Alert archive / Iowa / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 79, NWS Des Moines, IA

June 18, 20094 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 2009, 1:41 AM CDT for 4 counties in Iowa. It was in force for 49 min. 21 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 18, 2009, 1:41 AM CDT (06:41 UTC)
Expired: Jun 18, 2009, 2:30 AM CDT
In force: 49 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Boone County, IA, Dallas County, IA, Polk County, IA, Story County, IA

The radar

The Des Moines radar (KDMX), 9 km from the middle of the area, began a volume at 06:44 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.

What was reported inside it

Time	Report	Where	Remark
Jun 18, 1:42 AM CDT	TSTM WND GST 60	3 Ssw Boone Airport, IA	AN OFF DUTY NATIONAL WEATHER SERVICE EMPLOYEE REPORTED WIND GUSTS TO 60 MPH 3 MILES SOUTH OF BOONE
Jun 18, 1:53 AM CDT	TSTM WND GST 58	Polk City, IA
Jun 18, 1:53 AM CDT	TSTM WND GST 70	2 N Madrid, IA	BOONE COUNTY LAW ENFORCEMENT RELAYED A REPORT FROM MADRID FIRE DEPARTMENT OF ESTIMATED 70 MPH GUSTS ABOUT TWO MILES NORTH OF MADRID
Jun 18, 1:55 AM CDT	TSTM WND DMG	Huxley, IA	STORY COUNTY LAW ENFORCEMENT REPORTS WIDESPREAD WIND DAMAGE IN AND AROUND HUXLEY. LINES DOWN...TREE LIMBS UP TO 20-INCH DIAMETER DOWN...A SHED BLOWN ACROSS A PARKING LOT...AND A TRACTOR TRAILER BLOWN INTO THE DITCH AT MILE 104 ON I-35. TIME ESTIMATED.
Jun 18, 1:55 AM CDT	TSTM WND GST 59	Madrid, IA	MANY SMALL TREE LIMBS...WITH SEVERAL 4 TO 6 INCH TREE BRANCHES BLOWN IN NEIGHBORHOOD. DELAYED REPORT
Jun 18, 1:58 AM CDT	TSTM WND DMG	Madrid, IA	BOONE COUNTY LAW ENFORCEMENT REPORTS 12 INCH LIMBS DOWN IN MADRID
Jun 18, 2:00 AM CDT	TSTM WND DMG	2 Se Huxley, IA	SEMI REPORTEDLY BLOWN OFF INTERSTATE 35 NEAR HIGHWAY 210. TIME ESTIMATED.
Jun 18, 2:00 AM CDT	TSTM WND DMG	5 S Huxley, IA	US HWY 69 CLOSED...DUE TO DOWNED POWER LINES...BETWEEN IA HWY 210 AND IA HWY 87 /NE 126TH AVE/. TIME ESTIMATED. DELAYED REPORT.
Jun 18, 2:00 AM CDT	TSTM WND DMG	Cambridge, IA	METAL OUT BUILDING BLOWN OVER AT TRAILER PARK. TIME ESTIMATED.
Jun 18, 2:00 AM CDT	TSTM WND DMG	Huxley, IA	LARGE BRANCHES AND POWER LINES DOWN.
Jun 18, 2:00 AM CDT	TSTM WND GST 60	3 S Polk City, IA	STRONG WIND BLOWN RAIN AT NWS OFFICE.
Jun 18, 2:00 AM CDT	TSTM WND GST 70	5 Nnw Ankeny Airport, IA	ALSO ROOF DAMAGE THROUGHOUT NEIGHBORHOOD. SIDING RIPPED OFF OF SOME HOUSES AS WELL. REPORT HAS BEEN CORRECTED FOR GUST MAGNITUDE...TIME OF EVENT /ORIGINALLY LISTED AS 208 AM CDT/ AND LOCATION.
Jun 18, 2:02 AM CDT	TSTM WND GST 60	4 Nnw Ankeny Airport, IA
Jun 18, 2:05 AM CDT	TSTM WND GST 65	Huxley, IA	POWER OUT. PEA HAIL. DAMAGE UNKNOWN.
Jun 18, 2:06 AM CDT	TSTM WND GST 60	4 Nnw Ankeny Airport, IA
Jun 18, 2:08 AM CDT	TSTM WND DMG	Ankeny, IA	MULTIPLE TWO TO THREE INCH TREE BRANCHES DOWN ACROSS TOWN...SOME UP TO FOUR TO SIX INCHES. BRIEF POWER OUTAGES. SEVERAL AREAS OF STREET FLOODING.
Jun 18, 2:08 AM CDT	TSTM WND GST 60	4 Nnw Ankeny Airport, IA
Jun 18, 2:08 AM CDT	TSTM WND GST 65	5 N Ankeny Airport, IA
Jun 18, 2:10 AM CDT	TSTM WND DMG	1 Ne Bondurant, IA	POLK COUNTY LAW ENFORCEMENT REPORTS ROOF BLOWN OFF HOUSE AND BARN AT 2ND ST NE AND NE 80TH ST JUST EAST OF BONDURANT. DELAYED REPORT. TIME ESTIMATED.
Jun 18, 2:13 AM CDT	TSTM WND GST 59	2 Ne Des Moines, IA
Jun 18, 2:14 AM CDT	TSTM WND GST 74	Ankeny, IA	RWIS INSTRUMENT IN ANKENY RECORDED A GUST TO 64 KT/ 74 MPH AT 213 AM

