Alert archive / South Dakota / Flash Flood Watches in 2011
Flash Flood Watch 3, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood watch at Jun 19, 2011, 3:40 AM CDT for 4 states. It took effect at Jun 19, 2011, 7:00 PM CDT. It was in force for 40 hr.
The area
The counties it named.
The facts
- Issued
- Jun 19, 2011, 3:40 AM CDT (08:40 UTC)
- In effect from
- Jun 19, 2011, 7:00 PM CDT
- Expired
- Jun 21, 2011, 10:53 AM CDT
- In force
- 40 hr
- Issued by
- NWS Sioux Falls, SD
- Flood severity
- None
All 38 counties
Lyon County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Dakota County, NE, Dixon County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 29 km from the middle of the area, began a volume at 08:41 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
Aberdeen, SD (KABR), launched 00:00Z, 8.7 hours before the alert went out and 180 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2277 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
940 WGUS63 KFSD 190840 FFAFSD URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 340 AM CDT SUN JUN 19 2011 .THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS EVENING AROUND A STRENGTHENING LOW PRESSURE SYSTEM IN NORTH CENTRAL NEBRASKA AND SOUTH CENTRAL SOUTH DAKOTA. AS THE LOW CENTER DEEPENS AND LIFTS NORTHWARD...SHOWERS AND THUNDERSTORMS WILL INTENSIFY AND MOVE SLOWLY THROUGH THE MISSOURI RIVER BASIN. THE COMBINATION OF SLOW STORM MOTION AND HIGH RAINFALL RATES WILL LIKELY RESULT IN FLASH FLOODING ACROSS THE WATCH AREA. THESE THUNDERSTORMS ARE EXPECTED TO LESSEN IN INTENSITY AND BEGIN MOVING OUT OF THE AREA BY TUESDAY MORNING. SDZ050-057-063-191645- /O.NEW.KFSD.FF.A.0003.110620T0000Z-110621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GREGORY-BRULE-CHARLES MIX- INCLUDING THE CITIES OF...GREGORY...BURKE...CHAMBERLAIN... KIMBALL...WAGNER...PLATTE...LAKE ANDES...MARTY 340 AM CDT SUN JUN 19 2011 ...FLASH FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH TUESDAY MORNING... THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * FLASH FLOOD WATCH FOR A PORTION OF SOUTH CENTRAL SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...BRULE...CHARLES MIX AND GREGORY. * FROM THIS EVENING THROUGH TUESDAY MORNING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 3 INCHES FROM THIS EVENING THROUGH TUESDAY MORNING. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
7 follow-up statements
539 WGUS63 KFSD 191629 FFAFSD FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 1129 AM CDT SUN JUN 19 2011 .THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS EVENING AROUND A STRENGTHENING LOW PRESSURE SYSTEM IN NORTH CENTRAL NEBRASKA AND SOUTH CENTRAL SOUTH DAKOTA. AS THE LOW CENTER DEEPENS AND LIFTS NORTHWARD...SHOWERS AND THUNDERSTORMS WILL INTENSIFY AND MOVE SLOWLY THROUGH THE MISSOURI RIVER BASIN. THE COMBINATION OF SLOW STORM MOTION AND HIGH RAINFALL RATES WILL LIKELY RESULT IN FLASH FLOODING ACROSS THE WATCH AREA. THESE THUNDERSTORMS ARE EXPECTED TO LESSEN IN INTENSITY AND BEGIN MOVING OUT OF THE AREA BY TUESDAY MORNING. SDZ050-057-063-200030- /O.CON.KFSD.FF.A.0003.110620T0000Z-110621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GREGORY-BRULE-CHARLES MIX- INCLUDING THE CITIES OF...GREGORY...BURKE...CHAMBERLAIN... KIMBALL...WAGNER...PLATTE...LAKE ANDES...MARTY 1129 AM CDT SUN JUN 19 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 7 PM CDT THIS EVENING THROUGH TUESDAY MORNING... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF SOUTH CENTRAL SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...BRULE...CHARLES MIX AND GREGORY. * FROM 7 PM CDT THIS EVENING THROUGH TUESDAY MORNING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 3 INCHES FROM THIS EVENING THROUGH TUESDAY MORNING. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
