Alert archive / Iowa / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 44, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 9, 2011, 10:35 PM CDT for Buena Vista County, Clay County, Iowa. It was in force for 30 min. 2 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 9, 2011, 10:35 PM CDT (03:35 UTC)
- Expired
- Apr 9, 2011, 11:05 PM CDT
- In force
- 30 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 58.0 mph
Counties Buena Vista County, IA, Clay County, IA
The radar
The Sioux Falls radar (KFSD), 153 km from the middle of the area, began a volume at 03:36 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 9, 10:54 PM CDT | HAIL 1.75 | Sioux Rapids, IA | PEA TO GOLF BALL SIZE HAIL |
| Apr 9, 11:04 PM CDT | HAIL 1.5 | Linn Grove, IA |
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 2 storm reports to this severe thunderstorm warning; the first came 19 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 9, 5:48 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.6 hours before the alert went out and 199 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.
- Mixed-layer CAPE
- 3327 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1533 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 270 m²/s²
- 0-3 km storm-relative helicity
- 403 m²/s²
- Significant tornado parameter
- 3.7
- Supercell composite
- 19.0
The text
As transmitted, in the capitals the NWS used until 2016.
333
WUUS53 KFSD 100335
SVRFSD
IAC021-041-100415-
/O.NEW.KFSD.SV.W.0044.110410T0335Z-110410T0415Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1035 PM CDT SAT APR 9 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN BUENA VISTA COUNTY IN NORTHWEST IOWA...
SOUTHEASTERN CLAY COUNTY IN NORTHWEST IOWA...
* UNTIL 1115 PM CDT
* AT 1036 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR
SIZE HAIL. THIS STORM WAS LOCATED 7 MILES SOUTHWEST OF LINN
GROVE...OR 13 MILES NORTHWEST OF STORM LAKE...AND MOVING NORTHEAST
AT 35 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
SIOUX RAPIDS AROUND 1050 PM CDT...
WEBB...MARATHON AND ALBERT CITY AROUND 1100 PM CDT...
OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
REMBRANDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT SUNDAY MORNING FOR
NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEASTERN SOUTH DAKOTA.
LAT...LON 4274 9533 4293 9537 4298 9492 4297 9491
4276 9491
TIME...MOT...LOC 0336Z 247DEG 32KT 4283 9527
WIND...HAIL <58MPH 1.25IN
$$
CJ2 follow-up statements
757
WWUS53 KFSD 100351
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1051 PM CDT SAT APR 9 2011
IAC021-041-100415-
/O.CON.KFSD.SV.W.0044.000000T0000Z-110410T0415Z/
CLAY IA-BUENA VISTA IA-
1051 PM CDT SAT APR 9 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
BUENA VISTA AND SOUTHEASTERN CLAY COUNTIES UNTIL 1115 PM CDT...
AT 1052 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE
HAIL. THIS STORM WAS LOCATED NEAR SIOUX RAPIDS...OR 16 MILES NORTH
OF STORM LAKE...MOVING NORTHEAST AT 35 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
MARATHON AND ALBERT CITY AROUND 1100 PM CDT...
WEBB AROUND 1105 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 4277 9522 4292 9527 4298 9492 4297 9491
4276 9491
TIME...MOT...LOC 0352Z 247DEG 32KT 4288 9512
WIND...HAIL <58MPH 1.25IN
$$
CJ820
WWUS53 KFSD 100405
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1105 PM CDT SAT APR 9 2011
IAC021-041-100415-
/O.CAN.KFSD.SV.W.0044.000000T0000Z-110410T0415Z/
CLAY IA-BUENA VISTA IA-
1105 PM CDT SAT APR 9 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BUENA VISTA AND
SOUTHEASTERN CLAY COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
LAT...LON 4277 9522 4292 9527 4298 9492 4297 9491
4276 9491
TIME...MOT...LOC 0405Z 247DEG 32KT 4292 9497
$$
CJWhat 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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 9, 3:40 PM CDT, 6 hours 55 minutes earlier.