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 21 storm reports to this severe thunderstorm warning; the first came 1 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 17, 11:53 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.7 hours before the alert went out and 234 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: 1256 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1892 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KDMX 180641
SVRDMX
IAC015-049-153-169-180730-
/O.NEW.KDMX.SV.W.0079.090618T0641Z-090618T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
141 AM CDT THU JUN 18 2009

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BOONE COUNTY IN CENTRAL IOWA...
  NORTHEASTERN DALLAS COUNTY IN CENTRAL IOWA...
  POLK COUNTY IN CENTRAL IOWA...
  SOUTHERN STORY COUNTY IN CENTRAL IOWA...

* UNTIL 230 AM CDT

* AT 140 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 70 MPH. THIS STORM WAS LOCATED 4 MILES NORTH OF WOODWARD...OR 29
  MILES NORTHWEST OF DES MOINES...AND WAS MOVING SOUTHEAST AT 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MADRID...GRANGER AND KELLEY BY 150 AM CDT...
  SHELDAHL...POLK CITY...SLATER AND SAYLORVILLE LAKE BY 155 AM CDT...
  ALLEMAN...ANKENY AND JOHNSTON BY 200 AM CDT...


PRECAUTIONARY/PREPAREDNESS ACTIONS...

YOU ARE IN DANGER IN THE PATH OF THIS STORM GO TO A BASEMENT OR
SMALL INTERIOR ROOM. EXTENSIVE DAMAGE IS LIKELY. EVACUATE MOBILE
HOMES...AND SEEK SHELTER IN A STURDY BUILDING. WIDESPREAD DESTRUCTIVE
WINDS CAN PRODUCE DAMAGE SIMILAR TO A TORNADO.

&&

LAT...LON 4182 9413 4208 9396 4195 9335 4160 9336
      4160 9334 4149 9333 4149 9335
TIME...MOT...LOC 0642Z 298DEG 51KT 4190 9392

$$

DONAVON

3 follow-up statements

000 
WWUS53 KDMX 180701
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
201 AM CDT THU JUN 18 2009

IAC015-049-153-169-180730-
/O.CON.KDMX.SV.W.0079.000000T0000Z-090618T0730Z/
BOONE IA-STORY IA-POLK IA-DALLAS IA-
201 AM CDT THU JUN 18 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR NORTHEASTERN DALLAS...POLK...SOUTHERN STORY AND SOUTHEASTERN
BOONE COUNTIES...

AT 159 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR ALLEMAN...OR 14 MILES
NORTH OF DES MOINES...MOVING SOUTHEAST AT 60 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BONDURANT...ALTOONA AND PLEASANT HILL BY 210 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION GO TO THE BASEMENT OR AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL
TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE FROM POLK CITY TO 
MADRID...WITH 60 TO 70 MPH WINDS AND LARGE TREE LIMBS DOWN.

