Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 261, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 28, 1999, 2:46 AM CDT for Sargent County, North Dakota. It was in force for 34 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
- Aug 28, 1999, 2:46 AM CDT (07:46 UTC)
- Expired
- Aug 28, 1999, 3:20 AM CDT
- In force
- 34 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Sargent County, ND
The radar
The Aberdeen radar (KABR), 95 km from the middle of the area, began a volume at 07:49 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.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 7.8 hours before the alert went out and 147 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
- 637 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 2503 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 185 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 280746 RRA SVRFAR NDC081-280820- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 246 AM CDT SAT AUG 28 1999 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SARGENT COUNTY IN SOUTHEASTERN NORTH DAKOTA * UNTIL 320 AM CDT * AT 245 AM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 50 MILES WEST OF WAHPETON OR 8 MILES NORTHWEST OF RUTLAND... MOVING EAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RUTLAND AT 316 AM CDT REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED WARNING. KENNEDY J
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 Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 28, 2:25 AM CDT, 21 minutes earlier.
Area forecast discussion, Aug 28, 2:25 AM CDT, 21 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 225 AM CDT SAT AUG 28 1999 .CURRENT SYNOPTIC OVERVIEW... LATEST KMVX RADAR AND IR SATELLITE IMAGERY TRENDS INDICATED 75 MILE WIDE BAND OF THUNDERSTORMS FROM JAMESTOWN TO WAPHETON. STORMS ARE FIRING IN THE VICINITY OF STRONG 85H-7H WARM ADVECTION ZONE WITH INDIVIDUAL CELLS MOVING TO THE SOUTHEAST. 06Z MSAS ANALYSIS DEPICTED STATIONARY FRONT DRAPED ACROSS NORTHERN SOUTH DAKOTA WITH STRONG CANADIAN HIGH PRESSURE POISED OVER NORTHERN SASK PROVINCE. .SHORT TERM... MODELS IN GENERAL AGREEMENT TAKING AFOREMENTIONED BOUNDARY FURTHER SOUTH INTO SOUTH DAKOTA TODAY AS HIGH PRESSURE SURGES SOUTHEAST TO LAKE MANITOBA BY EARLY AFTERNOON. BASED ON LATEST SURFACE OBSERVATIONS AND RADAR TRENDS WILL KEEP LINGERING MORNING POPS ALONG AND SOUTH OF I-94 CORRIDOR. ELSEWHERE WILL HIT MOST WIDESPREAD INSOLATION TODAY IN CLOSE PROXIMITY TO HIGH ACROSS NORTHEAST NODAK/NORTHWEST MINNESOTA WHERE GOOD 85H-5H DRY COLUMN NOTED. CAA ON THE WINGS OF A NORTHEAST TRAJECTORY SHOULD REFLECT IN HIGH TEMPERATURES A GOOD 7 TO 10 DEGREES COOLER THAN YESTERDAY WHICH HAPPENS TO BE INHERITED ZONE PACKAGE THUS...WILL NOT DEVIATE. .LONG TERM... EXPECT AFOREMENTIONED HIGH TO SINK INTO THE UPPER GREAT LAKES BY SUNDAY EVENING WITH MAIN PRECIPITATION BAND SETTING UP TO THE SOUTH AND WEST OF CWFA IN VICINITY OF 5H SHEAR AXIS. WILL INTRODUCE LOW POP THREAT VICINITY OF BUFFER ZONE SUNDAY AFTERNOON ALONG AND WEST OF A DEVILS LAKE TO WAPHETON LINE. .EXTENDED... NO CHANGES PLANNED AT THIS TIME WITH MEDIUM RANGE MODELS STILL IN TRANSIT. .FGF...NONE. BERG
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 12:56 AM CDT | Severe Thunderstorm Warning | FGF | Richland | 34 min |
| Aug 28, 1:49 AM CDT | Severe Thunderstorm Warning | FGF | Ransom | 36 min |
| Aug 28, 3:13 AM CDT | Severe Thunderstorm Warning | FGF | Ransom | 32 min |
Nearby
Severe Thunderstorm Warnings in North 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.