Alert archive / Iowa / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 291, NWS Omaha, NE

July 13, 2006Montgomery County, Page County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 13, 2006, 4:39 PM CDT for Montgomery County, Page County, Iowa. It was in force for 51 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: Jul 13, 2006, 4:39 PM CDT (21:39 UTC)
Expired: Jul 13, 2006, 5:30 PM CDT
In force: 51 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

Counties Montgomery County, IA, Page County, IA

The radar

The Omaha radar (KOAX), 113 km from the middle of the area, began a volume at 21:40 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 13, 12:21 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.7 hours before the alert went out and 113 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: 1747 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 168 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 Jul 13, 2:42 PM CDT, 1 hour 57 minutes earlier.

Area forecast discussion, Jul 13, 2:42 PM CDT, 1 hour 57 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
242 PM CDT THU JUL 13 2006

.DISCUSSION...

MOIST/UNSTABLE ATMOSPHERE OVER THE REGION MAINTAINING LINE OF
CONVECTION FROM EASTERN SD...TO NE AND CNTRL NEB THIS AFTERNOON.
ACTIVITY IS JUST AHEAD OF SURFACE LOW PRESSURE TROF THAT EXTENDED
SWD FROM THE CENTRAL DAKOTAS THRU NRN KS. AREA OF LOW PRESSURE
BEING INFLUENCED BY STRONG UPPER LEVEL SHORTWAVE ENERGY CROSSING
THE NRN PLAINS. UPDRAFTS APPEAR QUITE STRONG PER LATEST RADAR
TRENDS AS CELLS MOVE THRU 4000-5000J/KG CAPE ENVIRONMENT. WEATHER
WATCH ALREADY IN PLACE TILL 03Z TONIGHT.

FOR TONIGHT...MOIST/UNSTABLE AIRMASS REMAINS IN PLACE OVER THE CWA
THIS EVENING AHEAD OF APPROACHING NORTHERN PLAINS FRONT. ANTICIPATE
ENVIRONMENT WILL SUPPORT STRONG/SEVERE CONVECTION THRU EARLY EVENING.
FREEZING LEVEL QUITE HIGH...THUS LIMITING OVERALL HAIL THREAT.
MEANWHILE GOES SALT WINDEX PRODUCTS & DCAPE VALUES SUGGEST MAINLY
WIND EVENT. NAM TPI CONTOURS INDICATE SVR THREAT SHOULD DIMINISH
QUICKLY TOWARD LATE EVENING. AFTER MIDNIGHT...PCPN FOCUS SHIFTS TO
THE SOUTHERN CWA AS UPPER LEVEL ENERGY HEADS EAST AND FORCES
DRIER/MOST STABLE AIRMASS TO FILTER IN FROM THE NORTH. NICE WARM
WEEKEND ON TAP AS UPPER HIGH EDGES EAST AND THKNS INCREASE ACROSS THE
PLAINS. TRIPLE-DIGIT HIGHS PROBABLE SATURDAY AND SUNDAY MOST
LOCATIONS.

IN THE EXTENDED PERIODS...HAVE MADE SOME SUBTLE CHANGES TO POPS
AREAL COVERAGE. OTHERWISE MINOR ADJUSTMENT WRT TEMPS. FOR SUNDAY
NIGHT HAVE BACKED OFF POPS TILL AFTER MIDNIGHT FOR THE NRN CWA WITH
THE GFS SHOWING THE BOUNDARY NOT REACHING THE NRN CWA TILL CLOSE TO
12Z MON. MOISTURE POOLING ALONG THE FRONT RELATIVELY WEAK...BUT
ENOUGH TO WARRANT SMALL POPS. ON MONDAY THE MODELS APPEAR TO STALL
THE BOUNDARY NEAR THE SD/NEB BORDER WITH MODEST LIFT ADVERTISED
ACROSS THE NRN CWA. WILL THEREFORE MAINTAIN SMALL POPS NORTH WITH
PERSISTENT MOIST BNDRY LYR CONVERGENCE THRU THE DAY. LLVL JET
KICKS IN MONDAY NIGHT AND PUSHES THE BOUNDARY INTO SD/SRN MN. CANT
DISCOUNT THUNDER OVER THE NRN CWA SO WILL MAINTAIN OVERNIGHT POPS.
BY TUESDAY NIGHT...BEST DYNAMICS/MOISTURE GETS MOVED TO THE UPPER
MIDWEST. WITH NO SIGNIFICANT FEATURES SHOWN CROSSING THE CWA...WILL
GO AHEAD AND REMOVE POPS. OTHERWISE WILL CONTINUE DRY FCST
WEDNESDAY AND THURSDAY AS THE GFS SHOWS LITTLE REASON TO SUSPECT
PCPN OVER THE CWA DURING THIS TIME.