&&

LAT...LON 4175 9391 4203 9371 4195 9335 4160 9336
      4160 9334 4149 9333 4149 9335
TIME...MOT...LOC 0701Z 298DEG 51KT 4177 9360

$$

DONAVON

000 
WWUS53 KDMX 180714
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
214 AM CDT THU JUN 18 2009

IAC015-049-180724-
/O.CAN.KDMX.SV.W.0079.000000T0000Z-090618T0730Z/
BOONE IA-DALLAS IA-
214 AM CDT THU JUN 18 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DALLAS AND
SOUTHEASTERN BOONE COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.

LAT...LON 4169 9377 4198 9353 4195 9335 4160 9336
      4160 9334 4149 9333 4149 9335
TIME...MOT...LOC 0714Z 298DEG 51KT 4168 9338

$$

IAC153-169-180730-
/O.CON.KDMX.SV.W.0079.000000T0000Z-090618T0730Z/
STORY IA-POLK IA-
214 AM CDT THU JUN 18 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR POLK AND SOUTHERN STORY COUNTIES...

AT 212 AM CDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING DAMAGING WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED
NEAR BONDURANT...OR 13 MILES NORTHEAST OF DES MOINES...MOVING
SOUTHEAST AT 60 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION GO TO THE BASEMENT OR AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL
TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
POLK AND STORY COUNTIES. THIS IS AN EXTREMELY DANGEROUS SITUATION.

&&

LAT...LON 4169 9377 4198 9353 4195 9335 4160 9336
      4160 9334 4149 9333 4149 9335
TIME...MOT...LOC 0714Z 298DEG 51KT 4168 9338

$$

DONAVON

000 
WWUS53 KDMX 180729
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
229 AM CDT THU JUN 18 2009

IAC153-169-180739-
/O.EXP.KDMX.SV.W.0079.000000T0000Z-090618T0730Z/
STORY IA-POLK IA-
229 AM CDT THU JUN 18 2009

...THE SEVERE THUNDERSTORM WARNING FOR POLK AND SOUTHERN STORY
COUNTIES EXPIRES AT 230 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 6 AM.

LAT...LON 4169 9377 4198 9353 4195 9335 4160 9336
      4160 9334 4149 9333 4149 9335
TIME...MOT...LOC 0729Z 298DEG 51KT 4158 9313

$$

DONAVON

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 18, 1:05 AM CDT, 36 minutes earlier.

Area forecast discussion, Jun 18, 1:05 AM CDT, 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
105 AM CDT THU JUN 18 2009

...UPDATED AVIATION FORECAST...

.SHORT TERM.../TONIGHT/
TRICKY SCENARIO SHAPING UP TONIGHT ACROSS THE AREA...WITH ATMOSPHERE
QUITE UNSTABLE AND A COUPLE OF BOUNDARIES ACROSS/NEAR THE AREA.
MODERATE RISK OF SEVERE WEATHER CONTINUES ACROSS AREA WHERE WATCH
ALREADY IN PLACE...BUT ONGOING DEVELOPMENT CONTINUES TO TRACK MORE
EAST SOUTHEAST AND MAY MISS/SKIRT SOUTHWEST/SOUTH CENTRAL IOWA.
POTENTIAL FOR FURTHER DEVELOPMENT OVER THE NEXT FEW HOURS IN THAT
AREA STILL...SO WILL CONTINUE WITH THE WATCH FOR NOW. NEXT PUSH OF
ENERGY MOVING INTO WRN/CNTRL NE AND MAY SET OFF SECONDARY AROUND OF
CONVECTION WHICH IS POISED TO MOVE THROUGH SOUTHERN CWA LATE THIS
EVENING INTO THE OVERNIGHT WITH DAMAGING WIND STILL THE MAIN SEVERE
THREAT.

