Alert archive / South Dakota / Tornado Warnings in 1999
Tornado Warning 22, NWS Aberdeen, SD
NWS Aberdeen, SD issued this tornado warning at Jul 30, 1999, 1:55 PM CDT for Hamlin County, South Dakota. It was in force for 35 min. 4 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 30, 1999, 1:55 PM CDT (18:55 UTC)
- Expired
- Jul 30, 1999, 2:30 PM CDT
- In force
- 35 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Hamlin County, SD
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 30, 2:10 PM CDT | Hail 2.75 | Hayti, SD | |
| Jul 30, 2:10 PM CDT | Hail 0.75 | Bryant, SD | |
| Jul 30, 2:15 PM CDT | Hail 2.75 | Thomas, SD | |
| Jul 30, 2:26 PM CDT | Hail 1 | Castlewood, 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, 6.9 hours before the alert went out and 99 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
- 868 J/kg
- Mixed-layer CIN
- -237 J/kg
- Mixed-layer LCL
- 2579 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KABR 301856 TORABR SDC057-301930- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ABERDEEN SD 155 PM CDT FRI JUL 30 1999 THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A * TORNADO WARNING FOR... NORTHERN HAMLIN COUNTY IN NORTHEASTERN SOUTH DAKOTA * UNTIL 230 PM CDT * AT 154 PM CDT... ABERDEEN DOPPLER RADAR INDICATED A TORNADO 13 MILES SOUTH OF WATERTOWN OR 2 MILES SOUTH OF THOMAS MOVING SOUTHEAST AT 10 MPH. * THE VTORNADO WILL BE NEAR... THOMAS AT 200 PM CDT HAYTI AT 215 PM CDT GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR! DH/RE
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Jul 30, 10:37 AM CDT, 3 hours 18 minutes earlier.
Area forecast discussion, Jul 30, 10:37 AM CDT, 3 hours 18 minutes before
AREA FORECAST DISCUSSION FOR CENTRAL/NORTHCENTRAL AND NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA NATIONAL WEATHER SERVICE ABERDEEN SD 1030 AM CDT FRI JULY 30 1999 CONVECTION STARTING ALONG SURFACE FRONT. LATEST 88D PICTURE SHOWS FRONT MOVING THROUGH ABERDEEN. ABERDEEN LOST 4 DEGREES AS FRONT PUSHED THROUGH SO SHOULD END CONCERNS ABOUT HEAT ADVISORY. WILL UPDATE PACKAGE TO INCREASE CHANCE OF THUNDERSTORM AND LOWER EXPECTED HIGHS. v .ABR...NONE. KEEFE
In the hours before
Special weather statement, Jul 30, 10:55 AM CDT, 3 hours before
SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ABERDEEN SD 1055 AM CDT FRI JUL 30 1999 .A SURFACE LOW AND COLD FRONT IS MOVING THROUGH THE CENTRAL AND WEST PARTS OF THE AREA. CONVECTION IS STARTING ALONG THE FRONT. THESE STORMS ARE NOT EXPECTED TO BECOME SEVERE IN THE WEST AND CENTRAL BUT THERE IS A SLIGHT CHANCE OF STORMS BECOMING SEVERE IN THE EAST PART OF THE ABERDEEN WARNING AREA. SDZ007-008-011-020-021-023-MNZ039-046-311600- BIG STONE MN-CODINGTON-DAY-DEUEL-GRANT-MARSHALL-ROBERTS-TRAVERSE MN- INCLUDING THE CITIES OF BRITTON...CLEAR LAKE...MILBANK...ORTONVILLE... SISSETON...WATERTOWN...WEBSTER...WHEATON THUNDERSTORMS WILL LIKELY MOVE THROUGH THE AREA THIS AFTERNOON. THERE IS A SLIGHT CHANCE THESE STORMS MAY BECOME SEVERE. SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON. SDZ003>006-009-010-015>019-022-033>037-045-048-051-311600- BROWN-BUFFALO-CAMPBELL-CLARK-CORSON-DEWEY-EDMUNDS-FAULK-HAMLIN-HAND- HUGHES-HYDE-JONES-LYMAN-MCPHERSON-POTTER-SPINK-STANLEY-SULLY- WALWORTH- INCLUDING THE CITIES OF ABERDEEN...CASTLEWOOD...CLARK...EUREKA... FAULKTON...FT PIERRE...FT THOMPSON...GETTYSBURG...HIGHMORE... MCINTOSH...MILLER...MOBRIDGE...MOUND CITY...MURDO...ONIDA...PIERRE... PRESHO...REDFIELD...ROSCOE...TIMBER LAKE THUNDERSTORMS ARE OCCURING. THEY ARE NOT EXPECTED TO BECOME SEVERE. SPOTTER ACTIVATION IS NOT ANTICIPATED. KEEFE
The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 7:11 PM CDT | Severe Thunderstorm Warning | ABR | Stanley | 29 min |
| Jul 29, 7:16 PM CDT | Flash Flood Warning | ABR | Stanley | 3 hr |
| Jul 29, 7:39 PM CDT | Severe Thunderstorm Warning | ABR | Lyman | 46 min |
| Jul 30, 1:35 PM CDT | Severe Thunderstorm Warning | ABR | Codington | 50 min |
| Jul 30, 1:47 PM CDT | Severe Thunderstorm Warning | ABR | Hamlin | 63 min |
| Jul 30, 1:58 PM CDT | Severe Thunderstorm Warning | ABR | Clark | 47 min |
| Jul 30, 2:08 PM CDT | Severe Thunderstorm Warning | ABR | Deuel | 47 min |
| Jul 30, 2:18 PM CDT | Severe Thunderstorm Warning | ABR | Hamlin | 47 min |
| Jul 30, 2:23 PM CDT | Severe Thunderstorm Warning | ABR | Codington | 62 min |
Nearby
Tornado Warnings in South Dakota, 1999Every tornado warning in 1999Tornadoes 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.