Area forecast discussion, Apr 9, 3:40 PM CDT, 6 hours 55 minutes before
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 340 PM CDT SAT APR 9 2011 .DISCUSSION... SURFACE WARM FRONT HAS NOW APPROACHED SIOUX CITY...WITH THE AREA CLEAR OF LOW CLOUDS TO THE SOUTH OF THAT FRONT. FOR INSTANCE MANY TEMPERATURES IN EASTERN NE AND SW IA HAVE WARMED WELL INTO THE 80S. THERE IS COPIUS AMOUNTS OF LOW LEVEL THTE ADVECTION AND WARM AIR ADVECTION TONIGHT ACROSS MUCH OF THIS FA. SO THE MILLION DOLLAR QUESTION IS WHEN...AND WHERE WILL THE CAP BREAK TO ALLOW FOR THUNDERSTORM DEVELOPMENT. CURRENTLY...THOUGHTS ARE THAT CONVECTIVE INITIATION MAY FIRST FORM DOWNSTREAM TO THE SOUTH OR SOUTHEAST OF THIS AREA WHERE THE TEMPERATURES HAVE REALLY WARMED. THE CONVECTION SHOULD THEN PROCEED NORTHEASTWARD WHERE THE 0-6KM MEAN WIND IS 210 DEGREES AT 35 TO 40 KNOTS. THIS PLACES NW IA AND IMMEDIATE ADJACENT AREAS AT A RISK FOR SEVERE WEATHER THIS EVENING. A SEVERE WEATHER CHECKLIST DONE EARLIER TODAY FOR STORM LAKE IA REVEALED WIND SHEAR OFF THE CHARTS VALID FOR 00Z/10. FOR INSTANCE 0-3KM HELICITY IS 555 M/S AND 0-3KM BULK SHEAR AT 47 KNOTS. ML CAPE IS NEAR 3200 J/KG WITH THE CIN BEGINNING TO BREAK BY 00Z. SO ROTATING SUPERCELLS ARE CERTAINLY POSSIBLE THIS EVENING WITH A THREAT FOR LARGE HAIL AND ISOLATED TORNADOES ALONG THE WARM FRONT. HOWEVER ONE ITEM TO NOTE IS THAT WITH THE FORWARD PROPOGATION OF THE STORMS...THE SEVERE WEATHER THREAT WILL LIKELY NOT LAST THAT LONG. IN FACT AFTER ABOUT 03-04Z... THINGS TO BEGIN TO STABILIZE RATHER RAPIDLY AS SOME DRY SLOTTING BEGINS TO TAKE OVER OFF THE SURFACE. TO THE WEST...MOIST UPSLOPE FLOW WILL DOMINATE OUR AREAS WEST OF I 29 AND IT APPEARS LIKELY THAT SOME FOG AND DRIZZLE WILL LINGER THIS EVENING IN THOSE AREAS. STILL... ELEVATED STABILITY IS ABUNDANT IN OUR WESTERN ZONES SO DESPITE COOL SURFACE TEMPERATURES...GENERAL THUNDERSTORMS ARE A THREAT FOR OUR WEST ALSO THIS EVENING. AS ELUDED TOO EARLIER...AFTER MIDNIGHT THE DRY SLOTTING BEHIND THE WARM FRONT CONTINUES TO MOVE NORTHWARD EAST OF I 29...WITH STRATUS LINGERING WEST OF I 29. MEASURABLE RAINFALL WILL TAPER OFF. LOWS TONIGHT WILL BE MILD AS COLD AIR IS LACKING EVEN AS FAR WEST AS SW ND. HAVE MID 40S GOING IN OUR WEST...TO AROUND 60 IN STORM LAKE. /MJF AFTER THE BRIEF BREAK IN THE PRECIPITATION IN THE VERY EARLY MORNING HOURS OF SUNDAY...WILL SEE SHOWERS AND ISOLATED THUNDERSTORMS REDEVELOP OVER OUR SOUTH CENTRAL SOUTH DAKOTA ZONES BY MID MORNING AS THE MAIN UPPER LEVEL LOW TRACKS OUT OF COLORADO. PRECIPITATION WILL MOVE SLOWLY EASTWARD ACROSS THE CWA DURING THE DAY ON SUNDAY...CONTINUING TO EXPAND TO THE EAST ON SUNDAY NIGHT AS THE UPPER LEVEL LOW TRACKS INTO EASTERN MINNESOTA BY EARLY ON MONDAY. THE ATMOSPHERE BECOME INCREASINGLY STABLE ON SUNDAY...SO THINK THE MAIN THUNDERSTORM CHANCES WILL BE THROUGH THE BROOKINGS TO MARSHALL AREA IN THE MORNING IN THE VICINITY OF A WANING MIDLEVEL INSTABILITY/THETA E AXIS OVER THAT AREA. HAVE HIGHEST POPS ON SUNDAY ACROSS OUR WEST AND NORTH IN AREA OF BEST UPPER LEVEL SYNOPTIC LIFT...PER 700 TO 500 MB DIV Q