776 WGUS63 KFSD 200217 FFAFSD FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 917 PM CDT SUN JUN 19 2011 .A LARGE UPPER LOW WILL MOVE VERY SLOWLY EASTWARD ACROSS THE REGION THROUGH TUESDAY. SHOWERS AND THUNDERSTORMS WILL BE FOUND WITH THIS SYSTEM...WITH THE HEAVIEST RAINFALL ANTICIPATED ACROSS CENTRAL SOUTH DAKOTA AT THIS TIME...THROUGH THE MISSOURI RIVER BASIN. THE COMBINATION OF SLOW STORM MOTION AND HIGH RAINFALL RATES WILL LIKELY RESULT IN FLASH FLOODING ACROSS THE WATCH AREA. THE HEAVIEST RAINFALL SHOULD BEGIN MOVING EASTWARD TOWARD THE I 29 CORRIDOR ON TUESDAY. SDZ050-057-063-201030- /O.CON.KFSD.FF.A.0003.000000T0000Z-110621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GREGORY-BRULE-CHARLES MIX- INCLUDING THE CITIES OF...GREGORY...BURKE...CHAMBERLAIN... KIMBALL...WAGNER...PLATTE...LAKE ANDES...MARTY 917 PM CDT SUN JUN 19 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF SOUTH CENTRAL SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...BRULE...CHARLES MIX AND GREGORY. * THROUGH TUESDAY MORNING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 3 INCHES LATE TONIGHT THROUGH TUESDAY MORNING. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
472 WGUS63 KFSD 200848 FFAFSD URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 348 AM CDT MON JUN 20 2011 .A LARGE LOW PRESSURE SYSTEM WILL MOVE VERY SLOWLY EASTWARD ACROSS THE REGION THROUGH MID WEEK. ROUNDS OF SHOWERS AND THUNDERSTORMS CAN BE EXPECTED WITH THIS SYSTEM...WITH THE HEAVIEST RAINFALL EXPECTED FROM SOUTH CENTRAL SOUTH DAKOTA EXTENDING NORTH AND EAST THROUGH EASTERN SOUTH DAKOTA INTO WESTERN MINNESOTA. HEAVY RAINFALL IS EXPECTED TO AFFECT PORTIONS OF THE MISSOURI RIVER BASIN TONIGHT. THE COMBINATION OF SLOW STORM MOTION AND HIGH RAINFALL RATES WILL LIKELY RESULT IN FLASH FLOODING ACROSS THE WATCH AREA. THE HEAVY RAINFALL WILL BEGIN TO SHIFT EAST ON TUESDAY...FOCUSING MAINLY ON THE EASTERN DAKOTAS. SDZ038>040-052>056-058>062-064>066-068-069-201700- /O.EXB.KFSD.FF.A.0003.000000T0000Z-110622T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BEADLE-KINGSBURY-BROOKINGS-JERAULD-SANBORN-MINER-LAKE-MOODY- AURORA-DAVISON-HANSON-MCCOOK-MINNEHAHA-DOUGLAS-HUTCHINSON-TURNER- BON HOMME-YANKTON- INCLUDING THE CITIES OF...HURON...DE SMET...ARLINGTON... LAKE PRESTON...BROOKINGS...WESSINGTON SPRINGS...ALPENA... WOONSOCKET...HOWARD...MADISON...FLANDREAU...PLANKINTON... WHITE LAKE...STICKNEY...MITCHELL...ALEXANDRIA...EMERY...SALEM... CANISTOTA...BRIDGEWATER...MONTROSE...SIOUX FALLS...ARMOUR... CORSICA...DELMONT...PARKSTON...FREEMAN...MENNO...TRIPP...PARKER... CENTERVILLE...MARION...VIBORG...HURLEY...CHANCELLOR...TYNDALL... SCOTLAND...SPRINGFIELD...AVON...TABOR...YANKTON 348 AM CDT MON JUN 20 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH TUESDAY EVENING... THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE PORTIONS OF EAST CENTRAL SOUTH DAKOTA AND SOUTHEAST SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL SOUTH DAKOTA...BEADLE...BROOKINGS... JERAULD...KINGSBURY...LAKE...MINER...MOODY AND SANBORN. IN SOUTHEAST SOUTH DAKOTA...AURORA...BON HOMME...DAVISON... DOUGLAS...HANSON...HUTCHINSON...MCCOOK...MINNEHAHA...TURNER AND YANKTON. * THROUGH TUESDAY EVENING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 3 INCHES THROUGH THE DAY TUESDAY. