MB LAYER SUGGESTING THE POTENTIAL FOR
STRATOCUMULUS ON TUESDAY POSSIBLY LINGERING INTO WEDENSDAY.  FOR
THESE REASONS...HAVE ADJUSTED HIGHS ON TUESDAY AND WEDNESDAY
DOWNWARD INTO THE 40S.  AFTER COLLABORATION WITH SURROUNDING OFFICES
DEICDED TO ALSO COOL HIGHS ON THURSDAY A FEW DEGREES...BUT KEEP
THINGS IN THE LOWER TO MID 50S SINCE THE COLD AIR IS FORECAST TO
WARM A BIT BY THURSDAY AFTERNOON.

AN UPPER LOW IS STILL FORECAST TO DEVELOP OVER THE SOUTHWEST U.S.
LATE IN THE WEEK...AND SHOULD THEN OPEN UP AND MOVE INTO THE PLAINS
LATE IN THE WEEKEND OR EARLY NEXT WEEK.  OPTED TO KEEP THE DRY
FORECAST IN THE EXTENDED...WITH TIMING OF THIS SYSTEM STILL IN
DOUBT.

&&

 WATCHES/WARNINGS/ADVISORIES...
.NE...NONE.
.IA...NONE.

&&
KING

Hazardous weather outlook, Mar 29, 12:58 PM CST, 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1258 PM CST MON MAR 29 2004

IAZ043-NEZ011-012-015>018-030>034-042>044-300000-
ANTELOPE-BOONE-BURT-CEDAR-COLFAX-CUMING-DODGE-KNOX-MADISON-MONONA IA-
PIERCE-PLATTE-STANTON-THURSTON-WAYNE-
1258 PM CST MON MAR 29 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN NEBRASKA
AND SOUTHWEST IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP THROUGH MUCH OF
THE AFTERNOON...AND THEN DISSIPATE EARLY THIS EVENING. SOME OF THE
STRONGEST STORMS MAY BE ABLE TO PRODUCE PEA SIZE HAIL AND GUSTY
WINDS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT LIKELY BE NEEDED THIS AFTERNOON OR
TONIGHT.

IAZ055-056-069-079-080-090-091-NEZ045-050>053-065>068-078-088>093-
300000-
BUTLER-CASS-DOUGLAS-FREMONT IA-GAGE-HARRISON IA-JEFFERSON-JOHNSON-
LANCASTER-MILLS IA-MONTGOMERY IA-NEMAHA-OTOE-PAGE IA-PAWNEE-
POTTAWATTAMIE IA-RICHARDSON-SALINE-SARPY-SAUNDERS-SEWARD-SHELBY IA-
WASHINGTON-
1258 PM CST MON MAR 29 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN NEBRASKA
AND SOUTHWEST IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

PEA SIZE HAIL TO QUARTER SIZE WILL BE POSSIBLE THIS AFTERNOON ACROSS
SOUTHEASTERN NEBRASKA AND SOUTHWEST IOWA. WIND GUSTS OF 35 TO 50 MPH
WILL ALSO ACCOMPANY SCATTERED THUNDERSTORMS THAT WILL CONTINUE TO
DEVELOP THROUGH EARLY EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUESTED THIS AFTERNOON OR TONIGHT IN
SOME AREAS...ALTHOUGH A SEVERE THUNDERSTORM WATCH IS NOT ANTICIPATED
AT THIS TIME.

DEWALD

In the hours before

Local storm report, Mar 29, 12:26 PM CST, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
1226 PM CST MON MAR 29 2004

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

1220 PM     HAIL             WAVERLY                 40.91N 96.53W
03/29/2004  0.50 INCH        LANCASTER          NE   TRAINED SPOTTER

            MOSTLY PEA SIZE.

&&

DEWALD

Local storm report, Mar 29, 12:42 PM CST, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
1242 PM CST MON MAR 29 2004

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

1235 PM     HAIL             6 N ARLINGTON           41.54N 96.36W
03/29/2004  0.25 INCH        WASHINGTON         NE   TRAINED SPOTTER

            PEA SIZE HAIL COVERING THE GROUND.

&&

DEWALD

Local storm report, Mar 29, 12:44 PM CST, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
1244 PM CST MON MAR 29 2004

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

1243 PM     HAIL             2 W CRETE               40.63N 97.00W
03/29/2004  0.25 INCH        SALINE             NE   TRAINED SPOTTER

            35 TO 40 MPH WIND GUSTS.

&&

DEWALD

Local storm report, Mar 29, 12:55 PM CST, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
1255 PM CST MON MAR 29 2004

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

1233 PM     HAIL             6 NE ARLINGTON          41.52N 96.27W
03/29/2004  0.75 INCH        WASHINGTON         NE   TRAINED SPOTTER

&&

DEWALD

Local storm report, Mar 29, 12:56 PM CST, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
1256 PM CST MON MAR 29 2004

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

1251 PM     HAIL             4 SW WILBER             40.44N 97.02W
03/29/2004  0.25 INCH        SALINE             NE   EMERGENCY MNGR

&&

DEWALD

Local storm report, Mar 29, 1:04 PM CST, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
104 PM CST MON MAR 29 2004

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

0104 PM     HAIL             WILBER                  40.48N 96.96W
03/29/2004  0.88 INCH        SALINE             NE   EMERGENCY MNGR

&&

DEWALD

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 12:02 PM CST	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Saunders	28 min
Mar 29, 12:23 PM CST	Severe Thunderstorm Warning	OAX	Washington	37 min
Mar 29, 1:05 PM CST	Severe Thunderstorm Warning	OAX	Gage, Saline	40 min
Mar 29, 4:27 PM CST	Severe Thunderstorm Warning	OAX	Johnson, Otoe	33 min
Mar 29, 4:59 PM CST	Severe Thunderstorm Warning	OAX	Johnson	21 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2004 Every severe thunderstorm warning in 2004

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.