Alert archive / South Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 113, NWS Aberdeen, SD
NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 27, 1999, 3:44 PM CDT for Sully County, South Dakota. It was in force for 36 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 27, 1999, 3:44 PM CDT (20:44 UTC)
- Expired
- Jul 27, 1999, 4:20 PM CDT
- In force
- 36 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Sully County, SD
The radar
The Aberdeen radar (KABR), 158 km from the middle of the area, began a volume at 20:45 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 27, 3:58 PM CDT | Hail 1.75 | Onida, SD | |
| Jul 27, 4:00 PM CDT | Hail 0.75 | Onida, SD |
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.
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 8.7 hours before the alert went out and 138 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
- 3 J/kg
- Mixed-layer CIN
- -442 J/kg
- Mixed-layer LCL
- 1364 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KABR 272046 SVRABR SDC119-272120- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ABERDEEN SD 344 PM CDT TUE JUL 27 1999 THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN SULLY COUNTY IN CENTRAL SOUTH DAKOTA * UNTIL 420 PM CDT * AT 343 PM CDT... ABERDEEN DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 16 MILES SOUTH OF GETTYSBURG OR 9 MILES SOUTHEAST OF AGAR MOVING EAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL... REMAIN OVER OPEN COUNTRY EAST OF AGAR AND ONEIDA GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! A TORNADO WATCH IS IN EFFECT. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING! AP/RE
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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 2:57 PM CDT, 47 minutes earlier.
Area forecast discussion, Jul 27, 2:57 PM CDT, 47 minutes before
AREA FORECAST DISCUSSION FOR CENTRAL/NORTHCENTRAL AND NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA NATIONAL WEATHER SERVICE ABERDEEN SD 300 PM CDT TUE JULY 27 1999 FORECAST PROBLEM REVOLVES AROUND CONVECTION THIS EVENING AND TONIGHT. SFC TROF NOW IN WESTERN CWA AND MOVING EAST. MOISTURE CONTS TO POOL AHEAD OF THE TROF...WITH MID TO UPPER 70S FOR DWPTS EXPECTED. 17Z GOES SOUNDER HAS CAPES INVOF 32 KJ/KG...WHICH IS ACTUALLY LINES UP WELL WITH 18Z KABR SOUNDING THAT SPC ORDERED. MODIFYING 18Z SOUNDING FOR EXPECTED HIGHS/DWPTS SHOWS THAT CAP ERODES COMPLETELY WITH CAPES AROUND 59 KJ/KG WITH LI'S TO -14. ETA BUFKIT SHOWS THAT PWATS INCREASE TO NEAR 1.75 INCHES FROM 22Z TO 04Z TNT. DIRECTIONAL SHEAR A BIT LACKING...BUT POSSIBLY MADE UP WITH SPEED SHEAR. ETA SHOWS WEAK 5H VORT MAX SLIDING THROUGH FROM 06-12Z...WHILE 7H VORT MAX MOVES THROUGH 00-06Z. BY 00Z THETA-E RIDGE POPS UP IN WRN SD...MOVING INTO THE ERN CWA BY 06Z. WILL GO WITH FAIRLY HIGH POPS THIS EVENING AND TONIGHT. ETA ALSO SHOWS DEEP MOISTURE PLUME WORKING UP FROM DESERT SW AREA. DUE TO THIS...WILL ALSO MENTION HEAVY RAIN. ON WED...MDLS SHOW DRY AIR SLIDING IN A LOW LEVELS BEHIND TROF/COLD FRONT. WITH RIDGE BUILDING...THIS SHOULD ALLOW TEMPS TO CLIMB NICELY. SAME HOLDS FOR THURSDAY. WILL FOLLOW MOS TEMPS...AS THEY SEEM REASONABLE. ...EXTENDED FORECAST DISCUSSION... COLD FRONT WILL SWEEP ACROSS THE AREA ON FRIDAY BRINGING A CHANCE OF THUNDERSTORMS TO THE REGION. COLD FRONT WILL PUSH EAST OF THE AREA BY SATURDAY MORNING BRINGING COOLER AND DRIER CONDITIONS. COLD FRONT SHOULD STALL SOUTH OF SOUTH DAKOTA LATE IN THE WEEKEND. .ABR...TOR WATCH #591 NERN SD AND BIG STONE/TRAVERSE COUN TIES IN MN UNTIL 01Z. HINTZ/ECKBERG
