Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 76, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jul 20, 2002, 9:15 PM MDT for Pennington County, South Dakota. It was in force for 15 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2002, 9:15 PM MDT (03:15 UTC)
- Expired
- Jul 20, 2002, 9:30 PM MDT
- In force
- 15 min
- Issued by
- NWS Rapid City, SD
- Area
- Counties, with a storm outline in the text
County Pennington County, SD
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 3.3 hours before the alert went out and 9 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.
- Mixed-layer CAPE
- 251 J/kg
- Mixed-layer CIN
- -242 J/kg
- Mixed-layer LCL
- 1975 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 384 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.8
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 20, 7:22 PM MDT, 1 hour 53 minutes earlier.
Area forecast discussion, Jul 20, 7:22 PM MDT, 1 hour 53 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 722 PM MDT SAT JUL 20 2002 THE FORECAST WAS UPDATED TO MENTION LOCALLY HEAVY RAINFALL ACROSS SOUTHWESTERN AND SOUTH-CENTRAL SD...OTHERWISE NO MAJOR CHANGES WERE MADE. TONIGHT IS AGAIN QUITE SIMILAR TO LAST NIGHT...EXCEPT THAT THE MOISTURE AND INSTABILITY AXES ARE SHIFTED SLIGHTLY EASTWARD. THE MAIN THUNDERSTORM CLUSTER WAS TAKING SHAPE OVER OUR SOUTHWESTERN CWFA...AND THIS IS EXPECTED TO MOVE/DEVELOP EAST-NORTHEASTWARD ACROSS SOUTHERN SD. THE SURFACE BOUNDARY THAT HAS BEEN AROUND FOR THE LAST SEVERAL DAYS HAS NOW PUSHED INTO SOUTH-CENTRAL SD...AND IT WILL NOT MOVE MUCH FOR THE REST OF THE EVENING. THE MAIN DIFFERENCE BETWEEN TONIGHT AND OTHER NIGHTS IS THE RATHER STRONG FRONTOGENESIS ZONE IN THE LOWER ATMOSPHERE...WHICH STRETCHES ACROSS THE SOUTHERN CWFA. AS THE LOW-LEVEL JET STRENGTHENS AND IMPINGES ON THIS FRONTAL ZONE LATER TONIGHT...EXPECT MOISTURE CONVERGENCE TO LEAD TO SOME LOCALLY HEAVY RAINFALL...WITH TRAINING AND SLOW-MOVING CELLS BASED ON THE THICKNESS PATTERN AND CORFIDI VECTORS. NOT ENOUGH CONFIDENCE FOR A FLOOD WATCH AT THIS TIME...BUT ONE MAY BE NEEDED AS THE EVENT UNFOLDS. .UNR...NONE. MJB
In the hours before
Local storm report, Jul 20, 5:02 PM MDT, 4 hours 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
502 PM MDT SAT JUL 20 2002
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1250 AM 8 NW USTA SD 1 INCH HAIL
07/20/02 PERKINS REPORTED BY STORM
SPOTTER.
1250 AM 8 NW USTA SD WIND DAMAGE
07/20/02 PERKINS REPORTED BY STORM
SPOTTER.
0130 AM 2 W GLAD VLY SD 60 MPH TSTM GUST
07/20/02 ZIEBACH REPORTED BY STORM
SPOTTER. TREE BRANCHES
BROKEN.Local storm report, Jul 20, 5:41 PM MDT, 3 hours 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
541 PM MDT SAT JUL 20 2002
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0307 PM 2 NE SILVER CITY SD 1.5 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER. LOTS OF 1.0 TO
1.5 INCH HAIL.
0426 PM 4 N DEERFIELD SD .75 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER.
0435 PM 8 SE NEWELL SD 1 INCH HAIL
07/20/02 BUTTE REPORTED BY STORM
SPOTTER. NICKEL TO
QUARTER SIZE HAIL.
LEFT-MOVING SUPERCELL
WITH PERSISTENT HAIL
SPIKE.
