Alert archive / South Dakota / Flash Flood Warnings in 2018

Flash Flood Warning 4, NWS Rapid City, SD

May 22, 2018Lawrence County, Pennington County, South Dakota

NWS Rapid City, SD issued this flash flood warning at May 22, 2018, 3:43 PM MDT for Lawrence County, Pennington County, South Dakota. It was in force for 3 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: May 22, 2018, 3:43 PM MDT (21:43 UTC)
Expired: May 22, 2018, 6:33 PM MDT
In force: 3 hr
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Flood severity: None

Counties Lawrence County, SD, Pennington County, SD

The radar

The Rapid City radar (KUDX), 39 km from the middle of the area, began a volume at 21:46 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 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 May 22, 2:07 PM MDT, 1 hour 36 minutes earlier.

Area forecast discussion, May 22, 2:07 PM MDT, 1 hour 36 minutes before

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Hazardous weather outlook, May 22, 5:58 AM MDT, 9 hours 45 minutes before

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In the hours before

Special weather statement, May 22, 2:08 PM MDT, 1 hour 35 minutes before

Special Weather Statement
National Weather Service Rapid City SD
208 PM MDT TUE MAY 22 2018

SDZ024-028-222100-
Northern Black Hills SD-Central Black Hills SD-
208 PM MDT TUE MAY 22 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LAWRENCE AND WESTERN
PENNINGTON COUNTIES UNTIL 300 PM MDT...

At 207 PM MDT, Doppler radar was tracking a strong thunderstorm over
Roubaix Lake, or 9 miles south of Lead, moving northeast at 5 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Brownsville, Roubaix Lake, Crooks Tower and Black Fox Campground.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4410 10392 4420 10397 4437 10370 4417 10350
TIME...MOT...LOC 2007Z 237DEG 5KT 4422 10370

Pojorlie

Special weather statement, May 22, 2:37 PM MDT, 1 hour 6 minutes before

Special Weather Statement
National Weather Service Rapid City SD
237 PM MDT TUE MAY 22 2018

SDZ024-025-WYZ057-222115-
Northern Black Hills SD-Northern Foot Hills SD-
Wyoming Black Hills WY-
237 PM MDT TUE MAY 22 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL LAWRENCE AND
SOUTHEASTERN CROOK COUNTIES UNTIL 315 PM MDT...

At 237 PM MDT, Doppler radar was tracking a strong thunderstorm near
Cement Ridge Lookout, or 13 miles west of Lead, moving northeast at
10 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Lead, Central City, Moskee, Cheyenne Crossing, Iron Creek Lake,
O'Neil Pass, Roughlock Falls, Cement Ridge Lookout, Savoy, Bridal
Veil Falls, Crow Peak, Terry Peak and Spearfish Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4417 10403 4425 10422 4453 10404 4440 10371
TIME...MOT...LOC 2037Z 227DEG 7KT 4432 10403

Pojorlie

Special weather statement, May 22, 3:17 PM MDT, 26 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
May 22, 2:08 PM MDT	Special Weather Statement	UNR	Lawrence	52 min
May 22, 2:37 PM MDT	Special Weather Statement	UNR	Lawrence	38 min
May 22, 2:41 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	64 min
May 22, 3:17 PM MDT	Special Weather Statement	UNR	Lawrence	43 min
May 22, 3:41 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	64 min
May 22, 5:38 PM MDT	Special Weather Statement	UNR	Oglala Lakota	52 min
May 22, 5:52 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	53 min
May 22, 4:45 PM MDT	Severe Thunderstorm Warning	UNR	Crook	32 min
May 22, 5:27 PM MDT	Special Weather Statement	UNR	Crook	48 min

Nearby

Flash Flood Warnings in South Dakota, 2018 Every flash flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.