FIELD. WITH AN EVER TIGHTENING SURFACE GRADIENT AS THE SURFACE LOW LIFTS TO THE NORTHEAST...WILL SEE NORTHWESTERLY WINDS PICK UP ACROSS THE AREA THROUGH THE AFTERNOON...AND MAY BE BRUSHING WIND ADVISORY CRITERIA IN SOME OF OUR WESTERN LOCALES. WITH OUR CWA BISECTED BY A COOL AIRMASS TO THE WEST AND A WARMER AIRMASS TO THE EAST...WILL SEE A WIDE RANGE OF TEMPERATURES ACROSS THE AREA ON SUNDAY. HIGHS WILL BE AROUND 50 THROUGH THE CHAMBERLAIN TO HURON CORRIDOR TO THE MID 70S OVER THE SPENCER/STORM LAKE AREA. PRECIPITATION WILL CONTINUE TO PULL TO THE NORTH AND EAST ON SUNDAY NIGHT AS FORCING TRACKS OFF INTO THE UPPER MIDWEST. COOLER AIR WILL SLOWLY FILTER INTO THE AREA ON SUNDAY NIGHT WITH WINDY CONDITIONS PERSISTING UNDER A TIGHT GRADIENT/RAPID PRESSURE RISES/AND STRONG COLD AIR ADVECTION. LOWS WILL BE IN THE MID 30S TO LOWER 40S. MONDAY WILL BE A BETTER DAY WITH DECREASING CLOUDS AND TEMPERATURES A COUPLE OF DEGREES ABOVE NORMAL AS SURFACE HIGH PRESSURE/UPPER LEVEL RIDGING BUILD INTO THE REGION. THE DOWN SIDE TO THE DAY WILL BE THE PERSISTENT STRONG WINDS. HIGHS ON MONDAY WILL BE IN THE RANGE OF MID 50S TO LOWER 60S. SOUTHERLY FLOW RETURNS TO THE AREA ON TUESDAY ON THE BACKSIDE OF THE HIGH...WITH LESS WIND AND WARMER TEMPERATURES. HIGHS LOOKING TO BE IN THE MID 60S TO AROUND 70. A BOUNDARY/LOW LEVEL CONVERGENCE ZONE SETS UP ACROSS THE AREA ON TUESDAY NIGHT AND WEDNESDAY...INTERACTING WITH A SHORTWAVE TRACKING OUT OF THE CENTRAL ROCKIES...AND KEEPING A CHANCE OF SHOWERS OVER OUR AREA INTO WEDNESDAY NIGHT WITH THE BOUNDARY NOT MAKING MUCH MOVEMENT THROUGH THE PERIOD. TEMPERATURES WILL BE COOLER ON WEDNESDAY IN OUR WEST...BEHIND THE BOUNDARY...WITH HIGHS IN THE 50S...WHILE ON THE WARM SIDE OF THE FEATURE TEMPERATURES WILL RISE INTO THE UPPER 60S OVER PORTIONS OF NORTHWEST IOWA. MAIN UPPER LEVEL TROUGH SWINGS THROUGH THE REGION ON THURSDAY...WITH THE BOUNDARY FINALLY PULLING TO THE SOUTH AND EAST...AND HIGHS IN THE LOWER TO MID 50S ACROSS THE COUNTY WARNING AREA. MODEL DIFFERENCES WITH HOW FAST PRECIPITATION PULLS OUT FOR THE END OF NEXT WEEK. TEMPERATURES LOOK TO UNDERGO SLOW WARMING FOR FRIDAY AND SATURDAY. /JM && .AVIATION... STRATUS NORTH OF THE WARM FRONT WILL CONTINUE TO BE ABUNDANT ACROSS THE NORTHERN AND WESTERN ZONES OF THE FSD FORECAST AREA THIS EVENING. THEREFORE CONDITIONS WILL BE GENERALLY IFR IN MOST OF SW MN AND AREAS WEST OF I 29 THIS EVENING. IN ADDITION...STRONG CAPPING IS IN PLACE RIGHT NOW. BUT THE CAPPING IS EXPECTED TO BREAK AS A SHORT WAVE OF ENERGY LIFTS NORTHEASWARD THIS EVENING. THUNDERSTORMS SHOULD DEVELOP ACROSS THIS AREA AND MAY BECOME QUITE NUMEROUS ALONG AND EAST OF I 29. THERE IS ALSO A SEVERE POTENTIAL FOR THOSE AREAS. AFTER MIDNIGHT...THE NAM AND GFS LOW LEVEL RELATIVE HUMIDITY FIELDS SHOW A LOT OF UPPER IFR TO MVFR STRATUS NUDGING EASTWARD ACROSS THE FORECAST AREA...ADVANCING TO ALONG AND WEST OF A YANKTON SD...TO SIOUX FALLS...TO MARSHALL MN LINE BY 12Z SUNDAY. THIS IS IN RESPONSE TO LOW LEVEL WINDS BECOME WESTERLY...AND ONE CAN SEE THE AMOUNT OF STRATUS CURRENTLY PRESENT IN CENTRAL SD. EAST OF THAT LINE...A FEW SHOWERS OR THUNDERSTORMS MAY LINGER FROM 06Z TO 12Z SUNDAY...BUT OTHERWISE CONDITIONS SHOULD BE MVFR TO VFR. /MJF && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE.
