Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 40, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 21, 1987, 8:38 PM CDT for Norman County, Polk County, Minnesota; Traill County, North Dakota. It was in force for 62 min.
The area
The counties it named.
The facts
- Issued
- Jul 21, 1987, 8:38 PM CDT (01:38 UTC)
- Expired
- Jul 21, 1987, 9:40 PM CDT
- In force
- 62 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
Counties Norman County, MN, Polk County, MN, Traill County, ND
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 1.6 hours before the alert went out and 277 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
- 1603 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 220138 SVRFAR NDC097-MNC107-119-220240- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FARGO ND 838 PM CDT TUE JUL 21 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 940 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EAST CENTRAL NORTH DAKOTA...EASTERN TRAILL NORTHWEST MINNESOTA...NORTHERN NORMAN AND SOUTHERN POLK INCLUDING SHELLY AND CROOKSTON. AT 815 PM CDT 66 MPH WINDS WERE REPORTED IN MAYVILLE NORTH DAKOTA. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS OF 58 MPH AND/OR HAIL 3/4 INCH OR LARGER...DEADLY LIGHTNING... AND HEAVY RAINS THAT CAN QUICKLY FLOOD A LOW LYING AREA. REMEMBER...SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ON THE LOOKOUT. IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A PLACE OF SAFETY IMMEDIATELY. REPORT ALL SEVERE WEATHER TO YOUR LOCAL LAW ENFORCEMENT AGENCY AFTER THE STORM PASSES. VOELKER
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.
In the hours before
Special weather statement, Jul 21, 3:38 PM CDT, 5 hours before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE FARGO ND 335 PM CDT TUE JUL 21 1987 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT THIS TUESDAY EVENING FOR A LARGE PART OF NORTH DAKOTA AND A PART OF NORTHWEST MINNESOTA... AT 325 PM CDT...A PAIR OF INTENSE THUNDERSTORMS WERE LOCATED 30 MILES AND 50 MILES NORTHWEST OF JAMESTOWN NORTH DAKOTA OR NEAR THE TOWNS OF NEW ROCKFORD AND CARRINGTON. THESE THUNDERSTORMS WERE MOVING TO THE EAST AT 40 MILES AN HOUR AND WILL MOVE INTO GRIGGS AND SOUTHERN NELSON COUNTIES BY 425 PM CDT. PERSONS LIVING IN THESE AREAS...ESPECIALLY THE TOWNS OF COOPERSTOWN...HANNAFORD...AND DAZEY SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND SHOULD BE PREPARED TO SEEK SHELTER IF NECESSARY. ALSO AT 325 PM CDT...SCATTERED SHOWERS AND THUNDERSTORMS...SOME WITH HEAVY RAIN...WERE LOCATED OVER NORTHEAST AND CENTRAL NORTH DAKOTA. THESE SHOWERS AND THUNDERSTORMS W(ERE ALSO MOVING TO THE EAST AT 40 MILES AN HOUR. MB
Local storm report, Jul 21, 8:18 PM CDT, 20 minutes before
STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
800PM CDT WED JUL 21 1987
TIME EVENT
502 PM CDT SPOTTER IN HOPE NORTH DAKOTA IN STEELE COUNTY REPORTED HEAVY
RAIN AND HAIL UP TO 2 INCHES.
505 PM CDT SPOTTER REPORTED FUNNEL CLOUD 10 MILES WEST OF HOPE NORTH
DAKOTA IN STEELE COUNTY.
505 PM CDT SPOTTER REPORTED MARBLE-GOLFBALL SIZED HAIL 4 AND 9 MILES
WEST OF COOPERSTOWN NORTH DAKOTA IN GRIGGS COUNTY.
530 PM CDT GOLFBALL TO BASEBALL SIZE HAIL AT CLIFFORD NORTH DAKOTA
IN TRAILL COUNTY BY LAW ENFORCEMENT.
555 PM CDT STATE RADIO RELAYS LAW ENFORCEMENT REPORT OF TORNADO
TOUCHDOWN AT BLANCHARD NORTH DAKOTA IN TRAIL COUNTY.