In the hours before
Special weather statement, Jul 27, 11:40 AM CDT, 4 hours 4 minutes before
SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ABERDEEN SD 1140 AM CDT TUE JUL 27 1999 .A TROUGH OF LOW PRESSURE IN WESTERN SOUTH DAKOTA WILL MOVE EAST ACROSS THE DAKOTAS THIS AFTERNOON. WARM AND UNSTABLE AIR IS LOCATED AHEAD OF THIS TROUGH IN EASTERN SOUTH DAKOTA. THIS TROUGH WILL INTERACT WITH THIS UNSTABLE AIR...RESULTING IN THUNDERSTORM DEVELOPMENT LATER THIS AFTERNOON AND EVENING...ESPECIALLY ACROSS NORTHEASTERN SOUTH DAKOTA. IT APPEARS THAT THE MAIN THREAT WILL BE LARGE HAIL AND DAMAGING WINDS. SDZ003>005-009-010-015>017-033>037-045-048-051-281800- BUFFALO-CAMPBELL-CORSON-DEWEY-EDMUNDS-FAULK-HAND-HUGHES-HYDE-JONES- LYMAN-MCPHERSON-POTTER-STANLEY-SULLY-WALWORTH- INCLUDING THE CITIES OF EUREKA...FAULKTON...FT PIERRE...FT THOMPSON... GETTYSBURG...HIGHMORE...MCINTOSH...MILLER...MOBRIDGE...MOUND CITY... MURDO...ONIDA...PIERRE...PRESHO...ROSCOE...TIMBER LAKE SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP LATER THIS AFTERNOON. THERE IS A SLIGHT CHANCE THAT SOME OF THE STORMS MAY BECOME SEVERE. SPOTTER ACTIVATION MAY BE REQUIRED AFTER 3 PM CDT. SDZ006>008-011-018>023-MNZ039-046-281800- BIG STONE MN-BROWN-CLARK-CODINGTON-DAY-DEUEL-GRANT-HAMLIN-MARSHALL- ROBERTS-SPINK-TRAVERSE MN- INCLUDING THE CITIES OF ABERDEEN...BRITTON...CASTLEWOOD...CLARK... CLEAR LAKE...MILBANK...ORTONVILLE...REDFIELD...SISSETON...WATERTOWN... WEBSTER...WHEATON THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON. SOME OF THESE STORMSt WILL BECOME SEVERE. SPOTTER ACTIVATION WILL LIKELY BE NEEDED AFTER 3 PM CDT. HINTZ
The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 3:24 PM CDT | Severe Thunderstorm Warning | ABR | Edmunds | 51 min |
| Jul 27, 4:03 PM CDT | Tornado Warning | ABR | Brown | 32 min |
| Jul 27, 4:15 PM CDT | Severe Thunderstorm Warning | ABR | Hyde, Sully | 50 min |
| Jul 27, 4:34 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 46 min |
| Jul 27, 4:48 PM CDT | Severe Thunderstorm Warning | ABR | Marshall | 47 min |
| Jul 27, 4:51 PM CDT | Severe Thunderstorm Warning | ABR | Spink | 64 min |
| Jul 27, 4:58 PM CDT | Severe Thunderstorm Warning | ABR | Faulk | 47 min |
| Jul 27, 5:03 PM CDT | Severe Thunderstorm Warning | ABR | Hand, Hyde | 62 min |
| Jul 27, 5:50 PM CDT | Severe Thunderstorm Warning | ABR | Roberts | 50 min |
| Jul 27, 5:55 PM CDT | Severe Thunderstorm Warning | ABR | Spink | 45 min |
| Jul 27, 6:15 PM CDT | Severe Thunderstorm Warning | ABR | Grant | 50 min |
| Jul 27, 6:23 PM CDT | Severe Thunderstorm Warning | ABR | Clark | 47 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 1999Every severe thunderstorm warning in 1999
Sources
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.