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ SDZ050-057-063-201700- /O.EXT.KFSD.FF.A.0003.000000T0000Z-110622T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GREGORY-BRULE-CHARLES MIX- INCLUDING THE CITIES OF...GREGORY...BURKE...CHAMBERLAIN... KIMBALL...WAGNER...PLATTE...LAKE ANDES...MARTY 348 AM CDT MON JUN 20 2011 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH TUESDAY EVENING... THE FLASH FLOOD WATCH IS NOW IN EFFECT FOR * A PORTION OF SOUTH CENTRAL SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...BRULE...CHARLES MIX AND GREGORY. * THROUGH TUESDAY EVENING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 3 INCHES THROUGH THE DAY TUESDAY. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ BT
042 WGUS63 KFSD 201645 FFAFSD FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 1145 AM CDT MON JUN 20 2011 .STRONG LOW PRESSURE WILL MOVE VERY SLOWLY EASTWARD ACROSS THE REGION THROUGH MID WEEK. ROUNDS OF SHOWERS AND THUNDERSTORMS CAN BE EXPECTED WITH THIS SYSTEM...WITH THE HEAVIEST RAINFALL EXPECTED FROM SOUTH CENTRAL SOUTH DAKOTA EXTENDING NORTH AND EAST THROUGH EASTERN SOUTH DAKOTA INTO WESTERN MINNESOTA. HEAVY RAINFALL IS EXPECTED TO AFFECT PORTIONS OF THE MISSOURI RIVER BASIN TONIGHT. THE COMBINATION OF SLOW STORM MOTION AND HIGH RAINFALL RATES WILL LIKELY RESULT IN FLASH FLOODING ACROSS THE WATCH AREA. THE HEAVY RAINFALL WILL BEGIN TO SHIFT EAST ON TUESDAY...FOCUSING MAINLY ON THE EASTERN DAKOTAS. SDZ038>040-050-052>066-068-069-210045- /O.CON.KFSD.FF.A.0003.000000T0000Z-110622T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BEADLE-KINGSBURY-BROOKINGS-GREGORY-JERAULD-SANBORN-MINER-LAKE- MOODY-BRULE-AURORA-DAVISON-HANSON-MCCOOK-MINNEHAHA-CHARLES MIX- DOUGLAS-HUTCHINSON-TURNER-BON HOMME-YANKTON- INCLUDING THE CITIES OF...HURON...DE SMET...ARLINGTON... LAKE PRESTON...BROOKINGS...GREGORY...BURKE...WESSINGTON SPRINGS... ALPENA...WOONSOCKET...HOWARD...MADISON...FLANDREAU... CHAMBERLAIN...KIMBALL...PLANKINTON...WHITE LAKE...STICKNEY... MITCHELL...ALEXANDRIA...EMERY...SALEM...CANISTOTA...BRIDGEWATER... MONTROSE...SIOUX FALLS...WAGNER...PLATTE...LAKE ANDES...MARTY... ARMOUR...CORSICA...DELMONT...PARKSTON...FREEMAN...MENNO...TRIPP... PARKER...CENTERVILLE...MARION...VIBORG...HURLEY...CHANCELLOR... TYNDALL...SCOTLAND...SPRINGFIELD...AVON...TABOR...YANKTON 1145 AM CDT MON JUN 20 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF EAST CENTRAL SOUTH DAKOTA...SOUTH CENTRAL SOUTH DAKOTA AND SOUTHEAST SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL SOUTH DAKOTA...BEADLE...BROOKINGS... JERAULD...KINGSBURY...LAKE...MINER...MOODY AND SANBORN. IN SOUTH CENTRAL SOUTH DAKOTA...BRULE...CHARLES MIX AND GREGORY. IN SOUTHEAST SOUTH DAKOTA...AURORA...BON HOMME...DAVISON... DOUGLAS...HANSON...HUTCHINSON...MCCOOK...MINNEHAHA...TURNER AND YANKTON. * THROUGH TUESDAY EVENING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 4 INCHES THROUGH THE DAY TUESDAY. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI RIVER AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
