Alert archive / Iowa / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 56, NWS Des Moines, IA

April 27, 20146 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 27, 2014, 2:59 PM CDT for 6 counties in Iowa. It was in force for 61 min. 17 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: Apr 27, 2014, 2:59 PM CDT (19:59 UTC)
Expired: Apr 27, 2014, 4:00 PM CDT
In force: 61 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Appanoose County, IA, Davis County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Wapello County, IA

The radar

The Des Moines radar (KDMX), 121 km from the middle of the area, began a volume at 20:01 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
Apr 27, 3:00 PM CDT	TORNADO	1 N Floris, IA	OBSERVER SAW A BRIEF TOUCHDOWN IN A FIELD. THERE WAS NO DAMAGE.
Apr 27, 3:00 PM CDT	TORNADO	Lovilia, IA	TORNADO TOUCHDOWN OBSERVED. HOUSE ROOFS TORN OFF. TREES SNAPPED OFF.
Apr 27, 3:05 PM CDT	FUNNEL CLOUD	3 W Ottumwa, IA	FUNNEL CLOUD...PEA SIZED HAIL AND HEAVY RAIN
Apr 27, 3:06 PM CDT	TSTM WND DMG	6 Wsw Ottumwa, IA	MAJOR STRUCTURAL DAMAGE TO AT LEAST ONE FARMSTEAD. ROOFS BLOWN OFF OUTBUILDINGS. ROOF DAMAGE TO THE HOUSE AND THE PORCH ON THE HOUSE DESTROYED. MANY 12-18 INCH TREES SNAPPED. POSSIBLE TORNADO BASED ON RADAR DATA. TIME ESTIMATED BASED ON RADAR.
Apr 27, 3:08 PM CDT	TSTM WND GST 70	Blakesburg, IA	REPORTED BY BLAKESBURG FIRE DEPT. RELAYED BY FAIRFIELD WARNING POINT ON NAWAS.
Apr 27, 3:10 PM CDT	FUNNEL CLOUD	1 N Floris, IA	TRAINED SPOTTER REPORTED DIRT LIFTING UP SEVERAL FEET AND ROTATING RIGHT OVERHEAD.
Apr 27, 3:10 PM CDT	TSTM WND DMG	1 W Udell, IA	* 1 INJ * TIME ESTIMATED FROM RADAR
Apr 27, 3:10 PM CDT	TSTM WND DMG	2 S Ottumwa, IA	THUNDERSTORM WIND DAMAGE IN THE 1000 BLOCK OF WEST MARY ST. IN OTTUMWA. TWO FEET DIAMETER TREES BLOWN OVER, FLAG POLES BENT IN HALF, AND A GRAIN BIN ROOF REMOVED AND BLOWN APPROX. 200 YARDS. TIME ESTIMATED FROM RADAR.
Apr 27, 3:10 PM CDT	TSTM WND DMG	3 S Udell, IA	SEVERAL OUTBUILDINGS DAMAGED OR DESTROYED. CARPORTS OVERTURNED. SEVERAL TREES OF 12-15 INCHES IN DIAMETER SNAPPED OFF AT OR NEAR GROUND. POWER LINES DOWN. CATTLE TRAPPED IN A POLE BARN IN THE VICINITY. POSSIBLE TORNADO BASED ON RADAR DATA. TIME ESTIMATED BASED
Apr 27, 3:12 PM CDT	TSTM WND GST 60	1 Sw Ottumwa, IA
Apr 27, 3:12 PM CDT	TORNADO	1 N Floris, IA	OBSERVER REPORTS GUSTNADO AT 312 PM JUST AHEAD OF STORM ARRIVAL. DIRT KICKED UP IN FIELD PRIOR TO HEAVY RAIN.
Apr 27, 3:16 PM CDT	TSTM WND GST 60	4 S Floris, IA
Apr 27, 3:20 PM CDT	TSTM WND DMG	Oskaloosa, IA	MANY TREES DOWN. DIAMETER UP TO 24 INCHES. DELAYED REPORT.
Apr 27, 3:20 PM CDT	TSTM WND GST 59	4 Se Kirkville, IA	REPORTED AT OTTUMWA REGIONAL AIRPORT.
Apr 27, 3:20 PM CDT	TORNADO	7 E Ottumwa Airport, IA	BROAD CIRCULATION TIGHTENED AS TORNADO RACED NORTHEAST ACROSS NORTHERN WAPELLO COUNTY. DESTROYED A CHICKEN BARN AND SNAPPED POWER POLES NEAR INITIAL TOUCHDOWN. BEFORE CROSSING INTO KEOKUK COUNTY...CAUSED SIGNIFICANT LEAN TO LARGER UTILITY POLES.
Apr 27, 3:30 PM CDT	TSTM WND DMG	1 Ne Oskaloosa, IA	ROOF TAKEN OFF OF OSKALOOSA FAMILY MEDICAL CENTER. TIME ESTIMATED.
Apr 27, 3:45 PM CDT	HAIL 1	1 Ne Ottumwa, IA	ALSO REPORTED WIND DAMAGE WITH BRANCHES DOWN. NEW STORM DAMAGE SUBMISSION FORM.

