Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 387, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 6, 2001, 7:41 PM CDT for Ransom County, Sargent County, North Dakota. It was in force for 49 min. 3 reports 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 6, 2001, 7:41 PM CDT (00:41 UTC)
- Expired
- Sep 6, 2001, 8:30 PM CDT
- In force
- 49 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Ransom County, ND, Sargent County, ND
The radar
The Aberdeen radar (KABR), 100 km from the middle of the area, began a volume at 00:44 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 6, 7:45 PM CDT | Hail 0.75 | Englevale, ND | |
| Sep 6, 7:50 PM CDT | Hail 0.75 | Gwinner, ND | |
| Sep 6, 8:25 PM CDT | Thunderstorm Wind | Milnor, ND | Several large trees were blown over in Milnor. One tree fell on top of 2 parked vehicles. |
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 00:00Z, 0.7 hours before the alert went out and 158 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
- 1807 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 1456 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 5.4
The text
As transmitted, in the capitals the NWS used until 2016.
846 WUUS53 KFGF 070041 SVRFAR NDC073-081-070130- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS 741 PM CDT THU SEP 6 2001 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHWESTERN RANSOM COUNTY IN SOUTHEAST NORTH DAKOTA AND SARGENT COUNTY IN SOUTHEAST NORTH DAKOTA. * UNTIL 830 PM CDT. * AT 736 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 8 MILES NORTHWEST OF CRETE...OR ABOUT 44 MILES SOUTH OF VALLEY CITY...MOVEMENT WAS TO THE EAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... CRETE AT 745 PM... STIRUM AT 805 PM... GWINNER AT 820 PM AND FORMAN AT 825 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM THURSDAY EVENING FOR NORTHWESTERN MINNESOTA AND SOUTHEAST NORTH DAKOTA. LAT...LON 4639 9810 4622 9817 4605 9746 4628 9736 $$ 08 DJK 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 6, 5:30 PM CDT, 2 hours 11 minutes earlier.
Area forecast discussion, Sep 6, 5:30 PM CDT, 2 hours 11 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 530 PM CDT THU SEP 6 2001 ...WILL BE BRIEF WITH SEVERE WEATHER ONGOING... SENT OUT A FLASH FLOOD WATCH FOR AREAS ALONG AND IMMEDIATELY EAST OF THE SLOW MOVING COLD FRONT. INTENSE MOISTURE FLUX CONVERGENCE ALONG FRONT...COUPLED WITH PRECIPITABLE WATERS TO 1.75 INCHES AND APPROACHING SHORTWAVE SPELL CONTINUATION OF TRAINING THUNDERSTORMS. NEW RUC ALSO IS PICKING UP ON SLOW MOVING FRONT...WITH 850 JET CONTINUING TO FEED INTO AREA ALONG FRONT. .FGF...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST ND AND PORTIONS OF WEST CENTRAL AND NORTHWEST MINNESOTA...FLASH FLOOD WATCH ALONG AND 60 MILES EAST OF A VALLEY CITY TO HILLSBORO TO WARROD LINE. KELLENBENZ
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 7:17 PM CDT | Flash Flood Warning | FGF | Cass | 6 hr |
| Sep 6, 9:42 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 48 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 2001Every severe thunderstorm warning in 2001
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.