Alert archive / South Dakota / Tornado Warnings in 2017
Tornado Warning 40, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Sep 19, 2017, 11:04 PM CDT for 4 counties in South Dakota. It was in force for 26 min. 1 report 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
- Sep 19, 2017, 11:04 PM CDT (04:04 UTC)
- Expired
- Sep 19, 2017, 11:30 PM CDT
- In force
- 26 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Lake County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD
The radar
The Sioux Falls radar (KFSD), 31 km from the middle of the area, began a volume at 04:03 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 |
|---|---|---|---|
| Sep 19, 11:27 PM CDT | TSTM WND DMG | Dell Rapids, SD | TREE SNAPPED IN DELL RAPIDS...REPORT VIA SOCIAL MEDIA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 19, 3:37 PM CDT | Tornado Watch | SPC | 8 hr |
| Sep 19, 10:36 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 4.1 hours before the alert went out and 167 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
- 2563 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1127 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 239 m²/s²
- Significant tornado parameter
- 2.6
- Supercell composite
- 16.8
The text
As transmitted.
302
WFUS53 KFSD 200404
TORFSD
SDC079-087-099-101-200430-
/O.NEW.KFSD.TO.W.0040.170920T0404Z-170920T0430Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
1104 PM CDT TUE SEP 19 2017
The National Weather Service in Sioux Falls has issued a
* Tornado Warning for...
Southwestern Moody County in east central South Dakota...
Southeastern Lake County in east central South Dakota...
Northern Minnehaha County in southeastern South Dakota...
Northeastern McCook County in southeastern South Dakota...
* Until 1130 PM CDT
* At 1104 PM CDT, a severe thunderstorm capable of producing a
tornado was located near Montrose, or 10 miles north of Lake
Vermillion State Recreation Area, moving east at 50 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Colton and Chester around 1120 PM CDT.
Dell Rapids and Baltic around 1130 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 4370 9717 4386 9725 4397 9671 4377 9659
TIME...MOT...LOC 0404Z 255DEG 44KT 4375 9715
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Hanko2 follow-up statements
587
WWUS53 KFSD 200413
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1113 PM CDT TUE SEP 19 2017
SDC087-200423-
/O.CAN.KFSD.TO.W.0040.000000T0000Z-170920T0430Z/
McCook SD-
1113 PM CDT TUE SEP 19 2017
...THE TORNADO WARNING FOR NORTHEASTERN MCCOOK COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A tornado watch remains in effect until midnight CDT for east central
South Dakota.
A severe thunderstorm watch remains in effect until 500 AM CDT for
southeastern and east central South Dakota.
LAT...LON 4372 9704 4385 9709 4397 9671 4377 9659
TIME...MOT...LOC 0413Z 255DEG 44KT 4378 9700
$$
SDC079-099-101-200430-
/O.CON.KFSD.TO.W.0040.000000T0000Z-170920T0430Z/
Moody SD-Lake SD-Minnehaha SD-
1113 PM CDT TUE SEP 19 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT FOR
SOUTHWESTERN MOODY...SOUTHEASTERN LAKE AND NORTHERN MINNEHAHA
COUNTIES...
At 1113 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Colton, or 15 miles northeast of Lake Vermillion
State Recreation Area, moving east at 50 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Dell Rapids and Baltic around 1130 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 4372 9704 4385 9709 4397 9671 4377 9659
TIME...MOT...LOC 0413Z 255DEG 44KT 4378 9700
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Hanko609
WWUS53 KFSD 200423
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1123 PM CDT TUE SEP 19 2017
SDC079-099-101-200433-
/O.EXP.KFSD.TO.W.0040.000000T0000Z-170920T0430Z/
Moody SD-Lake SD-Minnehaha SD-
1123 PM CDT TUE SEP 19 2017
...THE TORNADO WARNING FOR SOUTHWESTERN MOODY...SOUTHEASTERN LAKE AND
NORTHERN MINNEHAHA COUNTIES WILL EXPIRE AT 1130 PM CDT...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.
A tornado watch remains in effect until midnight CDT for east central
South Dakota.
A severe thunderstorm watch remains in effect until 500 AM CDT for
southeastern and east central South Dakota.
LAT...LON 4372 9704 4385 9709 4397 9671 4377 9659
TIME...MOT...LOC 0423Z 255DEG 44KT 4381 9684
$$
HankoThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 7:59 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 31 min |
| Sep 19, 8:08 PM CDT | Tornado Warning | FSD | Beadle | 22 min |
| Sep 19, 8:38 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Beadle, Jerauld, Sanborn | 52 min |
| Sep 19, 8:53 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Brule | 52 min |
| Sep 19, 8:57 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 48 min |
| Sep 19, 9:17 PM CDT | Tornado Warning | FSD | Aurora, Brule | 28 min |
| Sep 19, 9:21 PM CDT | Severe Thunderstorm Warning | FSD | Beadle, Jerauld, Kingsbury, Miner, Sanborn | 39 min |
| Sep 19, 9:41 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Davison, Hanson, Sanborn | 49 min |
| Sep 19, 9:55 PM CDT | Severe Thunderstorm Warning | FSD | Beadle, Kingsbury, Miner, Sanborn | 46 min |
| Sep 19, 10:00 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Davison, Douglas, Hanson, Hutchinson | 45 min |
| Sep 19, 10:15 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury, Lake, Miner, Sanborn | 45 min |
| Sep 19, 10:39 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, Kingsbury, Lake, McCook, Miner, Minnehaha and 1 more | 36 min |
| Sep 19, 11:08 PM CDT | Severe Thunderstorm Warning | FSD | Brookings, Lake, McCook, Minnehaha, Moody | 52 min |
| Sep 19, 11:29 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha | 46 min |
| Sep 19, 11:47 PM CDT | Severe Thunderstorm Warning | FSD | Brookings | 43 min |
Nearby
Tornado Warnings in South Dakota, 2017Every tornado warning in 2017Tornadoes in 2017
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.