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 11 storm reports to this severe thunderstorm warning; the first came 7 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
Apr 27, 11:23 AM CDT	Tornado Watch	SPC	8 hr
Apr 27, 2:13 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.0 hours before the alert went out and 187 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1230 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 467 m²/s²
0-3 km storm-relative helicity: 555 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

906 
WUUS53 KDMX 271959
SVRDMX
IAC007-051-123-125-135-179-272100-
/O.NEW.KDMX.SV.W.0056.140427T1959Z-140427T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
259 PM CDT SUN APR 27 2014

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DAVIS COUNTY IN SOUTHEAST IOWA...
  EASTERN MARION COUNTY IN SOUTH CENTRAL IOWA...
  MAHASKA COUNTY IN SOUTH CENTRAL IOWA...
  MONROE COUNTY IN SOUTH CENTRAL IOWA...
  EASTERN APPANOOSE COUNTY IN SOUTH CENTRAL IOWA...
  WAPELLO COUNTY IN SOUTHEAST IOWA...

* UNTIL 400 PM CDT

* AT 259 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 12 MILES SOUTHEAST OF KNOXVILLE TO NEAR LANCASTER...
  MOVING NORTHEAST AT 45 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  OTTUMWA...OSKALOOSA...PELLA...KNOXVILLE...ALBIA...BLOOMFIELD...NEW
  SHARON...EDDYVILLE...LAKE RED ROCK...OTTUMWA INDUSTRIAL AIRPORT...
  LAKE SUNDOWN...RATHBUN LAKE...ELDON...FREMONT...MORAVIA...AGENCY...
  MOULTON...LOVILIA...BEACON AND UNIVERSITY PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT SUNDAY EVENING FOR
SOUTHWEST IOWA.

LAT...LON 4059 9274 4116 9309 4151 9304 4151 9241
      4117 9241 4116 9218 4060 9219
TIME...MOT...LOC 1959Z 224DEG 38KT 4118 9294 4058 9253 

HAIL...1.00IN
WIND...60MPH

$$

COGIL

4 follow-up statements

560 
WWUS53 KDMX 272014
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
314 PM CDT SUN APR 27 2014

IAC007-051-123-125-135-179-272100-
/O.CON.KDMX.SV.W.0056.000000T0000Z-140427T2100Z/
DAVIS IA-MARION IA-MAHASKA IA-MONROE IA-APPANOOSE IA-WAPELLO IA-
314 PM CDT SUN APR 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR DAVIS...EASTERN MARION...MAHASKA...EASTERN MONROE...NORTHEASTERN
APPANOOSE AND WAPELLO COUNTIES...

AT 314 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM NEAR OSKALOOSA TO NEAR OTTUMWA TO 9 MILES NORTH OF
DOWNING...MOVING NORTHEAST AT 60 MPH.

HAZARD...70 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...TRAINED WEATHER SPOTTERS. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT CONSIDERABLE 
         TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO MOBILE 
         HOMES...ROOFS AND OUTBUILDINGS. 

