Alert archive / South Dakota / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 389, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 15, 2004, 10:15 AM CDT for Yankton County, South Dakota. 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
- Jul 15, 2004, 10:15 AM CDT (15:15 UTC)
- Expired
- Jul 15, 2004, 10:45 AM CDT
- In force
- 30 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 86 km from the middle of the area, began a volume at 15:18 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 |
|---|---|---|---|
| Jul 15, 10:30 AM CDT | HAIL 0.88 | 6 Ne Lesterville, SD | |
| Jul 15, 10:37 AM CDT | HAIL 0.88 | 8 Ne Lesterville, SD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
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 nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 3.3 hours before the alert went out and 215 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
- 95 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 1152 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KFSD 151515 SVRFSD SDC135-151545- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 1015 AM CDT THU JUL 15 2004 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN YANKTON COUNTY IN SOUTHEAST SOUTH DAKOTA * UNTIL 1045 AM CDT * AT 1013 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL. THIS STORM WAS LOCATED 17 MILES NORTH OF UTICA...OR ABOUT 25 MILES NORTHWEST OF YANKTON...MOVING SOUTH AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... UTICA AROUND 1045 AM CDT THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4317 9747 4317 9762 4290 9763 4293 9743 $$ CPJ
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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 15, 10:15 AM CDT, 0 minutes earlier.
Area forecast discussion, Jul 15, 10:15 AM CDT, 0 minutes before
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 1015 AM CDT THU JUL 15 2004 .DISCUSSION... CONVECTION STILL ONGOING ACROSS THE SOUTHERN CWA WITH AN ISOLATED SEVERE CELL SLIDING SOUTH JUST EAST OF THE JAMES RIVER PRODUCING UP TO ONE INCH HAIL THIS MORNING. COVERAGE OF ACTIVITY HAS BEEN DECREASING SOMEWHAT...AND EXPECT THIS TREND TO CONTINUE THROUGH NOON AS IT CONTINUES SOUTH TOWARD KSUX. MADE SOME ADJUSTMENTS TO WEATHER GRIDS TO SHIFT BETTER COVERAGE FARTHER EAST FOR REMAINDER OF THE MORNING...BUT WILL WAIT TO UPDATE ZFP UNTIL ALL MORNING WORDING CAN BE CLEANED UP AS PRECIP ENDS OVER THE CWA. THIS ACTIVITY WILL LEAVE SOME OUTFLOW BOUNDARIES LINGERING AROUND THE CWA...AND BEST CHANCES FOR AFTERNOON REDEVELOPMENT WILL REALLY KEY ON WHERE THESE BOUNDARIES END UP...ALONG WITH WHICH AREAS CLEAR SOON ENOUGH TO HAVE BEST RECOVERY FROM MORNING CONVECTION. THIS WOULD LEAD ME TO PUT BETTER CHANCES DURING THE LATE AFTERNOON ACROSS THE NORTHERN CWA AND MAY HAVE TO ADJUST CHANCE/SCATTERED RANGE POPS ACCORDINGLY...BUT WANT TO EVALUATE THESE PARAMETERS A LITTLE MORE CLOSELY AFTER EXISTING ACTIVITY DIMINISHES...SO WILL HOLD OFF ON ANY CHANGES TO GOING AFTERNOON FORECAST FOR A COUPLE MORE HOURS. TEMPERATURES WILL BE A LITTLE SLOWER TO CLIMB WITH THE CLOUD COVER AND SHOWERS IN THE SOUTH DURING THE LATE MORNING. HAVE TWEAKED HOURLY TEMP GRIDS TO ACCOUNT FOR THIS...BUT WILL LEAVE AFTERNOON HIGHS ALONE FOR NOW. && .PREV DISUCUSSION... FORECAST CONCERNS WILL BE CONVECTIVE CHANCES TODAY/TONIGHT AND TEMPS THROUGHOUT THE NEXT FEW DAYS. ONGOING CONVECTION ACROSS SOUTH CENTRAL NORTH DAKOTA ASSOCIATE WITH WEAK SHORT WAVE SLIDING SOUTH WILL POSE FIRST PROBLEM FOR THE FORECAST. TIGHT H850 THETA-E/STABILITY GRADIENT FROM EAST TO WEST THIS MORNING SO THERE SHOULD BE PRETTY SHARP CUTOFF TO HOW FAR EAST PRECIP CAN MAKE IT. EXPECT THIS AREA OF CONVECTION TO ENTER THE CWA AROUND 11Z AND THEN CONTINUE TO SLIDE SOUTH AND WEAKEN THROUGH THE MORNING HOURS...WILL KEEP HIGHEST POPS ALONG JAMES RIVER VALLEY AND POINTS WEST AND KEEP ALL POPS OUT EAST OF I29 AS THINGS LOOK JUST TO STABLE. AFTER FIRST ROUND OF CONVECTION WRAPS UP ATTENTION TURNS TO THE AFTERNOON AND EVENING AS ANOTHER ROUND OF MORE INTENSE CONVECTION GETS GOING. ETA STILL LOOKS A TAD HIGH ON DEWPOINTS AND CORRESPONDING INSTABILITY BUT VALUES OF 2000-2500 SHOULD BE EASY TO ATTAIN AS SFC HEATING GETS GOING. STORMS SHOULD FIRE OF A BOUNDARY ALONG A BOUNDARY RUNNING FROM ROUGHLY GREGORY TO BROOKINGS AND SLIDE SOUTHEAST MAINLY AFTER 21Z. WITH GIVEN