766 WGUS63 KFSD 201948 FFAFSD URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 248 PM CDT MON JUN 20 2011 .STRONG LOW PRESSURE WILL MOVE VERY SLOWLY EASTWARD ACROSS THE REGION THROUGH MID WEEK. ROUNDS OF SHOWERS AND THUNDERSTORMS CAN BE EXPECTED WITH THIS SYSTEM...WITH THE HEAVIEST RAINFALL EXPECTED FROM SOUTHEAST SOUTH DAKOTA INTO SOUTHWEST MINNESOTA AND NORTHWEST IOWA. HEAVY RAINFALL IS EXPECTED TO AFFECT PORTIONS OF THE MISSOURI RIVER BASIN TONIGHT. THE COMBINATION OF SLOW STORM MOTION AND HIGH RAINFALL RATES WILL LIKELY RESULT IN FLASH FLOODING ACROSS THE WATCH AREA. THE HEAVY RAINFALL WILL BEGIN TO SHIFT EAST ON TUESDAY...FOCUSING MAINLY ON THE EASTERN DAKOTAS...MINNESOTA AND NORTHERN IOWA. IAZ001-002-012-020-MNZ071-072-080-081-089-090-097-098-NEZ013-014- SDZ067-070-071-210400- /O.EXA.KFSD.FF.A.0003.000000T0000Z-110622T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LYON-OSCEOLA-SIOUX-PLYMOUTH-LINCOLN-MURRAY-COTTONWOOD-NOBLES- JACKSON-PIPESTONE-ROCK-DIXON-DAKOTA-CLAY-UNION- INCLUDING THE CITIES OF...ROCK RAPIDS...GEORGE...INWOOD... LARCHWOOD...SIBLEY...ORANGE CITY...SIOUX CENTER...LE MARS... TYLER...HENDRICKS...LAKE BENTON...IVANHOE...MARSHALL...SLAYTON... FULDA...WINDOM...MOUNTAIN LAKE...WORTHINGTON...JACKSON... LAKEFIELD...PIPESTONE...LUVERNE...WAKEFIELD...PONCA...ALLEN... SOUTH SIOUX CITY...CANTON...LENNOX...TEA...HARRISBURG... VERMILLION...NORTH SIOUX CITY...BERESFORD...ELK POINT... ALCESTER...JEFFERSON 248 PM CDT MON JUN 20 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH TUESDAY EVENING... THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE PORTIONS OF NORTHWEST IOWA... SOUTHWEST MINNESOTA...NORTHEAST NEBRASKA AND SOUTHEAST SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...IN NORTHWEST IOWA... LYON...OSCEOLA...PLYMOUTH AND SIOUX. IN SOUTHWEST MINNESOTA... COTTONWOOD...JACKSON...LINCOLN...LYON...MURRAY...NOBLES... PIPESTONE AND ROCK. IN NORTHEAST NEBRASKA...DAKOTA AND DIXON. IN SOUTHEAST SOUTH DAKOTA...CLAY...LINCOLN AND UNION. * THROUGH TUESDAY EVENING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 4 INCHES FROM TONIGHT THROUGH TUESDAY. A ROUND OF THUNDERSTORMS WITH HEAVY RAINFALL WILL BE POSSIBLE THIS EVENING...THEN ADDITIONAL SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ON TUESDAY AFTERNOON. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI RIVER AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ SDZ038>040-050-052>066-068-069-210400- /O.CON.KFSD.FF.A.0003.000000T0000Z-110622T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BEADLE-KINGSBURY-BROOKINGS-GREGORY-JERAULD-SANBORN-MINER-LAKE- MOODY-BRULE-AURORA-DAVISON-HANSON-MCCOOK-MINNEHAHA-CHARLES MIX- DOUGLAS-HUTCHINSON-TURNER-BON HOMME-YANKTON- INCLUDING THE CITIES OF...HURON...DE SMET...ARLINGTON... LAKE PRESTON...BROOKINGS...GREGORY...BURKE...WESSINGTON SPRINGS... ALPENA...WOONSOCKET...HOWARD...MADISON...FLANDREAU... CHAMBERLAIN...KIMBALL...PLANKINTON...WHITE LAKE...STICKNEY... MITCHELL...ALEXANDRIA...EMERY...SALEM...CANISTOTA...BRIDGEWATER... MONTROSE...SIOUX FALLS...WAGNER...PLATTE...LAKE ANDES...MARTY... ARMOUR...CORSICA...DELMONT...PARKSTON...FREEMAN...MENNO...TRIPP... PARKER...CENTERVILLE...MARION...VIBORG...HURLEY...CHANCELLOR... TYNDALL...SCOTLAND...SPRINGFIELD...AVON...TABOR...YANKTON 