Severe Thunderstorm Warning 183, NWS Aberdeen, SD

Issued

Aug 28, 2002, 4:38 PM CDT (21:38 UTC)

Expired

Aug 28, 2002, 5:15 PM CDT

In force

37 min

Issued by

NWS Aberdeen, SD

Area

Counties, with a storm outline in the text

County Roberts County, SD

The Aberdeen radar (KABR), 133 km from the middle of the area, began a volume at 21:37 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.

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.

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

352 
WUUS53 KABR 282138
SVRABR
SDC109-282215-
/NEW.KABR.SV.W.0284.282137-282215/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
437 PM CDT WED AUG 28 2002

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ROBERTS COUNTY IN NORTHEAST SOUTH DAKOTA

* UNTIL 515 PM CDT

* AT 437 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES SOUTH OF ROSHOLT...OR ABOUT 12 MILES
  WEST OF WHEATON...MOVING NORTHEAST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ROSHOLT AROUND 500 PM CDT

THIS IS A DANGEROUS STORM. TAKE SHELTER NOW

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
ABERDEEN.

LAT...LON 4581 9692 4569 9675 4581 9660 4594 9671

BERG

NWS Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 28, 3:46 PM CDT, 52 minutes earlier.

AREA FORECAST DISCUSSION FOR CENTRAL/N-EAST SD AND W-CENTRAL MN
NATIONAL WEATHER SERVICE ABERDEEN SD
346 PM CDT WED AUG 28 2002

MAIN FORECAST CHALLENGE WILL BE COVERAGE AND SEVERITY OF CURRENT
CONVECTION ACROSS CWA...AND HOW LONG IT WILL PERSIST THROUGH
TONIGHT.

CURRENTLY HAVE A S/W MOVG SLOWLY ACROSS THE STATE THROUGH TONIGHT.
WITH DAYTIME HEATING AND LOW LVL MOISTURE IN PLACE...HAVE A FAIRLY
UNSTABLE ATMOSPHERE. 12Z SOUNDING SHOWS LIFTED INDICES AROUND -8 AND
APPROX 3000 J/KG CAPE...WITH ETA 00Z SOUNDING ALSO SHOWING SIMILAR
VALUES. WIND PROFILE CONTINUES TO BE RATHER WEAK AS IT HAS IN THE
PAST FEW DAYS...WITH 850MB WINDS OUT OF THE SSE AT ONLY 15KTS AND
500MB WINDS AROUND 10KTS. ALSO HAVE STATIONARY BOUNDARY IN PLACE
ACROSS REGION...STRETCHING FROM WESTERN SD NORTHEASTWARD INTO EAST
CENTRAL ND AND NORTHERN MN. FEEL TSRA THREAT WILL BE SCATTERED WITH
ONLY ISOLATED SEVERE CASES THIS EVENING. FOR TONIGHT...FEEL ISOLATED
SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THE OVERNIGHT HOURS
AS S/W WORKS IT WAY ACROSS THE STATE. ETA SHOWS NEXT CHANCE FOR
PRECIP BEGINNING LATE THU NIGHT INTO FRI AS NEXT SYSTEM APPROACHES
THE NRN PLAINS. LOOKS LIKE BEST CHANCE COMES DURING THE DAY ON FRI
AS TROUGH MOVES OVER NRN PLAINS. LOW LVL WINDS ALSO PICKUP ON FRI
THROUGHOUT THE DAYTIME AS 850MB JET INCREASES TO 30 TO 35KTS ACROSS
THE DAKOTAS. ALSO SHOW GOOD DYNAMICS ACROSS NE SD SO HAVE INCLUDED
CHANCE OF TSRAS FOR WHOLE CWA ON FRI INTO FRI NIGHT WITH TROUGH MOVG
THROUGH NRN PLAINS. THE ASSOCIATED COOL FRONT LOOKS TO MOVE THROUGH
AREA SAT AM BUT LOOKS AS IF MOST PRECIP ASSOCIATED WITH FRONT WILL
BE NORTH OF CWA INTO ND AND MN...AS A RESULT HAVE KEPT SAT DRY FOR
NOW.  ALBRECHT

.EXTENDED DISCUSSION...
THE TREND OF THE MDLS DURING THE EXTENDED PERIOD SUN-WED IS TO
WEAKEN THE WESTERN UNITED STATES 50H TROUGH THEN GO TO ZONAL FLOW
OR WNW FLOW ALONG THE NORTHERN PART OF THE U.S./SOUTHERN CANADA
FOLLOWED BY A DEEPENING NE PACIFIC TROUGH AND A BUILDING DOWNSTREAM
RIDGE OVER THE CENTRAL UNITED STATES. WITH THE MDLS HAVING THEIR
USUAL DIFFICULT TIME IN AGREEING ON THE TIMING AND THE STRENGTH OF
S/WS AND FRONTS WITH A TRANSITIONING PATTERN LIKE THIS...WILL LEAVE
IT DRY THROUGH THE FORECAST. IT ALSO LOOKS LIKE IT WILL WARM UP
THROUGH THE PERIOD WITH ABOVE NORMAL TEMPS.  MOHR

.ABR...NONE.

Severe Thunderstorm Warnings in South Dakota, 2002Every severe thunderstorm warning in 2002

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.