Severe Thunderstorm Warning 86, NWS Des Moines, IA

816 
WWUS53 KDMX 020152
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
852 PM CDT WED JUN 1 2011

IAC161-020230-
/O.CON.KDMX.SV.W.0086.000000T0000Z-110602T0230Z/
SAC IA-
852 PM CDT WED JUN 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SAC COUNTY
UNTIL 930 PM CDT...

AT 849 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
SOUTH OF LAKESIDE...OR 7 MILES SOUTH OF STORM LAKE...MOVING SOUTHEAST
AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  SAC CITY...LAKE VIEW...EARLY AND NEMAHA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN DES MOINES.

&&

LAT...LON 4257 9496 4256 9492 4225 9491 4236 9533
      4247 9533 4247 9538 4257 9538
TIME...MOT...LOC 0153Z 302DEG 17KT 4253 9518
WIND...HAIL 60MPH 1.00IN

$$

VACHALEK

982 
WWUS53 KDMX 020212
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
912 PM CDT WED JUN 1 2011

IAC161-020222-
/O.CAN.KDMX.SV.W.0086.000000T0000Z-110602T0230Z/
SAC IA-
912 PM CDT WED JUN 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SAC COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED ACROSS THE WARNED 
AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN DES MOINES.

LAT...LON 4257 9496 4256 9492 4225 9491 4236 9533
      4247 9533 4247 9538 4257 9538
TIME...MOT...LOC 0212Z 302DEG 17KT 4240 9507

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
645 PM CDT WED JUN 1 2011

.SHORT TERM /TONIGHT/...
HIGH PRESSURE OVER THE NORTHEAST HALF OF IOWA THIS AFTERNOON AND IS
GRADUALLY SHIFTING TO THE EAST/NORTHEAST. STRONG 850 MB MOISTURE
ADVECTION HAS DEVELOPED TO THE WEST ACROSS KANSAS AND NEBRASKA AND
THIS ADVECTION WILL VEER INTO IOWA OVERNIGHT...ESPECIALLY AFTER
MIDNIGHT. THE LOW LEVEL JET WILL BE FOCUSED INTO SOUTH DAKOTA MUCH
OF THE NIGHT WITH THE LEFT EXIT REGION LOCATED OVER SOUTHEAST SOUTH
DAKOTA. THE PRIMARY AREA OF THUNDERSTORMS LIKELY WILL DEVELOP IN
THIS REGION BEFORE SHIFTING SOUTHEAST INTO CENTRAL IOWA LATE.
ISOLATED TO SCATTERED THUNDERSTORMS ARE POSSIBLE AHEAD OF THE
PRIMARY AREA OF CONVECTION BY MID TO LATE EVENING. HEAVY RAINFALL IS
POSSIBLE WITH THESE STORMS WITH SLOW STORM MOTIONS AROUND 25
KTS...HIGH PWATS NEAR 1.75 INCHES AND WARM CLOUD DEPTHS ABOVE 13.5
KFT. THEREFORE STORMS SHOULD BE EFFICIENT RAIN PRODUCERS. INCREASING
SATURATION IN THE MID LEVELS WILL LIMIT HAIL POTENTIAL DUE TO
DIMINISHED LAPSE RATES AND HAIL CAPE. INITIAL STORMS COULD PRODUCE
STORMS WITH LARGE HAIL THOUGH BEFORE THE SATURATION OCCURS.

.LONG TERM /THURSDAY THROUGH WEDNESDAY/...
PERIOD BEGINS WITH OVERNIGHT MCS LINGERING INTO THU.  THERE IS SOME
UNCERTAINTY WHERE THIS WILL BE ROOTED AND AMOUNT OF INSTABILITY WITH
NAM SUGGESTING NEAR 500M AND ELEVATED CAPE 1-2K J/KG...WHILE THE GFS
DEPICTS 1.5KM AND UNDER 1K J/KG RESPECTIVELY.  CONSIDERING THE
STRENGTH OF THE WAA ADVECTION WOULD NOT BE SURPRISED TO SEE MARGINAL
HAIL/SEVERE WEATHER INTO THE MORNING REGARDLESS OF WHICH VERIFIES.
AFOREMENTIONED HEAVY RAIN POTENTIAL WILL LINGER AS WELL WITH MUCH OF
CENTRAL IA POSSIBLY SEEING AMOUNTS PUSHING AN INCH BY
MIDDAY...LOCALLY HIGHER POSSIBLE.

CAPPED WARM SECTOR WITH LITTLE FOCUS SHOULD THEN SURGE INTO IA LATER
THURSDAY AND FRIDAY LEADING INTO INCREASED HEAT AND HUMIDITY.
FORECAST SOUNDINGS WITH MIXING SUGGEST HIGHS IN THE LOWER 90S OVER
MANY AREAS FRI WITH DEWPOINTS PLUS/MINUS 70F CENTRAL AND SE LEADING
TO HEAT INDICES APPROACHING 100F DURING PEAK HEATING.

NEXT PRECIP CHANCES RETURN LATE FRI INTO SAT AS FRONT SAGS INTO IA
FROM THE NORTH AND WEST...MAINLY ELEVATED IN WAA.  LOW CONFIDENCE IN
BOUNDARY POSITION THROUGH THE WEEKEND AND EARLY NEXT WEEK AS FRONT
TRIES TO PUSH NORTHWARD UNDER CENTRAL CONUS RIDGE.  THIS KEEPS LOW
DISORGANIZED POPS IN THE FORECAST UNTIL RETURN OF WARM SECTOR MON
AHEAD OF NEXT SIOUXLAND FRONT INTO LATE TUE AND WED.

