Alert archive / Iowa / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 200, NWS Des Moines, IA

June 24, 2006Hamilton County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 24, 2006, 6:43 PM CDT for Hamilton County, Iowa. It was in force for 47 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: Jun 24, 2006, 6:43 PM CDT (23:43 UTC)
Expired: Jun 24, 2006, 7:30 PM CDT
In force: 47 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Hamilton County, IA

The radar

The Des Moines radar (KDMX), 73 km from the middle of the area, began a volume at 23:43 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, 11.7 hours before the alert went out and 250 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: 80 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 787 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 8 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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 24, 2:40 PM CDT, 4 hours 3 minutes earlier.

Area forecast discussion, Jun 24, 2:40 PM CDT, 4 hours 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
240 PM CDT SAT JUN 24 2006

.DISCUSSION...

MAIN CONCERNS FOR THIS FORECAST PERIOD REVOLVE AROUND PRECIP CHANCES
THROUGH SUNDAY EVENING.  BEST AXIS OF CAPE THIS AFTERNOON IS IN SRN
MN ASSOCIATED WITH A SURFACE LOW OVER SWRN MN AND AN UPPER LEVEL
SHORTWAVE COMING THROUGH THE UPPER MIDWEST.  CONVECTION HAS FIRED IN
SW/SCEN MN AND IS MOVING SERLY.  THOUGHTS ARE THAT AS THE COMPLEX
LEAVES THE MAIN AREA OF CAPE THAT THE SEVERE POTENTIAL WILL
DIMINISH.  THE NAM DOES INDICATE THAT THE AXIS OF HIGHER CAPE MAY
SINK A BIT SOUTH WHICH WOULD LIKELY KEEP THE SEVERE POTENTIAL GOING
IN THE FAR NRN PART OF THE CWA THROUGH THE EVENING HOURS.  OF MORE
INTEREST TO ME IS A SECONDARY SHORTWAVE BEHIND THIS ONE...WHICH WILL
COME IN FOR LATER THIS EVENING AND INTO THE EARLY MORNING HOURS.
BOTH MODELS INCREASE SHEAR THIS EVENING AHEAD OF THIS FEATURE.  THE
PROBLEM SO FAR TODAY FOR CENTRAL IOWA HAS BEEN ONLY POCKETS OF
HIGHER CAPE AND NEGLIGIBLE SHEAR.  THE STORMS POPS BUT CANNOT
SUSTAIN THEMSELVES.  THIS EVENING THE SHEAR WILL BE BETTER AND WITH
THE SHORTWAVE COMING IN I THINK THE SEVERE POTENTIAL MAY BE A BIT
BETTER...BUT ONCE AGAIN THE CAVEAT IS THE LACK OF HIGHER CAPE VALUES
OVER A LARGER AREA.  IN THE SOUTHEAST...THERE IS A NARROW AXIS OF
GOOD 0-3KM CAPE BUT SHEAR IS ANEMIC.  DECENT RAINFALL OVER ISOLATED
AREAS IS WHAT IS BEING REPORTED.

FOR SUNDAY...UPPER WAVE PUSHES EAST AND BEGINS TO CLOSE OFF WHILE
THE SURFACE LOW SINKS SOUTHEAST OVER THE EASTERN CWA.  WRAP AROUND
PRECIP WILL CONTINUE TOMORROW AND THERE WILL BE WEAKER VORT LOBES
SWINGING DOWN AROUND THE UPPER WAVE. WIDELY SCATTERED SHOWERS AND
THUNDERSTORMS IN THE AFTERNOON A FAIRLY GOOD BET BUT SEVERE
POTENTIAL IS MINIMAL.  DRY MONDAY BUT THE WEATHER PROBLEM THEN
BECOMES THE PERSISTENT LOW OVER THE GREAT LAKES AND WEAK VORT MAXES
ROTATING AROUND THE UPPER LOW.  NORTHWEST FLOW WILL MAINTAIN ITSELF
OVER THE AREA THROUGH THE EXTENDED WITH SMALL CHANCE POPS TUESDAY
NIGHT THROUGH WEDNESDAY.  MODELS ALSO ADVERTISING A FAIRLY GOOD COOL
DOWN MID TO LATE WEEK WITH HIGHS IN THE 70S TO LOWER 80S.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

FAB

Hazardous weather outlook, Jun 24, 5:10 PM CDT, 1 hour 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
510 PM CDT SAT JUN 24 2006

IAZ004>007-015>017-023>028-037>039-251100-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-HARDIN-GRUNDY-
BLACK HAWK-
510 PM CDT SAT JUN 24 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN
IOWA...GENERALLY NORTH OF STATE HIGHWAY 20.

