Alert archive / North Dakota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 207, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 7, 1997, 9:07 PM CDT for Grand Forks County, North Dakota. It was in force for 38 min. 1 report 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 7, 1997, 9:07 PM CDT (02:07 UTC)
- Expired
- Sep 7, 1997, 9:45 PM CDT
- In force
- 38 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Grand Forks County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 45 km from the middle of the area, began a volume at 02:09 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 7, 9:25 PM CDT | Hail 0.75 | Thompson, 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 2.1 hours before the alert went out and 276 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
- 54 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 2572 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 080209 RRA SVRFAR NDC035-080245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 907 PM CDT SUN SEP 7 1997 THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 945 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHEAST NORTH DAKOTA ...EASTERN GRAND FORKS COUNTY AT 906 PM...RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES WEST OF THOMPSON OR 17 MILES SOUTHWEST OF GRAND FORKS. THIS STROM IS MOVING TO THE EAST AT 15 MPH AND WILL EFFECT THE CITY OF THOMPSON. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNIN8G. GSF
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 7, 9:02 PM CDT, 5 minutes earlier.
Area forecast discussion, Sep 7, 9:02 PM CDT, 5 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 901 PM CDT SUN SEP 7 1997 FIRST PERIOD DISCUSSION...GENERAL TREND ON STRMS ON 88D HAS BEEN ON THE DCRS ESPECIALLY IN ERN ND. HOWEVER IR IMAGERY HAS SOME BUILDING TO THE SW. 88D VAD WND HAS RELATIVELY WK WNDS ALFT MAKING FOR PULSE STORMS. LOW LVL FLO ON VAD WND HAS INCRSD A BIT IN LAST HALF HOUR. ADAP CONTS TO SHOW SFC MOIST CNVG IN NRN CNTYS BUT LESS THAN EARLIER PLOTS. BEST INSTABLILITES REMAIN AHEAD OF CD FNT. WITH SFC HTG GONE XPCT STRMS TO CONT TO DROP BLO SVR LVLS. HOWEVER LLJ MAY KEEP THINGS ALIVE FOR A WHILE. HOPPES
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 7:15 PM CDT | Severe Thunderstorm Warning | FGF | Walsh | 30 min |
| Sep 7, 7:47 PM CDT | Severe Thunderstorm Warning | FGF | Griggs | 28 min |
| Sep 7, 8:13 PM CDT | Severe Thunderstorm Warning | FGF | Walsh | 17 min |
| Sep 7, 11:37 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 38 min |
| Sep 7, 11:50 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 40 min |
| Sep 8, 12:30 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 30 min |
| Sep 8, 12:40 AM CDT | Severe Thunderstorm Warning | FGF | Richland | 35 min |
| Sep 8, 4:22 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 38 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1997Every severe thunderstorm warning in 1997
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.