OTHERWISE BOUNDARY IN PLACE ACROSS CENTRAL/NORTH CENTRAL CWA AS
WELL...WITH SPC MESOANALYSIS INDICATING DESTABILIZATION ALREADY IN
PROGRESS. LOOKS LIKE COULD GET SOME INITIAL DEVELOPMENT WITHIN THE
NEXT FEW HOURS ALONG THE FRONTAL BOUNDARY IN PLACE. POTENTIAL COULD
ALSO LEAD TO HAVING TO WAIT FOR UPSTREAM ENERGY TO GET ANYTHING
GOING UNTIL LATE THIS EVENING...BUT THEN SOUNDINGS INDICATE MORE
ELEVATED ACTIVITY LIMITING THE SEVERE THREAT AT THIS TIME. EITHER
WAY MOISTURE ON THE INCREASE...AND TO REMAIN ACROSS THE AREA
LIMITING OVERNIGHT TEMPS FROM COOLING OFF TOO MUCH AS DEWPOINTS
EXPECTED TO REMAIN IN THE UPPER 60S TO LOWER 70S ACROSS THE AREA
WITH MOISTURE ADVECTION POINTED DIRECTLY INTO CENTRAL CWA OVERNIGHT.

.LONG TERM.../THURSDAY THROUGH TUESDAY/
WILL SEE ACTIVE WX PERSIST INTO THURSDAY AS FRONTAL BOUNDARY LIFTS
NORTH THROUGH THE STATE.  WL LIKELY SEE THE CAP ACRS SOUTHERN IA
ENDING TSRA DURING THE MORNING...HOWEVER WL SEE STRONG INSTABILITY
AND EDGE OF CAP IN NORTHERN IA AND WL LIKELY SEE SEVERE STORMS BY
LATE AFTERNOON OR EVENING WITH PEAK HEATING.  GIVEN THE SUFFICIENT
SHEAR AND NEARBY TRIPLE POINT...MAY SEE DECENT TORNADO THREAT BY MID
TO LATE AFTERNOON ACRS NORTH CENTRAL AND NORTHWEST AREAS OF IOWA.
MOST CONVECTION WL REMAIN ACRS THE NORTH THURSDAY NIGHT...BUT MAY
BEGIN TO SPREAD SOUTHWARD OVERNIGHT AS BOUNDARY SLIPS INTO THE
STATE.  NEXT ROUND OF STORMS EXPECTED ON FRIDAY WITH FINAL SHORTWAVE
PASSING THROUGH THE STATE.  ANOTHER ROUND OF SEVERE WEATHER IS
LIKELY WITH THIS SYSTEM PRIOR TO SHORTWAVE PASSAGE WITH PCPN ENDING
FROM WEST TO EAST ON LATE FRIDAY INTO FRIDAY NIGHT.  WARMEST
TEMPERATURES OF THE SEASON ARE EXPECTED ON THURSDAY WITH THERMAL
RIDGE AND CAP IN PLACE ACRS THE SOUTH ALLOWING READINGS INTO THE
LOWER 90S THERE. WL SEE SOME QUIET WEATHER ON SATURDAY WITH RIDGING
PASSING THROUGH THE AREA...HOWEVER WL BEGIN TO SEE RETURN OF HEAT ON
MOISTURE ON SUNDAY WITH THE THREAT OF CONVECTION BEGINNING BY SUNDAY
AFTERNOON.  AFTER THAT POINT...TIMING AND PLACEMENT OF TSRA CHANCES
BECOMES QUITE DIFFICULT AS MEDIUM RANGE MODELS DEPART FROM ONE
ANOTHER.  HOWEVER...IT DOES APPEAR THAT MUCH MORE SUMMER LIKE
TEMPERATURES WILL BE IN STORE WITH READINGS AT OR ABOVE NORMAL FOR
NEXT WEEK.

&&

.AVIATION...18/06Z
MOIST AND UNSTABLE AIRMASS IN PLACE OVER IOWA.  SEVERAL CLUSTERS OF
STORMS APPROACHING THE TAF SITES THUS PERIODS OF STORMS WILL PERSIST
THROUGH 12Z.  ADDITIONAL DEVELOPMENT WILL OCCUR OVER TAF LOCATIONS
AFT 22Z AS A FRONTAL BOUNDARY RE-ESTABLISHES ITSELF ACROSS CENTRAL
IOWA. MVFR CONDITIONS IN THUNDERSTORMS OTHERWISE VFR CIGS ARE
FORECAST.