248 PM CDT MON JUN 20 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF EAST CENTRAL SOUTH DAKOTA...SOUTH CENTRAL SOUTH DAKOTA AND SOUTHEAST SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL SOUTH DAKOTA...BEADLE...BROOKINGS... JERAULD...KINGSBURY...LAKE...MINER...MOODY AND SANBORN. IN SOUTH CENTRAL SOUTH DAKOTA...BRULE...CHARLES MIX AND GREGORY. IN SOUTHEAST SOUTH DAKOTA...AURORA...BON HOMME...DAVISON... DOUGLAS...HANSON...HUTCHINSON...MCCOOK...MINNEHAHA...TURNER AND YANKTON. * THROUGH TUESDAY EVENING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF 2 TO 4 INCHES THROUGH THE DAY TUESDAY. IN ADDITION TO THE RAINFALL...RIVER FLOODING ALONG THE MISSOURI RIVER AND SATURATED SOIL WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
052 WGUS63 KFSD 210849 FFAFSD FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 349 AM CDT TUE JUN 21 2011 .AN AREA OF LOW PRESSURE CENTERED OVER EASTERN NEBRASKA WILL LIFT NORTH INTO WESTERN MINNESOTA TODAY. A BAND OF SHOWERS AND THUNDERSTORMS ORIENTED FROM NORTH TO SOUTH IS EXPECTED TO SET UP ACROSS CENTRAL SOUTH DAKOTA AFFECTING AREAS ALONG AND WEST OF THE JAMES RIVER. SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS FAR SOUTHEASTERN SOUTH DAKOTA....INTO SOUTHWESTERN MINNESOTA AND NORTHWESTERN IOWA THROUGH MUCH OF THE DAY. ADDITIONAL RAINFALL AMOUNTS TODAY ARE EXPECTED TO TOTAL TO ONE TO TWO INCHES ACROSS THE AREA...WITH LOCALLY HIGHER AMOUNTS. THE HEAVIEST PRECIPITATION IS EXPECTED ALONG AND EAST OF THE INTERSTATE 29 CORRIDOR...ESPECIALLY NORTH OF INTERSTATE 90. IAZ001-002-012-020-MNZ071-072-080-081-089-090-097-098-NEZ013-014- SDZ038>040-050-052>071-211700- /O.CON.KFSD.FF.A.0003.000000T0000Z-110622T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LYON-OSCEOLA-SIOUX-PLYMOUTH-LINCOLN-MURRAY-COTTONWOOD-NOBLES- JACKSON-PIPESTONE-ROCK-DIXON-DAKOTA-BEADLE-KINGSBURY-BROOKINGS- GREGORY-JERAULD-SANBORN-MINER-LAKE-MOODY-BRULE-AURORA-DAVISON- HANSON-MCCOOK-MINNEHAHA-CHARLES MIX-DOUGLAS-HUTCHINSON-TURNER- BON HOMME-YANKTON-CLAY-UNION- INCLUDING THE CITIES OF...ROCK RAPIDS...GEORGE...INWOOD... LARCHWOOD...SIBLEY...ORANGE CITY...SIOUX CENTER...LE MARS... TYLER...HENDRICKS...LAKE BENTON...IVANHOE...MARSHALL...SLAYTON... FULDA...WINDOM...MOUNTAIN LAKE...WORTHINGTON...JACKSON... LAKEFIELD...PIPESTONE...LUVERNE...WAKEFIELD...PONCA...ALLEN... SOUTH SIOUX CITY...HURON...DE SMET...ARLINGTON...LAKE PRESTON... BROOKINGS...GREGORY...BURKE...WESSINGTON SPRINGS...ALPENA... WOONSOCKET...HOWARD...MADISON...FLANDREAU...CHAMBERLAIN... KIMBALL...PLANKINTON...WHITE LAKE...STICKNEY...MITCHELL... ALEXANDRIA...EMERY...SALEM...CANISTOTA...BRIDGEWATER...MONTROSE... SIOUX FALLS...WAGNER...PLATTE...LAKE ANDES...MARTY...ARMOUR... CORSICA...DELMONT...PARKSTON...FREEMAN...MENNO...TRIPP...PARKER... CENTERVILLE...MARION...VIBORG...HURLEY...CHANCELLOR...CANTON... LENNOX...TEA...HARRISBURG...TYNDALL...SCOTLAND...SPRINGFIELD... AVON...TABOR...YANKTON...VERMILLION...NORTH SIOUX CITY... BERESFORD...ELK POINT...ALCESTER...JEFFERSON 349 AM CDT TUE JUN 21 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHWEST IOWA...SOUTHWEST MINNESOTA...NORTHEAST NEBRASKA AND SOUTH DAKOTA...INCLUDING THE FOLLOWING AREAS... IN NORTHWEST IOWA...LYON...OSCEOLA...PLYMOUTH AND SIOUX. IN