&&

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

&&

DEE

Hazardous weather outlook, Jul 13, 12:08 PM CDT, 4 hours 31 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1208 PM CDT THU JUL 13 2006

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-140715-
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-
1208 PM CDT THU JUL 13 2006

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

SEVERE THUNDERSTORMS ARE EXPECTED TO CONTINUE TO STRENGTHEN AND MOVE
SOUTHEAST ACROSS EASTERN NEBRASKA AND SOUTHWEST IOWA THIS
AFTERNOON AND EVENING. DAMAGING WINDS...LARGE HAIL...AND HEAVY
RAIN WILL BE THE PRIMARY HAZARDS.

VERY MOIST AND UNSTABLE CONDITIONS ARE IN PLACE ACROSS THE AREA.
THUNDERSTORMS HAVE BEEN ONGOING AND WILL FURTHER STRENTHEN AS A
STRONG UPPER LEVEL WEATHER DISTURBANCE MOVES ACROSS THE NORTHERN
PLAINS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A PROLONGED PERIOD OF HOT TEMPERATURES IS STILL EXPECTED ACROSS THE
REGION THROUGH EARLY NEXT WEEK. HIGH TEMPERATURES ARE FORECAST TO
RANGE FROM THE LOWER AND MID 90S TO A LITTLE ABOVE 100. HEAT
INDICES DURING THIS TIME COULD REACH 105 TO 110 DURING THE HOTTEST
PART OF THE DAY.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION WILL REQUIRED THIS AFTERNOON AND THIS
EVENING.

SPOTTERS ARE ENCOURAGED TO REPORT HAIL OVER ONE HALF INCH
AND RAINFALL AMOUNTS OVER ONE INCH TO THE NATIONAL WEATHER
SERVICE AT OMAHA.

ZAPOTOCNY

In the hours before

Local storm report, Jul 13, 4:03 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
403 PM CDT THU JUL 13 2006

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

0356 PM     HAIL             STAPLEHURST             40.97N 97.17W
07/13/2006  E1.75 INCH       SEWARD             NE   LAW ENFORCEMENT

&&

RPIATT

Local storm report, Jul 13, 4:15 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
415 PM CDT THU JUL 13 2006

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

0341 PM     TSTM WND DMG     N PLATTSMOUTH           41.01N 95.89W
07/13/2006                   CASS               NE   PUBLIC

            LARGE TREE LIMBS DOWN

0410 PM     TSTM WND DMG     OMAHA                   41.26N 96.01W
07/13/2006                   DOUGLAS            NE   TRAINED SPOTTER

            TURN SIGNAL POLE BLOWN DOWN NEAR 83RD AND MAPLE

&&

RPIATT

Special weather statement, Jul 13, 4:20 PM CDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
420 PM CDT THU JUL 13 2006

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-132315-
ANTELOPE-BOONE-BURT-BUTLER-CASS-CEDAR-COLFAX-CUMING-DODGE-DOUGLAS-
FREMONT IA-GAGE-HARRISON IA-JEFFERSON-JOHNSON-KNOX-LANCASTER-MADISON-
MILLS IA-MONONA IA-MONTGOMERY IA-NEMAHA-OTOE-PAGE IA-PAWNEE-PIERCE-
PLATTE-POTTAWATTAMIE IA-RICHARDSON-SALINE-SARPY-SAUNDERS-SEWARD-
SHELBY IA-STANTON-THURSTON-WASHINGTON-WAYNE-
INCLUDING THE CITIES OF...ALBION...AUBURN...BEATRICE...BELLEVUE...
BLAIR...BLOOMFIELD...CLARINDA...COLUMBUS...COUNCIL BLUFFS...CRETE...
DAVID CITY...FAIRBURY...FALLS CITY...FREMONT...GLENWOOD...HARLAN...
HARTINGTON...LINCOLN...LOGAN...NEBRASKA CITY...NELIGH...NORFOLK...
OMAHA...ONAWA...PAWNEE CITY...PENDER...PIERCE...PLATTSMOUTH...
RED OAK...SCHUYLER...SEWARD...SIDNEY...STANTON...TECUMSEH...
TEKAMAH...WAHOO...WAYNE...WEST POINT
420 PM CDT THU JUL 13 2006

...WARNING DECISION UPDATE FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

THE HP SUPERCELL STORM THAT IS PRESENTLY OVER MILLS AND
POTTAWATTAMIE COUNTIES AND IS MOVING SOUTHEAST AT 35-40 KTS.  THIS
STM PRODUCED ONE INCH HAIL AND 50-60 MPH WIND GUSTS OVER VARIOUS
LOCATIONS ACROSS DOUGLAS AND SARPY COUNTIES.  THIS BOW ECHO COMPLEX
WILL CONT MOVG SEWD INTO FREMONT PAGE AND MONTGOMERY COUNTIES THRU 5
PM. THERE IS STILL A THREAT OF DMGG WNDS AND MARGINALLY LRG HAIL WITH
THIS COMPLEX AS IT DRIVES SEWD.