&&

.AVIATION...02/00Z
SURFACE LOW PRESSURE OUT TO THE WEST HAS A WARM FRONT WITH IT THAT
EXTENDS INTO WESTERN IA. THIS WARM FRONT WILL ESTABLISH ITSELF
FURTHER INTO CENTRAL IOWA THIS EVENING THEN LIFT NORTH OVERNIGHT
INTO MN.  WINDS OFF THE SURFACE WILL INCREASE AND FOCUS INTO NW IA
WHERE STORMS WILL INITIATE THEN MOVE INTO THE NORTHERN PORTIONS OF
CENTRAL IOWA.  AN UPPER LEVEL WAVE WILL SHIFT ACROSS CENTRAL IOWA
AFT 02/12Z BRINGING A SECOND ROUND OF CONVECTION IN PROXIMITY OF THE
FRONTAL BOUNDARY...THIS TIME SHIFTING THE STORM POTENTIAL FURTHER
SOUTH THEN LIFTING TO THE NE THROUGH 18Z.  TSRA CHANCES WILL BE
MAINLY CONFINED TO THE EAST AFT 18Z AND BE DIMINISHING.  MVFR CIGS
WILL OCCUR WITH STORMS WITH LOCAL IFR CONDITIONS POSSIBLE.  SFC FLOW
WILL INCREASE OUT OF THE SOUTH TO 15-25KTS WITH STRONGER GUSTS.

&&

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

&&

SHORT TERM...DONAVON
LONG TERM...SMALL
AVIATION...FAB

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
342 PM CDT WED JUN 1 2011

IAZ004-005-022045-
EMMET-KOSSUTH-
342 PM CDT WED JUN 1 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS WILL DEVELOP TONIGHT...BECOMING WIDESPREAD AFTER
MIDNIGHT. A FEW STORMS MAY BECOME SEVERE WITH LARGE HAIL THE
PRIMARY THREAT. HEAVY RAINFALL MAY OCCUR WITH THESE STORMS.

A FLOOD WARNING REMAINS IN EFFECT FOR PORTIONS OF THE UPPER DES
MOINES RIVER BASIN. PLEASE REFER TO THE NATIONAL WEATHER SERVICE
WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORMS ARE LIKELY THURSDAY MORNING. SEVERE WEATHER IS NOT
LIKELY...HOWEVER HEAVY RAINFALL IS POSSIBLE. LOCALIZED 2 TO
3 INCHES OF RAIN MAY OCCUR TONIGHT AND THURSDAY. THIS RAINFALL
COULD PUSH SMALLER STREAMS ABOVE FLOOD STAGE.

WIDELY SCATTERED THUNDERSTORMS WILL BE POSSIBLE OVER THE WEEKEND.
THE SEVERE THREAT FROM THESE APPEARS TO ARE LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE TONIGHT. RAINFALL REPORTS
ARE ENCOURAGED.

IAZ006-007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-022045-
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-
342 PM CDT WED JUN 1 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS WILL DEVELOP TONIGHT...BECOMING WIDESPREAD AFTER
MIDNIGHT. A FEW STORMS MAY BECOME SEVERE WITH LARGE HAIL THE
PRIMARY THREAT. HEAVY RAINFALL MAY OCCUR WITH THESE STORMS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORMS ARE LIKELY THURSDAY MORNING. SEVERE WEATHER IS NOT
LIKELY...HOWEVER HEAVY RAINFALL IS POSSIBLE. LOCALIZED 2 TO
3 INCHES OF RAIN MAY OCCUR TONIGHT AND THURSDAY. THIS RAINFALL
COULD PUSH SMALLER STREAMS ABOVE FLOOD STAGE.

WIDELY SCATTERED THUNDERSTORMS WILL BE POSSIBLE OVER THE WEEKEND.
THE SEVERE THREAT FROM THESE APPEARS TO ARE LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE TONIGHT. RAINFALL REPORTS
ARE ENCOURAGED.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
817 PM CDT WED JUN 1 2011

IAZ033-020330-
SAC-
INCLUDING THE CITY OF...SAC CITY
817 PM CDT WED JUN 1 2011

...AREA OF THUNDERSTORMS MOVING INTO THE REGION THIS EVENING...

AN AREA OF STRONG THUNDERSTORMS CONTINUES TO MOVE ACROSS NORTHWEST
IOWA THIS EVENING. THE THUNDERSTORMS MAY PRODUCE UP TO PENNY SIZED
HAIL AND WINDS TO 50 MPH AS THEY MOVE TO THE EAST SOUTHEAST AT 35
MPH THROUGH 10 PM CDT THIS WEDNESDAY EVENING. ADDITIONAL
THUNDERSTORMS ARE LIKELY LATER TONIGHT...WITH THE POTENTIAL FOR A
FEW SEVERE STORMS WITH LARGE HAIL...STRONG WINDS AND SOME BRIEF
HEAVY RAINFALL. THE AREA OF SHOWERS AND THUNDERSTORMS IS MOVING TO
THE EAST AT 35 MPH.

REV