LOCATIONS IMPACTED INCLUDE...
OTTUMWA...OSKALOOSA...PELLA...ALBIA...BLOOMFIELD...NEW SHARON...
EDDYVILLE...OTTUMWA INDUSTRIAL AIRPORT...LAKE SUNDOWN...LAKE RED
ROCK...ELDON...FREMONT...MORAVIA...AGENCY...MOULTON...LOVILIA...
BEACON...UNIVERSITY PARK...BUSSEY AND BLAKESBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT SUNDAY EVENING FOR
SOUTHWEST IOWA.

LAT...LON 4059 9264 4117 9300 4151 9304 4151 9241
      4117 9241 4116 9218 4060 9219
TIME...MOT...LOC 2014Z 226DEG 51KT 4129 9272 4099 9244 4061 9232 

HAIL...1.00IN
WIND...70MPH

$$

COGIL

807 
WWUS53 KDMX 272024
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
324 PM CDT SUN APR 27 2014

IAC007-272034-
/O.CAN.KDMX.SV.W.0056.000000T0000Z-140427T2100Z/
APPANOOSE IA-

324 PM CDT SUN APR 27 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN APPANOOSE COUNTY
IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT SUNDAY EVENING FOR
SOUTHWEST IOWA.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY
EVENING FOR SOUTHEAST IOWA.

LAT...LON 4106 9270 4150 9303 4151 9241 4117 9241
      4116 9218 4060 9219 4060 9255
TIME...MOT...LOC 2024Z 226DEG 51KT 4138 9259 4108 9232 4070 9220 

$$

IAC051-123-125-135-179-272100-
/O.CON.KDMX.SV.W.0056.000000T0000Z-140427T2100Z/
DAVIS IA-MARION IA-MAHASKA IA-MONROE IA-WAPELLO IA-
324 PM CDT SUN APR 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR DAVIS...NORTHEASTERN MARION...MAHASKA...NORTHEASTERN MONROE AND
WAPELLO COUNTIES...

AT 324 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 6 MILES NORTHEAST OF OSKALOOSA TO 6 MILES SOUTH OF
HEDRICK TO NEAR MILTON...MOVING NORTHEAST AT 60 MPH.

HAZARD...70 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...TRAINED WEATHER SPOTTERS. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT CONSIDERABLE 
         TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO MOBILE 
         HOMES...ROOFS AND OUTBUILDINGS. 

LOCATIONS IMPACTED INCLUDE...
OTTUMWA...OSKALOOSA...PELLA...BLOOMFIELD...NEW SHARON...EDDYVILLE...
OTTUMWA INDUSTRIAL AIRPORT...ELDON...FREMONT...AGENCY...BEACON...
UNIVERSITY PARK...BLAKESBURG...PULASKI...DRAKESVILLE...BARNES CITY...
ROSE HILL...KIRKVILLE...LEIGHTON AND FLORIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT SUNDAY EVENING FOR
SOUTHWEST IOWA.

LAT...LON 4106 9270 4150 9303 4151 9241 4117 9241
      4116 9218 4060 9219 4060 9255
TIME...MOT...LOC 2024Z 226DEG 51KT 4138 9259 4108 9232 4070 9220 

HAIL...1.00IN
WIND...70MPH

$$

COGIL

700 
WWUS53 KDMX 272033
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
333 PM CDT SUN APR 27 2014

IAC125-135-272043-
/O.CAN.KDMX.SV.W.0056.000000T0000Z-140427T2100Z/
MARION IA-MONROE IA-

333 PM CDT SUN APR 27 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MARION AND
NORTHEASTERN MONROE COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.  THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY
EVENING FOR SOUTHEAST IOWA.