NEW TSTMS HAV DVLPD FM SAUNDERS COUNTY W TO SEWARD COUNTY ALG
OUTFLOW BNDRY THAT WAS CREATED BY THE BOW ECHO COMPLEX.  ONE STORM
AT STAPLEHURST AND IN NORTHERN PART OF SEWARD IN SEWARD COUNTY
PRODUCED GOLFBALL HAIL. THESE STORMS WILL BE WATCHED CLOSELY FOR ANY
FURTHER DEVELOPMENT. ATTM IT APPRS THAT THESE STMS WILL PROD LRG HAIL
AND ISOLD WIND GUSTS.

FURTHER BACK...TSTMS HAVE BEEN OCRG ALG THE SFC TROF OVR HOLT...
GARFIELD AND WHEELER COUNTIES.  THESE STORMS HAVE NOT MOVED EWD
VERY FAST AND MAY NOT POSE A THREAT ACROSS THE OAX CWA DURG THE NEXT
2-3 HOURS.

SMITH

Local storm report, Jul 13, 4:22 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
422 PM CDT THU JUL 13 2006

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

0415 PM     TSTM WND DMG     GRETNA                  41.14N 96.24W
07/13/2006                   SARPY              NE   TRAINED SPOTTER

            1-3 INCH SIZE BRANCHES DOWN THROUGHOUT TOWN

0353 PM     TSTM WND GST     GLENWOOD                41.05N 95.74W
07/13/2006  E45 MPH          MILLS              IA   TRAINED SPOTTER

&&

VEGH

Local storm report, Jul 13, 4:24 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
424 PM CDT THU JUL 13 2006

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

0420 PM     HAIL             3 E SILVER CITY         41.11N 95.58W
07/13/2006  E0.75 INCH       MILLS              IA   PUBLIC

&&

VEGH

Local storm report, Jul 13, 4:34 PM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
434 PM CDT THU JUL 13 2006

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

0425 PM     HAIL             6 SW GRETNA             41.08N 96.33W
07/13/2006  E0.88 INCH       SARPY              NE   LAW ENFORCEMENT

            PLATTE RIVER/I80

0430 PM     HAIL             6 SW GRETNA             41.08N 96.33W
07/13/2006  E1.50 INCH       SARPY              NE   LAW ENFORCEMENT

&&

VEGH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 12:39 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Stanton	51 min
Jul 13, 1:56 PM CDT	Severe Thunderstorm Warning	OAX	Platte	34 min
Jul 13, 2:10 PM CDT	Severe Thunderstorm Warning	OAX	Colfax	50 min
Jul 13, 2:26 PM CDT	Severe Thunderstorm Warning	OAX	Butler	35 min
Jul 13, 2:32 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Saunders	43 min
Jul 13, 2:57 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	48 min
Jul 13, 3:06 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	39 min
Jul 13, 3:08 PM CDT	Severe Thunderstorm Warning	OAX	Washington	37 min
Jul 13, 3:16 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	29 min
Jul 13, 3:40 PM CDT	Severe Thunderstorm Warning	OAX	Cass	50 min
Jul 13, 3:44 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	46 min
Jul 13, 3:45 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	30 min
Jul 13, 3:59 PM CDT	Severe Thunderstorm Warning	OAX	Seward	31 min
Jul 13, 4:16 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	44 min
Jul 13, 4:24 PM CDT	Severe Thunderstorm Warning	OAX	Cass	51 min
Jul 13, 4:33 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	27 min
Jul 13, 5:00 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	45 min
Jul 13, 5:08 PM CDT	Severe Thunderstorm Warning	OAX	Cass	52 min
Jul 13, 5:14 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	24 min
Jul 13, 5:40 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	38 min
Jul 13, 5:48 PM CDT	Severe Thunderstorm Warning	OAX	Gage	42 min
Jul 13, 5:48 PM CDT	Severe Thunderstorm Warning	OAX	Johnson	42 min
Jul 13, 5:58 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Stanton	32 min
Jul 13, 6:07 PM CDT	Severe Thunderstorm Warning	OAX	Cuming	38 min
Jul 13, 6:22 PM CDT	Severe Thunderstorm Warning	OAX	Gage	38 min
Jul 13, 6:23 PM CDT	Severe Thunderstorm Warning	OAX	Johnson	37 min
Jul 13, 6:29 PM CDT	Severe Thunderstorm Warning	OAX	Dodge	61 min
Jul 13, 6:32 PM CDT	Severe Thunderstorm Warning	OAX	Knox	30 min
Jul 13, 6:36 PM CDT	Tornado Warning	OAX	Gage	39 min
Jul 13, 6:38 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	16 min
Jul 13, 6:49 PM CDT	Tornado Warning	OAX	Pawnee	41 min
Jul 13, 6:57 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	48 min
Jul 13, 6:59 PM CDT	Severe Thunderstorm Warning	OAX	Gage	33 min
Jul 13, 3:30 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	45 min
Jul 13, 4:12 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	63 min
Jul 13, 4:28 PM CDT	Severe Thunderstorm Warning	OAX	Fremont	47 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2006 Every severe thunderstorm warning in 2006

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.