Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 261, NWS Grand Forks, ND

August 28, 1999Sargent County, North Dakota

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.

Skew-T log-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 1999-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 637 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 1999-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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.

IssuedProductOfficeCountiesLasted
Aug 28, 12:56 AM CDTSevere Thunderstorm WarningFGFRichland34 min
Aug 28, 1:49 AM CDTSevere Thunderstorm WarningFGFRansom36 min
Aug 28, 3:13 AM CDTSevere Thunderstorm WarningFGFRansom32 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.