SOUTHWEST MINNESOTA...COTTONWOOD...JACKSON...LINCOLN...LYON... MURRAY...NOBLES...PIPESTONE AND ROCK. IN NORTHEAST NEBRASKA... DAKOTA AND DIXON. IN SOUTH DAKOTA...AURORA...BEADLE...BON HOMME...BROOKINGS...BRULE...CHARLES MIX...CLAY...DAVISON... DOUGLAS...GREGORY...HANSON...HUTCHINSON...JERAULD... KINGSBURY...LAKE...LINCOLN...MCCOOK...MINER...MINNEHAHA... MOODY...SANBORN...TURNER...UNION AND YANKTON. * THROUGH THIS EVENING * SLOW MOVING THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL OF ONE TO TWO INCHES THROUGHOUT THE DAY TODAY. THIS RAINFALL ON TOP OF SATURATED CONDITIONS AND RIVER FLOODING WILL PROMOTE SIGNIFICANT RUNOFF. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ BT
272 WGUS63 KFSD 211553 FFAFSD FLOOD WATCH NATIONAL WEATHER SERVICE SIOUX FALLS SD 1053 AM CDT TUE JUN 21 2011 IAZ001-002-012-020-MNZ071-072-080-081-089-090-097-098-NEZ013-014- SDZ038>040-050-052>071-211700- /O.CAN.KFSD.FF.A.0003.000000T0000Z-110622T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LYON-OSCEOLA-SIOUX-PLYMOUTH-LINCOLN-MURRAY-COTTONWOOD-NOBLES- JACKSON-PIPESTONE-ROCK-DIXON-DAKOTA-BEADLE-KINGSBURY-BROOKINGS- GREGORY-JERAULD-SANBORN-MINER-LAKE-MOODY-BRULE-AURORA-DAVISON- HANSON-MCCOOK-MINNEHAHA-CHARLES MIX-DOUGLAS-HUTCHINSON-TURNER- BON HOMME-YANKTON-CLAY-UNION- INCLUDING THE CITIES OF...ROCK RAPIDS...GEORGE...INWOOD... LARCHWOOD...SIBLEY...ORANGE CITY...SIOUX CENTER...LE MARS... TYLER...HENDRICKS...LAKE BENTON...IVANHOE...MARSHALL...SLAYTON... FULDA...WINDOM...MOUNTAIN LAKE...WORTHINGTON...JACKSON... LAKEFIELD...PIPESTONE...LUVERNE...WAKEFIELD...PONCA...ALLEN... SOUTH SIOUX CITY...HURON...DE SMET...ARLINGTON...LAKE PRESTON... BROOKINGS...GREGORY...BURKE...WESSINGTON SPRINGS...ALPENA... WOONSOCKET...HOWARD...MADISON...FLANDREAU...CHAMBERLAIN... KIMBALL...PLANKINTON...WHITE LAKE...STICKNEY...MITCHELL... ALEXANDRIA...EMERY...SALEM...CANISTOTA...BRIDGEWATER...MONTROSE... SIOUX FALLS...WAGNER...PLATTE...LAKE ANDES...MARTY...ARMOUR... CORSICA...DELMONT...PARKSTON...FREEMAN...MENNO...TRIPP...PARKER... CENTERVILLE...MARION...VIBORG...HURLEY...CHANCELLOR...CANTON... LENNOX...TEA...HARRISBURG...TYNDALL...SCOTLAND...SPRINGFIELD... AVON...TABOR...YANKTON...VERMILLION...NORTH SIOUX CITY... BERESFORD...ELK POINT...ALCESTER...JEFFERSON 1053 AM CDT TUE JUN 21 2011 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHWEST IOWA...SOUTHWEST MINNESOTA...NORTHEAST NEBRASKA AND SOUTH DAKOTA HAS BEEN CANCELLED. SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE ACROSS THE AREA THROUGH THE DAY...HOWEVER ADDITIONAL RAINFALL AMOUNTS WILL BE A QUARTER TO HALF AN INCH...MAKING FLASH FLOODING UNLIKELY. $$
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Jun 18, 8:54 PM CDT, 6 hours 46 minutes earlier.
Area forecast discussion, Jun 18, 8:54 PM CDT, 6 hours 46 minutes before
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 854 PM CDT SAT JUN 18 2011 .DISCUSSION... MADE A FEW MINOR ADJUSTMENTS TO GOING FORECAST BUT NOTHING REAL NOTEWORTHY. WITH A LACK OF STRONG LOW LEVEL JET AND THETAE ADVECTION...IT APPEARS THE CONVECTION IN S CENTRAL SD WILL DIE OFF AFTER SUNSET. I DID RAISE POPS A SMIDGE IN OUR S CENTRAL SD ZONES EARLY THIS EVENING...BUT THEN RAPIDLY TAILED THEM OFF IN THE LATE EVENING. THE NEBRASKA CONVECTION ALONG I 80 IS HEADING EASTWARD AND LOOKS LIKE IT WILL NOT IMPACT ANY OF OUR