Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 87, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 21, 1999, 1:47 PM CDT for Richland County, North Dakota. It was in force for 33 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
- Jun 21, 1999, 1:47 PM CDT (18:47 UTC)
- Expired
- Jun 21, 1999, 2:20 PM CDT
- In force
- 33 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Richland County, ND
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 21, 1:55 PM CDT | Hail 1 | Fairmount, 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, 6.8 hours before the alert went out and 189 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 3 hours 22 minutes earlier.
Area forecast discussion, Jun 21, 10:25 AM CDT, 3 hours 22 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
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 11:40 AM CDT | Severe Thunderstorm Warning | FGF | Sargent | 35 min |
| Jun 21, 12:14 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 31 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.