Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 117, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 13, 1997, 4:10 PM CDT for Norman County, Minnesota. It was in force for 35 min. 3 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
- Jul 13, 1997, 4:10 PM CDT (21:10 UTC)
- Expired
- Jul 13, 1997, 4:45 PM CDT
- In force
- 35 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Norman County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 69 km from the middle of the area, began a volume at 21:11 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 |
|---|---|---|---|
| Jul 13, 4:15 PM CDT | Thunderstorm Wind | Ada, MN | Several large trees were uprooted due to the strong wind. |
| Jul 13, 4:15 PM CDT | Thunderstorm Wind | Twin Vly, MN | Large trees were blown over due to the strong wind. |
| Jul 13, 4:18 PM CDT | Hail 0.75 | Twin Vly, 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, 9.2 hours before the alert went out and 273 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
- 303 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 617 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 23 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 132111 RRA SVRFAR MNC107-132145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 410 PM CDT SUN JUL 13 1997 THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 445 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL MINNESOTA ...NORMAN COUNTY AT 408 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM WAS LOCATED AT TWIN VALLEY MINNESOTA OR 35 MILES NORTHEAST OF FARGO. MOVEMENT WAS NORTHEAST AT 20 MPH. THE THUNDERSTORMS WILL REACH WAUKON MINNESOTA AROUND 440 PM CDT. ONE INCH HAIL WAS REPORTED BY LAW ENFORCEMENT IN TWIN VALLEY. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. HOPPES &
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 Jul 13, 3:00 PM CDT, 1 hour 10 minutes earlier.
Area forecast discussion, Jul 13, 3:00 PM CDT, 1 hour 10 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 300 PM CDT SUN JUL 13 1997 FIRST PERIOD DISCUSSION...88D SHOWING HEALTHY STRMS FM NEAR MAYVILLE TO WAHPETON ND. MVMNT NE AT 25 MPH. GRIDDED DATA HAS JET STREAK INTO CNTRL ND FCST TO SHFT E INTO ERN ND BY 00Z. APPARENTLY CU FIELD SUPPRESSED W OF TSRA LINE INTO CNTRL ND. ATMOS QUITE UNSTABLE WL LIKELY NEED HI VILS TO GET HAIL. WATER VAPOR IMAGERY SHOWING SOME DRIER MID LVL AIR TRYING TO MOV INTO ERN ND...MAY GIVE STRMS MORE POTENTIAL FOR PRODUCING STRNG WNDS. WATER VAPOR ALSO SHOWS VORT MAX ALNG WRN BD BRDR AND PSBLY ANOTHER VORT MAX IN CNTRL SD. MOS TEMPS REASONABLE FOR OVRNT LOWS...SHUD SEE MID 60S MOST PLACES. HOPPES
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 4:26 PM CDT | Severe Thunderstorm Warning | FGF | Mahnomen | 34 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.