ZONES. LEFT A VERY SMALL POP IN OUR EXTREME SE CORNER TO ACCOUNT FOR THIS ACTIVITY BUT IT IS INCREASINGLY LOOKING LIKELY THAT THOSE THUNDERSTORMS WILL NOT IMPACT THE SIOUX FALLS FORECAST AREA. WITH THE THUNDERSTORMS EITHER WANING OR MOVING AWAY...WE ARE THINKING THAT THE DENSE CIRRUS WILL GRADUALLY ERODE AFTER MIDNIGHT LEAVING MAINLY CLEAR SKIES. WITH EXTREMELY LIGHT WINDS...TIGHT DEW POINT DEPRESSIONS AND WET GROUND IN SOME AREAS...THERE COULD BE SOME PATCHY FOG ALONG AND EAST OF I 29 SO ADDED THOSE TO THE FORECAST. MINIMUM TEMPERATURES LOOK PRETTY SEASONABLE...STILL LOOKS LIKE MID 50S TO LOWER 60S. && .AVIATION... THUNDERSTORMS ACROSS CENTRAL SOUTH DAKOTA TO DIE OFF THIS EVENING. ANOTHER AREA OF THUNDERSTORMS OVER SOUTH-CENTRAL NEBRASKA SHOULD REMAIN SOUTH OF THE FORECAST AREA TONIGHT. CIRRUS WILL DISSIPATE AS THUNDERSTORMS ACTIVITY WANES. LIGHT WINDS UNDER WEAK HIGH PRESSURE AND CLEARING SKIES COULD ALLOW FOR SOME RADIATION FOG TOWARD SUNRISE AND THERE IS THE POTENTIAL FOR DENSE FOG TOWARD SUX. ANY FOG WILL QUICKLY ERODE AFTER SUNRISE. THUNDERSTORMS TO DEVELOP ACROSS NEBRASKA AND WESTERN SOUTH DAKOTA SUNDAY AFTERNOON...THEN SHOULD SPREAD ACROSS THE FORECAST AREA SUNDAY NIGHT. && .PREV DISCUSSION... SHORT WAVE MOVING THROUGH SOUTHEASTERN NE THIS AFTERNOON INTO WESTERN IOWA THIS EVENING COULD TOUCH OFF A FEW SCATTERED THUNDERSTORMS THROUGH MIDNIGHT ALONG AND SOUTH OF A YKN-MWM LINE... BUT THESE WILL BE BATTLING SOME DRIER MID LEVEL AIR THAT WILL BE SETTLING IN ACROSS EASTERN SD AND WESTERN MN. IT LOOKS LIKE MOST PRECIPITATION WILL STAY TO THE SOUTHEAST OF THE CWA THROUGH TONIGHT. OTHER SCATTERED THUNDERSTORMS WILL BE KICKING OFF IN THE WESTERN HIGH PLAINS LATE THIS AFTERNOON AND EVENING...BUT THESE SHOULD STAY WEST OF THE CWA AS THEY HANG CLOSER TO THE LOW. LIGHT NORTHEASTERLY WINDS THIS AFTERNOON WILL BECOME EAST OR SOUTHEAST OVERNIGHT. /MG THINK MUCH OF SUNDAY WILL REMAIN DRY AND WARM ACROSS THE AREA WITH CONVECTION DEVELOPING OVER WESTERN SOUTH DAKOTA EARLY IN THE DAY IN THE VICINITY OF DEEPENING SURFACE TROUGH OVER THAT AREA...THEN SLOWLY EXPANDING EASTWARD AS A SHORTWAVE IS EJECTED OUT OF THE WESTERN U.S. UPPER LEVEL TROUGH DURING THE AFTERNOON. THIS SHORTWAVE WILL TRACK OVER OUR COUNTY WARNING AREA ON SUNDAY NIGHT...IN CONJUNCTION WITH A LOW/MID LEVEL WARM FRONT WHICH WILL LIFT ACROSS OUR AREA DURING THE NIGHT. WITH THIS...WILL SEE SHOWERS AND THUNDERSTORMS OVER SOUTH CENTRAL SOUTH DAKOTA INCREASE FROM SOUTHWEST TO NORTHEAST DURING THE NIGHT...WITH THE POSSIBILITY OF SEVERE STORMS AS INSTABILITY AND SHEAR INCREASE FROM THE SOUTH. STILL SOME MODEL DISCREPANCIES WITH REGARD TO TRACK/TIMING OF THE SURFACE LOW/ASSOCIATED WARM FRONT PUSHING INTO THE AREA SOMETIME ON MONDAY...WITH THE NAM/CANADIAN OFFERING A MORE PROGRESSIVE/FARTHER EASTWARD SOLUTION THAN THE GFS/ECMWF. AS A RESULT...STILL SOME QUESTION AS TO WHEN THE SURFACE WARM FRONT WILL LIFT INTO OUR EASTERN AREAS...WHICH WILL IMPACT HIGH TEMPERATURES AND INITIATION OF CONVECTION ON MONDAY. ANTICIPATE AN OVERALL BREAK IN THE CONVECTION LATER ON MONDAY MORNING...AND THINK MUCH OF THE AREA WILL BECOME CAPPED BY EARLY MONDAY AFTERNOON AS MAX TEMPERATURES IN THE 800 TO 700 MB LAYER WILL REACH 14 C IN OUR FAR NORTH AND WEST...TO AROUND 21 C IN OUR FAR SOUTHEAST. EXPECTING REDEVELOPMENT IN THE AFTERNOON BACK TO THE WEST