Alert archive / North Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 139, NWS Grand Forks, ND

July 25, 1997Sargent County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 25, 1997, 7:30 PM CDT for Sargent County, North Dakota. It was in force for 15 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: Jul 25, 1997, 7:30 PM CDT (00:30 UTC)
Expired: Jul 25, 1997, 7:45 PM CDT
In force: 15 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 00:34 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 25, 7:38 PM CDT	Thunderstorm Wind	Havana, ND	A grain bin was damaged in the strong wind.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 25, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.5 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3331 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFAR 260029 RRA
SVRFAR
NDC081-260045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
730 PM CDT FRI JUL 25 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  745 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST NORTH DAKOTA
 
   ...SOUTHERN SARGENT COUNTY
 
AT 727 PM RADAR INDICATED AS LINE OF SEVERE THUNDERSTORMS FROM 12 MILES
SOUTHEAST OF FORMAN TO 5 MILES EAST OF HAVANA NORTH DAKOTA OR 40 TO 55
MILES WEST-SOUTHWEST OF WAHPETON. THIS LINE OF STORMS WAS MOVING
SOUTHEAST AT 20 MILES AN HOUR. CAMPERS AROUND THE LAKE TEWAUKON AREA
SHOULD SEEK PERMANENT SHELTER.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND OVER 57 MPH...HAIL
3/4 INCH IN DIAMETER OR LARGER...TORNADOES...DEADLY
LIGHTNING...AND VERY HEAVY RAIN.  MOVE TO A SMALL INTERIOR
ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.
EWENS

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 25, 2:56 PM CDT, 4 hours 34 minutes earlier.

Area forecast discussion, Jul 25, 2:56 PM CDT, 4 hours 34 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
255 PM CDT FRI JUL 25 1997

PROBLEM FOR FIRST PERIOD IS PCPN. TSRA ALREADY IN WESTERN PART OF CWFA
MOVINMG NE WITH KMVX 88D ESTIMATING 1.4 INCHES IN SOUTHERN BENSON
COUNTY. 18Z SFC ANALYSIS HAS STATIONARY FRONT SLIGHTLY FURTHER EAST
WITH NUMEROUS LEFTOVER BOUNDARIES. NGM CONTINUES TO HAVE THE BEST
HANDLE ON SITUATION WITH UPPER LEVEL DIVERGENCE AND NE-SW ORIENTED
THETA-E RIDGE. LOOKS LIKE BEST CHANCE FOR SEVERE WEATHER IS IN THE DVL
AREA. THE POTENTIAL FOR HEAVY RAIN IS ALSO A GOOD POSSIBILITY. FLASH
FLOOD GUIDANCE IN DVL AREA RANGES FROM 1 INCH TO UNDER 2 INCHES IN THREE
HOURS. SUGGEST STRONGLY CONSIDER FLASH FLOOD WATCH FOR DVL AREA.

SUGGESTIONS:
DVL/NELSON/GRIGGS/BARNES...GOOD CHANCE OF THUNDERSTORMS...POSSIBLY
SEVERE WITH HEAVY RAIN. LOW NEAR 65.
GFK/FAR...A 40 PERCENT CHANCE OF THUNDERSTORMS. LOW OF 65 TO 70.
ROX/TVF/BJI...A 40 PERCENT CHANCE OF THUNDERSTORMS. LOW OF 65 TO 70.
DTL/FFM...A 30 PERCENT CHANCE OF THUNDERSTORMS. LOW IN THE UPPER 60S.

GSF

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 7:02 PM CDT	Severe Thunderstorm Warning	FGF	Sargent	28 min
Jul 26, 3:47 PM CDT	Tornado Warning	FGF	Cass	28 min
Jul 26, 4:19 PM CDT	Tornado Warning	FGF	Cass	26 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 1997 Every 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.