Hazardous weather outlook, Apr 9, 4:00 PM CDT, 6 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 400 PM CDT SAT APR 09 2011 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-101200- AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA- CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE- DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON- IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN- LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN- OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN- SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON- 400 PM CDT SAT APR 09 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... LATE THIS AFTERNOON...ISOLATED THUNDERSTORMS MAY DEVELOP ACROSS EASTERN NEBRASKA...AND PUSH INTO SOUTHEAST SOUTH DAKOTA AND NORTHWEST IOWA BY EARLY EVENING. STORMS WILL DEVELOP VERY RAPIDLY WITH A RAPID NORTHEAST MOVEMENT. THIS IS A CONDITIONAL THREAT. IF STORMS DO DEVELOP AND CAN BECOME ROOTED IN THE MORE MOIST AND UNSTABLE AIR MASS NEAR AND TO THE EAST OF THE INTERSTATE 29 CORRIDOR...THEY WILL QUICKLY BECOME SEVERE WITH A THREAT FOR HAIL TO AROUND 2 INCHES IN DIAMETER. IN ADDITION WITH STRONG WINDS ABOVE THE SURFACE...WINDS UP TO 65 MPH MAY OCCUR IN SOME OF THE STRONGEST CELLS. THERE IS EVEN A THREAT FOR TORNADOES IN A SHORT WINDOW FROM 6 PM TO 9 PM ACROSS NORTHWEST IOWA AND IMMEDIATELY ADJACENT AREAS. AS STORMS MOVE NORTHWARD OF INTERSTATE 90...THE THREAT WILL CHANGE TO PRIMARILY VERY LARGE HAIL UP TO AROUND 2 INCHES IN DIAMETER...ESPECIALLY ACROSS EXTREME EASTERN SOUTH DAKOTA INTO SOUTHWEST MINNESOTA. THE RISK FOR SEVERE STORMS SHOULD DIMINISH BY MIDNIGHT. OTHER MORE SCATTERED STORMS MAY OCCUR FURTHER WEST OF INTERSTATE 29...BUT ARE NOT EXPECTED TO BECOME SEVERE...WITH SMALL HAIL THE MAIN THREAT. FLOODING... FLOODING WILL CONTINUE OVER MUCH OF THE BIG SIOUX AND JAMES RIVERS FOR THE FORESEEABLE FUTURE. BY THE MIDDLE OF THE WEEK...THE DES MOINES RIVER IS EXPECTED TO DROP BELOW FLOOD STAGE AT WINDOM AND JACKSON. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NORTHWEST WINDS BEHIND AN EXITING AREA OF LOW PRESSURE ON SUNDAY NIGHT AND MONDAY WILL REACH 25 TO 35 MPH...WITH SOME GUSTS OVER 40 MPH POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 5 PM MAINLY ALONG AND EAST OF INTERSTE 29. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
In the hours before
Local storm report, Apr 9, 9:47 PM CDT, 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
947 PM CDT SAT APR 09 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0927 PM HAIL RUSSELL 44.32N 95.95W
04/09/2011 E1.50 INCH LYON MN TRAINED SPOTTER
&&
JSHEEHANLocal storm report, Apr 9, 9:57 PM CDT, 38 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
957 PM CDT SAT APR 09 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0946 PM TORNADO 7 W STORM LAKE 42.64N 95.34W
04/09/2011 BUENA VISTA IA STORM CHASER
