Alert archive / South Dakota / Flash Flood Warnings in 2002

Flash Flood Warning 3, NWS Rapid City, SD

August 8, 2002Lawrence County, South Dakota

NWS Rapid City, SD issued this flash flood warning at Aug 8, 2002, 4:00 PM MDT for Lawrence 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 outline as issued.

The facts

Issued: Aug 8, 2002, 4:00 PM MDT (22:00 UTC)
Expired: Aug 8, 2002, 8:00 PM MDT
In force: 4 hr
Issued by: NWS Rapid City, SD
Area: Counties, with a storm outline in the text

County Lawrence County, SD

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood 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

Rapid City, SD (KUNR), launched 12:00Z, 10.0 hours before the alert went out and 81 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: 165 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1511 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 89 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 
WGUS53 KUNR 082200
FFWRAP
SDC081-090200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RAPID CITY SD
400 PM MDT THU AUG 8 2002

THE NATIONAL WEATHER SERVICE IN RAPID CITY SD HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LAWRENCE COUNTY IN WEST CENTRAL SOUTH DAKOTA

* UNTIL 800 PM MDT

* AT 357 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THUNDERSTORMS WITH A HISTORY OF PRODUCING UP TO AN INCH OF RAIN    
  WERE PUSHING INTO LAWRENCE COUNTY.

* FORECAST INFORMATION...THE STORMS PUSHING INTO LAWRENCE COUNTY ARE 
CAPABLE OF PRODUCING FLASH FLOODING...ESPECIALLY IN AREAS BURNED BY 
FOREST FIRES.  THIS INCLUDES WHISTLERS...HOSPITAL AND SPRUCE GULCHES 
IN THE DEADWOOD AREA.

FLASH FLOODING IS IMMINENT OR OCCURRING. TAKE IMMEDIATE ACTION TO
PROTECT YOUR LIFE AND PROPERTY IF YOU LIVE ALONG A STREAM OR CREEK IN
THESE AREAS. DO NOT WALK OR DRIVE ACROSS ANY LOCATION WHERE WATER
COVERS THE GROUND

LAT...LON 4462 10355 4414 10357 4414 10407 4459 10409

T. MURPHY

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 8, 1:55 PM MDT, 2 hours 5 minutes earlier.

Area forecast discussion, Aug 8, 1:55 PM MDT, 2 hours 5 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
155 PM MDT THU AUG 8 2002

...SEVERE THUNDERSTORM WATCH ENTIRE AREA EXCEPT CAMPBELL COUNTY
WYOMING THIS EVENING...
VIGOROUS PACIFIC SHORT WAVE MOVING INTO THE NORTHERN PLAINS THIS
AFTERNOON WILL CONTINUE TO PRODUCE INTENSE THUNDERSTORM ACTIVITY AS
IT MOVES OUT OF SOUTHERN MONTANA INTO NORTHEAST WYOMING AND WESTERN
SOUTH DAKOTA. FORECAST HODOGRAPHS INDICATE A PREFERENCE FOR LINEAR
ORGANIZATION...STRONG WINDS AND LARGE HAIL. THE WINDS ARE OF
PARTICULAR CONCERN FOR NWRN SD...N AND NE OF THE BLACK HILLS...SINCE
THE SHORT WAVE WILL CONTRIBUTE 50+ MPH WIND SPEEDS TO THE MID LEVELS
OF THE ATMOSPHERE ACROSS WRN SD BY MIDNIGHT.  SEVERE WEATHER
OPERATIONS IN PROGRESS AT UNR.

ONLY MINOR ADJUSTMENTS WERE MADE TO LATER PERIODS OF THE PACKAGE. A
SOMEWHAT UNSTABLE NW FLOW WILL KEEP THE WEATHER MODERATELY ACTIVE
THROUGH THE END OF THE WEEK...THEN LARGE SCALE SUBSIDENCE AND DRY
AIR WILL PROVIDE A RESPITE FROM MIDDAY SATURDAY THROUGH SUNDAY.
SUMMERTIME HEATING AND A WEAK MID LEVEL SHORT WAVE WILL PRODUCE SOME
WEATHER MON AND TUE...WITH FAIR SKIES DOMINATING WED AND THU.

.UNR...NONE.

CARPENTER

In the hours before

Local storm report, Aug 8, 11:31 AM MDT, 4 hours 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
1131 AM MDT THU AUG 08 2002

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0945 PM    3 NW FAIRPT               SD   65 MPH TSTM GUST
08/07/02   MEADE                          REPORTED BY PUBLIC.

1000 PM    1 S REVA                  SD    MPH TSTM GUST
08/07/02   HARDING                        EVENT DURATION 30
                                          MINUTES. REPORTED BY
                                          STORM SPOTTER.

1003 PM    ZEONA                     SD   70 MPH TSTM GUST
08/07/02   PERKINS                        REPORTED BY PUBLIC.

1030 PM    PRAIRIE CITY              SD   60 MPH TSTM GUST
08/07/02   PERKINS                        REPORTED BY STORM
                                          SPOTTER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 8:44 PM MDT	Severe Thunderstorm Warning	UNR	Harding	46 min
Aug 7, 9:39 PM MDT	Severe Thunderstorm Warning	UNR	Meade	51 min
Aug 7, 9:53 PM MDT	Severe Thunderstorm Warning	UNR	Harding, Perkins	67 min
Aug 8, 1:12 PM MDT	Severe Thunderstorm Warning	UNR	Todd	48 min
Aug 8, 2:09 PM MDT	Severe Thunderstorm Warning	UNR	Harding	66 min
Aug 8, 3:01 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	59 min
Aug 8, 3:16 PM MDT	Severe Thunderstorm Warning	UNR	Fall River	59 min
Aug 8, 3:21 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence	54 min
Aug 8, 3:50 PM MDT	Severe Thunderstorm Warning	UNR	Butte	55 min
Aug 8, 4:11 PM MDT	Severe Thunderstorm Warning	UNR	Meade	64 min
Aug 8, 4:18 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	57 min
Aug 8, 5:15 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	60 min
Aug 8, 5:39 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	51 min
Aug 8, 5:43 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson, Ziebach	47 min

Nearby

Flash Flood Warnings in South Dakota, 2002 Every flash flood warning in 2002

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.