SPC Apr 20, 2025 2000 UTC Day 1 Convective Outlook
SPC 2000Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0253 PM CDT Sun Apr 20 2025 Valid 202000Z - 211200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS NORTHERN ARKANSAS AND MISSOURI VICINITY... ...SUMMARY... Severe thunderstorms are expected today across parts of the ArkLaTex into the Ozarks and mid Mississippi Valley, mainly this afternoon and evening. The best corridor for tornadoes (some of which could be strong) and scattered to numerous damaging winds should exist from central/northern Arkansas into Missouri. ...20z Update.. A broken line of thunderstorm activity continues near the surface low
Special Weather Statement issued April 20 at 4:32PM MDT by NWS Great Falls MT
At 431 PM MDT, Doppler radar was tracking strong thunderstorms, one of which has produced a landspout, along a line extending from 9 miles east of Parker School to 13 miles northwest of Choteau. Movement was northeast at 25 mph. HAZARD...Landspouts, wind gusts up to 40 mph, and half inch hail. SOURCE...Radar indicated. IMPACT...Minor damage to outdoor objects is possible. Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Azure, Parker School, Agency, St. Pierre, Rocky Boy, Tiber Dam, Big Sandy, Laredo, Brady, The Knees, Bynum, Sangrey, Kenilworth, Conrad, Boneau, Box Elder, and Lloyd.
Red Flag Warning issued April 20 at 2:26PM CDT until April 21 at 9:00PM CDT by NWS North Platte NE
...CRITICAL FIRE WEATHER CONDITIONS LIKELY MONDAY... The National Weather Service in North Platte has issued a Red Flag Warning for low relative humidity and gusty winds, which is in effect from 1 PM CDT /noon MDT/ to 9 PM CDT /8 PM MDT/ Monday. * AFFECTED AREA...Fire Weather Zone 204 Eastern Panhandle/Crescent Lake NWR, Fire Weather Zone 206 Sandhills/Valentine NWR/Nebraska National Forest, Fire Weather Zone 209 Loup Rivers Basin, Fire Weather Zone 210 Frenchman Basin and Fire Weather Zone 219 Loess Plains. * TIMING...Monday afternoon through mid evening. * WINDS...Southwest 15 to 25 mph with gusts up to 35 mph.
Frost Advisory issued April 20 at 2:26PM CDT until April 21 at 8:00AM CDT by NWS Omaha/Valley NE
* WHAT...Temperatures as low as 29 will result in frost formation. * WHERE...Gage, Jefferson, Lancaster, Saline, and Seward Counties. * WHEN...From 2 AM to 8 AM CDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Flood Warning issued April 20 at 12:10PM CDT until May 1 at 5:48PM CDT by NWS Jackson MS
...The Flood Warning is extended for the following rivers in Louisiana...Mississippi...Arkansas... Mississippi River At Vicksburg affecting Warren, Madison, Claiborne, Jefferson and Tensas Counties. Mississippi River At Natchez affecting Concordia, Adams and Wilkinson Counties. Mississippi River Near Greenville affecting Washington, Chicot, East Carroll and Issaquena Counties. Mississippi River Near Arkansas City affecting Desha, Bolivar, Chicot and Washington Counties. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Mississippi River near Arkansas City. * WHEN...Until Thursday, May 01. * IMPACTS...At 42.0 feet, Water approaches the first structure at the Donaldson Point Hunting Club in Bolivar County. * ADDITIONAL DETAILS... -
Flood Advisory issued April 20 at 9:47AM EDT by NWS Marquette MI
...The Flood Advisory is extended for the following rivers in Michigan... Sturgeon River near Alston affecting Houghton and Baraga Counties. ...The Flood Advisory continues for the following rivers in Michigan... Sturgeon River near Chassell affecting Houghton and Baraga Counties. .Snow melt and increased reservoir releases will cause the river flows to become high. Expect minor flooding downstream from the dam. * WHAT...Elevated river levels caused by snowmelt continue. * WHERE...Sturgeon River near Chassell. * WHEN...Until further notice. * IMPACTS...At 10.5 feet, The river begins to overflow onto Sturgeon River Road...Rajala Road...and Aho Road * ADDITIONAL DETAILS... - At 10:00 AM
Flood Advisory issued April 20 at 9:47AM EDT until April 24 at 2:00PM EDT by NWS Marquette MI
...The Flood Advisory is extended for the following rivers in Michigan... Sturgeon River near Alston affecting Houghton and Baraga Counties. ...The Flood Advisory continues for the following rivers in Michigan... Sturgeon River near Chassell affecting Houghton and Baraga Counties. .Snow melt and increased reservoir releases will cause the river flows to become high. Expect minor flooding downstream from the dam. * WHAT...Elevated river levels caused by snowmelt continue. * WHERE...Sturgeon River near Alston. * WHEN...Until early Thursday afternoon. * IMPACTS...At 8.0 feet, Homes and structures along the low lying areas and numerous roads become impacted by flood water. In Houghton
Flood Warning issued April 20 at 9:59AM CDT until April 22 at 1:00PM CDT by NWS Memphis TN
...The Flood Warning continues for the following rivers in Mississippi... Coldwater River at Marks For the Coldwater River...including Sarah, Marks...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. This approaches the flood of record. * WHERE...Coldwater River at Marks. * WHEN...Until early Tuesday afternoon. * IMPACTS...At 39.0 feet, Low-lying farmland is flooded in northern Quitman County. * ADDITIONAL DETAILS... - At 9:00 AM CDT Sunday the stage was 39.2 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 AM CDT Sunday was 39.5 feet. - Forecast...The River will fall below
Flood Warning issued April 20 at 9:40AM CDT until April 29 at 1:00AM CDT by NWS Memphis TN
...The Flood Warning continues for the following rivers in Mississippi...Arkansas...Tennessee...Missouri... Mississippi River at Helena Mississippi River at Memphis Mississippi River at Tunica Mhoon Landing Mississippi River Above Tiptonville Mississippi River at Caruthersville Mississippi River at Osceola For the Lower Mississippi River...including Tiptonville, Caruthersville, Osceola, Memphis, Tunica Mhoon Landing, Helena... Major flooding is forecast. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Mississippi River at Tunica Mhoon Landing. * WHEN...Until Tuesday, April 29. * IMPACTS...At 38.0 feet, Water is beginning to go over Loggerhead Lane going into Bordeaux Camp. Drum Cove is flooding, and Buffalo Drive is mostly
Flood Warning issued April 20 at 9:40AM CDT until April 26 at 5:00PM CDT by NWS Memphis TN
...The Flood Warning continues for the following rivers in Mississippi...Arkansas...Tennessee...Missouri... Mississippi River at Helena Mississippi River at Memphis Mississippi River at Tunica Mhoon Landing Mississippi River Above Tiptonville Mississippi River at Caruthersville Mississippi River at Osceola For the Lower Mississippi River...including Tiptonville, Caruthersville, Osceola, Memphis, Tunica Mhoon Landing, Helena... Major flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Helena. * WHEN...Until Saturday, April 26. * IMPACTS...At 47.0 feet, In Mississippi, almost all of Island Number 67 is covered by water. * ADDITIONAL DETAILS... - At 8:00 AM CDT Sunday the stage