Alert archive / Iowa / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 132, NWS Des Moines, IA

June 16, 2007Pocahontas County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 16, 2007, 4:42 PM CDT for Pocahontas County, Iowa. It was in force for 33 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 16, 2007, 4:42 PM CDT (21:42 UTC)
Expired
Jun 16, 2007, 5:15 PM CDT
In force
33 min
Issued by
NWS Des Moines, IA
Area
Counties, with a storm outline in the text

County Pocahontas County, IA

The radar

The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 21:44 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, 9.7 hours before the alert went out and 210 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 12:00Z on 2007-06-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 197 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 12:00Z on 2007-06-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -41 square meters per square second.1939Sfc1 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
197 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
1536 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-41 m²/s²
0-3 km storm-relative helicity
-7 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 16, 3:35 PM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jun 16, 3:35 PM CDT, 1 hour 7 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
335 PM CDT SAT JUN 16 2007

.DISCUSSION...
WESTERLIES ENTER THE CONUS IN THE PAC NW AND THEN RUN ENE ACROSS THE
NRN TIER OF STATES.  WATER VAPOR IMAGERY SHOWING DECENT LOOKING S/WV
OVER THE PAC NW WHICH WILL IMPACT IA IN THE MONDAY TIME FRAME.
OUTFLOW BOUNDARY FROM MORNING CONVECTION PUSHED SOUTH INTO CENTRAL
IA BY EARLY THIS AFTERNOON.  TSTMS FIRED ALONG BOUNDARY IN UNCAPPED
AMS.  EXPECT CONVECTION TO WEAKEN IN CENTRAL IA EARLY BUT IT MAY
LAST LONGER IN NRN IA WHERE THERE IS MORE SUPPORT FOR CONVECTION.
AFTER MIDNIGHT...BOUNDARIES SHOULD LIFT N OF IA AS UPSTREAM S/WV
APPROACHES. THEREFORE...CURRENT THINKING IS FOR TSTMS TO END IN DMX
CWA.

IA IN WARM SECTOR AHEAD OF APPROACHING SYSTEM SUNDAY. WILL FORECAST
WARM TEMPERATURES AND BREEZY CONDITIONS. WINDS SHOULD BE STRONGEST
NW WHERE GRADIENT IS TIGHTER AND 850 MB FLOW STRONGER.  WL HAVE NEAR
ADVRY CRITERIA WINDS BUT WILL HOLD OFF ON ADVRY FOR NOW.

GFS/NAM IN FAIR AGREEMENT LIFTING MOST OF THE S/WV ENERGY NE NORTH
OF IOWA ON MONDAY.  TRAINING COLD FRONT WILL MOVE INTO WARM AND
MOIST AMS OVER IA. THERE SHOULD BE ENOUGH FORCING TO GENERATE TSTMS.
CAPE AND DEEP SHEAR LOOK LIMITED SO SVR CONVECTION NOT LIKELY.

IN LONGER TERM...00Z GFS AND GFS ENSEMBLES LOOKED FAIRLY REASONABLE
THIS MORNING COMPARED WITH YESTERDAY.  OTHER EURO MODELS WERE
SIMILAR.  A LOW AMPLITUDE RIDGE WEST OF IA WITH A TROUGH TO THE
NORTHEAST. THERE WILL BE A WEST TO EAST SFC BOUNDARY ACROSS THE
CENTRAL STATES WITH THIS PATTERN.  WILL FORECAST TSTMS WITH A WEAK
SYSTEM TUE NIGHT AND WED OVR IA WITH SMALL POPS. WENT DRY BEYOND
THAT SINCE WE CANNOT NARROW DOWN SPECIFICS IN THE PATTERN. WITH THAT
SAID...THERE MAY IN POPS INTRODUCED AS THIS TIME PERIOD NEARS.

IOWA DNR ISSUED AN AIR QUALITY ADVRY EARLIER TODAY. NO PLANS TO
UPDATE THIS PRODUCT UNLESS WE HEAR FROM DNR.

.AVIATION 16/18Z...
OUTFLOW FM MCS OVR NIGHT SLID SWD INTO CNTRL IA AND WL BE THE FOCUS
FOR SOME TSRA DVLPMT.  WL REMAIN N OF KDSM AND KOTM HWVR.  DVLPMT
QUITE LKLY WITH THE SYS MOVG OUT OF SD AND CARRIED INTO THE EVE FOR
THE NRN 3 TAFS.  SHOULD SEE THE SD COMPLEX DVLP/DRFT MORE SWD AS
CORFIDI WNDS GRDLY TURN WLY TO NLY THIS EVE.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...AIR QUALITY ADVISORY THROUGH 17Z
SUNDAY ALL OF CWA.

&&

JOHNSON
Hazardous weather outlook, Jun 16, 1:32 PM CDT, 3 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
132 PM CDT SAT JUN 16 2007

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-171100-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-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-
132 PM CDT SAT JUN 16 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED THUNDERSTORMS ARE EXPECTED TODAY FROM INTERSTATE 80 NORTH.
SCATTERED THUNDERSTORMS WILL BE POSSIBLE TONIGHT NORTH OF U.S.
HIGHWAY 30.  THERE IS LITTLE CHANCE OF SEVERE THUNDERSTORMS...THOUGH
AN ISOLATED SEVERE STORM IS POSSIBLE NORTH OF U.S. HIGHWAY 18 THIS
EVENING...WITH NICKEL SIZE HAIL AND 60 MPH WINDS THE MAIN THREATS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE MONDAY AND MONDAY
NIGHT...AND AGAIN TUESDAY INTO TUESDAY NIGHT.  STORMS WILL BE MOST
WIDESPREAD ACROSS THE OUTLOOK AREA MONDAY AND MONDAY NIGHT. A FEW
SEVERE STORMS ARE POSSIBLE...ESPECIALLY IN THE NORTHEAST NEAR
WATERLOO AND MASON CITY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED ON AN ISOLATED BASIS THIS EVENING
OVER FAR NORTHERN IOWA.

In the hours before

Local storm report, Jun 16, 4:18 PM CDT, 24 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 16, 12:42 PM CDTAir Stagnation AdvisoryDMXAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more21 hr
Jun 16, 2:51 PM CDTSevere Thunderstorm WarningDMXBoone39 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2007Every severe thunderstorm warning in 2007

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.