0507 PM 2 N BLACK HAWK SD .88 INCH HAIL
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
0507 PM 2 N BLACK HAWK SD 60 MPH TSTM GUST
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
ZCZC FSDLSRRAP ALL
TTAA00 KRAP DDHHMM
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
541 PM MDT SAT JUL 20 2002
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0307 PM 2 NE SILVER CITY SD 1.5 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER. LOTS OF 1.0 TO
1.5 INCH HAIL.
0426 PM 4 N DEERFIELD SD .75 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER.
0435 PM 8 SE NEWELL SD 1 INCH HAIL
07/20/02 BUTTE REPORTED BY STORM
SPOTTER. NICKEL TO
QUARTER SIZE HAIL.
LEFT-MOVING SUPERCELL
WITH PERSISTENT HAIL
SPIKE.
0507 PM 2 N BLACK HAWK SD .88 INCH HAIL
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
0507 PM 2 N BLACK HAWK SD 60 MPH TSTM GUST
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
ZCZC FSDLSRRAP ALL
TTAA00 KRAP DDHHMM
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
541 PM MDT SAT JUL 20 2002
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0307 PM 2 NE SILVER CITY SD 1.5 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER. LOTS OF 1.0 TO
1.5 INCH HAIL.
0426 PM 4 N DEERFIELD SD .75 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER.
0435 PM 8 SE NEWELL SD 1 INCH HAIL
07/20/02 BUTTE REPORTED BY STORM
SPOTTER. NICKEL TO
QUARTER SIZE HAIL.
LEFT-MOVING SUPERCELL
WITH PERSISTENT HAIL
SPIKE.
0507 PM 2 N BLACK HAWK SD .88 INCH HAIL
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
0507 PM 2 N BLACK HAWK SD 60 MPH TSTM GUST
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
ZCZC FSDLSRRAP ALL
TTAA00 KRAP DDHHMM
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
624 PM MDT SUN JUL 21 2002
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0858 PM 3 S RAPID CITY SD 65 MPH TSTM GUST
07/20/02 PENNINGTON REPORTED BY OFF-DUTY
NWS EMPLOYEE. EXTENSIVE
TREE DAMAGE. SHINGLES
OFF A FEW HOUSES.
0900 PM CAPUTA SD WIND DAMAGE
07/20/02 PENNINGTON REPORTED BY RETIRED NWS
EMPLOYEE. EXTENSIVE
TREE DAMAGE WITH A FEW
BIG TREES DOWN.
0925 PM 3 E NEW UNDERWOOD SD 60 MPH TSTM GUST
07/20/02 PENNINGTON REPORTED BY PUBLIC.
THREE-INCH TREE LIMBS
DOWN.
1130 PM KADOKA SD 60-65 MPH TSTM GUST
07/20/02 JACKSON REPORTED BY LAW
ENFORCEMENT OFFICIAL.
BunkersLocal storm report, Jul 20, 6:00 PM MDT, 3 hours 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
600 PM MDT SAT JUL 20 2002
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0307 PM 2 NE SILVER CITY SD 1.5 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER. LOWS OF 1.0 TO
1.5 INCH HAIL.
0426 PM 4 N DEERFIELD SD .75 INCH HAIL
07/20/02 PENNINGTON REPORTED BY STORM
SPOTTER.
0435 PM 8 SE NEWELL SD 1 INCH HAIL
07/20/02 BUTTE REPORTED BY STORM
SPOTTER. NICKEL TO
QUARTER SIZE HAIL.
LEFT-MOVING SUPERCELL
WITH PERSISTENT HAIL
SPIKE.
0507 PM 2 N BLACK HAWK SD .88 INCH HAIL
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.
0507 PM 2 N BLACK HAWK SD 60 MPH TSTM GUST
07/20/02 MEADE REPORTED BY OFF-DUTY
NWS EMPLOYEE.The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:15 PM MDT | Severe Thunderstorm Warning | UNR | Custer | 45 min |
| Jul 20, 8:35 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 40 min |
| Jul 20, 9:00 PM MDT | Severe Thunderstorm Warning | UNR | Meade | 75 min |
| Jul 20, 11:10 PM MDT | Severe Thunderstorm Warning | UNR | Jackson, Mellette | 50 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2002Every severe thunderstorm 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.