LAT...LON 4108 9250 4150 9278 4151 9241 4117 9241
      4116 9218 4060 9219 4060 9240
TIME...MOT...LOC 2033Z 228DEG 45KT 4142 9254 4112 9227 4074 9215 

$$

IAC051-123-179-272100-
/O.CON.KDMX.SV.W.0056.000000T0000Z-140427T2100Z/
DAVIS IA-MAHASKA IA-WAPELLO IA-
333 PM CDT SUN APR 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR EASTERN DAVIS...EASTERN MAHASKA AND WAPELLO COUNTIES...

AT 333 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 6 MILES SOUTHEAST OF NEW SHARON TO NEAR HEDRICK TO
NEAR MILTON...MOVING NORTHEAST AT 50 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...TRAINED WEATHER SPOTTERS. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING AND TREES. 

LOCATIONS IMPACTED INCLUDE...
OTTUMWA...OSKALOOSA...BLOOMFIELD...NEW SHARON...OTTUMWA INDUSTRIAL
AIRPORT...ELDON...FREMONT...AGENCY...UNIVERSITY PARK...PULASKI...
BARNES CITY...ROSE HILL...KIRKVILLE...FLORIS...KEOMAH VILLAGE...
OSKALOOSA MUNICIPAL AIRPORT...LAKE KEOMAH STATE PARK AND BLOOMFIELD
MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4108 9250 4150 9278 4151 9241 4117 9241
      4116 9218 4060 9219 4060 9240
TIME...MOT...LOC 2033Z 228DEG 45KT 4142 9254 4112 9227 4074 9215 

HAIL...1.00IN
WIND...60MPH

$$

COGIL

263 
WWUS53 KDMX 272050
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
350 PM CDT SUN APR 27 2014

IAC051-123-179-272100-
/O.EXP.KDMX.SV.W.0056.000000T0000Z-140427T2100Z/
DAVIS IA-MAHASKA IA-WAPELLO IA-
350 PM CDT SUN APR 27 2014

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN DAVIS...EASTERN
MAHASKA AND WAPELLO COUNTIES WILL EXPIRE AT 400 PM CDT...
    
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
AREA. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY
EVENING FOR SOUTHEAST IOWA.

LAT...LON 4108 9250 4150 9278 4151 9241 4117 9241
      4116 9218 4060 9219 4060 9240
TIME...MOT...LOC 2046Z 224DEG 38KT 4142 9254 4112 9227 4074 9215 

$$

COGIL

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 Apr 27, 12:35 PM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Apr 27, 12:35 PM CDT, 2 hours 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
1235 PM CDT SUN APR 27 2014

.SHORT TERM /TODAY/...
ISSUED AT 359 AM CDT SUN APR 27 2014

SEVERE WEATHER POTENTIAL WILL BE PRIMARY CONCERN TODAY WITH
CONDITIONALITY OF EVENT SEEMING TO DIMINISH WITH TIME. CURRENT
NARROW RIBBON OF ELEVATED CONVECTION ROOTED 2-3KM AND DRIVEN BY
STRONG WARM/THETA-E ADVECTION ZONE WILL CONTINUE TO LIFT NORTH AND
EAST OUT OF THE AREA EARLY THIS MORNING. 3HR MUCAPE CHANGES
SUGGEST THAT AIRMASS ALOFT IS BECOMING INCREASINGLY UNSTABLE AS
INSTABILITY SURGES NORTHWARD SO...WHILE STORMS HAVE REMAINED BELOW
SEVERE LIMITS OVERNIGHT AND EFFECTIVE SHEAR IS MINIMAL...WOULD NOT
BE SURPRISED TO SEE A FEW NUDGE ABOVE SEVERE BEFORE EXITING
FORECAST AREA.

