Alert archive / North Dakota / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 250, NWS Grand Forks, ND

September 2, 2000Cass County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 2, 2000, 11:56 AM CDT for Cass County, North Dakota. It was in force for 34 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Sep 2, 2000, 11:56 AM CDT (16:56 UTC)
Expired: Sep 2, 2000, 12:30 PM CDT
In force: 34 min
Issued by: NWS Grand Forks, ND
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 72 km from the middle of the area, began a volume at 16:56 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
Sep 2, 12:05 PM CDT	Hail 0.88	Embden, ND

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, 4.9 hours before the alert went out and 235 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 516 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFGF 021657
SVRFAR
NDC017-021730-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
1156 AM CDT SAT SEP 2 2000

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CASS COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 1230 PM CDT

* AT 1150 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES WEST OF EMBDEN...OR ABOUT 26 MILES EAST
  OF VALLEY CITY...MOVEMENT WAS TO THE NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WHEATLAND AT 1205 PM CDT...
  CASSELTON AT 1210 PM CDT...
  MAPLETON AT 1215 PM CDT...

* THIS STORM HAS A HISTORY OF PRODUCING ONE INCH HAIL

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

LAT...LON 4687 9760 4672 9745 4689 9702 4707 9718

NNNN

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 Sep 2, 10:05 AM CDT, 1 hour 51 minutes earlier.

Area forecast discussion, Sep 2, 10:05 AM CDT, 1 hour 51 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1005 AM CDT SAT SEP 2 2000

FORECAST PROBLEM FOR TODAY IS PCPN. LATEST VIS AND IR SATELLITE
IMAGERY SHOWS CWFA COVERED IN IFR DECK WITH COLDEST CLOUD TOPS
WORKING INTO E ND. LATEST MSAS SFC PRESSURE ANALYSIS HAS LOW
PRESSURE CENTERED IN SE MT WITH TROF EXTENDING THROUGH W SD TO
ANOTHER LOW IN CENTRAL NE. CWFA IS IN MOIST E-SE FLOW. 12Z 850MB UA
MAP SHOWS WARM FRONT EXTENDING THROUGH SE ND INTO WC MN...
COINCIDENTAL TO WHERE CURRENTLY HAVE STRONGEST CONVECTION. WITH REST
OF CWFA GETTING GENERAL SHRA/TSRA DUE TO WAA. WHEN COMPARING MSAS
PRESSURE ANALYSIS TO MODELS...ETA MATCHES BEST WITH AVN ALSO CLOSE.
MODELS KEEP PCPN OVER CWFA AS SHORTWAVE MOVES THROUGH...WITH BEST
POTENTIAL FOR STRONGER STORMS STILL IN S CWFA. ALL IN ALL...CURRENT
FORECAST HANDLING SITUATION WELL...WITH ONLY MINOR CHANGES NEEvDED.

.FGF...NONE

NG

In the hours before

Special weather statement, Sep 2, 6:40 AM CDT, 5 hours 16 minutes before

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-021400-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
640 AM CDT SAT SEP 2 2000

...SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING...

SYNOPSIS...LOW PRESSURE IN MONTANA WILL MOVE SOUTHEAST INTO CENTRAL
SOUTH DAKOTA THIS AFTERNOON AND INTO SOUTHERN MINNESOTA TONIGHT.
WARM AND MOIST AIR WILL MOVE NORTH INTO EASTERN NORTH DAKOTA AND
NORTHWEST MINNESOTA TODAY AND TONIGHT.  SHOWERS AND THUNDERSTORMS
WILL GRADUALLY OVERSPREAD EASTERN NORTH DAKOTA TODAY AND REACH
NORTHWEST MINNESOTA LATER TODAY AND EVENING.

AREA OF CONCERN...THERE IS A RISK OF SEVERE WEATHER THIS AFTERNOON
AND EVENING OVER SOUTHEAST NORTH DAKOTA AND WEST CENTRAL MINNESOTA..
.MAINLY SOUTH OF A VALLEY CITY TO FARGO TO PARK RAPIDS LINE.

SCATTERED THUNDERSTORMS WILL OCCUR OVER THE REMAINDER OF THE
REGION... WITH HEAVY RAIN AND SMALL HAIL POSSIBLE OVER NORTHEAST
NORTH DAKOTA INTO NORTHWEST MINNESOTA.

TIME...SEVERE THREAT IS BETWEEN 2 PM AND MIDNIGHT.

TYPE OF HAZARD...MAINLY LARGE HAIL.

RIDDLE

NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 2, 11:29 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	31 min
Sep 2, 12:21 PM CDT	Severe Thunderstorm Warning	FGF	Ransom	29 min
Sep 2, 12:43 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass	32 min
Sep 2, 1:40 PM CDT	Severe Thunderstorm Warning	FGF	Ransom	30 min
Sep 2, 1:45 PM CDT	Severe Thunderstorm Warning	FGF	Sargent	30 min
Sep 2, 2:18 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland	32 min
Sep 2, 2:43 PM CDT	Severe Thunderstorm Warning	FGF	Cass	32 min
Sep 2, 3:28 PM CDT	Severe Thunderstorm Warning	FGF	Ransom	32 min
Sep 2, 3:33 PM CDT	Severe Thunderstorm Warning	FGF	Sargent	32 min
Sep 2, 3:58 PM CDT	Severe Thunderstorm Warning	FGF	Ransom	32 min
Sep 2, 4:32 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland	28 min
Sep 2, 4:44 PM CDT	Flash Flood Warning	FGF	Cass, Ransom, Richland	4 hr

Nearby

Severe Thunderstorm Warnings in North Dakota, 2000 Every severe thunderstorm warning in 2000

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.