&&

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

&&

AVIATION/SHORT TERM...FAB
LONG TERM...COGIL

Hazardous weather outlook, Jun 17, 10:49 PM CDT, 2 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1049 PM CDT WED JUN 17 2009

IAZ004-015-023-033>037-044>048-057>060-070>073-190400-
EMMET-PALO ALTO-POCAHONTAS-SAC-CALHOUN-WEBSTER-HAMILTON-HARDIN-
CRAWFORD-CARROLL-GREENE-BOONE-STORY-AUDUBON-GUTHRIE-DALLAS-POLK-
CASS-ADAIR-MADISON-WARREN-
1049 PM CDT WED JUN 17 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL IOWA
MAINLY WEST OF INTERSTATE 35 AND NORTH OF INTERSTATE 80.

.DAY ONE...TONIGHT

THUNDERSTORMS ARE EXPECTED THROUGH THE OVERNIGHT HOURS. SOME
STORMS WILL BE SEVERE WITH FREQUENT AND DANGEROUS LIGHTNING...
LARGE HAIL TO THE SIZE OF GOLF BALLS AND DAMAGING WIND ALONG WITH
HEAVY RAINFALL. ISOLATED RAINFALL AMOUNTS OF AS MUCH AS TWO
INCHES IS POSSIBLE WHICH COULD LEAD TO FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CHANCES FOR THUNDERSTORMS CONTINUE OFF AND ON RIGHT INTO FRIDAY.
THE POTENTIAL FOR SEVERE WEATHER PERSISTS AS WELL WITH LARGE
HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES STILL POSSIBLE.  LOCALLY
HEAVY...AND POTENTIALLY FLOODING RAINFALL MAY STILL ACCOMPANY THE
STRONGER STORMS.

MINIMAL CHANCES FOR THUNDERSTORMS RETURN TO THE FORECAST LATE
SUNDAY AND AGAIN MONDAY NIGHT...BUT THE SEVERE WEATHER POTENTIAL
IS LOW FOR THE TIME BEING.

.SPOTTER INFORMATION STATEMENT...

SEVERAL INSTANCES OF SPOTTER ACTIVATION MAY BE NEEDED THROUGH
FRIDAY. REPORTS OF HEAVY RAINS OR FLOODING ARE ALSO ENCOURAGED AND
APPRECIATED...EVEN OUTSIDE OF ACTIVATIONS FOR SEVERE WEATHER.

IAZ005>007-016-017-024>028-190400-
KOSSUTH-WINNEBAGO-WORTH-HANCOCK-CERRO GORDO-HUMBOLDT-WRIGHT-
FRANKLIN-BUTLER-BREMER-
1049 PM CDT WED JUN 17 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL IOWA
MAINLY NORTH OF HIGHWAY 20 AND EAST OF HIGHWAY 169.

.DAY ONE...TONIGHT

THUNDERSTORMS ARE EXPECTED THROUGH THE OVERNIGHT HOURS. SOME
STORMS WILL BE SEVERE WITH FREQUENT LIGHTNING...LARGE HAIL UP TO
THE SIZE OF GOLF BALLS...HEAVY RAINFALL AND DAMAGING WIND. ISOLATED
TORNADOES ARE ALSO POSSIBLE INTO THE EARLY MORNING HOURS. LOCAL
RAINFALL AMOUNTS OF UP TO TWO INCHES IS POSSIBLE WHICH COULD LEAD
TO FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CHANCES FOR THUNDERSTORMS CONTINUE OFF AND ON RIGHT INTO FRIDAY.
THE POTENTIAL FOR SEVERE WEATHER PERSISTS AS WELL WITH LARGE
HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES STILL POSSIBLE.  LOCALLY
HEAVY...AND POTENTIALLY FLOODING RAINS MAY STILL ACCOMPANY THE
STRONGER STORMS.

MINIMAL CHANCES FOR THUNDERSTORMS RETURN TO THE FORECAST LATE
SUNDAY AND AGAIN MONDAY NIGHT...BUT THE SEVERE WEATHER POTENTIAL
IS LOW FOR THE TIME BEING.

.SPOTTER INFORMATION STATEMENT...

