Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 209, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 7, 1997, 10:00 PM CDT for Polk County, Minnesota. It was in force for 30 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
- Sep 7, 1997, 10:00 PM CDT (03:00 UTC)
- Expired
- Sep 7, 1997, 10:30 PM CDT
- In force
- 30 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Polk County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 74 km from the middle of the area, began a volume at 02:59 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
International Fa, MN (KINL), launched 00:00Z, 3.0 hours before the alert went out and 246 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 709 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 220 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 080301 RRA SVRFAR MNC119-080330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 1000 PM CDT SUN SEP 7 1997 THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHWEST MINNESOTA ...WESTERN POLK COUNTY AT 959 PM...RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTHEAS T OF CROOKSTON OR 25 MILES SOUTHEAST OF GRAND FORKS MOVING SOUTHEAST AT 20 MPH. THIS STORM WILL EFFECT THE TOWN OF HAROLD. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. 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, 58 minutes earlier.
Area forecast discussion, Sep 7, 9:02 PM CDT, 58 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
In the hours before
Local storm report, Sep 7, 9:55 PM CDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED TIME IN LAST ENTRY
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
955 PM CDT SUN SEP 7 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0619 PM 7 S HAMAR ND 0.75 INCH HAIL
09/07/97 EDDY
0815 PM 3.5 NE ARDOCH ND 1.75 INCH HAIL
09/07/97 WALSH
0925 PM THOMPSON ND 0.75 INCH HAIL
09/07/97 GRAND FORKS
BELLESLocal storm report, Sep 7, 9:56 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED TIME IN LAST ENTRY
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
955 PM CDT SUN SEP 7 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0619 PM 7 S HAMAR ND 0.75 INCH HAIL
09/07/97 EDDY
0815 PM 3.5 NE ARDOCH ND 1.75 INCH HAIL
09/07/97 WALSH
0925 PM THOMPSON ND 0.75 INCH HAIL
09/
07/97 GRAND FORKS
BELLESThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 7:06 PM CDT | Severe Thunderstorm Warning | FGF | Roseau | 39 min |
| Sep 7, 7:34 PM CDT | Severe Thunderstorm Warning | FGF | Kittson | 26 min |
| Sep 7, 7:44 PM CDT | Severe Thunderstorm Warning | FGF | Roseau | 31 min |
| Sep 7, 8:32 PM CDT | Severe Thunderstorm Warning | FGF | Marshall | 28 min |
| Sep 7, 9:03 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Polk | 27 min |
| Sep 7, 9:29 PM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk | 31 min |
| Sep 7, 10:31 PM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk | 29 min |
| Sep 7, 11:37 PM CDT | Severe Thunderstorm Warning | FGF | Clay | 38 min |
| Sep 7, 11:50 PM CDT | Severe Thunderstorm Warning | FGF | Clay | 40 min |
| Sep 8, 12:30 AM CDT | Severe Thunderstorm Warning | FGF | Clay | 30 min |
| Sep 8, 12:40 AM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 35 min |
| Sep 8, 4:22 PM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 38 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.