ATTENTION THEN TURNS TO THE SOUTH AND WEST TOWARD APPROACHING PARENT
LONG WAVE TROUGH AND ASSOCIATED POTENT SHORT WAVE/PV ANOMALY.  BROAD
WEAK/MODERATE QG FORCING AND UPPER LEVEL DIFFLUENCE IS ALREADY IN
PLACE ACROSS THE MO VALLEY SO COULD SEE PRECURSOR CONVECTION DEVELOP
AHEAD OF MAIN EVENT AT ANY TIME BEHIND EXITING THERMODYNAMIC ZONE.
PRIMARY FOCUS WILL BE ON THE AFTERNOON HOURS. PV ANOMALY SHOULD BE
OVER KS BY 18Z WITH DRY SLOT AND ATTENDANT LOBE OF FORCING LIFTING
INTO SWRN IA. THIS MECHANICAL FORCING SHOULD HAVE NO PROBLEM
DEVELOPING CONVECTION WITH NAM/GFS BOTH SHOWING LITTLE TO NO CINH
AFTER 18Z. MLCAPES AROUND OR JUST SHY OF 1000 J/KG IN BOTH
INSTANCES.

EXAMINATION OF CONVECTIVE MODE POINTS SQUARELY AT LOW TOPPED
SUPERCELLS AND TORNADO POTENTIAL. 0-6KM SHEAR IS 30-50KTS DEPENDING
ON MODEL...0-3KM CAPES ARE 100 J/KG OR MORE WITH LOW LCLS...20-30KTS
OF 1KM SHEAR AND 100-300 M2/S2 SRH. MUCH LIKE EXPECTED YESTERDAY THE
SW THIRD OR SO OF IA APPEARS TO BE HIGHLIGHTED AND WOULD NOT BE
SURPRISED AT ALL TO SEE FUTURE SPC DAY1 OUTLOOKS LIFT MOD RISK INTO
PORTIONS OF SRN IA. HAVE ADDED SEVERE WORDING TO FORECAST IN
THESE AREAS. INTERESTINGLY TWO OF THE TOP EIGHT CIPS ANALOG EVENTS
ARE ANDOVER KS /26 APR 91/ AND THE 1995 IA MEMORIAL DAY WEEKEND
TORNADO OUTBREAK /27 MAY 95/.

SECONDARY CONCERN WILL BE STRONG GRADIENT WINDS IN POTENT ELY FLOW
AHEAD OF STEADY OR SLIGHTLY DEEPENING LOW PRESSURE AREA. SEVERAL
SITES ARE CURRENTLY AT ADVISORY CRITERIA...AND WHILE THERE MAY BE
A MIDDAY LULL...EXPECT WINDS TO INCREASE ONCE AGAIN BY LATE
AFTERNOON. ADVISORY WILL BE IN EFFECT THROUGH 02Z ALONG AND NORTH
OF HIGHWAY 20.

YET ANOTHER CONCERN WILL BE HEAVY RAIN POTENTIAL. PWS WILL BE 1.25
INCHES OR BETTER WITH VERY STRONG 1000-850MB MOISTURE TRANSPORT
FEEDING MCS. PWS ARE PLUS 2-3SD AND LOW LCLS WILL INCREASE WARM
CLOUD DEPTHS AND EFFICIENCY. PRECIP AMOUNTS WILL NOT BE TOO
EXTREME THROUGH 00Z WITH CONVECTION FAIRLY TRANSIENT...BUT WOULD
NOT BE SURPRISED TO SEE LOCAL AMOUNTS EXCEED AN INCH.

HIGH TEMPS WILL VARY QUITE A BIT WITH 08Z SURFACE ANALYSIS SHOWING
WHAT APPEARS TO BE A DUAL WARM FRONTAL STRUCTURE...ONE FROM NE INTO
KS/MO AND ANOTHER THROUGH IA INTO IL. FORECAST SOUNDINGS SHOW
SOME MINIMAL MIXING RESULTING IN AROUND A 15-20F REBOUND NORTH TO
SOUTH...CLOSER TO THE WARMER END OF MOS GUIDANCE.

