Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 13, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at May 9, 1999, 6:39 PM CDT for Richland County, North Dakota. It was in force for 31 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
- May 9, 1999, 6:39 PM CDT (23:39 UTC)
- Expired
- May 9, 1999, 7:10 PM CDT
- In force
- 31 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Richland County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 143 km from the middle of the area, began a volume at 23:39 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 |
|---|---|---|---|
| May 9, 6:45 PM CDT | Hail 0.75 | Lidgerwood, 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, 11.7 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 890 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KFAR 092340 RRA SVRFAR NDC077-100010- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 639 PM CDT SUN MAY 9 1999 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHWESTERN RICHLAND COUNTY IN SOUTHEASTERN NORTH DAKOTA * UNTIL 710 PM CDT * AT 637 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 38 MILES SOUTHWEST OF WAHPETON OR 11 MILES SOUTH OF LIDGERWOOD... MOVING NORTH AT 45 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... LIDGERWOOD AT 651 PM CDT WYNDMERE AT 708 PM CDT REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED WARNING. RA
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 May 9, 2:30 PM CDT, 4 hours 9 minutes earlier.
Area forecast discussion, May 9, 2:30 PM CDT, 4 hours 9 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 230 PM CDT SUN MAY 9 1999 ...FORECAST CONCERNS...HEAVY RAIN AND TSRA POTENTIAL... .CURRENT SYNOPTIC OVERVIEW... SURFACE ANALYSIS SHOWS LOW PRESSURE SYSTEM TAKING SHAPE IN NORTHEAST COLORADO...WITH INVERTED TROUGH EXTENDING INTO CENTRAL MONTANA. 5H RIDGE OVER CWA...WITH H7 WAA AND UPPER LEVEL DIVERGENCE FEEDING SHOWER AND TSRA ACTIVITY IN CWA. .SHORT TERM... MODELS DIFFER WITH TIMING OF PRECIP AS ETA BRINGS IT INTO CWA THE FASTEST. WILL GO WITH THE ETA AS IT WAS THE ONLY MODEL TO PICK UP THE CURRENT PRECIPITATION. LOW LEVEL JET OF 50 KT TO SURGE H850 WARMFRONT NORTHWARD INTO CWA AFTER 6Z. MOISTURE TRANSPORT ALSO IMPRESSIVE FROM H850 TO H7...ESPECIALLY AFTER 6Z FROM RRV WEST. WITH THETA E RIDGE OVER RRV SPELL GOOD BOUT OF ELEVATED CONVECTIVE RAINS TONIGHT. WEAK SHORTWAVE AT H5 WILL ALSO ADD MORE LIFT TO MOISTURE LADEN ATMOSPHERE AS PRECIPITABLE WATERS FROM 1 TO 1.2 INCHES PROGGED TO COVER CWA BY 12Z MONDAY. THUNDERSTORM POTENTIAL THERE AS WELL WITH 850 DEWPOINTS REACHING +10 C FROM GFK SOUTH BY 12Z. A FEW RENEGADE SEVERE CELLS CAN/T BE RULED OUT IN SOUTH WITH RAPIDLY SURGING H850 WARMFRONT...850-500 LI/S OF -1...AND K INDEX/S OF 32. .LONG TERM...BEST MOISTURE TRANPORT SHIFTS WEST OF RRV MONDAY/MONDAY NIGHT AS SURFACE LOW SLOWLY MOVES NORTHEASTWARD. INVERTED TROUGH AT SURFACE WILL BE OVER RRV ON MONDAY...ALONG WITH AMPLE MOISTURE WILL SPELL ANOTHER WET DAY. CONVECTION SHOULD BECOME MORE SURFACE BASED MONDAY AS THE SOUTHERN CWA GETS INTO WARM SECTOR WITH LI/S OF -2...AND CAPE/S AROUND 1000 J/KG NEAR FAR. UPPER LOW TO CLOSE OFF OVER NODAK BY TUESDAY MORNING...WITH OCCLUDED FRONT NEAR RRV AND DEEP CYCLONIC FLOW WILL SPELL INSTABILITY TYPE SHOWERS. .EXTENDED... REMAINDER OF MEDIUM RANGE MODELS HAVE COME INTO AGREEMENT WITH YESTERDAYS CANADIAN GLOBAL AS NEGATIVE PHASE OF PNA AND POSITIVE NAO PERSIST THROUGH PERIOD. WEST-SOUTHWEST FLOW ALOFT AHEAD OF WESTERN TROUGH SUGGESTS UNSETTLED PATTERN WITH PERIODIC BOUTS OF SHOWERS AND PERHAPS SOME EMBEDDED CONVECTION ESPECIALLY IN THE SOUTH. .FGF...NONE. KELLENBENZ/BERG
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 2:38 PM CDT | Severe Thunderstorm Warning | FGF | Barnes | 32 min |
| May 9, 5:17 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 33 min |
| May 9, 5:51 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 34 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.