INSTABILITY AND SPEED SHEAR IN THE 0-6 KM LAYER OF 40-50 KTS SHOULD GET SOME ORGANIZED CONVECTION AND A FEW SUPERCELLS...BUT LACK OF ANY STRONG SHEAR IN THE LOWEST LEVELS SHOULD KEEP SEVERE THREAT TO HAIL/WIND. AS BOUNDARY CLEARS CWA IN THE EVENING STORMS SHOULD END AND HIGH PRESSURE SHOULD SETTLE OVER THE REGION ONCE AGAIN. CURRENT FORECAST LOOKS TO BE IN DECENT SHAPE WITH RESPECT TO THIS AND ONLY LOWERED HIGHS A BIT BASED ON COOLER AIR MOVING INTO THE AREA. NEXT CHANCE FOR ANY PRECIP LOOKS TO BE ON SATURDAY MORNING AS STORMS SHOULD FIRE ON THE HIGH PLAINS DUE TO EASTERLY UPSLOPE FLOW AND STORM PROPAGATION VECTORS WOULD SUGGEST THE BEST CHANCE WOULD BE IN THE SOUTHWEST...DROPPING SHARPLY AS YOU GO NORTH AND EAST. && .FSD...WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && JH/JRM
Hazardous weather outlook, Jul 15, 6:58 AM CDT, 3 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTION NATIONAL WEATHER SERVICE SIOUX FALLS SD 658 AM CDT THU JUL 15 2004 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-161200- 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- 658 AM CDT THU JUL 15 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... AN AREA OF THUNDERSTORMS WILL SLIDE ACROSS THE AREA THIS MORNING. THESE STORMS WILL MAINLY BE LOCATED WEST OF THE SOUTH DAKOTA MINNESOTA BORDER AND MAY MAKE IT INTO EXTREME NORTHWEST IOWA. THESE STORMS ARE EXPECTED TO DECREASE IN COVERAGE DURING THE MORNING HOURS. AN ISOLATED SEVERE STORM COULD DEVELOP THIS MORNING WITH THE MAIN THREAT BEING HAIL THE SIZE OF NICKELS. AS A SURFACE AREA OF LOW PRESSURE ENTERS THE AREA IN THE AFTERNOON...MOIST UNSTABLE AIR WILL BE DRAWN INTO THE AREA. SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP AFTER 2 PM. THERE IS POTENTIAL FOR SEVERE STORMS TO DEVELOP. LARGE HAIL THE SIZE OF GOLF BALLS AND WIND GUSTS TO 70 MPH MAY ACCOMPANY THE STRONGER STORMS. ALTHOUGH THE THREAT FOR SEVERE WEATHER WILL EXIST ACROSS THE ENTIRE AREA TODAY...THE MOST FAVORED AREA APPEARS AT THIS TIME TO BE SOUTH OF A WESSINGTON SPRINGS SOUTH DAKOTA TO SPENCER IOWA LINE. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 2PM. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK. JRM
In the hours before
Local storm report, Jul 15, 9:12 AM CDT, 1 hour 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
912 AM CDT THU JUL 15 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0759 AM HAIL 9 S CAVOUR 44.24N 98.04W
07/15/2004 0.88 INCH BEADLE SD EMERGENCY MNGR
0845 AM HAIL 9 S ARTESIAN 43.88N 97.92W
07/15/2004 0.88 INCH SANBORN SD PUBLIC
&&
MDBLocal storm report, Jul 15, 9:31 AM CDT, 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
931 AM CDT THU JUL 15 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0928 AM HAIL 2 SW EMERY 43.58N 97.65W
07/15/2004 1.00 INCH HANSON SD TRAINED SPOTTER
&&
MDBLocal storm report, Jul 15, 9:50 AM CDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
950 AM CDT THU JUL 15 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0945 AM HAIL N CLAYTON 43.44N 97.66W
07/15/2004 0.88 INCH HUTCHINSON SD TRAINED SPOTTER
&&
MDBLocal storm report, Jul 15, 9:53 AM CDT, 22 minutes before
PRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
953 AM CDT THU JUL 15 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0759 AM HAIL 9 S CAVOUR 44.24N 98.04W
07/15/2004 0.88 INCH BEADLE SD EMERGENCY MNGR
0845 AM HAIL 9 S ARTESIAN 43.88N 97.92W
07/15/2004 0.88 INCH SANBORN SD PUBLIC
0928 AM HAIL 2 SW EMERY 43.58N 97.65W
07/15/2004 1.00 INCH HANSON SD TRAINED SPOTTER
0945 AM HAIL N CLAYTON 43.44N 97.66W
07/15/2004 0.88 INCH HUTCHINSON SD TRAINED SPOTTER
&&
MDBThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 8:41 AM CDT | Severe Thunderstorm Warning | FSD | Miner, Sanborn | 34 min |
| Jul 15, 9:07 AM CDT | Severe Thunderstorm Warning | FSD | Hanson | 23 min |
| Jul 15, 9:28 AM CDT | Severe Thunderstorm Warning | FSD | Hanson | 32 min |
| Jul 15, 9:38 AM CDT | Severe Thunderstorm Warning | FSD | Hutchinson | 37 min |
| Jul 15, 10:47 AM CDT | Severe Thunderstorm Warning | FSD | Yankton | 28 min |
| Jul 15, 5:19 PM CDT | Tornado Warning | FSD | Charles Mix | 26 min |
| Jul 15, 5:45 PM CDT | Tornado Warning | FSD | Charles Mix | 30 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2004Every severe thunderstorm warning in 2004
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.