Alert archive / South Dakota / Tornado Warnings in 2001
Tornado Warning 15, NWS Rapid City, SD
NWS Rapid City, SD issued this tornado warning at Jul 22, 2001, 9:39 PM MDT for Haakon County, South Dakota. It was in force for 51 min. 3 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 22, 2001, 9:39 PM MDT (03:39 UTC)
- Expired
- Jul 22, 2001, 10:30 PM MDT
- In force
- 51 min
- Issued by
- NWS Rapid City, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Haakon County, SD
The radar
The Rapid City radar (KUDX), 105 km from the middle of the area, began a volume at 03:42 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 22, 10:10 PM MDT | Hail 0.75 | Milesville, SD | |
| Jul 22, 10:15 PM MDT | Hail 1 | Billsburg, SD | |
| Jul 22, 10:15 PM MDT | Thunderstorm Wind 52 E | Billsburg, SD |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 3.7 hours before the alert went out and 258 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
- 2747 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 13.2
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Rapid City, SD wrote its last area forecast discussion before this tornado warning went out at Jul 22, 3:00 PM MDT, 6 hours 39 minutes earlier.
Area forecast discussion, Jul 22, 3:00 PM MDT, 6 hours 39 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 300 PM MDT SUN JUL 22 2001 S/WV TROF MOVG THRU ERN MT HAS TRIGGERED TSTMS OVR ERN MT THIS AFTN. MDLS WEAKEN SRN VORT BY 00Z...BUT IT CURRENTLY SHOWS NO SIGNS OF WEAKENING. MST OF ENERGY W/ THE TROF WL ROTATE THRU MT AND ND...BUT WL ALSO CLIP NERN WY AND NWRN SD. ASSOC CD FNT WL PUSH THRU SD OVRNITE...BUT AMS WL BCM MOR STABLE AFTER SUNSET. TMW LOOKS COOLER W/ LOWER TSTM POPS...BUT ANTHR S/WV IS PROGGED TO MOV OVR THE AREA MON NITE. ELY UPSLOP SFC WNDS WL INCRS THE CHC OF PRECIP FOR THE BLK HLS AND FOOTHILLS...W/ SMLR POPS OVR THE REST OF THE AREA. THEN WNDS BECOM SELY AGAIN BY TUES FOR MOR AFTN/EVE TSTMS. THE EXTENDED PTN IS MOR ZONAL/NRN FLOW AND CUTS OFF THE SWRN MSTR FEED...BUT S/WVS WL HELP TRIGGER TSTMS. .UNR...NONE. SANDERS
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 6:42 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding | 63 min |
| Jul 22, 7:40 PM MDT | Severe Thunderstorm Warning | UNR | Butte | 50 min |
| Jul 22, 8:05 PM MDT | Severe Thunderstorm Warning | UNR | Meade | 55 min |
| Jul 22, 8:57 PM MDT | Tornado Warning | UNR | Meade, Ziebach | 48 min |
| Jul 22, 9:31 PM MDT | Severe Thunderstorm Warning | UNR | Haakon | 44 min |
| Jul 22, 9:41 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence | 49 min |
| Jul 22, 10:30 PM MDT | Severe Thunderstorm Warning | UNR | Haakon | 45 min |
| Jul 22, 10:32 PM MDT | Severe Thunderstorm Warning | UNR | Meade | 43 min |
| Jul 22, 11:00 PM MDT | Severe Thunderstorm Warning | UNR | Meade | 45 min |
| Jul 23, 12:09 AM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson | 51 min |
| Jul 23, 5:35 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence | 55 min |
| Jul 22, 7:09 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 66 min |
| Jul 22, 8:39 PM MDT | Severe Thunderstorm Warning | UNR | Crook | 66 min |
| Jul 23, 4:46 PM MDT | Severe Thunderstorm Warning | UNR | Crook | 59 min |
| Jul 23, 5:25 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 50 min |
Nearby
Tornado Warnings in South Dakota, 2001Every tornado warning in 2001Tornadoes in 2001
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.