SEVERAL INSTANCES OF SPOTTER ACTIVATION MAY BE NEEDED THROUGH
FRIDAY. REPORTS OF HEAVY RAINS OR FLOODING ARE ALSO ENCOURAGED AND
APPRECIATED...EVEN OUTSIDE OF ACTIVATIONS FOR SEVERE WEATHER.

IAZ038-039-049-050-061-062-074-075-081>086-092>097-190400-
GRUNDY-BLACK HAWK-MARSHALL-TAMA-JASPER-POWESHIEK-MARION-MAHASKA-
ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-
WAYNE-APPANOOSE-DAVIS-
1049 PM CDT WED JUN 17 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A PORTION OF CENTRAL IOWA
MAINLY EAST OF INTERSTATE 35.

.DAY ONE...TONIGHT

THUNDERSTORMS ARE EXPECTED OVERNIGHT. SOME OF THE STORMS WILL BE
SEVERE WITH FREQUENT AND DANGEROUS LIGHTNING...LARGE HAIL UP TO
THE SIZE OF GOLF BALLS AND DAMAGING WIND.  LOCAL RAINFALL AMOUNTS
OF UP TO TWO INCHES IS POSSIBLE WHICH COULD LEAD TO FLASH
FLOODING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CHANCES FOR THUNDERSTORMS CONTINUE OFF AND ON RIGHT INTO FRIDAY.
THE POTENTIAL FOR SEVERE WEATHER PERSISTS AS WELL WITH LARGE
HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES STILL POSSIBLE.  LOCALLY
HEAVY...AND POTENTIALLY FLOODING RAINS MAY STILL ACCOMPANY THE
STRONGER STORMS.

MINIMAL CHANCES FOR THUNDERSTORMS RETURN TO THE FORECAST LATE
SUNDAY AND AGAIN MONDAY NIGHT...BUT THE SEVERE WEATHER POTENTIAL
IS LOW FOR THE TIME BEING.

.SPOTTER INFORMATION STATEMENT...

SEVERAL INSTANCES OF SPOTTER ACTIVATION MAY BE NEEDED THROUGH
FRIDAY. REPORTS OF HEAVY RAINS OR FLOODING ARE ALSO ENCOURAGED AND
APPRECIATED...EVEN OUTSIDE OF ACTIVATIONS FOR SEVERE WEATHER.

FAB

In the hours before

Local storm report, Jun 18, 12:25 AM CDT, 1 hour 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1225 AM CDT THU JUN 18 2009

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

1210 AM     HAIL             1 NW EAST PERU          41.24N 93.94W
06/18/2009  E1.75 INCH       MADISON            IA   LAW ENFORCEMENT

            MADISON COUNTY LAW ENFORCEMENT REPORTED GOLF BALL HAIL
            JUST NORTHWEST OF EAST PERU

1210 AM     TSTM WND GST     1 NW EAST PERU          41.24N 93.94W
06/18/2009  E65 MPH          MADISON            IA   LAW ENFORCEMENT

            MADISON COUNTY LAW ENFORCEMENT REPORTED ESTIMATED 65 MPH
            WIND GUSTS JUST NORTHWEST OF EAST PERU

1210 AM     TSTM WND DMG     1 SE EAST PERU          41.21N 93.91W
06/18/2009                   MADISON            IA   LAW ENFORCEMENT

            MADISON COUNTY LAW ENFORCEMENT REPORTED TREES BLOWN DOWN
            OVER THE ROAD AT 3010 RUSTIC AVENUE

1216 AM     FUNNEL CLOUD     4 WSW EAST PERU         41.20N 94.00W
06/18/2009                   MADISON            IA   LAW ENFORCEMENT

            MADISON COUNTY LAW ENFORCEMENT REPORTED A FUNNEL CLOUD
            NEAR THE INTERSECTION OF MILLSTREAM AVENUE AND 305TH
            STREET

&&

LEE

Local storm report, Jun 18, 12:40 AM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1240 AM CDT THU JUN 18 2009

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

1225 AM     HAIL             TRURO                   41.21N 93.85W
06/18/2009  E1.75 INCH       MADISON            IA   AMATEUR RADIO