.LONG TERM /TONIGHT THROUGH SATURDAY/...
ISSUED AT 359 AM CDT SUN APR 27 2014

AFTERNOON AND EVENING STORMS...WITH SOME SEVERE WEATHER THREAT IN
THE EVENING AS DISCUSSED IN THE SHORT TERM DISCUSSION ABOVE...WILL
LIFT NORTHEAST ACROSS THE AREA THROUGH MIDNIGHT TONIGHT WITH
SLOWLY DIMINISHING INTENSITY. WE SHOULD THEN SEE A DECREASE IN
COVERAGE OF SHOWERS AND THUNDERSTORMS LATE TONIGHT AND MONDAY
MORNING. HOWEVER...THE SURFACE WARM FRONT WILL SHARPEN SOMEWHERE
ACROSS CENTRAL IOWA IN ADVANCE OF THE PARENT LOW PRESSURE SYSTEM
APPROACHING FROM THE WEST...AND ON MONDAY AFTERNOON DIURNAL
HEATING WILL ALLOW A ZONE OF LOW LEVEL INSTABILITY AND VORTICITY
TO DEVELOP ALONG/NEAR THE FRONT. THIS IS REFLECTED BY NUMEROUS
NUMERICAL MODELS AS WELL AS CLIMATOLOGY IN SUCH PATTERNS AND
REFLECTS A THREAT FOR SEVERE WEATHER WITH LANDSPOUT TYPE
TORNADOES POSSIBLE. A MORE PRECISE LOCATION OF THE WARM FRONT AND
SEVERE WEATHER THREAT DURING THIS TIME WILL BE DETERMINED AFTER
THE SUNDAY/SUNDAY NIGHT CONVECTION...BUT THIS SITUATION WILL NEED
TO BE MONITORED AS WE HEAD INTO MONDAY.

ON MONDAY NIGHT AS THE LARGE STACKED GYRE MOVES OVER CENTRAL IOWA
ANY SEVERE WEATHER THREAT WILL QUICKLY DIMINISH AND SEVERAL DAYS
OF COLD RAIN WILL BEGIN...PERSISTING AT LEAST THROUGH THURSDAY
WITH FREQUENT BUT GENERALLY LIGHT RAIN...OVERNIGHT LOWS IN THE
UPPER 30S TO MID 40S...AND DAYTIME HIGHS ONLY IN THE 40S AND 50S
TO USHER IN THE MONTH OF MAY. NEAR THE END OF THE WORK WEEK RAIN
CHANCES WILL DIMINISH...HOWEVER THE 500 MB FLOW WILL REMAIN
CYCLONIC WITH NO SIGNIFICANT WARMING FORECAST THROUGH NEXT
WEEKEND.

&&

.AVIATION...27/18Z
ISSUED AT 1234 PM CDT SUN APR 27 2014

PRIMARY CONCERN THIS AFTERNOON/EVENING WILL BE SEVERE STORMS
MOVING ACROSS THE AREA AS WELL AS STRONG EASTERLY WINDS. ATTEMPTED
TO TIME OUT PROGRESSION OF LINE MOVING EAST NORTHEAST WITH TIME
TODAY...AND WILL UPDATE AS NEEDED. LINE SHOULD BE MOVING EAST OF
REGION BY 23-00Z WITH SHOWERS EXPECTED TO CONTINUE. POTENTIAL
FOR HAIL...WIND AND POTENTIAL FOR TORNADOES SOUTH MAINLY BUT HAIL
THREAT MAY EXTEND NORTH SOMEWHAT WITH A FEW STORMS. EASTERLY WINDS
CONTINUE TO BE A PROBLEM FOR THE EVENING HOURS WITH STRONG LOW TO
WEST. MONDAY WILL SEE ANOTHER CHANCE FOR STORMS DURING THE
AFTERNOON ALONG THE BOUNDARY AND WILL NEED TO MONITOR FOR
POTENTIAL SEVERE IN THE AFTERNOON HOURS./REV

