Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 146, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2002, 3:36 AM CDT for Sargent County, North Dakota. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2002, 3:36 AM CDT (08:36 UTC)
- Expired
- Jul 31, 2002, 4:15 AM CDT
- In force
- 39 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Sargent County, ND
The radar
The Aberdeen radar (KABR), 89 km from the middle of the area, began a volume at 08:40 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 8.6 hours before the alert went out and 142 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
- 1470 J/kg
- Mixed-layer CIN
- -209 J/kg
- Mixed-layer LCL
- 1589 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
323 WUUS53 KFGF 310836 SVRFAR NDC081-310915- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 336 AM CDT WED JUL 31 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN SARGENT COUNTY IN SOUTHEAST NORTH DAKOTA. * UNTIL 415 AM CDT. * AT 331 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES SOUTHWEST OF STRAUBVILLE...OR ABOUT 68 MILES SOUTH OF VALLEY CITY...MOVEMENT WAS TO THE EAST AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... STRAUBVILLE AT 340 AM... BRAMPTON AT 350 AM... FORMAN AT 400 AM AND RUTLAND AT 410 AM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4615 9798 4596 9798 4595 9728 4619 9730 04 NNNN
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 31, 3:15 AM CDT, 21 minutes earlier.
Area forecast discussion, Jul 31, 3:15 AM CDT, 21 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 315 AM CDT WED JUL 31 2002 FORECAST CHALLENGE CONCERNS EARLY TSRA THREAT AND TEMPERATURES. MODELS IN FAIR AGREEMENT THROUGH PERIOD ALTHOUGH PREFERRED SFC FEATURES FROM ETA EARLY. MAIN CONCERN TODAY WILL THREAT FOR MAINLY AFTERNOON AND EVENING SEVERE TSRA. SFC LOW PRESSURE STILL FAIRLY UNORGANIZED EARLY THIS MORNING HOWEVER FEATURE GAINS BETTER DEFINITION AND SHIFTS EAST TO WESTERN FA BY MID AFTERNOON AND ACROSS FORECAST AREA DURING LATE AFTERNOON EARLY EVENING HOURS. IN THE NEAR TERM SEVERAL CLUSTERS OF TSRA FROM KMVX/KBIS 88S WILL PROPAGATE EAST THROUGH FA EARLY THIS AM BEFORE GRADUALLY DIMINISHING. WILL LIKELY SEE A BREAK FROM LATE AM INTO MID AFTERNOON. CONVECTIVE DEBRIS CLOUDS WILL HAVE SOME IMPACT ON TEMPS HOWEVER DO EXPECT A GOOD DOSE OF AFTERNOON SOLAR TO AID IN DESTABILIZATION. AS SFC LOW BECOMES BETTER DEFINED INCREASING SOUTHERLY FLOW WILL PROVIDE GOOD LOW LEVEL MOISTURE FLUX INTO AREA. AT THIS TIME FAVORED AREA FOR INITIATION OF AFTERNOON CONVECTION LOOKS TO BE ACROSS THE NORTH WITH LESS CAPPING AND ON NOSE OF UPPER JET. AS SIGNIFICANT SHORTWAVE APPROACHES REGION GOOD MID LEVEL COOLING WILL PUT WHOLE AREA UNDER GUN AS CAP ERODES WITH EXCEPTION OF FAR NW BEHIND FRONT. SVR THREAT WILL SHIFT EAST OF RIVER THIS EVENING AND BASED ON FROPA SHOULD EXIT FA BY MIDNIGHT. STRONG COLD ADVECTION DIVES FROM NW TO SE ACROSS FA OVERNIGHT. WE SHOULD THEN SEE MUCH COOLER TEMPERATURES BUT RAIN FREE CONDITIONS AS SFC AND MID LEVEL RIDGING TAKES CONTROL. RETURN FLOW SETS UP AHEAD OF NEXT WAVE LATE FRIDAY WITH OUR NEXT CHANCE OF PCPN STILL ON TRACK FOR FRIDAY NIGHT/SAT. NO CHANGES PLANNED TO EXTENDED. .FGF...NONE. VOELKER
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 4:13 AM CDT | Severe Thunderstorm Warning | FGF | Richland, Sargent | 47 min |
| Jul 31, 4:59 AM CDT | Severe Thunderstorm Warning | FGF | Richland | 31 min |
| Jul 31, 6:13 PM CDT | Tornado Warning | FGF | Benson | 32 min |
| Jul 31, 6:18 PM CDT | Tornado Warning | FGF | Ramsey | 42 min |
| Jul 31, 6:46 PM CDT | Severe Thunderstorm Warning | FGF | Benson | 44 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 2002Every severe thunderstorm warning in 2002
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.