            AMATEUR RADIO OPERATOR REPORTED GOLF BALL SIZED HAIL IN
            TRURO

&&

LEE

Local storm report, Jun 18, 12:59 AM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1259 AM CDT THU JUN 18 2009

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

1258 AM     HAIL             LIDDERDALE              42.12N 94.78W
06/18/2009  E1.00 INCH       CARROLL            IA   LAW ENFORCEMENT

&&

JH

Local storm report, Jun 18, 1:05 AM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
105 AM CDT THU JUN 18 2009

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

1205 AM     TSTM WND DMG     1 SE EAST PERU          41.21N 93.91W
06/18/2009                   MADISON            IA   STORM CHASER

            SEVERAL LARGE TREE BRANCHES DOWN AT INTERSECTION OF G68
            AND R21. TIME ESTIMATED.

&&

SMALL

Local storm report, Jun 18, 1:38 AM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
138 AM CDT THU JUN 18 2009

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

0133 AM     TSTM WND GST     BEACON                  41.27N 92.68W
06/18/2009  E0 MPH           MAHASKA            IA   TRAINED SPOTTER

            SPOTTER ESTIMATES A BRIEF 50 TO 55 MPH WIND GUST.

&&

JH

Local storm report, Jun 18, 1:39 AM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DES MOINES IA
139 AM CDT THU JUN 18 2009

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

0133 AM     TSTM WND GST     1 WNW OSKALOOSA         41.27N 92.68W
06/18/2009  E55.00 MPH       MAHASKA            IA   TRAINED SPOTTER

            SPOTTER ESTIMATES A BRIEF 50 TO 55 MPH WIND GUST.

&&

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 9:30 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	45 min
Jun 17, 10:04 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison, Union	41 min
Jun 17, 10:15 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	45 min
Jun 17, 10:38 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk, Warren	37 min
Jun 17, 10:43 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	32 min
Jun 17, 10:46 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison	44 min
Jun 17, 10:59 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie, Madison	46 min
Jun 17, 11:07 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	41 min
Jun 17, 11:14 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	46 min
Jun 17, 11:27 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Madison	48 min
Jun 17, 11:55 PM CDT	Tornado Warning	DMX	Clarke, Madison, Warren	35 min
Jun 18, 12:00 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Sac	45 min
Jun 18, 12:12 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Warren	48 min
Jun 18, 12:17 AM CDT	Severe Thunderstorm Warning	DMX	Crawford, Sac	37 min
Jun 18, 12:21 AM CDT	Areal Flood Advisory	DMX	Calhoun, Carroll, Crawford, Sac	3 hr
Jun 18, 12:31 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas	29 min
Jun 18, 12:35 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Monroe, Warren, Wayne	40 min
Jun 18, 12:43 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene, Guthrie, Sac	47 min
Jun 18, 12:59 AM CDT	Tornado Warning	DMX	Lucas, Wayne	31 min
Jun 18, 1:18 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Mahaska, Marion, Monroe, Wapello	42 min
Jun 18, 1:44 AM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	46 min
Jun 18, 2:07 AM CDT	Severe Thunderstorm Warning	DMX	Polk, Warren	23 min
Jun 18, 2:11 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion	39 min
Jun 18, 2:24 AM CDT	Severe Thunderstorm Warning	DMX	Monroe, Wapello	51 min
Jun 18, 2:32 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Monroe, Warren	28 min
Jun 18, 5:54 AM CDT	River Flood Warning	DMX	Mahaska, Marion	5 days
Jun 18, 7:24 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Humboldt, Pocahontas, Webster	36 min
Jun 18, 7:34 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac, Webster	41 min
Jun 18, 7:39 AM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Kossuth, Palo Alto, Pocahontas	36 min
Jun 18, 8:03 AM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Humboldt, Webster, Wright	42 min
Jun 18, 9:05 AM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Story	25 min
Jun 18, 10:49 AM CDT	River Flood Warning	DMX	Mahaska, Marion	10 hr
Jun 18, 12:35 PM CDT	River Flood Warning	DMX	Wapello	11 hr
Jun 18, 1:34 PM CDT	River Flood Warning	DMX	Wapello	5 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.