.
620 PM CDT 1 MILES WEST, 11/2 MILES NORTH OF PILLSBURY NORTH DAKOTA
SPOTTER REPORTED 1 INCH OF RAIN IN 15 MINUTES AND GOLFBALL
SIZE HAIL...BARNES COUNTY
VOELKERLocal storm report, Jul 21, 8:31 PM CDT, 7 minutes before
STORM REPORTS...CORRECTED FOR DAY
NATIONAL WEATHER SERVICE FARGO ND
800PM CDT TUE JUL 21 1987
TIME EVENT
502 PM CDT SPOTTER IN HOPE NORTH DAKOTA IN STEELE COUNTY REPORTED HEAVY
RAIN AND HAIL UP TO 2 INCHES.
505 PM CDT SPOTTER REPORTED FUNNEL CLOUD 10 MILES WEST OF HOPE NORTH
DAKOTA IN STEELE COUNTY.
505 PM CDT SPOTTER REPORTED MARBLE-GOLFBALL SIZED HAIL 4 AND 9 MILES
WEST OF COOPERSTOWN NORTH DAKOTA IN GRIGGS COUNTY.
530 PM CDT GOLFBALL TO BASEBALL SIZE HAIL AT CLIFFORD NORTH DAKOTA
IN TRAILL COUNTY BY LAW ENFORCEMENT.
555 PM CDT STATE RADIO RELAYS LAW ENFORCEMENT REPORT OF TORNADO
TOUCHDOWN AT BLANCHARD NORTH DAKOTA IN TRAIL COUNTY.
.
620 PM CDT 1 MILES WEST, 11/2 MILES NORTH OF PILLSBURY NORTH DAKOTA
SPOTTER REPORTED 1 INCH OF RAIN IN 15 MINUTES AND GOLFBALL
SIZE HAIL...BARNES COUNTY
VOELKERThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:02 PM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 58 min |
| Jul 21, 7:58 PM CDT | Tornado Warning | FGF | Becker, Clay, Mahnomen, Otter Tail | 62 min |
| Jul 21, 8:45 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater | 60 min |
| Jul 21, 9:00 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Hubbard, Wadena | 60 min |
| Jul 21, 11:26 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 49 min |
| Jul 22, 12:15 AM CDT | Severe Thunderstorm Warning | FGF | Mahnomen, Norman | 50 min |
| Jul 22, 1:21 AM CDT | Severe Thunderstorm Warning | FGF | Becker, Mahnomen, Norman | 54 min |
| Jul 22, 1:30 AM CDT | Severe Thunderstorm Warning | FGF | Clearwater | 75 min |
| Jul 22, 1:53 AM CDT | Severe Thunderstorm Warning | FGF | Norman | 52 min |
| Jul 22, 1:53 AM CDT | Severe Thunderstorm Warning | FGF | Clay | 52 min |
| Jul 21, 7:14 PM CDT | Tornado Warning | FGF | Nelson | 61 min |
| Jul 21, 7:41 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Steele | 49 min |
| Jul 21, 7:41 PM CDT | Severe Thunderstorm Warning | FGF | Griggs | 49 min |
| Jul 21, 8:49 PM CDT | Severe Thunderstorm Warning | FGF | Nelson | 56 min |
| Jul 21, 9:50 PM CDT | Severe Thunderstorm Warning | FGF | Griggs, Nelson, Steele | 55 min |
| Jul 21, 9:50 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Traill | 55 min |
| Jul 21, 10:44 PM CDT | Severe Thunderstorm Warning | FGF | Griggs, Steele, Traill | 61 min |
| Jul 21, 11:53 PM CDT | Severe Thunderstorm Warning | FGF | Steele, Traill | 52 min |
| Jul 21, 11:53 PM CDT | Severe Thunderstorm Warning | FGF | Griggs | 52 min |
| Jul 22, 12:47 AM CDT | Severe Thunderstorm Warning | FGF | Steele, Traill | 58 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1987Severe Thunderstorm Warnings in North Dakota, 1987Every severe thunderstorm warning in 1987
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.