NEAR THE MAIN UPPER WAVE/AND THE SURFACE TRIPLE POINT...AS WELL AS TO THE NORTH OF THE WARM FRONT...WHEREVER THAT MAY END UP. AGAIN...THERE WILL MOST LIKELY BE A FEW SEVERE STORMS WITH ANY ACTIVITY THAT DEVELOPS. SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE AREA ON TUESDAY INTO TUESDAY NIGHT AS THE UPPER LEVEL LOW ONLY VERY SLOWLY TRACKS ACROSS THE REGION. UNFORTUNATELY THIS WILL CONTRIBUTE TO FLOODING WOES...WITH STORM TOTAL PRECIPITATION THROUGH THE SUNDAY NIGHT TO TUESDAY NIGHT TIME FRAME COMING IN AT AROUND 2.5 INCHES AROUND CHAMBERLAIN...TO AROUND 2 INCHES THROUGH THE JAMES RIVER VALLEY AND FROM BROOKINGS TO MARSHALL...WHILE CLOSER TO A HALF TO AN INCH ELSEWHERE ACROSS THE CWA. MODELS CONTINUE TO TREND COOLER FOR TUESDAY AND WEDNESDAY...AND AS PREVIOUS FORECASTER DID...TRIMMED HIGHS BACK A BIT MORE...INTO THE UPPER 60S/MID 70S TUESDAY AND MID 60S/LOWER 70S ON WEDNESDAY. UPPER LEVEL RIDGING BUILDS INTO THE REGION FOR THE END OF NEXT WEEK. EVEN SO...DAYTIME HIGHS LOOK TO REMAIN BELOW NORMAL INTO THE EARLY PART OF THE WEEKEND...AND CANNOT RULE OUT A FEW SHOWERS/THUNDERSTORMS SOMETIME IN THE FRIDAY TO SATURDAY TIME FRAME IN THE RETURN FLOW ON THE BACKSIDE OF A DEPARTING SURFACE RIDGE. /JM && .FSD WATCHES/WARNINGS/ADVISORIES... IA...NONE. MN...NONE. NE...NONE. SD...NONE. &&
Hazardous weather outlook, Jun 18, 11:42 AM CDT, 15 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1142 AM CDT SAT JUN 18 2011 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-191200- 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- 1142 AM CDT SAT JUN 18 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... SCATTERED THUNDERSTORMS WILL CONTINUE IN NORTHWESTERN IOWA INTO THIS AFTERNOON. ADDITIONAL SCATTERED THUNDERSTORMS COULD DEVELOP LATE THIS AFTERNOON INTO THIS EVENING FROM EASTERN NEBRASKA INTO PARTS OF SOUTHWESTERN MINNESOTA. THESE THUNDERSTORMS ARE NOT EXPECTED TO BECOME SEVERE. FLOODING... RECORD HIGH RELEASES ARE OCCURRING FROM THE MISSOURI RIVER RESERVOIRS AND WILL CONTINUE INTO MID SUMMER. HIGH WATER LEVELS WILL CAUSE SIGNIFICANT IMPACTS BETWEEN CHAMBERLAIN AND SIOUX CITY. MANY PORTIONS OF THE JAMES RIVER VALLEY WILL CONTINUE TO SEE MINOR TO MODERATE FLOODING THROUGH THE WEEKEND. THE LOWER PORTIONS OF THE BIG SIOUX RIVER WILL ALSO SEE MINOR FLOODING THIS WEEKEND. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS WESTERN SOUTH DAKOTA ON SUNDAY EVENING...WHICH MAY PROPAGATE INTO AREAS OF SOUTH CENTRAL SOUTH DAKOTA DURING THE NIGHT. A FEW OF THESE STORMS MAY BECOME SEVERE...WITH DAMAGING STRAIGHT LINE WINDS AS THE MAIN THREAT. A SECOND AREA OF THUNDERSTORMS WILL FORM ALONG A WARM FRONT IN SOUTH CENTRAL NEBRASKA ON SUNDAY AFTERNOON...WHICH MAY LIFT INTO PORTIONS OF NORTHEAST NEBRASKA AND NORTHWEST IOWA BY EARLY MONDAY MORNING. A FEW OF THESE STORMS COULD BECOME SEVERE...WITH LARGE HAIL AS THE MAIN THREAT. ON MONDAY...THE WARM FRONT WILL SHIFT INTO PORTIONS OF NORTHWEST IOWA. SHOWERS AND THUNDERSTORMS WILL BE ONGOING DURING THE MAJORITY OF DAY...HOWEVER A FEW OF THE THUNDERSTORMS ALONG THE FRONT MAY STRENGTHEN AND BECOME SEVERE DURING THE AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
Nearby
Flash Flood Watches in South Dakota, 2011Flash Flood Watches in Minnesota, 2011Flash Flood Watches in Iowa, 2011Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.