TWO TORNADOES REPORTED BY CHASERS 7W OF STORM LAKE
RELAYED BY MEDIA
&&
DMORINLocal storm report, Apr 9, 10:08 PM CDT, 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1008 PM CDT SAT APR 09 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1007 PM HAIL MERRILL 42.72N 96.25W
04/09/2011 E0.88 INCH PLYMOUTH IA FIRE DEPT/RESCUE
DIME TO NICKLE
&&
DMORINSpecial weather statement, Apr 9, 10:31 PM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1031 PM CDT SAT APR 9 2011 IAZ002-003-013-014-100615- OSCEOLA-DICKINSON-OBRIEN-CLAY- INCLUDING THE CITIES OF...SIBLEY...SPIRIT LAKE...MILFORD... ARNOLDS PARK...SHELDON...HARTLEY...SANBORN...SPENCER 1031 PM CDT SAT APR 9 2011 ...SPECIAL WEATHER STATEMENT... VERY STRONG NON-THUNDERSTORM WINDS CAN BE EXPECTED UNTIL AFTER MIDNIGHT ACROSS THE AREA. EXPECT SUDDEN WIND GUSTS UP TO 70 MPH. TAKE SHELTER INDOORS IN A STRONG BUILDING AND STAY AWAY FROM WINDOWS. THESE STRONG WINDS MOVED THROUGH THE SPIRIT LAKE AREA AROUND 1000 PM. THESE CONDITIONS MAY REOCCUR UNTIL 100 AM SUNDAY MORNING. DEM
Local storm report, Apr 9, 10:32 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1032 PM CDT SAT APR 09 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1013 PM HAIL LE MARS 42.79N 96.17W
04/09/2011 E2.00 INCH PLYMOUTH IA BROADCAST MEDIA
&&
JSHEEHANLocal storm report, Apr 9, 10:34 PM CDT, 1 minute before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1034 PM CDT SAT APR 09 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0640 PM HAIL SLOAN 42.23N 96.22W
04/09/2011 E0.75 INCH WOODBURY IA LAW ENFORCEMENT
0640 PM HAIL SALIX 42.31N 96.29W
04/09/2011 E1.00 INCH WOODBURY IA LAW ENFORCEMENT
AT THE JUNCTION OF 290TH AVE AND K45
0646 PM HAIL SALIX 42.31N 96.29W
04/09/2011 E1.00 INCH WOODBURY IA TRAINED SPOTTER
0649 PM HAIL SALIX 42.31N 96.29W
04/09/2011 E1.00 INCH WOODBURY IA LAW ENFORCEMENT
MARBLE TO QUARTER SIZE HAIL
0650 PM HAIL 1 NW DANTE 43.05N 98.20W
04/09/2011 E1.00 INCH CHARLES MIX SD TRAINED SPOTTER
0700 PM HAIL SMITHLAND 42.23N 95.93W
04/09/2011 E1.25 INCH WOODBURY IA TRAINED SPOTTER
0729 PM HAIL 2 W BATTLE CREEK 42.32N 95.64W
04/09/2011 M1.00 INCH IDA IA EMERGENCY MNGR
PEA TO QUARTER SIZE
0733 PM HAIL 3 W BATTLE CREEK 42.32N 95.66W
04/09/2011 M1.50 INCH IDA IA EMERGENCY MNGR
0750 PM HAIL WAKONDA 43.01N 97.11W
04/09/2011 E1.00 INCH CLAY SD EMERGENCY MNGR
0757 PM HAIL IDA GROVE 42.34N 95.47W
04/09/2011 E1.50 INCH IDA IA LAW ENFORCEMENT
0844 PM HAIL 3 S SALEM 43.68N 97.39W
04/09/2011 E1.00 INCH MCCOOK SD EMERGENCY MNGR
0845 PM HAIL 2 S GALVA 42.48N 95.42W
04/09/2011 E1.00 INCH IDA IA TRAINED SPOTTER
0846 PM HAIL 3 S SALEM 43.68N 97.39W
04/09/2011 E1.50 INCH MCCOOK SD EMERGENCY MNGR
0903 PM HAIL PIPESTONE 44.00N 96.31W
04/09/2011 E1.00 INCH PIPESTONE MN PUBLIC
0903 PM HAIL PIPESTONE 44.00N 96.31W
04/09/2011 E1.00 INCH PIPESTONE MN TRAINED SPOTTER
0924 PM HAIL RUSSELL 44.32N 95.95W
04/09/2011 E0.88 INCH LYON MN TRAINED SPOTTER
0927 PM HAIL RUSSELL 44.32N 95.95W
04/09/2011 E1.50 INCH LYON MN TRAINED SPOTTER
0946 PM TORNADO 7 W STORM LAKE 42.64N 95.34W
04/09/2011 BUENA VISTA IA STORM CHASER