.DAY ONE...TONIGHT

THUNDERSTORMS WILL AFFECT NORTHERN IOWA THROUGH THE OVERNIGHT HOURS.
ISOLATED SEVERE WEATHER IS POSSIBLE...MAINLY IN THE FORM OF HAIL UP
TO QUARTER SIZE. AN ISOLATED STRAIGHT LINE WIND GUST NEAR 60 MPH IS
NOT OUT OF THE QUESTION...BUT NOT LIKELY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SCATTERED THUNDERSTORMS ARE POSSIBLE SUNDAY...AND A FEW STORMS
COULD BE SEVERE DURING THE AFTERNOON HOURS...WITH HAIL UP TO ONE
INCH IN DIAMETER THE MAIN THREAT. THERE IS A CHANCE FOR NON SEVERE
THUNDERSTORMS OVER NORTHERN IOWA TUESDAY AFTERNOON AND EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THROUGH 9 PM THIS EVENING.

IAZ033>036-044>050-057>062-070>075-081>086-092>097-251100-
SAC-CALHOUN-WEBSTER-HAMILTON-CRAWFORD-CARROLL-GREENE-BOONE-STORY-
MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-POWESHIEK-CASS-
ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-
MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
510 PM CDT SAT JUN 24 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND SOUTHERN IOWA.

.DAY ONE...LATE THIS AFTERNOON AND TONIGHT

SCATTERED SEVERE THUNDERSTORMS WILL CONTINUE TONIGHT OVER CENTRAL
AND SOUTHERN IOWA. IN ADDITION...SOME STORMS WILL PRODUCE INTENSE
RAINFALL LASTING FROM ONE HALF TO ONE HOUR. MAXIMUM RAINFALL AMOUNTS
AROUND ONE TO TWO INCHES ARE POSSIBLE. THE INTENSE RAIN WILL PRODUCE
SOME NUISANCE STREET FLOODING IN URBAN AREAS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SCATTERED THUNDERSTORMS ARE POSSIBLE SUNDAY...AND A FEW STORMS
COULD BE SEVERE DURING THE AFTERNOON HOURS...WITH HAIL UP TO ONE
INCH IN DIAMETER THE MAIN THREAT. THERE IS A CHANCE FOR NON SEVERE
THUNDERSTORMS OVER NORTHERN IOWA TUESDAY AFTERNOON AND EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THROUGH 9 PM THIS EVENING.

In the hours before

Local storm report, Jun 24, 5:04 PM CDT, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
504 PM CDT SAT JUN 24 2006

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

0445 PM     HAIL             2 S FERGUSON            41.91N 92.86W
06/24/2006  E0.75 INCH       MARSHALL           IA   AMATEUR RADIO

            PENNY SIZE HAIL REPORTED BY AMATEUR RADIO SPOTTER.

&&

46

Local storm report, Jun 24, 5:32 PM CDT, 1 hour 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
532 PM CDT SAT JUN 24 2006

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

0520 PM     HAIL             2 W TAMA                41.96N 92.61W
06/24/2006  E0.75 INCH       TAMA               IA   TRAINED SPOTTER

&&

BF

Local storm report, Jun 24, 6:36 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
636 PM CDT SAT JUN 24 2006

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

0629 PM     HAIL             WATERLOO                42.49N 92.35W
06/24/2006  E0.88 INCH       BLACK HAWK         IA   EMERGENCY MNGR

            NICKEL SIZE HAIL REPORTED BY EMERGENCY MANAGEMENT IN THE
            SOUTH SIDE OF WATERLOO.

&&

46

Local storm report, Jun 24, 6:37 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
637 PM CDT SAT JUN 24 2006

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

0620 PM     HAIL             5 WNW WATERLOO          42.53N 92.44W
06/24/2006  E1.00 INCH       BLACK HAWK         IA   TRAINED SPOTTER

            QUARTER SIZE HAIL REPORTED BY TRAINED SPOTTER.

&&

46

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 24, 4:04 PM CDT	Severe Thunderstorm Warning	DMX	Marion	41 min
Jun 24, 4:33 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	27 min
Jun 24, 5:07 PM CDT	Severe Thunderstorm Warning	DMX	Tama	38 min
Jun 24, 5:20 PM CDT	Severe Thunderstorm Warning	DMX	Decatur	40 min
Jun 24, 6:13 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	47 min
Jun 24, 6:54 PM CDT	Severe Thunderstorm Warning	DMX	Webster	26 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.