Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 85, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 21, 1999, 11:40 AM CDT for Sargent County, North Dakota. 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
- Jun 21, 1999, 11:40 AM CDT (16:40 UTC)
- Expired
- Jun 21, 1999, 12:15 PM CDT
- In force
- 35 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 16:43 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 |
|---|---|---|---|
| Jun 21, 11:40 AM CDT | Hail 0.75 | Cogswell, ND | |
| Jun 21, 11:55 AM CDT | Hail 0.75 | Cogswell, ND | |
| Jun 21, 12:10 PM CDT | Hail 0.75 | Forman, ND |
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
Aberdeen, SD (KABR), launched 12:00Z, 4.7 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
- 1247 J/kg
- Mixed-layer CIN
- -275 J/kg
- Mixed-layer LCL
- 827 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 143 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
142 WUUS1 KFAR 211639 RRA SVRFAR NDC081-211715- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 1140 AM CDT MON JUN 21 1999 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SARGENT COUNTY IN SOUTHEASTERN NORTH DAKOTA * UNTIL 1215 PM CDT * AT 1139 AM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 56 MILES SOUTH OF VALLEY CITY OR 6 MILES SOUTH OF STIRUM... MOVING EAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... FORMAN AT 1208 PM CDT GWINNER AT 1214 PM CDT DAMAGING WIND...LARGE HAIL...DEADLY LIGHTNING AND TORNADOES ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. SEEK SHELTER IN A REINFORCED BUILDING IMMEDIATELY. TURNER
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 Jun 21, 10:25 AM CDT, 1 hour 15 minutes earlier.
Area forecast discussion, Jun 21, 10:25 AM CDT, 1 hour 15 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 1025 AM CDT MON JUN 21 1999 FORECAST CHALLENGE FOR UPDATE CONCERNS TSRA THREAT AND TEMPS. MCS OVR S CENTRAL ND ASSOCIATED WITH WELL DIFINED VORT MAX FROM IR AND KMVX-88D REFLECTIVITY LOOP CENTERED JUST SE OF DVL TRACKING ENE...WAA AND MODERATE DEEP SOUTHERLY FLOW ADVECTING MOIST AIR NORTHWARD. COLDEST TOPS OF MCS OVR S CENTRAL ND GRADUALLY SHRINKING WITH STRONGEST CELLS SW OF JMS IN ZONE OF GREATEST INSTABILITY. SFC MAP INDICATED SFC BOUNDARY ALONG ND/SD BORDER SOUTH OF THIS AREA. OUTFLOW BOUNDARY FROM MCS GENERATED A LINE OF TSRA CURRENTLY FROM EXT SE ND INTO WEST CENTRAL/NORTHWEST MN. CELLS HAVE BEEN WEAKENING WITH AREA PUSHING INTO LESS UNSTABLE AIRMASS. MORE GENERAL RAIN WITH EMBEDDED TSRA OVR SE ND. FROM 12Z RUC VORT WEAKENS AS IT TRACKS E-NE. FROM CURRENT RADAR TRENDS FAVORED AREA FOR CONTINUED PCPN LOOKS TO BE AHEAD AND SOUTH OF VORT PATH WITH GENERAL WEAKENING AND MORE WIDELY SCT COVERAGE INTO THE AFTERNOON. LOCALIZED BOUNDARIES WILL ALSO NEED TO BE MONITORED LATER THIS AFTERNOON IN EASTERN PTN OF FA FOR LATER DEVELOPMENT. AS FAR AS TEMPS LOWEST/THICKEST CLD COVER OVR SE ND WITH GENERALLY MID AND UPPER LEVEL CLDS ELSEWHERE. CURRENT TEMPS AROUND 70 AND WITH CONTINUED WAA WILL NOT TAKE ALOT OF SUN TO REACH FCST MAX TEMPS. AS S-W SHIFTS EAST INCREASING SUBS SHOULD ALLOW PARTIAL SUN LATER THIS AFTERNOON SO NO BIG CHANGES AS FAR AS TEMPS EXPECTED. .FGF...NONE. VOELKER
In the hours before
Special weather statement, Jun 21, 6:44 AM CDT, 4 hours 56 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052-053-211400- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 644 AM CDT MON JUN 21 1999 ...NO SEVERE WEATHER EXPECTED TODAY OR TONIGHT... SYNOPSIS...A WARM AND HUMID AIRMASS WILL REMAIN IN PLACE OVER EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA TODAY AND TONIGHT. AN UPPER LEVEL DISTURBANCE WILL MOVE EAST THROUGH EASTERN NORTH DAKOTA THIS MORNING AND INTO NORTHWEST MINNESOTA THIS AFTERNOON. A COMPLEX OF SHOWERS AND THUNDERSTORMS WILL MOVE THROUGH EAST CENTRAL AND SOUTHEAST NORTH DAKOTA THIS MORNING AND INTO NORTHWEST MINNESOTA DURING THE MIDDAY AND AFTERNOON. THESE THUNDERSTORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN AND GUSTY WINDS TO 40 MPH...BUT ARE NOT EXPECTED TO BECOME SEVERE. RIDDLE
Special weather statement, Jun 21, 6:44 AM CDT, 4 hours 56 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052-053-211400- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 644 AM CDT MON JUN 21 1999 ...NO SEVERE WEATHER EXPECTED TODAY OR TONIGHT... SYNOPSIS...A WARM AND HUMID AIRMASS WILL REMAIN IN PLACE OVER EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA TODAY AND TONIGHT. AN UPPER LEVEL DISTURBANCE WILL MOVE EAST THROUGH EASTERN NORTH DAKOTA THIS MORNING AND INTO NORTHWEST MINNESOTA THIS AFTERNOON. A COMPLEX OF SHOWERS AND THUNDERSTORMS WILL MOVE THROUGH EAST CENTRAL AND SOUTHEAST NORTH DAKOTA THIS MORNING AND INTO NORTHWEST MINNESOTA DURING THE MIDDAY AND AFTERNOON. THESE THUNDERSTORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN AND GUSTY WINDS TO 40 MPH...BUT ARE NOT EXPECTED TO BECOME SEVERE. RIDDLE
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 12:14 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 31 min |
| Jun 21, 1:47 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 33 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1999Every severe thunderstorm warning in 1999
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.