&&

.HYDROLOGY...
ISSUED AT 359 AM CDT SUN APR 27 2014

EVENT TOTAL QPF IS EXPECTED TO BE WIDESPREAD ONE TO THREE INCH
RAINS...MAINLY TODAY INTO MONDAY...WITH HIGHEST AMOUNTS OVER THE
NORTHEAST HALF OF THE FORECAST AREA. THIS AREA ALSO HAS THE
RELATIVELY WETTEST SOILS...REMOVED FROM THE D1-D2 DROUGHT FARTHER
SOUTH AND WEST. ENSEMBLE AND DETERMINISTIC QPF AND RESULTANT RIVER
MODEL OUTPUT SUGGESTS IOWA AND CEDAR RIVER BASINS WOULD BE FAVORED
TO SEE SIGNIFICANT WITHIN BANK RISES TO MINOR FLOODING. HIGHER END
ENSEMBLE SOLUTIONS WOULD ALSO SUGGEST MODERATE FLOODING IN A FEW
LOCATIONS.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL 9 PM CDT THIS EVENING FOR BLACK HAWK-BREMER-
BUTLER-CALHOUN-CERRO GORDO-EMMET-FRANKLIN-GRUNDY-HAMILTON-
HANCOCK-HARDIN-HUMBOLDT-KOSSUTH-PALO ALTO-POCAHONTAS-SAC-WEBSTER-
WINNEBAGO-WORTH-WRIGHT.

&&

SHORT TERM...SMALL
LONG TERM...LEE
AVIATION...REV
HYDROLOGY...SMALL

Hazardous weather outlook, Apr 27, 4:12 AM CDT, 10 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
412 AM CDT SUN APR 27 2014

IAZ044>050-057>062-070>075-081>086-092>097-280915-
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-
412 AM CDT SUN APR 27 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED THIS MORNING WITH
A LOW THREAT OF SEVERE WEATHER. THUNDERSTORMS WILL BECOME MORE
NUMEROUS WITH SIGNIFICANTLY HIGHER SEVERE WEATHER CHANCES THIS
AFTERNOON AND EVENING WHEN MULTIPLE TORNADOES...LARGE
HAIL...DAMAGING WIND AND LOCALLY HEAVY RAIN WILL ALL BE POSSIBLE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE WILL BE A CHANCE FOR THUNDERSTORMS MONDAY AND MONDAY
NIGHT...MAINLY TOWARD THE INTERSTATE 80 AND HIGHWAY 30 CORRIDORS.
SOME STORMS COULD BE SEVERE ON MONDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON AND EVENING...AND
AGAIN MONDAY AFTERNOON.

IAZ004>007-015>017-023>028-033>039-280915-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-
412 AM CDT SUN APR 27 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

A WIND ADVISORY IS IN EFFECT FOR THE AREA. PLEASE REFER TO THE
NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR
FURTHER DETAILS.

ISOLATED TO SCATTERED THUNDERSTORMS ARE FORECAST FOR MUCH OF
TODAY...BECOMING MORE WIDESPREAD FROM LATE THIS AFTERNOON THROUGH
TONIGHT. SEVERE WEATHER AND LOCALLY HEAVY RAIN WILL BE POSSIBLE
LATE THIS AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THUNDERSTORMS ARE FORECAST AGAIN ON MONDAY...WITH A FEW SEVERE
STORMS POSSIBLE TOWARD HIGHWAY 20 IN THE AFTERNOON. ISOLATED NON
SEVERE THUNDERSTORMS ARE THEN EXPECTED ON MONDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE LATE THIS AFTERNOON AND EVENING.

LEE

In the hours before

Special weather statement, Apr 27, 2:27 PM CDT, 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
227 PM CDT SUN APR 27 2014

IAZ074-075-084>086-095>097-272030-
APPANOOSE IA-MAHASKA IA-DAVIS IA-WAPELLO IA-LUCAS IA-WAYNE IA-
MARION IA-MONROE IA-
227 PM CDT SUN APR 27 2014

...STRONG THUNDERSTORMS TO CROSS INTO SOUTHERN IOWA...

AT 226 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM CORYDON TO 7 MILES NORTH OF
GREENCASTLE...AND MOVING NORTHEAST AT 50 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
OTTUMWA...OSKALOOSA...CENTERVILLE...ALBIA...BLOOMFIELD...CORYDON...
EDDYVILLE...RATHBUN LAKE...OTTUMWA INDUSTRIAL AIRPORT...LAKE
SUNDOWN...ELDON...FREMONT...SEYMOUR...MORAVIA...AGENCY...MOULTON...
LOVILIA...BEACON...UNIVERSITY PARK AND MYSTIC.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT SUNDAY EVENING FOR
NORTHEAST IOWA.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY
EVENING FOR .