TWO TORNADOES REPORTED BY CHASERS 7W OF STORM LAKE
RELAYED BY MEDIA
1007 PM HAIL MERRILL 42.72N 96.25W
04/09/2011 E0.88 INCH PLYMOUTH IA FIRE DEPT/RESCUE
DIME TO NICKLE
1013 PM HAIL LE MARS 42.79N 96.17W
04/09/2011 E2.00 INCH PLYMOUTH IA BROADCAST MEDIA
&&
DMORINThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 7:09 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 36 min |
| Apr 9, 7:31 PM CDT | Tornado Warning | FSD | Ida | 29 min |
| Apr 9, 7:44 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 31 min |
| Apr 9, 7:46 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Woodbury | 29 min |
| Apr 9, 7:56 PM CDT | Tornado Warning | FSD | Ida | 34 min |
| Apr 9, 8:08 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida, Woodbury | 37 min |
| Apr 9, 8:11 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 34 min |
| Apr 9, 8:19 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 41 min |
| Apr 9, 8:40 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 35 min |
| Apr 9, 8:41 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 19 min |
| Apr 9, 8:49 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 41 min |
| Apr 9, 8:55 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 35 min |
| Apr 9, 9:08 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 37 min |
| Apr 9, 9:09 PM CDT | Tornado Warning | FSD | Buena Vista | 36 min |
| Apr 9, 9:15 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 30 min |
| Apr 9, 9:17 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 43 min |
| Apr 9, 9:24 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth, Woodbury | 36 min |
| Apr 9, 9:25 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 20 min |
| Apr 9, 9:31 PM CDT | Tornado Warning | FSD | Plymouth, Woodbury | 29 min |
| Apr 9, 9:36 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay | 39 min |
| Apr 9, 9:46 PM CDT | Tornado Warning | FSD | Buena Vista | 29 min |
| Apr 9, 9:48 PM CDT | Tornado Warning | FSD | Cherokee | 27 min |
| Apr 9, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 32 min |
| Apr 9, 10:02 PM CDT | Tornado Warning | FSD | Buena Vista | 28 min |
| Apr 9, 10:09 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 36 min |
| Apr 9, 10:13 PM CDT | Tornado Warning | FSD | Buena Vista, Cherokee | 47 min |
| Apr 9, 10:24 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 36 min |
| Apr 9, 10:31 PM CDT | Tornado Warning | FSD | Cherokee | 29 min |
| Apr 9, 10:50 PM CDT | Tornado Warning | FSD | Buena Vista, Cherokee | 40 min |
| Apr 9, 11:11 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 34 min |
| Apr 9, 11:27 PM CDT | Tornado Warning | FSD | Buena Vista, Clay | 18 min |
| Apr 9, 11:39 PM CDT | Tornado Warning | FSD | Clay | 21 min |
| Apr 10, 12:24 AM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 36 min |
| Apr 10, 12:47 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida | 28 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2011Every severe thunderstorm warning in 2011
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.