Alert archive / South Dakota / Flash Flood Warnings in 1997

Flash Flood Warning 13, NWS Rapid City, SD

August 1, 1997Meade County, Pennington County, South Dakota

NWS Rapid City, SD issued this flash flood warning at Aug 1, 1997, 3:20 PM MDT for Meade County, Pennington County, South Dakota. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 1, 1997, 3:20 PM MDT (21:20 UTC)
Expired: Aug 1, 1997, 7:15 PM MDT
In force: 4 hr
Issued by: NWS Rapid City, SD
Area: Whole counties

Counties Meade County, SD, Pennington County, SD

The radar

The Rapid City radar (KUDX), 18 km from the middle of the area, began a volume at 21:20 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

Rapid City, SD (KUNR), launched 12:00Z, 9.3 hours before the alert went out and 26 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 212 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1754 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: -37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KRAP 012120
FFWRAP
SDC093-103-020115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD AND SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RAPID CITY SD
320 PM MDT FRI AUG 1 1997

* FLASH FLOOD WARNING FOR
  SOUTHWESTERN MEADE COUNTY - WESTERN SOUTH DAKOTA
  NORTH CENTRAL PENNINGTON COUNTY - WESTERN SOUTH DAKOTA

* UNTIL 715 PM MDT
 
* SOME STREAMS AND LOCATIONS AFFECTED
  BOX ELDER CREEK DOWNSTREAM OF NEMO
  STEAMBOAT ROCK PICNIC AREA

* CAUSE AND EFFECT
  A STATIONARY SEVERE THUNDERSTORM SOUTHEAST OF NEMO IS PRODUCING
  LARGE HAIL AND HEAVY RAIN ALONG BOX ELDER CREEK SOUTHEAST OF NEMO.
  HEAVY RAIN AND LOCALIZED FLASH FLOODING IS EXPECTED TO CONTINUE FOR
  SEVERAL HOURS.

* FORECAST CONDITIONS
P  HEAVY RAIN WILL CONTINUE ALONG BOX ELDER CREEK SOUTHEAST OF NEMO
 
CARPENTER/DURRETT

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Aug 1, 9:45 AM MDT, 5 hours 35 minutes earlier.

Area forecast discussion, Aug 1, 9:45 AM MDT, 5 hours 35 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
945 AM MDT FRI AUG 1 1997

CURRENT FORECAST PACKAGE LOOKS FINE FOR NOW.  THE ONLY FLY IN THE
OINTMENT MIGHT BE A LITTLE MORE EXTENSIVE THUNDERSTORM DEVELOPMENT
OVER THE BLACK HILLS, WHICH MIGHT SPREAD TO NEARBY ZONES, BUT WE
WILL WAIT FOR A FEW HOURS AND SEE HOW THE CHANGES IN THE AIRMASS
DURING THE DAY WILL AFFECT CONVECTIVE DEVELOPMENT BEFORE MAKING ANY
ADJUSTMENTS.  AN UNFAVORABLE LOW LEVEL WIND PROFILE AND REDUCED
MOISTURE MAKE SIGNIFICANT THUNDERSTORM DEVELOPMENT VERY UNLIKELY
TODAY OR TONIGHT.  CONDITIONS ON SATURDAY MAY BE A LITTLE MORE
FAVORABLE.

.UNR...NONE.

CARPENTER

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 1, 3:20 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	4 hr
Aug 1, 4:15 PM MDT	Severe Thunderstorm Warning	UNR	Custer	35 min
Aug 1, 4:44 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	61 min

Nearby

Flash Flood Warnings in South Dakota, 1997 Every flash flood warning in 1997

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.