LAT...LON 4074 9335 4143 9257 4129 9241 4117 9241
      4116 9226 4109 9218 4069 9218 4060 9233
      4058 9318
TIME...MOT...LOC 1926Z 227DEG 43KT 4076 9329 4038 9288

COGIL

Local storm report, Apr 27, 2:41 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
241 PM CDT SUN APR 27 2014

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

0232 PM     HEAVY RAIN       1 SE CLIVE              41.59N 93.75W
04/27/2014  U0.00 INCH       POLK               IA   AMATEUR RADIO

            STREET FLOODING...6 TO 9 IN OF PONDED WATER
            AT INTERSECTION OF WESTOWN PKWY AND VALLEY
            WEST DR.

&&

NWS DES MOINES IA
IRIS SYSTEM

Local storm report, Apr 27, 2:49 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
249 PM CDT SUN APR 27 2014

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

0235 PM     HEAVY RAIN       4 NW DES MOINES         41.62N 93.67W
04/27/2014  U0.00 INCH       POLK               IA   TRAINED SPOTTER

            HEAVY RAINFALL. NO HAIL.

&&

31

Local storm report, Apr 27, 2:52 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
252 PM CDT SUN APR 27 2014

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

0249 PM     HAIL             3 NNE ANKENY            41.76N 93.58W
04/27/2014  E0.25 INCH       POLK               IA   AMATEUR RADIO

            REPORTED AT OTTER CREEK GOLF COURSE.

&&

NWS DES MOINES IA
IRIS SYSTEM

Local storm report, Apr 27, 2:55 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
255 PM CDT SUN APR 27 2014

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

0238 PM     LIGHTNING        OSCEOLA                 41.03N 93.77W
04/27/2014                   CLARKE             IA   STORM CHASER

            CAR STRUCK BY LIGHTNING ON US 34 NEAR
            OSCEOLA. TRUNK OF CAR CAUGHT ON FIRE AS A
            RESULT. CONDITION OF OCCUPANTS UNKNOWN.
            RELAYED VIA SOCIAL MEDIA.

&&

NWS DES MOINES IA
IRIS SYSTEM

Local storm report, Apr 27, 2:56 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
256 PM CDT SUN APR 27 2014

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

0249 PM     HAIL             1 WNW CENTERVILLE       40.73N 92.89W
04/27/2014  E0.25 INCH       APPANOOSE          IA   EMERGENCY MANAGER

            REPORTED ON WEST EDGE OF CENTERVILLE.

&&

NWS DES MOINES IA
IRIS SYSTEM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 4:18 AM CDT	Wind Advisory	DMX	Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Emmet and 14 more	17 hr
Apr 27, 12:12 PM CDT	Special Weather Statement	DMX	Adams	18 min
Apr 27, 12:26 PM CDT	Special Weather Statement	DMX	Adams, Taylor	34 min
Apr 27, 12:30 PM CDT	Special Weather Statement	DMX	Adair	30 min
Apr 27, 1:00 PM CDT	Special Weather Statement	DMX	Adair, Dallas	45 min
Apr 27, 1:49 PM CDT	Special Weather Statement	DMX	Lucas	26 min
Apr 27, 2:07 PM CDT	Special Weather Statement	DMX	Webster	23 min
Apr 27, 2:24 PM CDT	Special Weather Statement	DMX	Hancock	36 min
Apr 27, 2:27 PM CDT	Special Weather Statement	DMX	Appanoose, Davis, Mahaska, Monroe, Wapello, Wayne	63 min
Apr 27, 3:18 PM CDT	Special Weather Statement	DMX	Jasper, Marshall, Poweshiek, Story	42 min
Apr 27, 3:36 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	39 min
Apr 27, 4:26 PM CDT	Special Weather Statement	DMX	Black Hawk, Bremer, Butler	49 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2014 Every severe thunderstorm warning in 2014

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.