Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 263, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jul 30, 2001, 5:58 PM MDT for Fall River County, South Dakota. It was in force for 47 min. 2 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 30, 2001, 5:58 PM MDT (23:58 UTC)
- Expired
- Jul 30, 2001, 6:45 PM MDT
- In force
- 47 min
- Issued by
- NWS Rapid City, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Fall River County, SD
The radar
The Rapid City radar (KUDX), 113 km from the middle of the area, began a volume at 00:03 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 |
|---|---|---|---|
| Jul 30, 6:00 PM MDT | Thunderstorm Wind 65 E | Smithwick, SD | One large tree was uprooted and several power poles were blown down. |
| Jul 30, 6:20 PM MDT | Thunderstorm Wind 61 E | Oral, SD | Several tree limbs were broken off. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 30, 2:00 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 12.0 hours before the alert went out and 375 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
- 3835 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 severe thunderstorm 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 severe thunderstorm warning went out at Jul 30, 2:00 PM MDT, 3 hours 58 minutes earlier.
Area forecast discussion, Jul 30, 2:00 PM MDT, 3 hours 58 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 200 PM MDT MON JUL 30 2001 CURRENT SURFACE MAP HAS BOUNDARY FROM SOUTHWEST TO NORTH CENTRAL SOUTH DAKOTA...WITH WEAK LOW NEAR KD07. 60+ DEWPOINTS SOUTH OF THE BOUNDARY...AND WRAPPING AROUND THE NORTH SIDE OF THE LOW. AREA OF CONVECTION DEVELOPING OVER THE HIGHER TERRAIN OF EAST CENTRAL WYOMING THIS AFTERNOON AS WEAK SHORTWAVE LIFTS THROUGH THE AREA. FURTHER DEVELOPMENT ALONG THE BOUNDARY INTO SOUTHWEST SOUTH DAKOTA EXPECTED THIS EVENING...HOWEVER WILL BE FIGHTING A STRONG CAP IN PLACE. LATER TONIGHT...LOW LEVEL JET INCREASES OVER EASTERN HALF OF CWA. CONVECTIVE FEEDBACK ON THE ETA AND AVN INDICATING MCS TO DEVELOP ACROSS NORTHWEST SOUTH DAKOTA INTO NORTH DAKOTA. BOUNDARY SLIDES SOUTH ACROSS THE AREA TUESDAY...WITH WESTERN SOUTH DAKOTA/NORTHEAST WYOMING IN RIGHT ENTRANCE REGION OF THE JET. THIS WILL KEEP THE NORTHWEST CLOUDY AND COOLER WITH A CHANCE OF SHOWERS/THUNDERSTORMS THROUGH THE DAY. SOUTH CENTRAL COUNTIES WILL WARM UP AHEAD OF THE FRONT...WITH A ROUND OF AFTERNOON/EVENING THUNDERSTORMS. FORECAST SOUNDINGS SUPPORT SEASONAL TEMPERATURES ON WEDNESDAY WITH DRY CONDITIONS. UPPER LEVEL RIDGE BUILDS FOR THURSDAY AND FRIDAY...WITH TEMPERATURES CLIMBING BACK INTO THE 90S. UPPER LEVEL TROF TO MOVE THROUGH THE NORTHERN PLAINS THIS WEEKEND...SO INCLUDED A CHANCE OF THUNDERSTORMS BOTH DAYS. BACK TO SOME RIDGING FOR MONDAY. .UNR...NONE. KC
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 4:57 PM MDT | Severe Thunderstorm Warning | UNR | Fall River | 63 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2001Every severe thunderstorm warning 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.