Alert archive / South Dakota / Flash Flood Warnings in 2003

Flash Flood Warning 8, NWS Rapid City, SD

August 17, 2003Custer County, South Dakota

NWS Rapid City, SD issued this flash flood warning at Aug 17, 2003, 10:49 PM MDT for Custer County, South Dakota. It was in force for 6 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 17, 2003, 10:49 PM MDT (04:49 UTC)
Expired: Aug 18, 2003, 5:00 AM MDT
In force: 6 hr
Issued by: NWS Rapid City, SD
Area: Counties, with a storm outline in the text

County Custer County, SD

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 4.8 hours before the alert went out and 406 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: 452 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1647 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 457 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 7.2

Open this sounding in Storm Lab

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 17, 7:20 PM MDT, 3 hours 29 minutes earlier.

Area forecast discussion, Aug 17, 7:20 PM MDT, 3 hours 29 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
720 PM MDT SUN AUG 17 2003

HAVE UPDATED ZONES TO INCREASE PCPN COVERAGE ACROSS AREA. HAVE ALSO
UPDATED WINDS AS THEY HAVE SHIFTED TO NW OVR ALL BUT FAR S-CENT SD.

.UNR...NONE.

Hazardous weather outlook, Aug 17, 6:30 AM MDT, 16 hours 19 minutes before

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-181230-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
630 AM MDT SUN AUG 17 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND
NORTHEASTERN WYOMING.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON AND PERSIST
THROUGH THE EVENING...MORE NUMEROUS OVER NORTHEASTERN WYOMING AND
FAR NORTHWESTERN SOUTH DAKOTA. THESE STORMS ARE NOT EXPECTED TO
BECOME SEVERE...HOWEVER STRONGER STORMS MAY PRODUCE GUSTY WINDS AND
SMALL HAIL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE MONDAY THROUGH
TUESDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

In the hours before

Local storm report, Aug 17, 8:00 PM MDT, 2 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
800 PM MDT SUN AUG 17 2003

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

0635 PM    1 E ARGYLE                SD   1 INCH HAIL
08/17/03   CUSTER                         REPORTED BY PUBLIC.

Local storm report, Aug 17, 8:41 PM MDT, 2 hours 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 6:18 PM MDT	Severe Thunderstorm Warning	UNR	Custer	57 min
Aug 17, 7:17 PM MDT	Severe Thunderstorm Warning	UNR	Custer	58 min
Aug 17, 8:34 PM MDT	Flash Flood Warning	UNR	Custer	3 hr

Nearby

Flash Flood Warnings in South Dakota, 2003 Every flash flood warning in 2003

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.