Alert archive / North Dakota / Tornado Warnings in 1999

Tornado Warning 44, NWS Grand Forks, ND

August 15, 1999Ransom County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 15, 1999, 9:40 PM CDT for Ransom County, North Dakota. It was in force for 35 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 15, 1999, 9:40 PM CDT (02:40 UTC)
Expired
Aug 15, 1999, 10:15 PM CDT
In force
35 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Ransom County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 122 km from the middle of the area, began a volume at 02:40 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, 2.7 hours before the alert went out and 182 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 1999-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1506 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 1999-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.1939587897117Sfc1 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
1506 J/kg
Mixed-layer CIN
-180 J/kg
Mixed-layer LCL
1978 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
259 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFAR 160241 RRA
TORFAR
NDC073-160315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
940 PM CDT SUN AUG 15 1999

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN RANSOM COUNTY IN SOUTHEASTERN NORTH DAKOTA

* UNTIL 1015 PM CDT

* AT 939 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A TORNADO 32 MILES SOUTHEAST OF VALLEY CITY OR 8 MILES WEST OF
  ANSELM... MOVING EAST AT 30 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  SHELDON AT 955 PM CDT
  ANSELM AT 956 PM CDT

IF A BASEMENT IS NOT AVAILABLE THEN SEEK SHELTER IN AN INNERMOST
ROOM...SUCH AS A CLOSET...ON THE LOWEST FLOOR. AVOID WINDOWS ANDP
PROTECT YOURSELF WITH BLANKETS...PILLOWS...OR CUSHIONS.

BRAZZELL

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 Grand Forks, ND wrote its last area forecast discussion before this tornado warning went out at Aug 15, 9:00 PM CDT, 40 minutes earlier.

Area forecast discussion, Aug 15, 9:00 PM CDT, 40 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
900 PM CDT SUN AUG 15 1999

UPR LVL TROF AXIS OVR ERN MT INTO SRN AB ROTATING TO A NEG TILT. H5
UPR AIR SHOWING GOOD RISE FALL COUPLET WITH MT TROF. DRY SLOT RUNS
FM SRN CA INTO CNTRL ND. VORT MAX OVR NE MT AND ANOTHER OVR SRN AB
WITH ETA WITH A REASONABLE SOLUTION.  WATER VAPOR LOOP SHOWS SOME
RIDGE BUILDING ACRS THE THE FAR SRN CWFA HOWEVER ROTATING NEG TILT
TROF IS KNOCKING RIDGE DOWN. ETA H7 TEMPS FCST TO FALL ACRS THE CWFA
AND RELEASE THE CAP. MUCH DRIER AIR TO MOV IN AOA 600 HPA ALONG WITH
INCRG H7 WIND SPEED WL MAKE FOR POTENTIAL FOR WND DAMAGE AND FAST
MOVG STORMS. ADAP HAS MOST UNSTABLE AIR AND WEAKEST CAP OVR NE SD
AND EXTENDS N WHERE 88D HAS CURRENT LINE OF STORMS. ALSO SFC MSTR
FLUX CONVERGENCE ORIENTATED N-S WITH TSRA. PRES RISES AND MORE
STABLE AIR WERE MOVG INTO WRN ND. WL CONT TREND OF TSRA MOVG E ACRS
CWFA. WL UPDATE ZONES.

.FGF...SVR THUNDERSTORM WATCH 642 IN EFFECT UNTIL 11 PM CDT FOR ALL
ERN ND COUNTIES XCP RANSOM, SARGENT, AND RICHLAND.
HOPPES

In the hours before

Local storm report, Aug 15, 4:17 PM CDT, 5 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
417 PM CDT SUN AUG 15 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1110 AM    11 NE GRAFTON             ND   .75 INCH HAIL
08/15/99   WALSH                          DIME SIZE HAIL
Local storm report, Aug 15, 5:16 PM CDT, 4 hours 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
516 PM CDT SUN AUG 15 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0230 PM    WASKISH                   MN   1.75 INCH HAIL
08/15/99   BELTRAMI                       4E WASKISH GOLFBALL SIZE
                                          HAIL
Local storm report, Aug 15, 9:06 PM CDT, 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
906 PM CDT SUN AUG 15 1999...CORRECTION FOR COUNTY

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0855 PM    7 W LITCHVILLE            ND   TORNADO
08/15/99   BARNES                         BRIEF TOUCHDOWN IN FIELD

0903 PM    LITCHVILLE                ND   .75 INCH HAIL
08/15/99   BARNES
Local storm report, Aug 15, 9:06 PM CDT, 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
906 PM CDT SUN AUG 15 1999...CORRECTION FOR COUNTY

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0855 PM    7 W LITCHVILLE            ND   TORNADO
08/15/99   BARNES                         BRIEF TOUCHDOWN IN FIELD

0903 PM    LITCHVILLE                ND   .75 INCH HAIL
08/15/99   BARNES

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 15, 7:22 PM CDTSevere Thunderstorm WarningFGFBenson48 min
Aug 15, 8:10 PM CDTSevere Thunderstorm WarningFGFEddy35 min
Aug 15, 8:41 PM CDTTornado WarningFGFBarnes49 min
Aug 15, 9:11 PM CDTTornado WarningFGFBarnes, Ransom49 min

Nearby

Tornado Warnings in North 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.