Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 380, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 6, 2001, 3:25 PM CDT for Marshall County, Pennington County, Minnesota. It was in force for 35 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 6, 2001, 3:25 PM CDT (20:25 UTC)
- Expired
- Sep 6, 2001, 4:00 PM CDT
- In force
- 35 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Marshall County, MN, Pennington County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 113 km from the middle of the area, began a volume at 20:28 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, 3:30 PM CDT | Hail 0.75 | Thief River Falls, MN | |
| Sep 6, 3:35 PM CDT | Hail 1 | Viking, MN |
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
International Fa, MN (KINL), launched 12:00Z, 8.4 hours before the alert went out and 218 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
- 668 J/kg
- Mixed-layer CIN
- -275 J/kg
- Mixed-layer LCL
- 923 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 10:30 AM CDT, 4 hours 55 minutes earlier.
Area forecast discussion, Sep 6, 10:30 AM CDT, 4 hours 55 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 1030 AM CDT THU SEP 6 2001 VAD WND HAS BACKING FLOW ACRS WRN ND. BACKING FLOW WAS BLO 6 THSD FEET AT BIS AND BLO 10 THSD FEET AT KMBX. VEERING WND INDICATED AT KMVX AND ABR. ETA MODEL SOUNDING SHOWS LWR ATMOSPHERE COOLS BLO 500 HPA TDY. CAPES FCST TO BE ARND 1000-1500 J/KG TDY. CINS INCR A BIT DURING THE DAY TO ARND 50 J/KG BY LATE AFTN. CONVECTIVE TEMPS START HI THIS MORN AND FALL TO ARND 80 DEGREES BY LATE AFTN. 850 HPA TROF OVR ND WL MOV INTO ERN ND THIS AFTN. MESOSCALE ANLYS SHOWS A PRES RISE CNTR OVR SW MAN MOVG NE. SFC WNDS HAVE BECM NW AT DVL. WL KEEP CHC OF TSRA IN FCST. WL CHECK ZONES. .FGF...NONE. HOPPES
In the hours before
Special weather statement, Sep 6, 1:15 PM CDT, 2 hours 10 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052>054-062000- SPECIAL WEATHER STATEMENT HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 115 PM CDT THU SEP 6 2001 ...THERE IS A RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF SOUTHEAST NORTH DAKOTA AND WESTERN MINNESOTA LATE THIS AFTERNOON AND EVENING... SYNOPSIS...A SLOW MOVING COLD FRONT WILL ENCOUNTER A MOIST AND MODERATELY UNSTABLE AIRMASS AS IS ADVANCES INTO EASTERN NORTH THIS AFTERNOON...AND INTO WESTERN MINNESOTA EARLY THIS EVENING. TEMPERATURES WILL WARM INTO THE 80S THROUGH THE AFTERNOON...AND WHEN COMBINED WITH DEWPOINTS IN THE MIDDLE TO UPPER 60S...INSTABILITY WILL BE MAXIMIZED ACROSS THE SOUTHERN HALF OF THE RED RIVER VALLEY. AREA OF CONCERN...A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS EAST OF A HALLOCK TO COOPERSTOWN AND ELLENDALE LINE. TIME...START AFTER 300 PM AND DIMINISH AFTER 900 PM. TYPE OF HAZARD...MAINLY LARGE HAIL. DAMAGING WINDS WILL BE A THREAT...AS WILL LOCALLY FLOODING RAINS FROM SLOW MOVING OR REPEAT THUNDERSTORM EVENTS. GUST
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 4:18 PM CDT | Severe Thunderstorm Warning | FGF | Polk, Red Lake | 42 min |
| Sep 6, 5:01 PM CDT | Severe Thunderstorm Warning | FGF | Polk, Red Lake | 59 min |
| Sep 6, 4:30 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 30 min |
| Sep 6, 5:15 PM CDT | Flash Flood Warning | FGF | Barnes | 6 hr |
| Sep 6, 5:18 PM CDT | Severe Thunderstorm Warning | FGF | Barnes | 42 min |
| Sep 6, 5:45 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 45 min |
| Sep 6, 6:17 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 28 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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.