Alert archive / North Dakota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 216, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 12, 1997, 5:20 AM CDT for Sargent County, North Dakota. It was in force for 25 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 12, 1997, 5:20 AM CDT (10:20 UTC)
- Expired
- Sep 12, 1997, 5:45 AM CDT
- In force
- 25 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Sargent County, ND
The radar
The Aberdeen radar (KABR), 95 km from the middle of the area, began a volume at 10:21 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
Aberdeen, SD (KABR), launched 00:00Z, 10.3 hours before the alert went out and 147 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
- 1398 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 238 m²/s²
- 0-3 km storm-relative helicity
- 385 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 121019 RRA SVRFAR NDC081-121045- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 520 AM CDT FRI SEP 12 1997 THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 545 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST NORTH DAKOTA ...NORTHERN SARGENT COUNTY AT 518 AM...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR COGSWELL...OR 50 MILES SOUTH OF VALLEY CITY. THIS STORM WAS MOVING NORTHEAST AT 25 MPH AND WILL AFFECT FORMAN AND GWINNER. WHEN THUNDERSTORMS ARE OCCURRING...MOVE INTO A STRONG BUILDING. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES AND SfTAY AWAY FROM WINDOWS.
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 12, 3:51 AM CDT, 1 hour 29 minutes earlier.
Area forecast discussion, Sep 12, 3:51 AM CDT, 1 hour 29 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 250 AM CDT FRI SEP 13 1997 PROB TDY WILL BE CHANCE FOR SEVERE TSRA WITH APPROACHING FRONT AND TEMPS. TSRA DEVELOPED OVERNIGHT AHEAD OF WARMFRONT IN STRONG H8 WAA AND TEMP GRADIENT. ETA WAS BEST AT PICKING UP ON THIS FEATURE. 30-40 LLJET EVIDENT FROM KMVX VAD WINDS SHOULD KEEP TSRA GOING DURING MORNING HOURS MAINLY OVR E ND AS WAA SHIFTS N EVEN WITH LIMITED MOIST AND INSTABILITY. LATER THIS AFTERNOON MORE TSRA A GOOD BET AS SHORTWAVE MOVING INTO CENTRAL ROCKIES FROM WV LOOP INTERACTS WITH SFC BOUNDARY PROGGED OVR CENT DAKOTAS AT 00Z. QUESTION WILL BE SEVERE POTENTIAL. STRONG 40 TO 50KT LLJ PROGGED TO CONTINUE ALL DAY ADVECTING MOIST NORTHWARD. MODELS HOWEVER KEEP DEWPOINTS BLO 60 THIS AFTERNOON. ALSO CLD COVER COULD INHIBIT SFC HEATING RESULTING IN MARGINAL INSTABILITY AND CAPE. ATTM WILL NOT MENTION SEVERE HOWEVER SIT WILL HAVE TO MONITORED. SEVERE POTENTIAL WILL INCREASE IF MORE SOLAR OCCURS AND TD'S INCREASE GREATER THAN MODELS INDICATE. MODIFIED MODEL SOUNDING FOR TEMP/TD AT FAR YIELD LI OF -4 AND CAPE APPROACHING 1200. OTWS CLDS WILL INCREASE ACROSS EXT N MN WITH PC TO MOCLDY SKIES ELSEWHERE. TEMPS WILL BE TRICKY GOVERNED BY CLD COVER. WITH WARM START AND PARTIAL SUN ALONG WITH GOOD WAA AND MIXING TEMPS COULD APPROACH MOS VALUES. ATTM PLENTY OF CLD COVER UPSTREAM SO PSBLY SHAVE TEMPS A LITTLE DOWNWARD FROM MOS. FOR DVL...MOCLDY WITH ISOLD -TSRA AM AND GOOD CHC FOR MORE TSRA THIS AFTERNOON. HIGH MID 70S. SE 15 TO 25 MPH. GFK...WDLY SCATTERED AM TSRA AND GOOD CHANCE FOR MORE TSRA LATER THIS AFTERNOON. HIGH 75 TO 80. SE 15 TO 25. FAR...WDLY SCATTERED AM TSRA AND GOOD CHANCE FOR MORE TSRA LATER THIS AFTERNOON. HIGH 75 TO 80. SE 15 TO 25. ROX/BDE/BJI...INC CLDS WITH WDLY SCT SHRA ISOLD TSRA DEVELOPING AROUND MID AM. HIGH MID 70S SE 15 TO 25. TVF/DTL/FFM...MOCLDY WITH WDLY SCT SHRA ISOLD TSRA AM...CHC OF LATE PM TSRA. HIGH MID TO UPPER 70S. SE 15 TO 25 MPH VOELKER
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.